热带气象学报2017，Vol.33Issue(5)：654-665,12.DOI:10.16032/j.issn.1004-4965.2017.05.009
四川地区7月和8月降水异常空间型及其环流特征
ANALYSIS OF JULY AND AUGUST PRECIPITATION IN SPATIAL DISTRIBUTION PATTERNS AND ASSOCIATED ATMOSPHERIC CIRCULATION CHARACTERISTICS IN SICHUAN
摘要
Abstract
Using the observational monthly precipitation data at 156 stations of Sichuan and ERA-interim monthly reanalysis from 1979 to 2013,we discussed the spatial distribution patterns of precipitation in July and August and the associated large-scale atmospheric circulation characteristics in Sichuan.The results are shown as follows:(1) The principal modes of monthly precipitation anomalies of Sichuan in July and August are consistent distribution,followed by central-east-west oscillation.But the same mode changes in July and August have no continuity;(2) The patterns of circulation which are related to the consistent spatial distribution pattern of different months have significantly different characteristics.With the main atmospheric circulation factors including the Subtropical High (SH) and the circulation in mid-high latitudes of Eurasian continent and the South Asia High (SAH);(3) The intensity and position of key atmospheric circulation factors related to the precipitation anomaly of the consistent spatial distribution pattern in different months have obviously different characteristics.SH is the most eminent one among these factors.The west of SH strengthens and shifts northward and westward slightly in July,while the southwest of SH strengthens and shifts southward and westward obviously in August,inducing the simultaneous monthly rainfall in the whole areas of Sichuan to be more than normal.The northwest of SH strengthens and southwest of SH weakens and shifts eastward and northward obviously in July,while the northwest of SH strengthens and shifts northward and westward obviously in August,leading to the simultaneous monthly rainfall in the whole region of Sichuan to be less than normal.关键词
月尺度降水/环流异常/副高/四川/空间分布型Key words
monthly precipitation/circulation anomalies/subtropical high/Sichuan/spatial distribution pattern分类
天文与地球科学引用本文复制引用
黄小梅,蒋兴文,肖丁木..四川地区7月和8月降水异常空间型及其环流特征[J].热带气象学报,2017,33(5):654-665,12.基金项目
中国气象局预报预测核心业务发展专项项目(CMAHX20160504) （CMAHX20160504）
中国气象局成都高原气象研究所基本科研业务费项目(BROP201514) （BROP201514）
国家自然科学基金项目(91337107、41661144019)共同资助 （91337107、41661144019）
