Variations of the summer Somali and Australia cross-equatorial flows and the implications for the Asian summer monsoon |
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| Authors: | ZHU Yali |
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| Institution: | Nansen-Zhu International Research Centre, Institute of Atmospheric Physics,
Chinese Academy of Sciences, Beijing 100029,
Climate Change Research Center, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The temporal variations during 1948--2010 and vertical structures of the
summer Somali and Australia cross-equatorial flows (CEFs) and the
implications for the Asian summer monsoon were explored in this study. The
strongest southerly and northerly CEFs exist at 925 hPa and 150 hPa level,
respectively. The low-level Somali (LLS) CEFs were significantly connected
with the rainfall in most regions of India (especially the monsoon regions),
except in a small area in southwest India. In comparison to the climatology,
the low-level Australia (LLA) CEFs exhibited stronger variations at
interannual time scale and are more closely connected to the East Asian
summer monsoon circulation than to the LLS CEFs.
The East Asian summer monsoon circulation anomalies related to stronger LLA
CEFs were associated with less water vapor content and less rainfall in the
region between the middle Yellow River and Yangtze River and with more water
vapor and more rainfall in southern China. The sea-surface temperature
anomalies east of Australia related to summer LLA CEFs emerge in spring and
persist into summer, with implications for the seasonal prediction of summer
rainfall in East Asia. The connection between the LLA CEFs and East Asian
summer monsoon rainfall may be partly due to its linkage with El
Nino-Southern Oscillation. In addition, both the LLA and LLS CEFs exhibited
interdecadal shifts in the late 1970s and the late 1990s, consistent with
the phase shifts of Pacific Decadal Oscillation (PDO). |
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| Keywords: | cross-equatorial flow Asian summer monsoon low-level jet Somali |
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