Analysis on the Reasons for Consecutive Severe Droughts in Autumn and Winter in Xuzhou in 2008  

作　　者：ZHAO Jie LV Xiang PENG Ming-yan ZHANG Bai-zhan SUN Jian-yin 

机构地区：[1]Xuzhou Meteorological Bureau of Jiangsu Province,Xuzhou 221002,China

出　　处：《Meteorological and Environmental Research》2011年第2期43-45,共3页气象与环境研究(英文版)

基　　金：Supported by Xuzhou Scientific Program (XM09B023)

摘　　要：[Objective] The aim was to study the reasons for consecutive severe droughts in autumn and winter. [Method] By dint of precipitation in the observatory station and NCEP/NCAR reanalysis data in observatory station, the circulation background, vertical movement, abnormal temperature and changes of water vapor conditions in Xuzhou from October 2008 to January 2009 were expounded to reveal the causes for consecutive drought in autumn and winter. [Result] Xuzhou was under stable situation for a long time in autumn and winter in 2008, being behind east coastal trough, the downward airstream prevailing; the south trough intensity was weak, and in addition to the east subtropical high and weak intensity, the water vapor transportation condition in Indian Ocean and South Sea was unfavorable. The autumn was warm and the cold air was weak; ever since winter, there were several cold air activities. But the influencing body was in the east, and the south warm and wet airstream was insufficient. Thus, they couldn’t met, which resulted into gale and lower temperature and less precipitation when under the influence of cold air. [Conclusion] The study provided theoretical basis for the prevention of drought in the area.[Objective] The aim was to study the reasons for consecutive severe droughts in autumn and winter. [Method] By dint of precipitation in the observatory station and NCEP/NCAR reanalysis data in observatory station, the circulation background, vertical movement, abnormal temperature and changes of water vapor conditions in Xuzhou from October 2008 to January 2009 were expounded to reveal the causes for consecutive drought in autumn and winter. [Result] Xuzhou was under stable situation for a long time in autumn and winter in 2008, being behind east coastal trough, the downward airstream prevailing; the south trough intensity was weak, and in addition to the east subtropical high and weak intensity, the water vapor transportation condition in Indian Ocean and South Sea was unfavorable. The autumn was warm and the cold air was weak; ever since winter, there were several cold air activities. But the influencing body was in the east, and the south warm and wet airstream was insufficient. Thus, they couldn't met, which resulted into gale and lower temperature and less precipitation when under the influence of cold air. [Conclusion] The study provided theoretical basis for the prevention of drought in the area.

关 键 词：Consecutive drought in autumn and winter Causes analysis Xuzhou area China 

分 类 号：P426.616[天文地球—大气科学及气象学]