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首页> 外文期刊>Acta Meteorologica Sinica >NUMERICAL SIMULATION OF THE INFLUENCE OF VEGETATION COVER FACTOR ON BOUNDARY LAYER CLIMATE IN SEMI- ARID REGION
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NUMERICAL SIMULATION OF THE INFLUENCE OF VEGETATION COVER FACTOR ON BOUNDARY LAYER CLIMATE IN SEMI- ARID REGION

机译：半干旱地区植被覆盖因子对边界层气候影响的数值模拟。

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摘要

A numerical model has been developed for simulating land-surface processes and atmospheric boundary layer climate of vegetation and desert in semi-arid region. Dynamically, thermal and hydrological processes take place in the atmospheric boundary layer. Vegetation and surface layer of soil are included in the soil-vegetation-atmosphere coupled system, in which, vegetation is considered as a horizontally uniform layer, soil is divided into 13 layers and the horizontal differences of variables in the system are neglected. The influence of local boundary layer climate by vegetation cover factor is simulated with the coupled model in the semi-arid region of Northwest China (around 38°N, 105°E). Results indicate that due to significant differences of water and energy budgets in vegetation and desert region, the air is colder and wetter over the vegetation and correspondingly an obvious local circulation in the lower atmosphere is formed. Simulating results also show that maximum updraft and downdraft occur around the vegetation-desert marginal area, where the dynamical and thermodynamical properties of PBL (Planetary Boundary Layer) are uncontinuous. It is stronger at daytime, weaker and reverse at nighttime. In the simulation, the moisture inversion phenomena are analyzed. Finally, the influences of vegetation cover factor exchange on local boundary layer climate are simulated. The simulating results bring to light that water may be conserved and improved by developing tree planting and afforestation, and improving cover factor of vegetation in local ecoenvironment. and this is an important way of transforming local climate in arid and semi-arid area. Results indicate that the coupled model can be used to study the soil-vegetation-atmosphere interaction and local boundary layer climate.
机译：建立了一个模拟半干旱地区植被和沙漠地表过程和大气边界层气候的数值模型。动态地，热和水文过程发生在大气边界层。土壤-植被-大气耦合系统包括土壤的植被和表层，其中植被被视为水平均匀的层，将土壤分为13层，忽略了系统变量的水平差异。利用耦合模型模拟了西北半干旱地区（约38°N，105°E）的局部边界层气候对植被覆盖因子的影响。结果表明，由于植被和荒漠地区水能和能量收支的显着差异，植被上的空气更冷，更湿，因此在低层大气中形成了明显的局部环流。模拟结果还表明，最大的上升和下降气流发生在植被荒漠边缘区域，那里的PBL（行星边界层）的动力学和热力学性质是不连续的。它在白天更强，而在夜晚更弱并且反向。在模拟中，分析了水分反转现象。最后，模拟了植被覆盖因子交换对局部边界层气候的影响。模拟结果表明，通过发展植树造林和改善当地生态环境中植被的覆盖率，可以节约用水并改善水质。这是改变干旱和半干旱地区局部气候的重要途径。结果表明，该耦合模型可用于研究土壤－植被－大气相互作用和局部边界层气候。

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