| 摘要: |
| 利用贵州76个测站1961-2017年秋季（9-11月）逐日雨量和美国国家环境预报中心/大气研究中心（NCEP/NCAR）再分析资料，借助线性趋势、Mann-Kendall检验、Morlet小波变换、合成分析等方法，对贵州秋季绵雨时空变化及同期环流特征进行了分析。结果表明：近60年贵州秋季绵雨量和绵雨日数呈线性减少趋势，小雨对绵雨贡献率最大，绵雨日数存在2年左右的显著周期；11月绵雨日数突变发生在1986年前后，1961-1986年为偏多时段，1987-2017年为偏少时段。贵州秋季绵雨从西、西北向东、东南呈递减分布。乌拉尔山高压脊、东亚大槽、极涡和西太平洋副热带高压以及低纬暖湿气流向北输送是造成贵州秋季绵雨强弱的主要影响系统。 |
| 关键词: 秋季绵雨；时空变化；环流 |
| DOI： |
| 投稿时间：2018-08-06修订日期：2019-04-01 |
| 基金项目: |
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| Temporal and Spatial Variations of Autumn Continous Rainy Days in Guizhou and Characteristics of Circulation in the Same Period |
| Chen Jing |
| (Climate Center of Guizhou Province) |
| Abstract: |
| Based on the daily rainfall of 76 weather station in Guizhou during the 1961-2017 autumn (September-November) and the National Centers for Environmental Prediction/ the National Center for Atmospheric Research (NCEP/NCAR) reanalysis data, analysed the temporal and spatial variations of autumn continous rainy days in guizhou and characteristics of circulation in the same period by the methods of linear trend, Mann-Kendall test, Morlet wavelet transform and synthetic analysis. The results show that in the past 60 years, the rainfall and amount of autumn continous rainy days in Guizhou decreased linearly. The contribution of light rain to the autumn continous rain was the largest, and the amount of autumn continous rainy days had a significant period of about 2 years. A Mutation of the amount of autumn continous rainy days in November occurred around 1986, and from 1961 to 1986, it was a period of more rainfall, and from 1987 to 2017, it was a period of less rainfall. The autumn continous rainy days in Guizhou are decreasing from west or northwest to east or southeast. The Ural mountain high pressure ridge, the East Asia major trough, the polar vortex and the western Pacific subtropical high, and the low latitude warm and wet air flow to the north are the main influence systems for the strength of autumn continous rainy days in Guizhou. |
| Key words: Autumn continous rainy days; Temporal and spatial variations; Atmospheric circulation |
