夏季青藏高原低涡与感热通量的相关分析  

A correlation analysis between Qinghai-Tibet Plateau vortex and sensible heat flux in summer

作　　者：车婧 张春玲 CHE Jing;ZHANG Chun-ling(School of Marine Science,Shanghai Ocean University,Shanghai 201306,China)

机构地区：[1]上海海洋大学海洋科学学院,上海201306

出　　处：《海洋湖沼通报》2021年第4期39-45,共7页Transactions of Oceanology and Limnology

基　　金：国家青年自然科学基金项目(D-8005-17-0180);农业部远洋与极地渔业创新重点实验室开放基金项目(D-8005-18-0059)。

摘　　要：利用1979—2015年1°×1°的ERA-INTERIM再分析资料,以及1982—2012年青藏高原70个测站资料计算得到了地表感热通量数据,首先分析了高原低涡的统计特征和夏季地表感热通量的分布特征,进而探讨了青藏高原夏季低涡活动与地表感热通量强弱的相互关系。结果表明,1979—2015年,夏季(6—8月)高原低涡生成个数大体呈逐年增多的趋势,最多达87个/a,最少为47个/a,集中在西藏那曲、青海玉树以及青海格尔木地区,且大部分低涡活动维持2~3个时次(12~18 h);青藏高原夏季地表感热通量,在20世纪90年代以前南强北弱,而20世纪90年代以后则呈现出南弱北强的分布特征;青藏高原夏季高原低涡活动与感热异常存在明显的负相关关系,地表感热通量异常偏强(弱)时,低涡生成个数偏少(多)。Using 1°×1°ERA-INTERIM reanalysis data collected from 1979 to 2015 and data collected at 70 stations on the Tibetan Plateau from 1982 to 2012,we characterized the surface sensible heat flux and the plateau vortex in summer,and explored the relationship between the summer vortex activity on the Tibetan Plateau and the surface sensible heat flux.The results showed that between 1979 and 2015,the number of plateau vortex in summer(June-August)has been increasing year by year,87/a as the maximum and 47/a as the minimum.The vortex concentrated in Nagqu,Qinghai and Yushu in Qinghai.In the Golmud area of Qinghai,most vortex activities are maintained for 2~3 times,12~18 h each.The surface sensible heat flux of the Tibetan Plateau in summer is weaker in the south and the north before and after 1990 s,which are weak in south area and strong in north area.There is a significant negative correlation between the low vortex activity and the sensible heat anomaly in summer on Tibetan Plateau.When the surface sensible heat flux is abnormally strong(weak),the number of the low vortex is less(many).

关 键 词：夏季青藏高原 高原低涡 感热 统计分析 

分 类 号：P47[天文地球—大气科学及气象学]