Characteristic Analysis of Summer Drought in Henan Province
Abstract：Based on the precipitation data of 103 dex, temporal-spatial features of the summer drought drought and western Pacific subtropical high, E1 Nino, meteorological stations of 1961-2010 and CI inwas analyzed, the relationships between summer La Nina also were studied. The results are as fol-lows. 1 ） The precipitation of early summer and midsummer showed a slowly increasing trend with the rate of 6. 065 mm/10a and 7. 505 mm/10a; the probability of early summer drought and heavy early summer drought is 44% and 22% , and that of midsummer drought and heavy midsummer drought is 20% and 0. 2） The precipitation of six sub-regions of early summer showed an increasing trend, and drought days of early summer showed a decreasing trend. The precipitation of midsummer is not spatially uniform, and it exhibited decreasing trends in north, but increasing trends in the rest sub-regions of the province. Whiledrought days of midsummer showed a decreasing trend in 1961-2010. 3） The cold air is less frequently and difficult to arrive in Henan province, meanwhile western Pacific subtropical high is weaker in early summer drought and midsummer drought years. 4） The rainfall of midsummer is more than normal when western drought Pacific subtropical high is further west to its normal position, and the probability of early summer is high in La Nina next years.
Keywords：CI drought indexearly summer droughtmidsummer droughtwestern Pacific subtrop-ical highE1 NinoLa Nina
Publication Date：2012-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 49-55 )