J4 ›› 2009, Vol. 27 ›› Issue (4): 334-339.

• 论文 • 上一篇    下一篇

大理雨季开始期演变及异常环流特征分析

高志伟1,2李建美钟爱华陈红玉1,2   

  1. (1.云南大学大气科学系,云南 昆明 650091; 2.云南省大理州气象局,云南 大理 671000)
  • 收稿日期:2009-10-09 修回日期:2009-10-29 出版日期:2010-12-30 发布日期:2009-12-30
  • 作者简介:高志伟(1973-),男,硕士研究生,主要从事天气气候分析预测.E-mai:l apeng_d@l sina. com
  • 基金资助:

    云南省气象局2008年“短平快”科研项目(D200808)资助
     

Characteristics ofEvolution and Anomalous C irculation Analysis on the Beginning of the Rainy Season in Dali ofYunnan Province

 GAO Zhi-Wei1,2, LI Jian-Mei,2 ZHONG Ai-Hua2, CHEN Gong-Yu1,2   

  1. (1.Department ofAtmospheric Sciences, Yunnan University, Kunming650091, China;2. DaliMeteorologicalBureau ofYunnan Province, Dali671000, China)
  • Received:2009-10-09 Revised:2009-10-29 Online:2010-12-30 Published:2009-12-30

摘要:

 利用云南省大理州12个气象站1962~2008年共47 a雨季开始期资料及NCEP/NCAR高度场及风场资料分析了大理雨季开始期的时空分布特征及异常年环流特征。EOF分析表明,大理雨季开始期存在多种空间分布类型,主要的分布型是一致偏早(晚)型及东南—西北型。Morlet小波分析表明,大理雨季开始期在20世纪60年代初到70年代中期偏早, 70年代中期至90年代初偏晚, 90年代初至今偏早;且存在约2 a和10 a的特征时间周期变化。异常偏早年5月高度距平场上北半球经向上呈“-+-”的分布,异常偏晚年则相反,呈“+-+”的分布。异常年5月高、中低层的距平风场同样存在明显差异,异常偏早年高层存在增强伊朗高压的反气旋环流,低层存在偏强的南亚季风环流,异常偏晚年则是相反的环流特征。

关键词: 雨季开始期, 演变规律, 环流特征

Abstract:

The data of the beginning of the rainy season of12 weather stations in Dali from 1962 to 2008 and height,wind fields from
NCEP/NCAR were used to analyze the characteristics of spatial and temporaldistribution and anomalous circulation on the beginning of
the rainy season in Dal.i The results ofEOF analysis indicates that there are severalkinds of spatialpatterns about the beginning of the
rainy season in Dal,i and themajor patterns are the earlier(or later) in thewhole area and the southeast-northwestpattern. The results from Morletwavelet transform shows that the beginning of the rainy season there was earlier from the1960s to the middle of the 1970s and later from themiddle of the 1970s to the 1990s then earlierafter the 1990s. Italso shows that the beginning of the rainy season presented periodic variation of 2 and 10 years. It is a“-+-”distribution alongmeridionalover theNorthernHemisphere in the height departure field inMay of the earlieryears of rainy season, buta“+-+”distribution inMay of the lateryears of rainy season.It is obviously differentofwind departure field atupperand lower level in anomalous years of the beginning of rainy season. There is an anticyclonic circulation to strengthen the Iran high at the upper level and a strongerSouthAsiamonsoon circulation in the earlier years of rainy season, but it is the opposite circulation in the later years of rainy season.

Key words: the beginning of the rainy season, spatial and temporal evolution, circulation characteristics

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