The Interannual Dominant Co-variation Mode of Boreal Summer Monsoon Rainfall during 1979–2014

The Interannual Dominant Co-variation Mode of Boreal Summer Monsoon Rainfall during 1979–2014 AbstractThe boreal summer monsoon (BSM), which includes the monsoons over India (IND), the western North Pacific (WNP), East Asia (EA), North America (NAM) and North Africa (NAF), shows prominent interannual variation (IAV) in summer precipitation and affects the areas with the largest populations in the world. In the present, we used the EOF analysis to extract the BSM dominant co-variation mode during 1979–2014. This mode is featured by the out-of-phase rainfall IAV over the WNP to the other BSM members. The BSM co-variation mode is closely associated with the upper- and lower-level coupled circulations, which are characterized by two anomalous zonal circulations over the tropical oceans coupled near the dateline and an abnormal meridional cell over the WNP and EA regions, respectively. Furthermore, the strength of this mode depends on the phase relationship of rainfall IAV between the WNP and NAM monsoon regions, which is modulated by the seasonal evolution of ENSO events and its resultant SSTAs in tropical Indian Ocean (TIO). The weaker mode is accompanied by the in-phase rainfall IAV between these two regions, along with the persisting ENSO events and stronger SSTA in the TIO from winter to summer. While in the years with fast-decaying ENSO events and the related weaker TIO SSTA, the out-of-phase rainfall IAV between the WNP and NAM region takes place to enhance this mode. A series of AGCM sensitivity experiments could reproduce the anomalies of atmospheric circulation related to the distinct seasonal evolution of ENSO events. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

The Interannual Dominant Co-variation Mode of Boreal Summer Monsoon Rainfall during 1979–2014

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0442
D.O.I.
10.1175/JCLI-D-17-0423.1
Publisher site
See Article on Publisher Site

Abstract

AbstractThe boreal summer monsoon (BSM), which includes the monsoons over India (IND), the western North Pacific (WNP), East Asia (EA), North America (NAM) and North Africa (NAF), shows prominent interannual variation (IAV) in summer precipitation and affects the areas with the largest populations in the world. In the present, we used the EOF analysis to extract the BSM dominant co-variation mode during 1979–2014. This mode is featured by the out-of-phase rainfall IAV over the WNP to the other BSM members. The BSM co-variation mode is closely associated with the upper- and lower-level coupled circulations, which are characterized by two anomalous zonal circulations over the tropical oceans coupled near the dateline and an abnormal meridional cell over the WNP and EA regions, respectively. Furthermore, the strength of this mode depends on the phase relationship of rainfall IAV between the WNP and NAM monsoon regions, which is modulated by the seasonal evolution of ENSO events and its resultant SSTAs in tropical Indian Ocean (TIO). The weaker mode is accompanied by the in-phase rainfall IAV between these two regions, along with the persisting ENSO events and stronger SSTA in the TIO from winter to summer. While in the years with fast-decaying ENSO events and the related weaker TIO SSTA, the out-of-phase rainfall IAV between the WNP and NAM region takes place to enhance this mode. A series of AGCM sensitivity experiments could reproduce the anomalies of atmospheric circulation related to the distinct seasonal evolution of ENSO events.

Journal

Journal of ClimateAmerican Meteorological Society

Published: Mar 6, 2018

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