The main rain band in the summer of 2010 has the obvious features of highly concentrated periods and areas, high intensities with extremely serious floods occurring in central and southern region of the Yangtze River and South China in June, extremely serious floods in Huaxi and Northeast China from middle July to August respectively. By using NCEP/NCAR reanalysis data and NOAA OLR, SSTA data, the influence of summer monsoon circulation on the rain band and the mechanisms for the abnormal features of summer monsoon circulation are analyzed. The results show that in the whole summer Western Pacific Subtropical High (WPSH) is stronger and more northward, South Asia High(SAH) is stronger and eastward, southwest monsoon is weaker and more westward. Both WPSH and SAH are markedly southward in June and northward from middle July to August. The efficient allocation of monsoon circulation leads to the rare torrential rain and floods. The positive SSTA in equatorial Indian Ocean and near Indonesia results in stronger convection, stronger heat resources and higher temperatures in the middle and upper atmosphere over there and weaker north-south temperature difference in South Asia even in the case of less snow cover and stronger heat resource over Tibet Plateau and higher temperature over southern Asian continent. The strong resources over Indonesia and nearby promote a strong and southward WPSH in June by sinking force effect and negative vorticity increase at the north side. From July to August, convection and heat resources over South China Sea and Philippines increase rapidly with SST, SAH strengthens and maintains northward due to strong heat resources over the Qinghai-Xizang Plateau and strong latent heat released by strong precipitation in Huaxi at the northwest side of WPSH, such factors are advantageous to a strong WPSH with northward ridge and westward west ridge point. Correlation analysis confirms the influence of SSTA on WPSH and SAH.
BAO Yuanyuan
,
KANG Zhiming
. Abnormal Features of Asian Summer Monsoon Circulation and Its Effects on Chinese Rain Band in 2010[J]. Plateau Meteorology, 2014
, 33(5)
: 1217
-1228
.
DOI: 10.7522/j.issn.1000-0534.2013.00099
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