长江流域资源与环境 >> 2012, Vol. 21 >> Issue (06): 739-.

• 生态环境 • 上一篇    下一篇

基于WRF三峡地区不同区域降水中下垫面效应数值试验研究

李强, 刘德, 陈贵川, 李永华, 王中   

  1. (1.重庆市气象台|重庆 401147|2.重庆市气候中心|重庆 401147|3.重庆市人工影响天气办公室|重庆 401147)
  • 出版日期:2012-06-20

NUMERICAL EXPERIMENTATION STUDY OF THE LOCAL UNDERLYING SURFACE EFFECT ON DIFFERENT REGIONAL PRECIPITATION IN THE THREE GORGES AREA BASED ON WRF MODEL

LI Qiang1, LIU De1, CHEN Guichuan1, LI Yonghua2, WANG Zhong3   

  1. (1.Chongqing Meteorological Office,Chongqing 401147,China|2.Chongqing Climate Center,Chongqing 401147,China|3.Chongqing Weather Modification Office,Chongqing 401147,China
  • Online:2012-06-20

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2 m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2 m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 circulation 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 affected 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 regional 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

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