Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall
Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD)...
Ausführliche Beschreibung
Autor*in: |
Darshana, Patekar [verfasserIn] Chowdary, Jasti S. [verfasserIn] Gnanaseelan, C. [verfasserIn] Parekh, Anant [verfasserIn] Srinivas, G. [verfasserIn] |
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E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2019 |
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Schlagwörter: |
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Übergeordnetes Werk: |
Enthalten in: Climate dynamics - Berlin : Springer, 1986, 54(2019), 3-4 vom: 17. Dez., Seite 1761-1777 |
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Übergeordnetes Werk: |
volume:54 ; year:2019 ; number:3-4 ; day:17 ; month:12 ; pages:1761-1777 |
Links: |
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DOI / URN: |
10.1007/s00382-019-05085-5 |
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Katalog-ID: |
SPR004687566 |
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520 | |a Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. | ||
650 | 4 | |a Western North Pacific |7 (dpeaa)DE-He213 | |
650 | 4 | |a Indian summer monsoon |7 (dpeaa)DE-He213 | |
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650 | 4 | |a El Niño Southern Oscillation |7 (dpeaa)DE-He213 | |
700 | 1 | |a Chowdary, Jasti S. |e verfasserin |4 aut | |
700 | 1 | |a Gnanaseelan, C. |e verfasserin |4 aut | |
700 | 1 | |a Parekh, Anant |e verfasserin |4 aut | |
700 | 1 | |a Srinivas, G. |e verfasserin |4 aut | |
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10.1007/s00382-019-05085-5 doi (DE-627)SPR004687566 (SPR)s00382-019-05085-5-e DE-627 ger DE-627 rakwb eng 550 ASE 38.80 bkl Darshana, Patekar verfasserin aut Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. Western North Pacific (dpeaa)DE-He213 Indian summer monsoon (dpeaa)DE-He213 Tropical Indian Ocean (dpeaa)DE-He213 Pacific–Japan pattern (dpeaa)DE-He213 El Niño Southern Oscillation (dpeaa)DE-He213 Chowdary, Jasti S. verfasserin aut Gnanaseelan, C. verfasserin aut Parekh, Anant verfasserin aut Srinivas, G. verfasserin aut Enthalten in Climate dynamics Berlin : Springer, 1986 54(2019), 3-4 vom: 17. Dez., Seite 1761-1777 (DE-627)268128561 (DE-600)1471747-5 1432-0894 nnns volume:54 year:2019 number:3-4 day:17 month:12 pages:1761-1777 https://dx.doi.org/10.1007/s00382-019-05085-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-GGO SSG-OPC-ASE GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_612 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.80 ASE AR 54 2019 3-4 17 12 1761-1777 |
spelling |
10.1007/s00382-019-05085-5 doi (DE-627)SPR004687566 (SPR)s00382-019-05085-5-e DE-627 ger DE-627 rakwb eng 550 ASE 38.80 bkl Darshana, Patekar verfasserin aut Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. Western North Pacific (dpeaa)DE-He213 Indian summer monsoon (dpeaa)DE-He213 Tropical Indian Ocean (dpeaa)DE-He213 Pacific–Japan pattern (dpeaa)DE-He213 El Niño Southern Oscillation (dpeaa)DE-He213 Chowdary, Jasti S. verfasserin aut Gnanaseelan, C. verfasserin aut Parekh, Anant verfasserin aut Srinivas, G. verfasserin aut Enthalten in Climate dynamics Berlin : Springer, 1986 54(2019), 3-4 vom: 17. Dez., Seite 1761-1777 (DE-627)268128561 (DE-600)1471747-5 1432-0894 nnns volume:54 year:2019 number:3-4 day:17 month:12 pages:1761-1777 https://dx.doi.org/10.1007/s00382-019-05085-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-GGO SSG-OPC-ASE GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_612 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.80 ASE AR 54 2019 3-4 17 12 1761-1777 |
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10.1007/s00382-019-05085-5 doi (DE-627)SPR004687566 (SPR)s00382-019-05085-5-e DE-627 ger DE-627 rakwb eng 550 ASE 38.80 bkl Darshana, Patekar verfasserin aut Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. Western North Pacific (dpeaa)DE-He213 Indian summer monsoon (dpeaa)DE-He213 Tropical Indian Ocean (dpeaa)DE-He213 Pacific–Japan pattern (dpeaa)DE-He213 El Niño Southern Oscillation (dpeaa)DE-He213 Chowdary, Jasti S. verfasserin aut Gnanaseelan, C. verfasserin aut Parekh, Anant verfasserin aut Srinivas, G. verfasserin aut Enthalten in Climate dynamics Berlin : Springer, 1986 54(2019), 3-4 vom: 17. Dez., Seite 1761-1777 (DE-627)268128561 (DE-600)1471747-5 1432-0894 nnns volume:54 year:2019 number:3-4 day:17 month:12 pages:1761-1777 https://dx.doi.org/10.1007/s00382-019-05085-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-GGO SSG-OPC-ASE GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_612 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.80 ASE AR 54 2019 3-4 17 12 1761-1777 |
