西北中部半干旱区兴隆山森林岛降水机理的数值模拟

陈磊;田文寿;黄倩;黄建平;王婵;孙兰东

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高原气象
高原气象 ›› 2012, Vol. 31 ›› Issue (4) : 885-899.
论文

西北中部半干旱区兴隆山森林岛降水机理的数值模拟

  • 陈磊;田文寿;黄倩;黄建平;王婵;孙兰东
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Numerical Simulation of Precipitation Mechanisms for an Isolated Forest Mountain Area in Semi-Arid Region of Middle of Northwest China

  • CHEN Lei-;TIAN Wen-Shou-;HUANG Qian-;HUANG Jian-Ping-;WANG Chan-;SUN Lan-Dong-
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摘要

通过WRF V2.1.2模式数值模拟试验并结合长期观测数据， 研究了中国西北半干旱区长期存在和维持的森林山区（兴隆山区， 103.84°E、 35.86°N）的降水特征及其与周边地区的降水差异， 并探讨了造成这种差异的主要原因。结果表明， 兴隆山区与周边地区的降水差异主要表现在夏、 秋季。在夏、 秋季兴隆山区受东南湿润气流的影响， 获得较多的水汽输入和较稳定的水汽来源， 而山地地形则有利于截留东南气流携带的水汽并形成降水； 兴隆山区及其周边地区局地的蒸散差异对二者之间降水差异的贡献不大。另外， 兴隆山区土壤堆积覆盖的石质山构造和森林下垫面也有利于降水的截留和贮存以及植被的生长。因此， 有利于水汽输入的大尺度环流形势、 地形对空中水汽的截留以及特殊的地质因素是兴隆山山区孤立森林岛在半干旱区长期存在和维持的原因。

Abstract

Using a numerical model and the long term observation data, the precipitation differences between an isolated mountain forest (Xinglong, 103.84°E， 35.86°N) and its surrounding area over the arid/semi-arid region of Northwest China is studied in order to understand the mechanisms for the persistence of the isolated forest. The results indicate that the precipitation differences between Xinglong Mountain and its surrounding area are the largest in summer and autumn. The Xinglong Mountain area is dominated by the southeastern wet flow in summer and autumn and consequently a stable water vapor source. In addition, the meso-scale high mountainous terrain blocks the water vapor from the southeastern flow and enhances precipitation. The contribution of local evapotranspiration to the precipitation is less than that of advection effects of water vapor. On the other hand, the rock tectonics of Xinglong Mountain covered by soil and forest also help to hold and store water for the growth of plants. Therefore, the persistence of the forest island   of Xinglong Mountain in semi-arid regions is the consequence of the large-scale circulation, which transports more water vapor, the orography and the special geology which tend to help and store more water vapor for this area.

关键词

地形降水 / 局地蒸散 / 环流输送 / 数值模拟

Key words

Orographic precipita / Local evapotranspira / Circulation transpor / Numerical simulation

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陈磊;田文寿;黄倩;黄建平;王婵;孙兰东. 西北中部半干旱区兴隆山森林岛降水机理的数值模拟. 高原气象. 2012, 31(4): 885-899
陈磊;田文寿;黄倩;黄建平;王婵;孙兰东. Numerical Simulation of Precipitation Mechanisms for an Isolated Forest Mountain Area in Semi-Arid Region of Middle of Northwest China. Plateau Meteorology. 2012, 31(4): 885-899

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