Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs
Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions....
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Wang, Pinya [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017 |
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| Rechteinformationen: |
Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Journal of geophysical research / D - Washington, DC : Union, 1984, 122(2017), 20 |
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| Übergeordnetes Werk: |
volume:122 ; year:2017 ; number:20 |
| Links: |
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| DOI / URN: |
10.1002/2017JD027180 |
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OLC1997849119 |
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| 520 | |a Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China | ||
| 540 | |a Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. | ||
| 650 | 4 | |a definition | |
| 650 | 4 | |a SST | |
| 650 | 4 | |a circulation | |
| 650 | 4 | |a heat waves | |
| 650 | 4 | |a variability | |
| 650 | 4 | |a Rossby waves | |
| 650 | 4 | |a Sea surface | |
| 650 | 4 | |a Surface temperatures | |
| 650 | 4 | |a Wave packets | |
| 650 | 4 | |a Dry land | |
| 650 | 4 | |a Maximum temperatures | |
| 650 | 4 | |a Wave trains | |
| 650 | 4 | |a Duration | |
| 650 | 4 | |a Variation | |
| 650 | 4 | |a Waves | |
| 650 | 4 | |a Climatology | |
| 650 | 4 | |a Modes | |
| 650 | 4 | |a Walker circulation | |
| 650 | 4 | |a Sea surface temperatures | |
| 650 | 4 | |a Pressure | |
| 650 | 4 | |a Diabatic heating | |
| 650 | 4 | |a Heat tolerance | |
| 650 | 4 | |a Atmospheric circulation | |
| 650 | 4 | |a Wave propagation | |
| 650 | 4 | |a Surface temperature | |
| 650 | 4 | |a Orthogonal functions | |
| 650 | 4 | |a Heating | |
| 650 | 4 | |a Regional climatology | |
| 650 | 4 | |a Heat | |
| 650 | 4 | |a Tropical environment | |
| 650 | 4 | |a Anomalies | |
| 650 | 4 | |a Sea surface temperature | |
| 650 | 4 | |a Heat waves | |
| 700 | 1 | |a Tang, Jianping |4 oth | |
| 700 | 1 | |a Sun, Xuguang |4 oth | |
| 700 | 1 | |a Wang, Shuyu |4 oth | |
| 700 | 1 | |a Wu, Jian |4 oth | |
| 700 | 1 | |a Dong, Xinning |4 oth | |
| 700 | 1 | |a Fang, Juan |4 oth | |
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10.1002/2017JD027180 doi PQ20171125 (DE-627)OLC1997849119 (DE-599)GBVOLC1997849119 (PRQ)p1014-16384c4bb66f1c41bcebff8439f2488a6610855174070783f6d074cbd8de9cb00 (KEY)0137985220170000122002000000heatwavesinchinadefinitionsleadingpatternsandconne DE-627 ger DE-627 rakwb eng 550 DNB Wang, Pinya verfasserin aut Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. definition SST circulation heat waves variability Rossby waves Sea surface Surface temperatures Wave packets Dry land Maximum temperatures Wave trains Duration Variation Waves Climatology Modes Walker circulation Sea surface temperatures Pressure Diabatic heating Heat tolerance Atmospheric circulation Wave propagation Surface temperature Orthogonal functions Heating Regional climatology Heat Tropical environment Anomalies Sea surface temperature Heat waves Tang, Jianping oth Sun, Xuguang oth Wang, Shuyu oth Wu, Jian oth Dong, Xinning oth Fang, Juan oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 20 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:20 http://dx.doi.org/10.1002/2017JD027180 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD027180/abstract https://search.proquest.com/docview/1964263879 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 20 |
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10.1002/2017JD027180 doi PQ20171125 (DE-627)OLC1997849119 (DE-599)GBVOLC1997849119 (PRQ)p1014-16384c4bb66f1c41bcebff8439f2488a6610855174070783f6d074cbd8de9cb00 (KEY)0137985220170000122002000000heatwavesinchinadefinitionsleadingpatternsandconne DE-627 ger DE-627 rakwb eng 550 DNB Wang, Pinya verfasserin aut Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. definition SST circulation heat waves variability Rossby waves Sea surface Surface temperatures Wave packets Dry land Maximum temperatures Wave trains Duration Variation Waves Climatology Modes Walker circulation Sea surface temperatures Pressure Diabatic heating Heat tolerance Atmospheric circulation Wave propagation Surface temperature Orthogonal functions Heating Regional climatology Heat Tropical environment Anomalies Sea surface temperature Heat waves Tang, Jianping oth Sun, Xuguang oth Wang, Shuyu oth Wu, Jian oth Dong, Xinning oth Fang, Juan oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 20 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:20 http://dx.doi.org/10.1002/2017JD027180 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD027180/abstract https://search.proquest.com/docview/1964263879 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 20 |
