【摘要】 选取1961-2009年福建省5个气象站逐日气温和降水资料,引入线性递减非等权重方案计算综合气象干旱指数CI_new,通过比较分析CI_new与等权重方案计算的CI_old在干旱过程描述能力、干旱频率以及干旱年际变化特征上的差异,了解CI_new的改进效果及其在福建省的适用性。结果表明,CI_new与CI_old均能较合理地反映福建干旱频率分布特征和干旱强度变化特征,但CI_new在干旱监测过程中的不合理跳跃次数明显减少,有效克服了CI_old表现的不合理旱情加剧的问题;CI_new表现的缓解干旱的过程较CI_old敏感。因此,CI_new可以作为气象干旱监测业务和评估的指标之一。更多还原

【Abstract】 The new comprehensive meteorological drought index(CI_new) was calculated by using linear decreasing unequal weight method based on the daily temperature and precipitation data at five meteorological stations from 1961 to 2009,and the old comprehensive meteorological drought index(CI_old) was calculated by using equal weight method.The improved effect and suitability of CI_new in Fujian province was studied by comparing the difference on drought characteristic between the new comprehensive meteorological drought index(CI_new) and the old comprehensive meteorological drought index(CI_old).The results showed that both CI_new and CI_old could reflected the distribution characteristic of drought frequency and the annual variation of drought strength.But the unreasonable jump times by CI_new was decreased significantly than CI_old,and it avoided effectively the unreasonable drought aggravate problem.CI_new was more sensitively than CI_old at the remission drought process.Therefore,CI_new could be an index of meteorological drought monitoring and evaluation.更多还原