摘要
在法国陆面过程模式的基础上 ,为了表示冠层叶片遮挡对水分蒸发阻抗的影响 ,在植被覆盖部分引入了遮盖因子 ,然后将这个修正的陆面过程参数化模式耦合到MM 5模式中。耦合后的模式模拟出了因为降水造成土壤湿度变化和植被覆盖动态作用对地面通量的影响 ,而原MM 5模式模拟结果则没有反映上述动态变化对地面通量的作用。原MM 5模式和耦合模式模拟了 1993年 8月 17日到 2 0日以内蒙古半干旱草原为中心的中尺度区域的气象场 ,模拟结果和IM GRASS预观测资料进行了对比 ,对比说明新的陆面过程模式提高了MM 5模式对地面通量和边界层各物理量 (风、温、湿 )的模拟精度。
The French land surface parameterization model for land-surface processes is modified first by using a cover factor to take account of the shelter effect of the vegetation canopy on the canopy resistance, and then, the simple land surface parameterization of MM5 model is replaced by this developed scheme The results of the coupled MM5 and NP89 and the old version of MM5 modeling experiment are compared with the testing field data of IMGRASS in August 1993 The coupled MM5 well simulated the surface energy flux change due to the alteration of soil moisture status caused by the precipitation and the vegetation effect Simulated planetary boundary layer humidity profile, temperature profile and wind profile also are better agreement with the measurements than the results of old version of MM5
出处
《大气科学》
CSCD
北大核心
2000年第2期177-186,共10页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目!4 9790 0 2 0
关键词
MM5模拟系统
陆面过程
参数化模式
地面能量通量
MM5 modeling system
land surface parameterization model
surface energy flux
planetary boundary layer profile
