陆面上总体输送系数的特征
CHARACTERISTICS OF BULK DRAGE COEFFICIENT AND TRANSPORT COEFFICIENT OVER THE LAND
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摘要: 利用气象铁塔的风、温梯度资料,对陆面上近地层湍流拖曳系数CD和总体输送系数CH(或CE)的大小和日变化规律进行研究。发现陆面上较粗糙的地表,CD和CH可以比海面上大一个量级左右。而且存在着明显的日变化。它们对地表面动力粗糙度变化的反应较敏感。本工作为气候及大气环流模式研究中陆面参数化过程提供了重要依据。Abstract: The magnitude and diurnal variation of the turbulent drag coefficient CD and bulk transport coefficient of heat (or moisture) flux. CH (or CE),have been studied by using the wind speed and temperature gradient data of meteorological towers. It' s shown that the CD, CH (or CE) can be about one order in greater over rough land surface than over sea surface. There are obvious diurnal changes of these coefficients. Their responses to the changes of dynamic roughness are sensitive.
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