兰州大学机构库
Impacts of April Stratosphere-Troposphere Coupling on the South Asian Premonsoon Circulation
Zhang, Chengyang1,2; Tian, Wenshou1; Zhang, Jiankai1; Zhang, Tuantuan1,2,3,4; Yu, Wei3,4; Yang, Song1,2,3,4; Wang, Tao1
2023-09
Source PublicationJOURNAL OF CLIMATE   Impact Factor & Quartile
ISSN0894-8755 ; 1520-0442
Volume36Issue:18Pages:6213-6227
page numbers15
AbstractThe premonsoon circulation over South Asia in May shows remarkable interannual variations, and it can modulate the onset of the Asian summer monsoon. The present study derives two dominant stratosphere-troposphere modes over the North Atlantic in April via applying principal component (PC) analysis to regional geopotential height during 1979-2015. Both of the modes reflect the North Atlantic Oscillation (NAO)-like circulation at the midtroposphere, but the circulation patterns and planetary wave activity between the two modes are quite different. The first mode represents a stratosphere-troposphere-coupled mode. Further analysis indicates that during the years with a positive phase of the first mode, the low-level anomalous southerlies over the northern Barents Sea (BS) lead to a reduction in local sea ice, which could persist into May through the ice-albedo feedback. The BS sea ice anomalies in May could generate a southeastward propagating Rossby wave train, producing an anomalous anticyclonic circulation to the west of Qinghai-Tibet Plateau. This anomalous anticyclone induces increases in local air temperature and the meridional temperature gradient, resulting in a strengthened premonsoon circulation. Given that prediction of the premonsoon circulation over South Asia remains a challenging issue, the stratosphere-troposphere-coupling modes in April provide another potential predictability source. On the other hand, ENSO has a significant effect on the South Asian premonsoon circulations in May, and can also lead to the NAO-like circulation by influencing atmospheric Rossby waves. Such an NAO-like circulation is closely related to the second mode.
KeywordTeleconnections Monsoons Stratosphere-troposphere coupling
PublisherAMER METEOROLOGICAL SOC
DOI10.1175/JCLI-D-22-0249.1
Indexed BySCIE
Language英语
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:001053911500001
Original Document TypeArticle
Citation statistics
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/568438
Collection兰州大学
Corresponding AuthorTian, Wenshou
Affiliation
1.Lanzhou Univ, Coll Atmospher Sci, Key Lab Semiarid Climate Change, Minist Educ, Lanzhou, Peoples R China;
2.Guangxi Meteorol Bur, Climate Ctr, Nanning, Peoples R China;
3.Sun Yat Sen Univ, Sch Atmospher Sci, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai, Peoples R China;
4.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change, Nat Disaster Studies, Zhuhai, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Chengyang,Tian, Wenshou,Zhang, Jiankai,et al. Impacts of April Stratosphere-Troposphere Coupling on the South Asian Premonsoon Circulation[J]. JOURNAL OF CLIMATE,2023,36(18):6213-6227.
APA Zhang, Chengyang.,Tian, Wenshou.,Zhang, Jiankai.,Zhang, Tuantuan.,Yu, Wei.,...&Wang, Tao.(2023).Impacts of April Stratosphere-Troposphere Coupling on the South Asian Premonsoon Circulation.JOURNAL OF CLIMATE,36(18),6213-6227.
MLA Zhang, Chengyang,et al."Impacts of April Stratosphere-Troposphere Coupling on the South Asian Premonsoon Circulation".JOURNAL OF CLIMATE 36.18(2023):6213-6227.
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