东亚、北非干旱半干旱区边界层高度变化及其影响因素  

The boundary layer height variation and influence factors over arid and semiarid areas of East Asia and North Africa

作　　者：赵艳茹 毛文茜 张珂铨 牛笑应 李佳芸[1] 张文煜[1] ZHAO Yanru MAO Wenqian ZHANG Kequan NIU Xiaoying LI Jiayun ZHANG Wenyu(College of Atmospheric Sciences//Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou University, Lanzhou 730000, Chin)

机构地区：[1]兰州大学大气科学学院∥甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730000

出　　处：《中山大学学报（自然科学版）》2017年第5期93-100,共8页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家重大科学研究计划项目(2012CB956200);国家自然科学基金(41225018);兰州大学中央高校基本科研业务费专项资金(lzujbky-2016-193)

摘　　要：利用欧洲中期天气预报中心ECMWF(European Centre for Medium-Range Weather Forecasting)20世纪第一代再分析资料ERA-20C(the ECMWF twentieth century reanalysis)对东亚、北非2个典型干旱半干旱区1900-2010年边界层高度变化及其与气象要素变化之间联系进行了研究,结果表明:(1)两个地区的边界层高度在整体变化、年际变化以及年代际变化中基本呈现出相反的变化趋势,整体趋势中东亚为显著上升趋势,气候倾向率为1.87 m/10a,北非为显著下降趋势,气候倾向率为-2.13 m/10a;在11个年代里,有8个年代的变化呈相反趋势。(2)干旱半干旱区边界层高度的变化均与地气温差、相对湿度、风速的变化有一定联系,其中相对湿度与边界层高度的变化最为紧密,在两个地区均为显著性的负相关,相关系数分别为-0.778 4、-0.618 4。Based on the ECMWF＇ s first atmospheric reanalysis data of the 20th Century,ERA-20 C,the variation of the boundary-layer height（BLH） and its relationship with the meteorological factors over arid and semiarid areas of East Asia and North Africa spanning 1900-2010 were analyzed.The BLHs in the two areas showed an opposite trend in the overall,interannual and interdecadal variation.The BLH of East Asia overall showed a rising trend with a climate tendency rate of 1.87 m/10 a,while the BLH of North Africa showed a decreasing trend with a climate tendency rate of -2.13 m/10 a.In the 11 decades,there were 8 decades having opposite trend.The BLH was related to the change of land air temperature gradient,relative humidity and wind speed.The change of relative humidity had a good correlation with the BLH,with significant negative correlation coefficients of -0.778 4 and -0.618 4,respectively,in East Asia and North Africa.

关 键 词：干旱半干旱区 边界层高度 变化 气象因素 

分 类 号：P433[天文地球—大气科学及气象学]