中国农业气象

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修正帕默尔干旱指数在农业干旱监测中的应用

叶建刚;申双和;吕厚荃;   

  1. 南京信息工程大学应用气象学院;国家气象中心;
  • 出版日期:2009-04-10 发布日期:2009-04-10
  • 基金资助:
    国家“十一五”科技支撑计划项目“农业重大气象灾害监测预警与调控技术研究”(2006BAD04B09);; 中国气象局基建项目“国家级农业干旱预报业务系统”

Application of Modified Palmer Drought Severity Index in Agricultural Drought Monitoring

YE Jian-gang1,SHEN Shuang-he1,Lü Hou-quan2(1.Colloge of Applied Meteorology,Nanjing University of Information Science & Technology,Nanjing 210044,China;2.National Meteorological Center,CMA,Bejing 100081)   

  • Online:2009-04-10 Published:2009-04-10

摘要: 为了提高对农业干旱监测的准确性和时效性,本文通过分析帕默尔干旱指数原理,结合农业干旱发生的特征,在计算土壤水分的过程中引入了作物系数和胁迫系数,同时修正农业干旱的持续时间,缩短计算干旱的时间步长,并利用山东省23个站点1961-2007年的逐日气象资料建立用于农业干旱监测的逐旬帕默尔干旱指数。与农业干旱发生的实际情况对比表明,修正后的旬帕默尔干旱指数能准确地反映土壤水分变化,提高了对短期干湿变化的敏感度,整个旱情变化过程比较符合实际情况,对监测农业干旱具有实际意义。

关键词: 帕默尔干旱指数, 修正, 土壤水分, 农业干旱监测

Abstract: In order to improve the accuracy and timeliness of the agricultural drought monitoring,the crop coefficient and stress coefficient were introduced to calculate the soil moisture according to the theory of Palmer drought severity index and the characteristics of agricultural drought.The duration of agricultural drought was simultaneously revised to shorten the time steps of drought monitoring.Based on the daily meteorological data of 23 stations in Shangdong Province from 1961 to 2007,the palmer drought index for each ten days was built to monitor the agricultural drought.In comparison with the actual situations of agricultural drought,the revised palmer drought index could accurately reflect the variability of the soil moisture.The sensitivity of the short-term dry-wet variation was improved.The whole course of drought variation was basically accordant with the practical situation.

Key words: Palmer drought index, Palmer drought index, Revision, Soil moisture, Agriculture drought monitoring