A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods

A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to...
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Gespeichert in:

Autor*in:	Guangzhi Xu [verfasserIn] Xiaohui Ma [verfasserIn] Ping Chang [verfasserIn] Lin Wang [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	atmospheric river storm tracks tracking algorithm

Übergeordnetes Werk:	In: Atmosphere - MDPI AG, 2011, 11(2020), 6, p 628
Übergeordnetes Werk:	volume:11 ; year:2020 ; number:6, p 628

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/atmos11060628

Katalog-ID:	DOAJ07675779X

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520			\|a A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively.
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matchkey_str	article:20734433:2020----::cmaioonrhrhmshramshrcieseetdynwmgpoesnbsdehdnm
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allfields	10.3390/atmos11060628 doi (DE-627)DOAJ07675779X (DE-599)DOAJ476f954b97ce415aa0f0d8c34c8e8cc1 DE-627 ger DE-627 rakwb eng QC851-999 Guangzhi Xu verfasserin aut A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively. atmospheric river storm tracks tracking algorithm Meteorology. Climatology Xiaohui Ma verfasserin aut Ping Chang verfasserin aut Lin Wang verfasserin aut In Atmosphere MDPI AG, 2011 11(2020), 6, p 628 (DE-627)657584010 (DE-600)2605928-9 20734433 nnns volume:11 year:2020 number:6, p 628 https://doi.org/10.3390/atmos11060628 kostenfrei https://doaj.org/article/476f954b97ce415aa0f0d8c34c8e8cc1 kostenfrei https://www.mdpi.com/2073-4433/11/6/628 kostenfrei https://doaj.org/toc/2073-4433 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2020 6, p 628
spelling	10.3390/atmos11060628 doi (DE-627)DOAJ07675779X (DE-599)DOAJ476f954b97ce415aa0f0d8c34c8e8cc1 DE-627 ger DE-627 rakwb eng QC851-999 Guangzhi Xu verfasserin aut A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively. atmospheric river storm tracks tracking algorithm Meteorology. Climatology Xiaohui Ma verfasserin aut Ping Chang verfasserin aut Lin Wang verfasserin aut In Atmosphere MDPI AG, 2011 11(2020), 6, p 628 (DE-627)657584010 (DE-600)2605928-9 20734433 nnns volume:11 year:2020 number:6, p 628 https://doi.org/10.3390/atmos11060628 kostenfrei https://doaj.org/article/476f954b97ce415aa0f0d8c34c8e8cc1 kostenfrei https://www.mdpi.com/2073-4433/11/6/628 kostenfrei https://doaj.org/toc/2073-4433 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2020 6, p 628
allfields_unstemmed	10.3390/atmos11060628 doi (DE-627)DOAJ07675779X (DE-599)DOAJ476f954b97ce415aa0f0d8c34c8e8cc1 DE-627 ger DE-627 rakwb eng QC851-999 Guangzhi Xu verfasserin aut A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively. atmospheric river storm tracks tracking algorithm Meteorology. Climatology Xiaohui Ma verfasserin aut Ping Chang verfasserin aut Lin Wang verfasserin aut In Atmosphere MDPI AG, 2011 11(2020), 6, p 628 (DE-627)657584010 (DE-600)2605928-9 20734433 nnns volume:11 year:2020 number:6, p 628 https://doi.org/10.3390/atmos11060628 kostenfrei https://doaj.org/article/476f954b97ce415aa0f0d8c34c8e8cc1 kostenfrei https://www.mdpi.com/2073-4433/11/6/628 kostenfrei https://doaj.org/toc/2073-4433 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2020 6, p 628
allfieldsGer	10.3390/atmos11060628 doi (DE-627)DOAJ07675779X (DE-599)DOAJ476f954b97ce415aa0f0d8c34c8e8cc1 DE-627 ger DE-627 rakwb eng QC851-999 Guangzhi Xu verfasserin aut A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively. atmospheric river storm tracks tracking algorithm Meteorology. Climatology Xiaohui Ma verfasserin aut Ping Chang verfasserin aut Lin Wang verfasserin aut In Atmosphere MDPI AG, 2011 11(2020), 6, p 628 (DE-627)657584010 (DE-600)2605928-9 20734433 nnns volume:11 year:2020 number:6, p 628 https://doi.org/10.3390/atmos11060628 kostenfrei https://doaj.org/article/476f954b97ce415aa0f0d8c34c8e8cc1 kostenfrei https://www.mdpi.com/2073-4433/11/6/628 kostenfrei https://doaj.org/toc/2073-4433 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2020 6, p 628
allfieldsSound	10.3390/atmos11060628 doi (DE-627)DOAJ07675779X (DE-599)DOAJ476f954b97ce415aa0f0d8c34c8e8cc1 DE-627 ger DE-627 rakwb eng QC851-999 Guangzhi Xu verfasserin aut A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively. atmospheric river storm tracks tracking algorithm Meteorology. Climatology Xiaohui Ma verfasserin aut Ping Chang verfasserin aut Lin Wang verfasserin aut In Atmosphere MDPI AG, 2011 11(2020), 6, p 628 (DE-627)657584010 (DE-600)2605928-9 20734433 nnns volume:11 year:2020 number:6, p 628 https://doi.org/10.3390/atmos11060628 kostenfrei https://doaj.org/article/476f954b97ce415aa0f0d8c34c8e8cc1 kostenfrei https://www.mdpi.com/2073-4433/11/6/628 kostenfrei https://doaj.org/toc/2073-4433 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 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_4338 GBV_ILN_4367 GBV_ILN_4700 AR 11 2020 6, p 628
