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DOI10.1175/JCLI-D-17-0408.1
Influence of the Pacific-Japan Pattern on Indian Summer Monsoon Rainfall
Srinivas, G.1,2; Chowdary, Jasti S.1; Kosaka, Yu3; Gnanaseelan, C.1; Parekh, Anant1; Prasad, K. V. S. R.2
2018-05-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2018
卷号31期号:10页码:3943-3958
文章类型Article
语种英语
国家India; Japan
英文摘要

This study discusses the impact of the Pacific-Japan (PJ) pattern on Indian summer monsoon (ISM) rainfall and its possible physical linkages through coupled and uncoupled pathways. Empirical orthogonal function analysis of 850-hPa relative vorticity over the western North Pacific (WNP) is used to extract the PJ pattern as the leading mode of circulation variability. The partial correlation analysis of the leading principal component reveals that the positive PJ pattern, which features anticyclonic and cyclonic low-level circulation anomalies over the tropical WNP and around Japan respectively, enhances the rainfall over the southern and northern parts of India. The northwestward propagating Rossby waves, in response to intensified convection over the Maritime Continent reinforced by low-level convergence in the southern flank of westward extended tropical WNP anticyclone, increase rainfall over southern peninsular India. Meanwhile, the anomalous moisture transport from the warm Bay of Bengal due to anomalous southerlies at the western edge of the low-level anticyclone extending from the tropical WNP helps to enhance the rainfall over northern India. The atmospheric general circulation model forced with climatological sea surface temperature confirms this atmospheric pathway through the westward propagating Rossby waves. Furthermore, the north Indian Ocean (NIO) warming induced by easterly wind anomalies along the southern periphery of the tropical WNP-NIO anticyclone enhances local convection, which in turn feeds back to the WNP convection anomalies. This coupled nature via interbasin feedback between the PJ pattern and NIO is confirmed using coupled model sensitivity experiments. These results are important in identifying new sources of ISM variability/predictability on the interannual time scale.


英文关键词Teleconnections Monsoons Precipitation Interannual variability
领域气候变化
收录类别SCI-E
WOS记录号WOS:000430803800001
WOS关键词SEA-SURFACE TEMPERATURE ; INDO-WESTERN PACIFIC ; CLIMATE FORECAST SYSTEM ; EL-NINO ; INTRASEASONAL OSCILLATION ; ENSO RELATIONSHIP ; TELECONNECTION PATTERN ; SOUTHERN OSCILLATION ; SCALE VARIABILITY ; OCEAN CAPACITOR
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/20669
专题气候变化
作者单位1.Indian Inst Trop Meteorol, Pune, Maharashtra, India;
2.Andhra Univ, Dept Meteorol & Oceanog, Visakhapatnam, Andhra Prades, India;
3.Univ Tokyo, Res Ctr Adv Sci & Technol, Tokyo, Japan
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Srinivas, G.,Chowdary, Jasti S.,Kosaka, Yu,et al. Influence of the Pacific-Japan Pattern on Indian Summer Monsoon Rainfall[J]. JOURNAL OF CLIMATE,2018,31(10):3943-3958.
APA Srinivas, G.,Chowdary, Jasti S.,Kosaka, Yu,Gnanaseelan, C.,Parekh, Anant,&Prasad, K. V. S. R..(2018).Influence of the Pacific-Japan Pattern on Indian Summer Monsoon Rainfall.JOURNAL OF CLIMATE,31(10),3943-3958.
MLA Srinivas, G.,et al."Influence of the Pacific-Japan Pattern on Indian Summer Monsoon Rainfall".JOURNAL OF CLIMATE 31.10(2018):3943-3958.
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