摘要
为对云贵高原雨季降水的时空变化特征进行分析,利用云贵高原68个站点1962-2017年5-10月逐日降水量资料,并采用一元线性回归、EOF分解以及Morlet小波法等多种方法。研究结果表明:云贵高原雨季平均降水量的空间分布呈西北部向东部和南部递增。EOF分解得到,云贵高原雨季降水分布呈现为全局一致性和东北-西南差异型,降水量逐旬变化呈现单峰型,月降水量整体呈东北向西南递增的分布,高值区位于云贵高原的东南部和西南部。近56年来,云贵高原雨季降水量和降水日数呈现波动减少趋势,高原东部的雨季降水量呈现增长趋势。大雨日数呈现减少趋势,暴雨日数呈现增长趋势。雨季降水量存在着28年的显著振荡周期和15年、10年次振荡周期。
In order to analyze the Temporal and spatial characteristics of the precipitation in the rainy season in the Yunnan-Guizhou Plateau,we have used the daily average precipitation of 68 stations in the Yunnan-Guizhou Plateau from May to October from 1962 to 2017 and a variety of climate statistical methods such as univariate linear regression,EOF decomposition,Morlet wavelet method and so on.The results show that:The spatial distribution of the average precipitation has an increasing trend during the rainy season in the Yunnan-Guizhou Plateau increases from the northwest to the east and south.According to EOF,the spatial distribution of precipitation has two typical models:the whole region version or Northeast-Southwest difference version.During the rainy season,the monthly variation precipitation of the Yunnan-Guizhou Plateau has a single peak.The distribution of monthly precipitation has been demonstrated to increase from northeast to southwest,the high-value area is located in the southeast and southwest of the Yunnan-Guizhou plateau.In the past 56 years,the overall precipitation and precipitation days shows a decreasing trend of volatility,only the precipitation in the rainy season in the eastern part of the plateau shows an increasing trend.The number of heavy rain days on the Yunnan-Guizhou Plateau shows a decreasing trend,while the number of rainstorm days shows an increasing trend.Precipitation in the rainy season has significant oscillation periods of 28 years and 15-year,10-year oscillation periods.
作者
薛媛
毛文书
张涵斌
巩远发
XUE Yuan;MAO Wenshu;ZHANG Hanbin;GONG Yuanfa(College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089,China)
出处
《成都信息工程大学学报》
2020年第5期566-572,共7页
Journal of Chengdu University of Information Technology
基金
国家自然科学基金资助项目(41605082)
国家自然科学基金资助项目(41775079)
关键词
大气科学
气象学
云贵高原
雨季降水
EOF
Morlet小波分析法
atmospheric science
meteorology
the Yunnan-Guizhou Plateau
rainy season precipitation
EOF
Morlet wavelet analysis