language	English
source	In Atmosphere 11(2020), 6, p 628 volume:11 year:2020 number:6, p 628
sourceStr	In Atmosphere 11(2020), 6, p 628 volume:11 year:2020 number:6, p 628
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	atmospheric river storm tracks tracking algorithm Meteorology. Climatology
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container_title	Atmosphere
authorswithroles_txt_mv	Guangzhi Xu @@aut@@ Xiaohui Ma @@aut@@ Ping Chang @@aut@@ Lin Wang @@aut@@
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callnumber-first	Q - Science
author	Guangzhi Xu
spellingShingle	Guangzhi Xu misc QC851-999 misc atmospheric river misc storm tracks misc tracking algorithm misc Meteorology. Climatology A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods
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topic_title	QC851-999 A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods atmospheric river storm tracks tracking algorithm
topic	misc QC851-999 misc atmospheric river misc storm tracks misc tracking algorithm misc Meteorology. Climatology
topic_unstemmed	misc QC851-999 misc atmospheric river misc storm tracks misc tracking algorithm misc Meteorology. Climatology
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title	A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods
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title_full	A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods
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author_browse	Guangzhi Xu Xiaohui Ma Ping Chang Lin Wang
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title_sort	comparison of northern hemisphere atmospheric rivers detected by a new image-processing based method and magnitude-thresholding based methods
callnumber	QC851-999
title_auth	A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods
abstract	A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively.
abstractGer	A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively.
abstract_unstemmed	A majority of the existing atmospheric rivers (ARs) detection methods is based on magnitude thresholding on either the integrated water vapor (IWV) or integrated vapor transport (IVT). One disadvantage of such an approach is that the predetermined threshold does not have the flexibility to adjust to the fast changing conditions where ARs are embedded. To address this issue, a new AR detection method is derived from an image-processing algorithm that makes the detection independent of AR magnitude. In this study, we compare the North Pacific and Atlantic ARs tracked by the new detection method and two widely used magnitude thresholding methods in the present day climate. The results show considerable sensitivities of the detected AR number, shape, intensities and their accounted IVT accumulations to different methods. In many aspects, ARs detected by the new method lie between those from the two magnitude thresholding methods, but stand out with a greater number of AR tracks, longer track durations, and stronger AR-related moisture transport in the AR tracks. North Pacific and North Atlantic ARs identified by the new method account for around 100–120 <inline-formula< <math display="inline"< <semantics< <mrow< <mo<×</mo< <mo< </mo< <msup< <mn<10</mn< <mn<3</mn< </msup< </mrow< </semantics< </math< </inline-formula< kg/m/s IVT within the AR track regions, about <inline-formula< <math display="inline"< <semantics< <mrow< <mn<50</mn< <mo<%</mo< </mrow< </semantics< </math< </inline-formula< more than the other two methods. This is primarily due to the fact that the new method captures the strong IVT signals more effectively.
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container_issue	6, p 628
title_short	A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods
url	https://doi.org/10.3390/atmos11060628 https://doaj.org/article/476f954b97ce415aa0f0d8c34c8e8cc1 https://www.mdpi.com/2073-4433/11/6/628 https://doaj.org/toc/2073-4433
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up_date	2024-07-03T22:15:08.971Z
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A Comparison of Northern Hemisphere Atmospheric Rivers Detected by a New Image-Processing Based Method and Magnitude-Thresholding Based Methods

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