首页|Analysis of Summer Cold Vortex Activity Anomalies in Northeastern China and Their Relationship with Regional Precipitation and Temperature

Analysis of Summer Cold Vortex Activity Anomalies in Northeastern China and Their Relationship with Regional Precipitation and Temperature

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The Northeastern China cold vortex(NCCV)is one type of strong cyclonic vortex that occurs near Northeastern China(NEC),and NCCV activities are typically accompanied by a series of hazardous weather.This paper employed an automatic algorithm to identify the NCCVs from 1979 to 2018 and analyzed their circulation patterns and climatic impacts by using the defined NCCV intensity index(NCCVI).The analysis revealed that the NCCV activities in summer exhibited a strong inter-annual variability,with an obvious periodicity of 3-4 years and 6-7 years,but without significant trends.In years when the NCCVI was high,NEC experienced negative geopotential height anomalies,cyclonic circulation,and cooler temperature anomalies,which were conducive to the maintenance and development of NCCV activities.Furthermore,large amounts of water vapor converged in NEC through two transportation routes as the NCCVs intensified,leading to a significant positive(negative)correlation with the summer precipitation(surface temperature)in NEC.The Atlantic sea surface temperature(SST)anomalies were closely related to summer NCCV activities.As the Atlantic SST rose,large amounts of surface sensible and latent heat flux were transported into the lower troposphere,inducing a positive geopotential height anomaly that occurred on the east side of the heat source.As a result,an eastward diverging flow was formed in the upper troposphere and propagated downstream,i.e.,the eastward propagating Rossby wave train,which eventually led to a coupled circulation in the Ural Mountains and NEC,as well as more intensive NCCV activities in summer.

Northeastern China cold vortex(NCCV)anomalyclimatic effectsprecipitationsurface temperaturedevelopment mechanisms

孔阳、卢楚翰、李凯丽、沈逸辰

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Key Laboratory of Meteorological Disaster,Ministry of Education,Nanjing University of Information Science and Technology,Nanjing 210044 China

Key Laboratory of Ecosystem Carbon Source and Sink,China Meteorological Administration(ECSS-CMA),Wuxi University,Wuxi,Jiangsu 214063 China

Nanjing Zhongke Huaxing Academy of Emergency Science and Technology,Nanjing 210032 China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaWuxi University Research Startup Fund for Introduced TalentsQinglan Project of Jiangsu Province for DING Liuguan"333"Project of Jiangsu Province for DING Liuguan

41975073422742152023r037

2024

10.3724/j.1006-8775.2024.016

热带气象学报(英文版)
中国气象局广州热带海洋气象研究所

热带气象学报(英文版)

影响因子：0.169
ISSN：1006-8775
年,卷(期)：2024.30(2)