夏季干旱逐日动态监测指数研究

STUDY OF THE SUMMER DROUGHT TREND MONITORING INDEX

根据造成干旱的主要气象因素是降水持续偏少、气温偏高、蒸发量大的思路,利用逐日降水量和逐日最高气温资料进行实验研究,设计了夏季干旱的逐日动态监测指数。该指数可根据每日最新日降水值和日最高气温值的变化,及时给出影响干旱程度变化的主要气象因素的变化,使干旱监测具有实时性、敏感性和连贯性。利用该指数对2003年江西夏季发生的特大干旱进行逐日跟踪动态监测,监测结果表明该指数可以实时反映实际干旱的变化趋势。

According to the thought that the main factor of drought is the durative low precipitation and high temperature,we design the Drought Trend Monitoring Index to investigate the daytime precipitation and the highest temperature in summer in Jiangxi province.Because the change of the main factor of drought is given by the daytime precipitation and the highest temperature every day,the index is real-time,sensitive and consistent.We apply this index to the summer of 2003 when serious drought occurred by tracking on the dynamic monitoring every day.The result indicates that this index can reflect the Drought change tendency.