中山大学学报自然科学版 ›› 2017, Vol. 56 ›› Issue (5): 93-100.

• 论文 • 上一篇    下一篇

东亚、北非干旱半干旱区边界层高度变化及其影响因素

赵艳茹,毛文茜,张珂铨,牛笑应,李佳芸,张文煜   

  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
  • 收稿日期:2016-07-23 出版日期:2017-09-25 发布日期:2017-09-25

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

ZHAO Yanru, MAO Wenqian, ZHANG Kequan, NIU Xiaoying, LI Jiayun, ZHANG Wenyu   

  1. College of Atmospheric Sciences∥Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou University, Lanzhou 730000, China
  • Received:2016-07-23 Online:2017-09-25 Published:2017-09-25

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。

关键词: 干旱半干旱区, 边界层高度, 变化, 气象因素

Abstract:

Based on the ECMWF's first atmospheric reanalysis data of the 20th Century, ERA-20C , 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/10a, while the BLH of North Africa showed a decreasing trend with a climate tendency rate of -2.13 m/10a. 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.

Key words: arid and semiarid areas, boundary layer height, variation characteristics, meteorological factors

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