| 甘肃马衔山区陆面过程与降水的研究 |
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| 引用本文： | 陈乾,毛玉琴,李宝梓.甘肃马衔山区陆面过程与降水的研究[J].甘肃气象,2007,25(1):1-6. |
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| 作者姓名： | 陈乾 毛玉琴 李宝梓 |
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| 作者单位： | 甘肃省人工影响天气办公室 甘肃兰州730020(陈乾，李宝梓)，甘肃省山丹县气象局 甘肃山丹734100(毛玉琴) |
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| 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-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-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。
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| 关 键 词： | 甘肃马衔山区 陆面过程 降水 |
| 文章编号： | 1006-7639（2007）-01-0001-06 |
| 修稿时间： | 2006-11-06 |
Research of Land Surface Process and Precipitation over the Maxian Mountain Region of Gansu |
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| CHEN Qian,MAO Yuqin,LI Baozi.Research of Land Surface Process and Precipitation over the Maxian Mountain Region of Gansu[J].Gansu Meteorology,2007,25(1):1-6. |
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| Authors: | CHEN Qian MAO Yuqin LI Baozi |
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| Institution: | 1. Gansu Weather Modification Office, Lanzhou 730020, China;2. Shandan Meteorological Station of Gansu Province, Shandan 734100, China |
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| 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 Algorithm for Land(SEBAL) using micrometeorological observations over a wheat field at Dingxi station,solar radiation observations at Dingxi and Lanzhou stations,observations of 34 meteorological,hydrological and rainfall stations over the Maxian Mountain region,combining with NOAA-16 AVHRR data,as well as the land surface reflectance and vegetation coverage retrieved from NOAA-16 AVHRR data,the effects of land surface process on precipitation were also analyzed in this paper.The results show that the regional distribution of annual mean precipitation corresponds well to vegetation coverage in summer,the correlation coefficient is 0.722,and the correlation coefficients of annual mean precipitation and soil heat flux,latent heat flux density are-0.65 and 0.615,respectively.It is showed that the forest can not only increase net radiation but also decrease sensible and soil heat fluxes by decreasing surface reflectance and temperature.More solar energy can be received and mostly used for evapotranspiration over forest regions,which makes vapor content increased there.For this reason precipitation over forest regions is much more than that of semi-arid regions with sparse vegetation. |
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| Keywords: | the Maxian mountain region land surface process precipitation |
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