摘要
利用具有代表性的三峡地区区域性降水个例,基于WRF模式,在模式下垫面中加入长江水体以及修改局地地形,研究局地环流和气象要素对局地下垫面变化的响应。结果表明:加入长江水体后,不同区域性降水个例空间降水变化上,没有出现明显的降水变化区,表明长江水体对区域局地性降水影响较小;同时加入长江水体和修改地形高度后,空间上降水具有明显的变化,且与修改地形后的降水空间变化较一致,表明局地地形对区域降水空间变化具有重要影响;加入长江水体后,近地面2m高度相对湿度变化上,不同区域性降水个例表现不一,总体上对局地相对湿度影响较小;近地面2m温度、地表向上的水汽通量和地表向上的潜热通量均为增加,在局地地形的"喇叭口"效应作用下,长江水体拐弯处增加效应明显。
Abstract. Based on WRF model, using representative precipitation cases in different region with the Yangtze River water bodies added and the local terrain modified in the inherent underlying surface, the local circula- tion features and different meteorological elements of the response for local surface changes were studied. The results showed that changed precipitation zone was not obvious with the Yangtze River Water bodies imbedding in the different regional rainfall cases, which indicated that the Yangtze River water bodies af- fected local precipitation weakly. The Yangtze River underlying surface imbedded and the terrain height modified simultaneously had great influence on the spatial rainfall variation, and the situation was the same as modified terrain height independently. It suggested that local topography was important to the spatial rainfall. The variation of relative humidity distant from ground at 2 meters were different in different re- gional rainfall cases with changed underlying surface water bodies,and the impact on local relative humidity was inconspicuous overall. The temperature at 2 m away from ground, surface upward moisture flux and surface upward heat flux increased mostly, which were more obvious in the Yangtze River turning under the role of local terrain ＂bell＂.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2012年第6期739-748,共10页
Resources and Environment in the Yangtze Basin
基金
重庆市自然科学基金计划重点项目(CSTC
2008BA0022)
重庆市气象局2012年业务技术攻关项目(ywgg-201201
ywgg-201205)
关键词
WRF模式
下垫面
三峡地区
数值模拟
WRF model
the underlying surface
the Three Gorges area
the numerical experimentation
