太阳活动对夏季大气环流异常及云南降水的影响  

Impacts of Solar Activities on Abnormality of General Circulation and Yunnan Rainfall in Summer

作　　者：段长春[1] 

机构地区：[1]云南省气象科学研究所,云南昆明650034

出　　处：《高原山地气象研究》2008年第3期37-43,共7页Plateau and Mountain Meteorology Research

基　　金：国家自然科学基金项目(40475040)

摘　　要：利用1948～2005年太阳10．7cm射电流量资料，采用小波分析、相关合成分析方法对太阳活动与夏季大气环流异常的联系进行了初步的研究，分析了太阳活动对云南夏季降水的影响。研究表明：太阳活动有明显的年际和年代际变化特征，太阳流量特征时间尺度分别约为11年、22年；太阳活动与夏季中高层大气环流异常有十分明显的联系；太阳活动强弱年的大气环流存在显著差异：太阳活动峰值年，南亚高压异常强大，高压脊线偏南，副高表现出明显的偏强偏西；而太阳活动谷值年，南亚高压较弱，高压脊线偏北，副高表现出明显的偏弱偏东。进一步对太阳活动与异常风场的联系进行了分析，得出显著相关区主要位于中高纬，索马里附近为一显著正相关区。太阳活动峰值年，东亚地区西风急流异常偏南偏强，热带季风环流加强，梅雨锋区环流偏弱（夏季风环流加强）；太阳活动谷值年，东亚地区西风急流异常偏北偏弱，热带季风环流偏弱，梅雨锋区环流加强（夏季风环流偏弱）。云南夏季降水与太阳10．7cm流量在年代际尺度上有很好的对应关系，初夏、汛期降水分别有与太阳活动相关的11、20-24年明显周期。滇南、滇西北初夏5月的降水与太阳活动有一定的正相关关系，太阳活动强时，5月降水越多，太阳活动弱时，5月降水越少。Based on the 10.7cm Solar Flux data for 1948 - 2005 and the NCEP/NCAR reanalysis data （ 2.5°× 2.5° ）, this paper analyzes the impact of solar activities on abnormality of atmospheric general Circulation in Summer with the methods of wavelet and correlation analysis. The main results show that the 10.7cm Solar Flux has the interannual and interdecadal variations and has main oscillation periods of quasi - 11, 22, 42 years ; solar activities have notable influence on summer middle - and high - level atmospheric circulation. Comparisons of the circulation differences of the solar activity anomalous years show that when solar activity is high, the intensity of South Asian High is too strong and its position is far southward ; and the intensity of the western Pacific subtropical high is stronger and its position is far westward in comparison with normal condition. While solar activity is low, the intensity of South Asian High is weaker and its position is far northward; and the intensity of the western Pacific Subtropical High is weaker and its position is far eastward. Moreover, the relationship of solar activities and the wind abnormality at 200hPa and 850 hPa has been investigated. The results show that anomalous strong （weak） solar activity is related to the EAWJP （ East Asian Westerly Jet Position） moved Southward （ Northward ） than normal as well as the EAWJI is stronger （ weaker ） than normal, which means East Asian summer monsoon circulation at 850hPa is stronger （weaker）.

关 键 词：太阳活动 夏季大气环流 南亚高压 西太平洋副高 东亚西风急流 云南夏季降水 

分 类 号：P426.6[天文地球—大气科学及气象学]