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城市地表潜热通量数值模拟方法研究

, PP. 1017-1025

Keywords: 城市,地表能量平衡,潜热通量,数值模拟,陆面模式,城市冠层模式

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Abstract:

?近年来,中尺度气象模式中城市建筑物影响的数值模拟方法日趋完善,城市地表潜热通量数值模拟方法是目前城市地气耦合研究面临的瓶颈问题之一.采用北京325m气象塔140m高度处的能量平衡观测资料,用陆面-单层城市冠层耦合模式进行了一年连续的离线模拟.根据模式对城市下垫面潜热通量模拟的系统性误差较大的特点,基于观测资料研究了城市下垫面潜热通量的数值模拟方法.采用观测分析与城市陆面模式相结合的方法,求出了城市中绿地的绿洲效应系数、城市不透水下垫面水份有效率的时间变化公式以及人为潜热排放的日变化曲线和四季最大值,可直接应用于城市陆面模式,有效提高了模式的整体模拟性能.该方法对其他城市地区有一定的参考意义.

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