Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific

Interdecadal change in the relationship between the winter Siberian high (SH) and tropical cyclone genesis frequency (TCGF) is investigated using observational and reanalysis data. Focus is on the Western North Pacific (WNP) where environmental background associated with TCGF is closely related to t...

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Published in:Atmosphere
Main Authors: Yi-Fei Gong, Fang Zhou, Chao Wang, Jian Shi
Format: Text
Language:English
Published: Multidisciplinary Digital Publishing Institute 2022
Subjects:
Online Access:https://doi.org/10.3390/atmos13091342
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spelling ftmdpi:oai:mdpi.com:/2073-4433/13/9/1342/ 2023-08-20T03:59:26+02:00 Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific Yi-Fei Gong Fang Zhou Chao Wang Jian Shi agris 2022-08-23 application/pdf https://doi.org/10.3390/atmos13091342 EN eng Multidisciplinary Digital Publishing Institute Meteorology https://dx.doi.org/10.3390/atmos13091342 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 13; Issue 9; Pages: 1342 Siberian high tropical cyclone genesis frequency Western North Pacific interdecadal change Text 2022 ftmdpi https://doi.org/10.3390/atmos13091342 2023-08-01T06:10:55Z Interdecadal change in the relationship between the winter Siberian high (SH) and tropical cyclone genesis frequency (TCGF) is investigated using observational and reanalysis data. Focus is on the Western North Pacific (WNP) where environmental background associated with TCGF is closely related to the winter SH. It is demonstrated that the relationship presents clear interdecadal change during 1980–2020. A significant negative correlation dominates in the last two decades of the 20th century (P1), but it clearly weakens from the early 2000s onward (P2). Observational evidence shows that such interdecadal change is related dominantly to variations in the air–sea responses associated with the winter SH over the North Pacific. During P1, when the SH is anomalously strengthened, an Aleutian Low (AL) response occurs over the downstream North Pacific, which gradually develops into a meridional dipole distribution pattern consistent with the negative North Pacific Oscillation (NPO) mode during the following spring. The northeasterly wind anomaly over the subtropical North Pacific maintains and further delivers into the tropical Pacific. It favors easterly wind anomaly enhancement over the tropical Pacific around summer and grows into an anticyclonic circulation response in the WNP, which restrains the genesis of TCs. During P2, the eastward shift of the SH anomaly favors a weak AL over the Northeast Pacific followed by a northeastward-shifted anticyclone over the subtropical central-eastern Pacific, which confines the relatively weak northeasterly wind anomalies far away from the tropical Pacific. This was concurrent with a weakening relationship between the SH and WNP TCGF, indicating weaker downstream impacts of the winter SH. Text aleutian low MDPI Open Access Publishing Pacific Atmosphere 13 9 1342
institution Open Polar
collection MDPI Open Access Publishing
op_collection_id ftmdpi
language English
topic Siberian high
tropical cyclone genesis frequency
Western North Pacific
interdecadal change
spellingShingle Siberian high
tropical cyclone genesis frequency
Western North Pacific
interdecadal change
Yi-Fei Gong
Fang Zhou
Chao Wang
Jian Shi
Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific
topic_facet Siberian high
tropical cyclone genesis frequency
Western North Pacific
interdecadal change
description Interdecadal change in the relationship between the winter Siberian high (SH) and tropical cyclone genesis frequency (TCGF) is investigated using observational and reanalysis data. Focus is on the Western North Pacific (WNP) where environmental background associated with TCGF is closely related to the winter SH. It is demonstrated that the relationship presents clear interdecadal change during 1980–2020. A significant negative correlation dominates in the last two decades of the 20th century (P1), but it clearly weakens from the early 2000s onward (P2). Observational evidence shows that such interdecadal change is related dominantly to variations in the air–sea responses associated with the winter SH over the North Pacific. During P1, when the SH is anomalously strengthened, an Aleutian Low (AL) response occurs over the downstream North Pacific, which gradually develops into a meridional dipole distribution pattern consistent with the negative North Pacific Oscillation (NPO) mode during the following spring. The northeasterly wind anomaly over the subtropical North Pacific maintains and further delivers into the tropical Pacific. It favors easterly wind anomaly enhancement over the tropical Pacific around summer and grows into an anticyclonic circulation response in the WNP, which restrains the genesis of TCs. During P2, the eastward shift of the SH anomaly favors a weak AL over the Northeast Pacific followed by a northeastward-shifted anticyclone over the subtropical central-eastern Pacific, which confines the relatively weak northeasterly wind anomalies far away from the tropical Pacific. This was concurrent with a weakening relationship between the SH and WNP TCGF, indicating weaker downstream impacts of the winter SH.
format Text
author Yi-Fei Gong
Fang Zhou
Chao Wang
Jian Shi
author_facet Yi-Fei Gong
Fang Zhou
Chao Wang
Jian Shi
author_sort Yi-Fei Gong
title Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific
title_short Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific
title_full Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific
title_fullStr Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific
title_full_unstemmed Interdecadal Change in the Relationship between the Winter Siberian High and Summer Tropical Cyclone Genesis Frequency over the Western North Pacific
title_sort interdecadal change in the relationship between the winter siberian high and summer tropical cyclone genesis frequency over the western north pacific
publisher Multidisciplinary Digital Publishing Institute
publishDate 2022
url https://doi.org/10.3390/atmos13091342
op_coverage agris
geographic Pacific
geographic_facet Pacific
genre aleutian low
genre_facet aleutian low
op_source Atmosphere; Volume 13; Issue 9; Pages: 1342
op_relation Meteorology
https://dx.doi.org/10.3390/atmos13091342
op_rights https://creativecommons.org/licenses/by/4.0/
op_doi https://doi.org/10.3390/atmos13091342
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