地面以下虚假经向风场对非洲地区局地Hadley环流的影响  

Influence of fake below-ground meridional wind on regional Hadley circulation in Africa

作　　者：成剑波 左冬冬 颜鹏程[1,2] CHENG Jianbo;ZUO Dongdong;YAN Pengcheng(Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,China;Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Key Laboratory of Arid Climatic Change and Reducing Disaster of China Meteorological Administration,Lanzhou 730020,China;School of Environmental Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,Jiangsu,China;School of Mathematics and Physics,Yancheng Institute of Technology,Yancheng 224051,Jiangsu,China)

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃兰州730020 [2]甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点实验室,甘肃兰州730020 [3]盐城工学院环境科学与工程学院,江苏盐城224051 [4]盐城工学院数理学院,江苏盐城224051

出　　处：《干旱气象》2021年第6期900-910,共11页Journal of Arid Meteorology

基　　金：国家自然科学基金项目(42130610、42005012);江苏省自然科学基金项目(BK20201058);中国气象局干旱气象科学研究基金项目(IAM202005);盐城工学院校级科研项目(xjr2020022、xjr2019052)共同资助。

摘　　要：利用热带地区垂直翻转环流分解方法(简称"M1")和全球大气环流三型分解方法(简称"M2"),采用7套再分析资料,分析地面以下虚假经向风场(fake below-ground meridional wind,FBGMW)对非洲大陆地区Hadley环流(Hadley circulation in Africa,AFHC)气候态、年际变率和线性趋势的影响。结果表明:(1)对于气候态而言,FBGMW对AFHC强度、AFHC公共上升支和南北半球下沉支的影响取决于季节和质量流函数计算方法的选取。(2)除了AFHC公共上升支,FBGMW对南北半球AFHC强度、AFHC下沉支位置年际变率的影响很小。不考虑FBGMW会使得M1方法对应的冬季和夏季以及M2方法对应的冬季AFHC公共上升支年际变率减小,M1和M2方法对应的秋季AFHC公共上升支年际变率增加。不考虑FBGMW导致M1方法对应的春季和M2方法对应的春季和夏季AFHC公共上升支年际变率的变化依赖于资料的选取。(3)尽管不考虑FBGMW会导致AFHC强度以及AFHC公共上升支和南北半球下沉支位置线性趋势的数值发生变化,但关于AFHC线性趋势的主要结论未改变。The impacts of fake below-ground meridional wind(FBGMW)on the regional Hadley circulation in Africa(AFHC)in terms of the climatology,interannual variability,and linear trends have been analyzed based on seven reanalysis datasets by using the local partitioning method of the tropical overturning circulation(M1)and the three-pattern decomposition of global atmospheric circulation(M2).The results are as follows:(1)In terms of the climatology,the impacts of FBGMW on the intensity,common rising branch,and sinking branches in both hemispheres of the AFHC depended on the seasons and methods for the calculation of mas stream function.(2)Except for the common rising branch,the FBGMW had small impact on the interannual variability of the intensity of AFHC and the sinking branches location of AFHC in both hemispheres.No-considering FBGMW led to smaller interannual variability of the common rising branch of AFHC in winter and summer based on M1 method and in winter based on M2 Method,and larger interannual variability of the common rising branch of AFHC in autumn based on both methods.With no-considering FBGMW,the change of the interannual variability of the common rising branch of AFHC in spring based on M1 method and in spring and summer based on M2 method depended on the choice of the reanalysis data.(3)Although no-considering FBGMW,it had impact on the quantitative values of the linear trends of the intensity,common rising branch,and sinking branches location in both hemispheres of AFHC,the main conclusions of these linear trends did not change.

关 键 词：地面以下虚假经向风场 非洲地区 局地Hadley环流 气候态 年际变率 线性趋势 

分 类 号：P467[天文地球—大气科学及气象学]