• 关键词：热岛  环流  坡风

• 基金项目：

• 杨礼荣
• 中国环境科学研究院大气所,北京

• 任阵海
• 中国环境科学研究院大气所,北京

• 彭贤安
• 中国环境科学研究院大气所,北京

• 摘要：利用数值积分方法求解二维盆地地形大气热力-动力学方程组及扩散方程,模拟了在盛行风和静风时,盆地内有无热岛条件下整个区域的流场及其盆地内存在面源时的浓度分布。结果表明,白天山脉作为热源,而晚间成为冷源;存在明显的山坡风环流,但盆地内环流要比盆地外弱;静风、有热岛时,盆地内污染物浓度大于没有热岛时;有盛行风时,盆地内污染物会被带至盆地外的平原地带,迎风坡是受污染最严重的地带。

• Abstract：The two-dimensional atmospheric thermodynamics-dynamics equations and diffusion equations were solved by the numerical integration method in a basin terrain. The flow field and the concentration distribution were modeled with area source and heat island in the initial condition of calm wind(case I)or prevailing wind(case Ⅱ) .The results showed that the moun-tains can be considered as thermal sources during the day and as cold sources at night. In the case I, circulation occurs between mountain slop and flatf terrain which is stronger out of basin than within the basin, In the case Ⅱ,the pollutants within the basin are brought out of it. The effects of heat island and the downslope wind on the windward side are not obvious when there is prevailing wind, but the upslope wind on the lee side is obvious. The windward side is a region polluted seriously where pollutants could drop to the downstream villages. It is especially clear that the existence of heat island within basin region can accelerate the downslope wind at night and decrease the upslope wind during the day.

• Key words：heat island  circulation  slope wind

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