地理学报 ›› 1992, Vol. 47 ›› Issue (6): 536-544.doi: 10.11821/xb199206007

• 论文 • 上一篇    下一篇

半干旱区非均匀下垫面对边界层气候影响的数值试验

陈万隆1, 陈宇能2, 陈江 1   

  1. 1. 南京气象学院,210044;
    2. 夏威夷大学气象系
  • 出版日期:1992-11-15 发布日期:1992-11-15
  • 基金资助:

NUMERICAL EXPERIMENT ON THE INFLUENCE OF INHOMO-GENEOUS UNDERLYING SURFACE ON THE BOUNDARY-LAYER CLIMATE IN SEMI-ARID REGION

Chen Wanlong1, Chen Yileng2, Chen Jiang1   

  1. 1. Nanjing Institute of Meteorology, 210044;
    2. Department of Meteorology, University of Hawaii
  • Online:1992-11-15 Published:1992-11-15

摘要: 为了探讨我国北方(39°N,100°E)半干旱地区森林与裸地非均匀下垫面对减轻于旱的作用,本文利用二维β中尺度模式进行了夏季非均匀下垫面对边界层气候影响的数值试验。结果表明,在夏季晴朗静风、无系统扰动条件下,温、湿度为非均匀的下垫面对边界层气候起着决定性的影响。增强的对流运动有利于林区降水的增加。来自林区的湿平流对周围气候的调节可达30—50km。在林区附近裸地进行灌溉,可形成比较冷、湿的环境,有利于干旱的减轻。干燥裸地边界层内的逆湿现象是由于下垫面非均匀的湿度场与中尺度平流的共同作用的结果。

关键词: 非均匀下垫面, 边界层气候, 减轻干旱, 数值试验, 逆湿

Abstract: Using a two-dimensional β-mesoscale model, the numerical experiment about the influ-ence of inhomogeneous surface on the boundary-layer climate in summer was carried out in order to explore the reduction of droughts over the inhomogeneous underlying surface, which is consisted as forest and arid/wet bare land in the semi-arid region of North China (around 39°N, 100°E).

Key words: Inhomogeneous underlying surface, Boundary-Iayer climate, Reduction of drought, Numerical experiment, Humidity inversion