气象科学2024，Vol.44Issue(2)：280-291,12.DOI:10.12306/2022jms.0102
空间分辨率对中国夏季降水时空演变特征的影响
Effect of spatial resolution on the spatial and temporal evolution characteristics of summer precipitation in China
摘要
Abstract
Based on the monthly precipitation observation data of 160 stations of National Climate Center(R160)and 2 314 stations of national surface meteorological observatory(R2314)from 1979-2021,by using EOF decomposition and correlation analysis,the spatio-temporal characteristics of summer precipitation variation and its physical connection with ocean and atmosphere factors were studied respectively,meanwhile the possible reasons were discussed.Results show that the spatio-temporal characteristics of precipitation variation in northwestern China,Tibetan Plateau and other regions are distorted by the leading EOF modes due to their extremely sparse distribution of stations.In addition,its low spatial resolution would lose the signal of variation characteristics in local heavy rainfall and reduce interannual climate variability in the central and eastern China.In contrast,the leading mode of R2314 can reflect the spatio-temporal evolution characteristics of precipitation in China more realistically,especially in the Yangtze-Huaihe Rivers region where extreme precipitation occurs frequently and in the mountainous areas where precipitation is greatly affected by local terrain,the evolution of spatial distribution and the temporal coefficient are more different from those of R160.Moreover,the association between abnormal variation of R2314 and forcing signals such as ENSO,western Pacific subtropical high and Tibetan Plateau snow cover are more significant.关键词
空间分辨率/经验正交函数分解/中国夏季降水/站点资料Key words
spatial resolution/EOF/summer precipitation in China/station data分类
天文与地球科学引用本文复制引用
谢子璜,胡轶佳,朱益民,哈瑶..空间分辨率对中国夏季降水时空演变特征的影响[J].气象科学,2024,44(2):280-291,12.基金项目
国家重点研发计划项目(2023YFC3209301) （2023YFC3209301）
国家自然科学基金资助项目(41975090) （41975090）
湖南省自然科学基金资助项目(2022JJ20043) （2022JJ20043）
