河南省高温偏多和偏少年环流特征及其与OLR关系分析

Circulation Characteristics of Positive and Negative Years of High Temperature and Analysis on Their Relationship with OLR

首先,通过对河南省夏季≥35℃的高温天气偏多和偏少年采用合成对比的方法,分析了高温偏多与偏少年份大气环流的差异,结果表明,6月南亚高压强度尚弱,而7月南亚高压强度相对较强;6月份,高温偏少年南亚高压加强东伸,西太平洋副热带高压西伸,而7月则相反,即高温偏少年南亚高压加强东伸,而西太平洋副热带高压则表现为东撤。另外,高度距平场也有不同特征。然后,采用OLR资料对高温偏多和偏少的成因进行了探讨;最后,从预报的角度对河南省夏季高温天气与前期秋、冬、春季中低纬OLR进行了相关分析,结果表明,前期一些月份的OLR分布对河南省夏季的高温具有指示意义。

First,synthetic and contrast methods were adopted for positive and negative years of ？ 35 °C high temperature in spring in Henan Province to analyze the variance between positive and negative years of high temperature.The results showed that the intensity of South Asia high was weaker in June;in contrast,in July,the intensity of South Asia high was relatively strong;in June,South Asia high enhanced the eastward shift and the West Pacific subtropical high moved westward during negative years of high temperature;by contrast,in July,during negative years of high temperature,South Asia high enhanced the eastward shift,however,the West Pacific subtropical high moved eastward.In addition,there were different characteristics in height anomaly field.Then,the causing of positive and negative years of high temperature was discussed by adopting OLR materials.Finally,the correlation analysis of high temperatures in summer and low-middle latitude OLR in preliminary autumn,winter and spring season was carried out from the angle of forecast.The results showed that OLR distribution of early months was of indicating significance to high temperatures of summer in Henan Province