allfieldsGer |
10.1007/s00382-019-05085-5 doi (DE-627)SPR004687566 (SPR)s00382-019-05085-5-e DE-627 ger DE-627 rakwb eng 550 ASE 38.80 bkl Darshana, Patekar verfasserin aut Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. Western North Pacific (dpeaa)DE-He213 Indian summer monsoon (dpeaa)DE-He213 Tropical Indian Ocean (dpeaa)DE-He213 Pacific–Japan pattern (dpeaa)DE-He213 El Niño Southern Oscillation (dpeaa)DE-He213 Chowdary, Jasti S. verfasserin aut Gnanaseelan, C. verfasserin aut Parekh, Anant verfasserin aut Srinivas, G. verfasserin aut Enthalten in Climate dynamics Berlin : Springer, 1986 54(2019), 3-4 vom: 17. Dez., Seite 1761-1777 (DE-627)268128561 (DE-600)1471747-5 1432-0894 nnns volume:54 year:2019 number:3-4 day:17 month:12 pages:1761-1777 https://dx.doi.org/10.1007/s00382-019-05085-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-GGO SSG-OPC-ASE GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_612 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.80 ASE AR 54 2019 3-4 17 12 1761-1777 |
allfieldsSound |
10.1007/s00382-019-05085-5 doi (DE-627)SPR004687566 (SPR)s00382-019-05085-5-e DE-627 ger DE-627 rakwb eng 550 ASE 38.80 bkl Darshana, Patekar verfasserin aut Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. Western North Pacific (dpeaa)DE-He213 Indian summer monsoon (dpeaa)DE-He213 Tropical Indian Ocean (dpeaa)DE-He213 Pacific–Japan pattern (dpeaa)DE-He213 El Niño Southern Oscillation (dpeaa)DE-He213 Chowdary, Jasti S. verfasserin aut Gnanaseelan, C. verfasserin aut Parekh, Anant verfasserin aut Srinivas, G. verfasserin aut Enthalten in Climate dynamics Berlin : Springer, 1986 54(2019), 3-4 vom: 17. Dez., Seite 1761-1777 (DE-627)268128561 (DE-600)1471747-5 1432-0894 nnns volume:54 year:2019 number:3-4 day:17 month:12 pages:1761-1777 https://dx.doi.org/10.1007/s00382-019-05085-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OPC-GGO SSG-OPC-ASE GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_206 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_612 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 38.80 ASE AR 54 2019 3-4 17 12 1761-1777 |
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Enthalten in Climate dynamics 54(2019), 3-4 vom: 17. Dez., Seite 1761-1777 volume:54 year:2019 number:3-4 day:17 month:12 pages:1761-1777 |
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Darshana, Patekar @@aut@@ Chowdary, Jasti S. @@aut@@ Gnanaseelan, C. @@aut@@ Parekh, Anant @@aut@@ Srinivas, G. @@aut@@ |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">SPR004687566</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20220110175111.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">201001s2019 xx |||||o 00| ||eng c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.1007/s00382-019-05085-5</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)SPR004687566</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(SPR)s00382-019-05085-5-e</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">550</subfield><subfield code="q">ASE</subfield></datafield><datafield tag="084" ind1=" " ind2=" "><subfield code="a">38.80</subfield><subfield code="2">bkl</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Darshana, Patekar</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2019</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. 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|
author |
Darshana, Patekar |
spellingShingle |
Darshana, Patekar ddc 550 bkl 38.80 misc Western North Pacific misc Indian summer monsoon misc Tropical Indian Ocean misc Pacific–Japan pattern misc El Niño Southern Oscillation Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall |
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550 ASE 38.80 bkl Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall Western North Pacific (dpeaa)DE-He213 Indian summer monsoon (dpeaa)DE-He213 Tropical Indian Ocean (dpeaa)DE-He213 Pacific–Japan pattern (dpeaa)DE-He213 El Niño Southern Oscillation (dpeaa)DE-He213 |
