J4 ›› 2008, Vol. 25 ›› Issue (1): 1-6.

• 论文 •    下一篇

甘肃马衔山区陆面过程与降水的研究

陈乾1毛玉琴2李宝梓1   

  1. 1.甘肃省人工影响天气办公室,甘肃兰州730020;2.甘肃省山丹县气象局,甘肃山丹734100
  • 收稿日期:2006-11-06 修回日期:2007-02-06 出版日期:2007-03-31 发布日期:2007-03-31
  • 作者简介:陈乾(1934一),男,上海市人,研究员,从事卫星遥感应用研究.E-mail:qianchen_2006@yahoo.com.cn
  • 基金资助:

    国家自然基金重点项目“西t地形云结构及降水机理研究(40533015)”资助

Research of Land Surface Process and Pr ecipitation over the M axian Mountain RegiOn of Gansu

CHEN Qian1 ,MAO Yuqin2 ,LI Baozi1   

  1. 1.Gansu Weather Modification Of,ce,Lanzhou 730020,China;2.Shandan Meteorological
    Station ofGansu Province,Shandan 734100,China
  • Received:2006-11-06 Revised:2007-02-06 Online:2007-03-31 Published:2007-03-31

摘要:

采用定西的麦田微气象观测,定西、兰州的辐射观测和马衔山区34个气象、水文和雨量站的气候资料,结合NOAA一16卫星的AVHRR资料以及反演的地表植被盖度和反射率,并用SEBAL算法推导出夏季地表净辐射、感热、潜热、土壤热通量密度的区域分布特征,并分析陆面过程对降水的影响。结果表明:本区降水的空间分布与夏季植被盖度对应最好,相关系数高达0.722,其次是土壤热通量和潜热通量,相关系数分别为一0.65和0.615。这表明森林通过降低地表反射率和表面温度,不仅增加地表净辐射,而且减少其用于感热和土壤热通量的消耗。由于林区地表水分多,从而将接收较多的太阳辐射能主要用于蒸散,增加边界层中的水汽。故林区降水远大于植被稀疏的半干旱黄土梁

关键词: 甘肃马衔山区, 陆面过程, 降水

Abstract:

The regional distribution features of daily mean net radiation,sensible heat flux,latent heat flux and soil heat flux density in summer over central Gansu were derived from the Surface Energy Balance A1gorithm for Land(SEBAL)using micrometeorological ob.servations over a wheat field at Dingxi station,solar radiation observations at Dingxi and Lanzhou stations.observations of 34 meteoro-logical。hydrological and rainfall stations over the Maxian Mountain region,combining with NOAA一16 AVHRR data,as well as the land surface reflectance an d vegetation coverage retrieyed from NOAA一16 AVHRR data.the efects of land surface process on precipi.tation were also analyzed in this paper.Th e results show that the regional distribution of annual mean precipitation corresponds well to vegetation coverage in summer。the correlation coeficient is 0.722.and the correlation coeficients of annual mean precipitation and soil heat flux .1atent heat flux density are 一0.65 and 0.615.respectively.It is showed that the forest can not only increase net radia-tion but also decrease sensible and soil heat fluxes by decreasing surface reflectance and temperature.More solar energy can bere·ceived and mostly used for evapotranspiration over forest regions.which makes vapor content increased there.For this reason precipita—tion over forest regions is much more than that of semi—arid regions with sparse vegetation

Key words: the Maxian mountain region, land surface process, precipitation

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