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引用本文:严小冬,宋燕,夏阳,龙园,杨春艳.2017.贵州省秋季雨日时空变化及其与大气环流的关系.气象,43(9):1064-1072.
贵州省秋季雨日时空变化及其与大气环流的关系
Spatio Temporal Variation of Autumn Rainy Days over Guizhou Province and Its Correlation with Atmospheric Circulation
投稿时间:2016-03-07  最后修改时间:2017-05-10
DOI:10.7519/j.issn.1000-0526.2017.09.004
中文关键词: 秋季雨日,时空变化,大气环流
英文关键词: autumn rainy days, spatio temporal variation, atmospheric circulation
基金项目:国家自然科学基金面上项目(41575091)、中国清洁发展机制基金赠款项目(2013031)、黔科合院士站(20144010)和中国气象局气候变化专项(CCSF201708)共同资助
作者单位
严小冬 贵州省气候中心贵阳 550002;中国气象局气象干部培训学院北京 100081 
宋燕 中国气象局气象干部培训学院北京 100081 
夏阳 贵州省六盘水市气象局六盘水 553000 
龙园 贵州省六盘水市气象局六盘水 553000 
杨春艳 贵州省六盘水市气象局六盘水 553000 
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中文摘要:
      利用贵州省81站1964—2013年秋季(9—11月)雨日数及美国国家环境预报中心/大气研究中心(NCEP/NCAR)再分析资料,借助Morlet小波、合成分析等相关诊断方法,对贵州省秋季雨日数时空特征及其与大气环流的关系进行了分析。结果表明:贵州省秋季雨日数分布由东南部向西北部逐渐增多,一般在30.0~52.3 d。近50年秋季全省平均雨日数为40.5 d,总体呈减少趋势,每10年雨日数减少1.9 d。秋季雨日数突变发生在1987年前后,1964—1987年为偏多时段,1988—2013年为偏少时段,其中1997年以后减少趋势最为明显。近50年贵州秋季雨日序列存在准5 a和2~3 a的振荡周期,其中准5 a振荡最为显著。当贵州秋季雨日异常偏多时,南海上空的水汽通量在贵州地区辐合抬升,来自低纬地区的暖湿空气输送更加活跃,东亚大槽偏强,低纬度地区槽脊略有加深,贵州处于印缅槽前,偏南气流强盛,从而有利于冷、暖空气在贵州地区交汇,形成阴雨天气,造成贵州秋季雨日数异常偏多;反之亦然。
英文摘要:
      Based on autumn (September to November) rainy days of 81 stations in Guizhou from 1964 to 2013 and National Center for Environmental Prediction/Atmospheric Research Center (NCEP/NCAR) reanalysis data, the spatio temporal variation of autumn rainy days in Guizhou and its relation with atmospheric circulation were analyzed with Morlet wavelet and synthetic analysis, and other ways. The results show that the autumn rainy days in Guizhou are increased gradually from southeast to northwest between 30.0 d and 52.3 d. Mean autumn rainy days in Guizhou are about 40.5 d. There is the decreasing trend of autumn rainy days in the past 50 years, and its regression coefficient is -1.9 d/10 a. There is an abrupt change around 1987 for the autumn rainy days, which are more than normal in 1964-1987 but less than normal in 1988-2013. Since 1997, the decreasing trend is the most obvious. The autumn rainy days in the past 50 years have obviously quasi 5 year and 2-3 year oscillation periods over Guizhou, of which the 5 year oscillation is the most obvious, 2-3 year periodic oscillation is the second. At the same time, when the autumn rainy days are more over Guizhou, the South China Sea water vapor flux converges, the cold air activity is more active in the high latitudes, the East Asian trough is strong and the trough and ridge over the low latitudes deepen slightly, Guizhou lies in front of the India Burma trough and, the strong southern airflow is in favor of the intersection of warm and cold airs, thus creating the frequent rainy weather; and vice versa.
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