近33a河南省四季地面水汽压时空分布特征

利用河南省49个地面气象台站1979—2011年的月平均地面水汽压资料,分析了近33a来河南省四季水汽压的时空分布特征,在此基础上,对夏季地面水汽压进行了分区。结果表明:①河南省四季地面水汽压多年平均的空间分布较为相似,都呈现出由西北向东南递增的趋势。②EOF分解表明,河南省四季地面水汽压空间变化的最主要分布是全省一致型。③河南省四季地面水汽压存在明显的年际和年代际变化,除冬季主要存在准15a的年代际变化外,其余季节则在多数时段存在着准5a左右的年际变化;各季地面水汽压均呈线性增加趋势,其中冬春(夏秋)季增加趋势(不)明显。④通过REOF分解,结合地理位置和气候特点,可将河南省夏季地面水汽压分为豫北、豫东南和豫西3个区。

The Temporal and Spatial Distribution Characteristics of the Surface Vapor Pressure of Four Seasons in Henan Province in Recent 33 Years

Using the monthly surface vapor pressure data of 49 meteorological stations in Henan Province from 1979 to 2011, temporal and spatial variability features of four seasons are studied. On the basis of the study, the summer of surface vapor pressure in Henan Province is divided. The results show： ① The surface vapor pressure of four seasons distribution exhibit similar features, they are both showed increasing trend from the northwest to the southeast; ②The surface vapor pressure of four seasons of spatial distribution are performance out overall consistent of changing feature by the means of EOF, which is the main of distribution; ③The surface vapor pressure of four seasons exist notably interannual and interdecadal variations, in addition to the winter mainly exists 15a interdecadal change, the other seasons in most periods exist interannual variability of 5a; seasonal surface vapor pressure shows a linear tendency to rise, the increasing trend of winter and spring（summer and autumn） are obvious（not）; ④By the decomposition of REOF, combined with the geographical location and climate characteristics, the summer of surface vapor pressure in Henan Province could be divided into three areas： northern zone, southeast area and western district.