###
气象:2022,48(3):324-333
本文二维码信息
码上扫一扫!
初夏东北移高原低涡活动特征
孙芳,周顺武,王美蓉,马淑俊,周庶,黄雨婧
(南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/资料同化研究与应用中心,南京 210044; 拉萨市气象局,拉萨 850011)
Activity Characteristics of the Northeast-Moving Tibetan Plateau Vortices in Early Summer
SUN Fang,ZHOU Shunwu,WANG Meirong,MA Shujun,ZHOU Shu,HUANG Yujing
(Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044; Lhasa Municipal Meteorological Bureau, Lhasa 850011)
摘要
图/表
参考文献
相似文献
本文已被:浏览 338次   下载 1375
投稿时间:2021-07-24    修订日期:2021-11-15
中文摘要: 高原低涡是青藏高原(简称高原)的主要降水系统,其移出高原后,往往会在高原下游地区造成大到暴雨甚至大暴雨。低涡移出高原后的移动方向主要有东移、东北移等。本文基于1979—2018年高原低涡数据库,选取初夏(6月)东北移低涡为研究对象,依据其移出位置,将其分为偏西型低涡(简称Ⅰ类低涡)和偏东型低涡(简称Ⅱ类低涡),对两类东北移低涡的源地、结构、环流及其对降水的影响等方面进行了统计分析,并与东移低涡进行了对比。结果表明:东北移低涡源地较东移低涡偏北,Ⅰ类低涡主要生成于高原西北部,而Ⅱ类低涡存在3个主要源地。移出高原后,Ⅰ类低涡最大上升运动主要出现在低涡东北侧,而Ⅱ类低涡同东移低涡相似,上升区主要位于低涡东南侧。低涡在高原上的移动方向及移出位置主要受到200 hPa 中纬度引导气流的影响,移出高原后的移动方向则主要受500 hPa高原以东槽脊的影响,其中河套高压脊对东北移低涡的阻挡作用尤为重要。低涡移动速度受海拔高度差和移动方向的共同影响,移出高原前Ⅱ类低涡与东移低涡移动速度明显快于Ⅰ类低涡;移出高原后两类东北移低涡平均移动速度较东移低涡更慢。Ⅰ类低涡移出后主要影响河西走廊地区,且降水以小雨为主;Ⅱ类低涡主要影响西北地区东部,其中近七成的低涡会引起大到暴雨。
Abstract:The Tibetan Plateau vortex (TPV) is the main precipitation system on the Tibetan Plateau (TP). It often causes heavy rain, torrential rain or even heavy rainstorms in the lower reaches of the TP. After TPV moves off the TP, its moving path is mainly divided into east moving (E-TPV), northeast moving (NE-TPV) and so on. Based on the database of TPV from 1979 to 2018, this paper selects the NE-TPV in early summer (June) as the research object. According to its moving-off position, NE-TPV is divided into the westward vortex (denoted as NEI-TPV) and the eastward vortex (denoted as NEⅡ-TPV). In terms of the source, structure, circulation and influence on precipitation, the two types of NE-TPV are statistically analyzed and compared with the E-TPV. The results show that the source of the NE-TPV is more northerly than the E-TPV. NEⅠ-TPV is mainly generated in the northwestern part of the TP and NEⅡ-TPV is mainly generated in three relatively concentrated areas. After moving off the TP, the maximum ascending region of NEⅠ-TPV is located on the northeast side of the vortex, while the NEⅡ-TPV is similar to the E-TPV with its ascending area mainly located on the southeast side of the vortex. The moving direction and position of the TPV before it moves off are mainly affected by the westerly fluctuations at 200 hPa, and the moving direction after it moves off is mainly affected by the troughs and ridges at 500 hPa in the east of the TP. Among these troughs and ridges, the Hetao high pressure ridge is particularly important in blocking the NE-TPV. The moving speed of the TPV is jointly affected by the altitude difference and its moving direction. The TPV moving eastward often has a faster moving speed. After the NEⅠ-TPV moves off the TP, it mainly affects the Hexi Corridor Area, and the precipitation is dominated by light rain. NEⅡ-TPV mainly affects the eastern part of the northwestern China and nearly 70% of it will cause heavy rain or torrential rain.
文章编号:     中图分类号:    文献标志码:
基金项目:国家自然科学基金重点项目(42030611)、国家自然科学基金项目(42165005)和国家重点研发计划(2018YFC1505705)共同资助
Author NameAffiliation
SUN Fang Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044 
ZHOU Shunwu Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044 
WANG Meirong Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044 
MA Shujun Lhasa Municipal Meteorological Bureau, Lhasa 850011 
ZHOU Shu Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044 
HUANG Yujing Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science and Technology, Nanjing 210044 
引用文本:
孙芳,周顺武,王美蓉,马淑俊,周庶,黄雨婧,2022.初夏东北移高原低涡活动特征[J].气象,48(3):324-333.
SUN Fang,ZHOU Shunwu,WANG Meirong,MA Shujun,ZHOU Shu,HUANG Yujing,2022.Activity Characteristics of the Northeast-Moving Tibetan Plateau Vortices in Early Summer[J].Meteor Mon,48(3):324-333.