By using the monthly precipitation data of Jiangsu province and the NCEP/NCAR monthly reanalysis data, combining with the abnormal precipitation mechanism analysis in Jiangsu province in recently 40 years, the differences between the Autumn-Winter-Spring Drought(AWSD) in 2010/2011 and other three sustained drought processes in recent 40 years in Jiangsu have been studied, respectively. The results show that the drought has maintained for the longest time in 1980/1981 and been most serious in 2010/2011. From the perspective of climatic factors, the drought grade of the troposphere and the intensity of sinking movement have been strong and sustained for a long time. In 1980/1981 and 2010/2011, potential height field presented high pressure in the west and low pressure in the east on 500 hPa, which is beneficial to East Asia trough enhancement and maintenance. Meanwhile, consistent with the blocking situation in the west Baikal Lake and the stronger winter monsoon, cold air moved southward frequently, which blocked the transmission of the south warm air, and made air more drier. SST anomaly distribution displayed as La Nina type. SST anomalies were negative in the east central Pacific around the equator and near the eastern coast in China, while positive in west central Pacific. Such abnormal distribution tended to form ‘east low and west high’ in potential height. Compared with the other two sustained drought processes, the drought intensity in 1998/1999 and 2008/2009 were slightly weaker, so there were also some differences in atmosphere background field and SST anomaly distribution.
ZHANG Pengbo
,
JIANG Youshan
,
LIU Lei
,
LI Yi
,
HU Shanshan
. Comparative Analysis of Sustained Drought Processes in Jiangsu during 1971-2011[J]. Plateau Meteorology, 2015
, 34(2)
: 444
-454
.
DOI: 10.7522/j.issn.1000-0534.2013.00174
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