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10.1002/2017JD027180 doi PQ20171125 (DE-627)OLC1997849119 (DE-599)GBVOLC1997849119 (PRQ)p1014-16384c4bb66f1c41bcebff8439f2488a6610855174070783f6d074cbd8de9cb00 (KEY)0137985220170000122002000000heatwavesinchinadefinitionsleadingpatternsandconne DE-627 ger DE-627 rakwb eng 550 DNB Wang, Pinya verfasserin aut Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. definition SST circulation heat waves variability Rossby waves Sea surface Surface temperatures Wave packets Dry land Maximum temperatures Wave trains Duration Variation Waves Climatology Modes Walker circulation Sea surface temperatures Pressure Diabatic heating Heat tolerance Atmospheric circulation Wave propagation Surface temperature Orthogonal functions Heating Regional climatology Heat Tropical environment Anomalies Sea surface temperature Heat waves Tang, Jianping oth Sun, Xuguang oth Wang, Shuyu oth Wu, Jian oth Dong, Xinning oth Fang, Juan oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 20 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:20 http://dx.doi.org/10.1002/2017JD027180 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD027180/abstract https://search.proquest.com/docview/1964263879 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 20 |
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10.1002/2017JD027180 doi PQ20171125 (DE-627)OLC1997849119 (DE-599)GBVOLC1997849119 (PRQ)p1014-16384c4bb66f1c41bcebff8439f2488a6610855174070783f6d074cbd8de9cb00 (KEY)0137985220170000122002000000heatwavesinchinadefinitionsleadingpatternsandconne DE-627 ger DE-627 rakwb eng 550 DNB Wang, Pinya verfasserin aut Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. definition SST circulation heat waves variability Rossby waves Sea surface Surface temperatures Wave packets Dry land Maximum temperatures Wave trains Duration Variation Waves Climatology Modes Walker circulation Sea surface temperatures Pressure Diabatic heating Heat tolerance Atmospheric circulation Wave propagation Surface temperature Orthogonal functions Heating Regional climatology Heat Tropical environment Anomalies Sea surface temperature Heat waves Tang, Jianping oth Sun, Xuguang oth Wang, Shuyu oth Wu, Jian oth Dong, Xinning oth Fang, Juan oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 20 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:20 http://dx.doi.org/10.1002/2017JD027180 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD027180/abstract https://search.proquest.com/docview/1964263879 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 20 |
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10.1002/2017JD027180 doi PQ20171125 (DE-627)OLC1997849119 (DE-599)GBVOLC1997849119 (PRQ)p1014-16384c4bb66f1c41bcebff8439f2488a6610855174070783f6d074cbd8de9cb00 (KEY)0137985220170000122002000000heatwavesinchinadefinitionsleadingpatternsandconne DE-627 ger DE-627 rakwb eng 550 DNB Wang, Pinya verfasserin aut Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China Nutzungsrecht: © 2017. American Geophysical Union. All Rights Reserved. definition SST circulation heat waves variability Rossby waves Sea surface Surface temperatures Wave packets Dry land Maximum temperatures Wave trains Duration Variation Waves Climatology Modes Walker circulation Sea surface temperatures Pressure Diabatic heating Heat tolerance Atmospheric circulation Wave propagation Surface temperature Orthogonal functions Heating Regional climatology Heat Tropical environment Anomalies Sea surface temperature Heat waves Tang, Jianping oth Sun, Xuguang oth Wang, Shuyu oth Wu, Jian oth Dong, Xinning oth Fang, Juan oth Enthalten in Journal of geophysical research / D Washington, DC : Union, 1984 122(2017), 20 (DE-627)130444391 (DE-600)710256-2 (DE-576)015978818 2169-897X nnns volume:122 year:2017 number:20 http://dx.doi.org/10.1002/2017JD027180 Volltext http://onlinelibrary.wiley.com/doi/10.1002/2017JD027180/abstract https://search.proquest.com/docview/1964263879 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_62 GBV_ILN_154 AR 122 2017 20 |