topic |
ddc 550 bkl 38.80 misc Western North Pacific misc Indian summer monsoon misc Tropical Indian Ocean misc Pacific–Japan pattern misc El Niño Southern Oscillation |
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ddc 550 bkl 38.80 misc Western North Pacific misc Indian summer monsoon misc Tropical Indian Ocean misc Pacific–Japan pattern misc El Niño Southern Oscillation |
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ddc 550 bkl 38.80 misc Western North Pacific misc Indian summer monsoon misc Tropical Indian Ocean misc Pacific–Japan pattern misc El Niño Southern Oscillation |
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title |
Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall |
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Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall |
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Darshana, Patekar |
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Climate dynamics |
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Darshana, Patekar Chowdary, Jasti S. Gnanaseelan, C. Parekh, Anant Srinivas, G. |
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interdecadal modulation of the indo-western pacific ocean capacitor mode and its influence on indian summer monsoon rainfall |
title_auth |
Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall |
abstract |
Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. |
abstractGer |
Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. |
abstract_unstemmed |
Abstract The present study investigates the interdecadal modulations of interannual variability in the Indo-western Pacific Ocean Capacitor (IPOC) mode and its influence on the Indian summer monsoon (ISM) rainfall during 1886–2014. The IPOC mode is extracted using singular value decomposition (SVD) analysis of tropical Indian Ocean (TIO) sea surface temperature (SST) and western North Pacific (WNP) 850 hPa relative vorticity anomalies during the boreal summer season (June to August; JJA). Analysis suggests that the IPOC mode induces a southwest-northeast dipole pattern in the Indian subcontinent rainfall with significant positive anomalies over the southern peninsular India and negative anomalies over the eastern parts of the Indo-Gangetic plains during the positive phase of IPOC. The 21-year sliding correlation coefficients between rainfall dipole index and leading principal component of SVD analysis (SVD-PC1) suggest that IPOC and ISM rainfall relationship exhibits significant interdecadal variability during the study period. The entire period has been divided into three distinct epochs as 1895–1926 (epoch-1), 1932–1972 (epoch-2) and 1976–2007 (epoch-3) based on 21-year sliding correlation. It is found that the IPOC mode strongly affect ISM rainfall in epoch-1 and epoch-3, whereas this relationship between the IPOC mode and ISM rainfall is inadequate in epoch-2 pertaining to the absence of the dipole rainfall pattern. The mechanisms responsible for such epochal changes in relationship between IPOC mode and ISM rainfall are discussed. In epoch-1 and epoch-3, anomalous TIO SST and the Pacific–Japan (PJ) pattern/WNP circulation both are well organized as part of the IPOC mode. However, in epoch-2 vigorous warm SSTs over the equatorial central Pacific and cyclonic circulation over the north Pacific accompanied by SST cooling around 40°N are noticed. The north Pacific cyclonic circulation accelerates the southwesterlies emerging from north-western flank of WNP anticyclone. On the other hand, positive SST anomalies and associated low-level convergence in central equatorial Pacific limit the extension of northeasterlies from the southern edge of WNP anticyclone to TIO. As a result, WNP anticyclone is squeezed/twisted between them, thereby weakening and shifting it northeastward. This in turn weakens the PJ mode and the inter-basin interaction of WNP circulation and TIO SSTs, causing disorganized IPOC pattern in epoch-2. |
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Interdecadal modulation of the Indo-western Pacific Ocean Capacitor mode and its influence on Indian summer monsoon rainfall |
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https://dx.doi.org/10.1007/s00382-019-05085-5 |
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score |
7.4005814 |