大气科学2012，Vol.36Issue(5)：959-973,15.DOI:10.3878/j.issn.1006-9895.2012.11167
东北冷涡活动的季节内振荡特征及其影响
Characteristics of the Northeast Cold Vortexat Intraseasonal Time Scale and Its Impact
摘要
Abstract
The Northeast Cold Vortex (NECV) is a major synoptic system that causes chilling damage, sustained rainfall and sudden severe convective storms over Northeast China. By using the National Centers of Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis data and high resolution gridded precipitation data over China provided by the Chinese Academy of Meteorological Sciences, an objective index of the NECV (NECVI) is defined, and then the characteristics of the northeast cold vortex activities on intraseasonal timescale and its relationship with the circulation and rainfall are investigated. Results show that the activities of the NECV exhibit remarkable 10-30-day oscillation. The 10-30-day oscillation of atmosphere circulation associated with the NECV activities obviously locks with the precipitation anomalies over eastern China, and modulates the locations of anomalous rain belts. The anomalous rain belts over eastern China shift from north to south along with the northwest-southeast movements of the NECV and associated low frequency circulation. Moreover, the relationship between the 10-30-day activities of the NECV and the atmospheric teleconnection patterns in mid-high latitudes is discussed. The low frequency circulation associated with the NECV is one part of the Eurasian (EU) pattern teleconection-like wave train in summer. The EU wave train converges with the East Asian-Pacific (EAP) pattern teleconnetion-like wave train in eastern Asia. The interaction between them affects the velocity and direction of low frequency system related with the NECV, and further determines the location and duration of precipitation over eastern China. Therefore, the preceding development of the low frequency wave trains of EU pattern and EAP pattern might indicate the following stage of rainfall over eastern China. This study will provide a reference for the 10-30-day extended-range weather forecast of severe precipitation over eastern China.关键词
东北冷涡/季节内振荡/中国东部降水Key words
northeast cold vortex, intraseasonal oscillation, precipitation over eastern China分类
天文与地球科学引用本文复制引用
刘慧斌,温敏,何金海,张人禾..东北冷涡活动的季节内振荡特征及其影响[J].大气科学,2012,36(5):959-973,15.基金项目
国家重点基础研究发展计划项目(973)2012CB417205,国家公益性行业(气象)专项GYHY200906017,国家自然科学基金资助项目40921003,中国气象科学研究院基本科研业务费2010Z003 （973）