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Wang, Pinya ddc 550 misc definition misc SST misc circulation misc heat waves misc variability misc Rossby waves misc Sea surface misc Surface temperatures misc Wave packets misc Dry land misc Maximum temperatures misc Wave trains misc Duration misc Variation misc Waves misc Climatology misc Modes misc Walker circulation misc Sea surface temperatures misc Pressure misc Diabatic heating misc Heat tolerance misc Atmospheric circulation misc Wave propagation misc Surface temperature misc Orthogonal functions misc Heating misc Regional climatology misc Heat misc Tropical environment misc Anomalies misc Sea surface temperature misc Heat waves Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs |
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550 DNB Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs definition SST circulation heat waves variability Rossby waves Sea surface Surface temperatures Wave packets Dry land Maximum temperatures Wave trains Duration Variation Waves Climatology Modes Walker circulation Sea surface temperatures Pressure Diabatic heating Heat tolerance Atmospheric circulation Wave propagation Surface temperature Orthogonal functions Heating Regional climatology Heat Tropical environment Anomalies Sea surface temperature Heat waves |
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heat waves in china: definitions, leading patterns, and connections to large‐scale atmospheric circulation and ssts |
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Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs |
| abstract |
Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China |
| abstractGer |
Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China |
| abstract_unstemmed |
Based on the daily maximum temperatures ( T max ) from 587 surface observation stations in China during 1959–2013, heat waves are detected using both absolute and relative definitions. The spatiotemporal variations of heat wave occurrence/duration/amplitude are compared between the two definitions. Considering the significant differences in regional climatology, relative threshold is more meaningful to detect the local extremes. By utilizing the empirical orthogonal function, the integral index heat wave total intensity is decomposed into three dominant modes: interdecadal (ID), interannual‐tripole (IA‐TR), and interannual‐dipole (IA‐DP) modes. The ID mode shows uniform anomalies over the whole China, with the maximum in north, and its corresponding time series depict notable interdecadal variations with a turning point around mid‐1990s. The IA‐DP mode exhibits opposite‐signed anomalies over north and south China. The IA‐TR mode shows an anomalous tripole pattern with negative anomalies over central China and positive anomalies over north and south China in its positive phase. Both the IA‐DP and IA‐TR patterns are more obvious since mid‐1990s with mainly year‐to‐year variations before that. All the three modes are controlled by anomalous high‐pressure systems, which are accompanied by local‐scale dry land conditions. The diabatic heating associated with anomalous convective activities over tropical western Pacific triggers Rossby wave trains propagating northward along the East Asia, which causes abnormal heat waves through descending motion over the high‐pressure nodes. In turn, the severe convections are generated by enhanced Walker circulation in the tropical Pacific due to warming and/or cooling sea surface temperature (SST) anomalies in the tropical western and eastern Pacific, respectively. Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China |
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Heat Waves in China: Definitions, Leading Patterns, and Connections to Large‐Scale Atmospheric Circulation and SSTs |
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Tang, Jianping Sun, Xuguang Wang, Shuyu Wu, Jian Dong, Xinning Fang, Juan |
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Definitions and measures for different aspects of heat waves are identified Three leading modes of heat wave variability dominate in China Anomalous convective activities over tropical western Pacific are the key factors for the major heat waves in China</subfield></datafield><datafield tag="540" ind1=" " ind2=" "><subfield code="a">Nutzungsrecht: © 2017. American Geophysical Union. 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