doi:  10.3878/j.issn.1006-9895.1603.15278
春季欧亚-北太平洋上空大气质量迁移规律及其对中国同期气候异常的可能影响

Migration of Atmospheric Mass over Regions between Eurasia and North Pacific in Spring and Its Possible Impacts on Climate Anomalies in China
摘要点击 469  全文点击 610  投稿时间:2015-09-25  
查看HTML全文  查看全文  查看/发表评论  下载PDF阅读器
基金:  国家自然科学基金项目41175062,公益性行业(气象)科研专项GYHY201406024
中文关键词:  大气质量迁移  欧亚-北太平洋遥相关  气候异常  春季  中国
英文关键词:  Migration of atmospheric mass  Eurasia-North Pacific teleconnection pattern  Climate anomalies  Spring  China
           
作者中文名作者英文名单位
奚子惠XI Zihui南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044;南京信息工程大学气象灾害教育部重点实验室, 南京 210044;江苏省海洋环境监测预报中心, 南京 210036
管兆勇GUAN Zhaoyong南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044;南京信息工程大学气象灾害教育部重点实验室, 南京 210044
张茜ZHANG Qian南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044;南京信息工程大学气象灾害教育部重点实验室, 南京 210044
陈丹萍CHEN Danping南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044;南京信息工程大学气象灾害教育部重点实验室, 南京 210044
引用:奚子惠,管兆勇,张茜,陈丹萍.2016.春季欧亚-北太平洋上空大气质量迁移规律及其对中国同期气候异常的可能影响[J].大气科学,40(6):1261-1272,doi:10.3878/j.issn.1006-9895.1603.15278.
Citation:XI Zihui,GUAN Zhaoyong,ZHANG Qian,CHEN Danping.2016.Migration of Atmospheric Mass over Regions between Eurasia and North Pacific in Spring and Its Possible Impacts on Climate Anomalies in China[J].Chinese Journal of Atmospheric Sciences (in Chinese),40(6):1261-1272,doi:10.3878/j.issn.1006-9895.1603.15278.
中文摘要:
      利用1979~2013年NCEP/NCAR月平均再分析资料及NOAA研究中心的CMAP(CPC Merged Analysis of Precipitation)月平均降水资料,通过定义欧亚—北太平洋间大气质量迁移指数IMAMEP,分析了春季欧亚—北太平洋上空大气质量迁移(MAMEP,Migration of Atmospheric Mass over Regions between Eurasia and North Pacific)的年际变化规律及其与同期中国气候异常的联系。结果表明:在北半球中高纬度存在一个纬向分布的欧亚—北太平洋遥相关型,且其可能对中国同期气候异常的形成具有重要影响。春季MAMEP指数具有显著的长期趋势,同时还具有2~4年及5~7年的振荡周期及明显的年代际变化特征。垂直环流和波动运动对欧亚—北太平洋间大气质量迁移具有重要作用。大气质量在欧亚西部低层异常辐合,高层异常辐散,在中、西太平洋地区低层异常辐散,高层异常辐合,在纬向上构成了顺时针的垂直环流圈,将西北太平洋地区的大气质量变动与欧亚大陆上空的变动联系了起来。另外,来自西欧大陆的波扰能量可传播至北太平洋,有利于这些区域上空位势高度异常扰动的维持。IMAMEP与春季同期降水及地表气温异常关系密切。IMAMEP为正时,东亚以北地区、鄂霍次克海西岸以及西欧沿岸降水显著减少,欧亚西部及我国华北地区降水显著增加。850 hPa上西伯利亚受反气旋式环流控制,太平洋上空受气旋式环流控制,引起欧亚大陆北部地表显著增温,西伯利亚以东、我国东北、华北—江淮地区及韩国、日本南部地表显著降温。西欧—我国西北部分地区大面积显著降温现象与这两个地区受异常反气旋东侧的偏北气流影响有关。这些结果有利于人们更深刻认识区域春季气候异常形成机理。
Abstract:
      Using the NCEP/NCAR monthly mean reanalysis and CMAP (CPC Merged Analysis of Precipitation) precipitation data for the period from 1979 to 2013,the authors define an index of the Migration of Atmospheric Mass over Regions between Eurasia and North Pacific (IMAMEP) to investigate the interannual variability of spring MAMEP and its impacts on climate anomalies over China.Our results demonstrate that spring MAMEP is mainly characterized by a seesaw-like structure in surface air pressure anomalies,which can also be referred to as Eurasia-North Pacific teleconnection pattern.The IMAMEP varies with a remarkable long-term trend and periodicities of 2-4 years and 5-7 years as well as distinct interdecadal changes.It is found that an anomalous vertical circulation behaves like a bridge linking Eurasia and North Pacific with the migration of atmospheric mass between these two regions.The atmospheric mass fluxes anomalously converge in the lower troposphere and diverge in the upper troposphere in the west of Eurasia.However,the opposite situations are observed in the western and central Pacific.The wave activity fluxes show that the wave energy propagates eastward from western Europe into the North Pacific,facilitating the maintenance of the anomalous geopotential height disturbances there.In the spring,the IMAMEP is highly correlated with anomalous rainfall and surface air temperature over China.When the IMAMEP is positive,precipitation decreases significantly over the north of East Asia,the west of Okhotsk Sea,and the coastal western Europe,as opposed to the increase over the west of Eurasia and the north of China.The anticyclonic circulation in Siberia and the cyclonic circulation in North Pacific in the lower troposphere induce the anomalously high surface air temperature in northern Eurasia,along with the anomalously low temperature in the east of Siberia,Northeast China,North China,Yangtze-Huaihe River valley,Korea,and the south of Japan.The surface air temperature anomalously decreases in much of western Europe and northwestern China.These results are helpful for us to better understand the formation mechanisms for anomalous climate conditions in Eurasia and North Pacific regions in boreal spring.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
联系电话: 010-82995051,010-82995052传真:010-82995052 邮编:100029 Email:dqkx@mail.iap.ac.cn
本系统由北京勤云科技发展有限公司设计
京ICP备09060247号