气象与环境学报2026，Vol.42Issue(3)：22-32,11.DOI:10.3969/j.issn.1673-503X.2026.03.003
松花江流域作物生长季降水的季节内振荡特征分析
Analysis of intraseasonal oscillation characteristics of crop growing season precipitation in the Songhua River basin
摘要
Abstract
Using high-resolution gridded daily precipitation data derived from observations at 2416 meteorological stations across China during 1961-2023,daily NCEP/NCAR reanalysis data and daily NOAA outgoing longwave radiation(OLR)data,this paper analyzes the 10-30-day intra seasonal oscillation(ISO)of precipitation of precip-itation in the crop growing season(May-September)over the Songhua River Basin,and explores the mechanisms responsible for the basin-scale dominant precipitation mode and its active ISO events.The results show that at 200 hPa in the troposphere,a 10-30-day Eurasian teleconnection patttern(EU)of vorticity anomalies propagates eastward across mid-high latitudes from Western Europe to the Northwest Pacific,modulating anomalous atmos-pheric circulation over the Songhua River Basin.During the wet phase of intraseasonal precipitation anomalies in the basin,positive vorticity advection occurs over the Songhua River Basin together with upper-tropospheric diver-gence.The negative vorticity anomaly center above the basin is connected to that over the Tibetan Plateau,which stretches the bottom of the anomalous low-level cyclonic circulation over the basin southwestward to form a long and narrow shear zone.Warm and moist air originating from the Bay of Bengal,the South China Sea and tropical western Pacific are transported northward to the Songhua River Basin by southwesterly winds ahead of the shear line,thereby enhancing precipitation.In contrast,precipitation decreases when the two upper-level positive vorticity centers are linked.Therefore,the mid-high-latitude anomalous EU plays a crucial modulating role in the intrasea-sonal variability of precipitation over the Songhua River Basin throughout the crop growing season.关键词
松花江流域/作物生长季降水/季节内振荡/欧亚遥相关型Key words
Songhua River Basin/Crop growing season precipitation/Intraseasonal oscillation/EU分类
天文与地球科学引用本文复制引用
王昊,宋成玉,班晋,赵佳莹,李永生..松花江流域作物生长季降水的季节内振荡特征分析[J].气象与环境学报,2026,42(3):22-32,11.基金项目
中国气象局气象能力提升联合研究专项(22NLTSY001)、黑龙江省自然科学基金(LH202D022)和中国气象局创新发展专项(CXFZ2025J021)共同资助. （22NLTSY001）
