| 稀疏植被地表反照率及土壤热传导率特征研究 |
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| 引用本文： | 王胜,张强,张鸿.稀疏植被地表反照率及土壤热传导率特征研究[J].中国沙漠,2008,28(1):119-124. |
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| 作者姓名： | 王胜 张强 张鸿 |
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| 作者单位： | 1.中国气象局兰州干旱气象研究所/甘肃省(中国气象局)干旱气候变化与减灾重点(开放)实验, 甘肃 兰州 730020; 2.甘肃省人工影响天气办公室, 甘肃 兰州 730020 |
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| 基金项目： | 国家自然科学基金项目（40575006）;兰州干旱所干旱基金;国家重点基础研究发展规划（G1998040900）共同资助 |
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| 摘 要： | 利用“敦煌试验”稀疏植被站2002年典型晴天的资料,分析了与地表能量平衡最密切的两个参数：地表反照率和土壤热传导率的特征。分析发现稀疏植被下垫面的地表反照率日变化具有明显的不对称特征,这与以往在戈壁或沙漠上的地表反照率的研究明显不同,这可能是由于早晨的露水造成的。另外分别用定义法和加权平均法分别计算得到典型晴天敦煌稀疏植被的平均地表反照率基本为0.25,两种方法计算得到的地表反照率非常接近,得到的地表反照率的值与敦煌戈壁的值较接近,但比“黑河试验”的结果大。这也从一个侧面反映出稀疏植被区是一个气候敏感区。得到的稀疏植被下垫面的地表反照率应该可以作为遥感反演和陆面过程模式的一个参考值。另外还得到了敦煌稀疏植被干燥土壤的热传导率的平均值为0.20 W\5m-1\5K-1,在晴天,干燥土壤的执传导率基本分布在0.164~0.24 W\5m-1\5K-1范围内,平均值与敦煌戈壁2.5 cm处的土壤执传导率接近,但稍大一些;比“黑河试验”在戈壁观测的值小近一倍,而比权威的文献给出的干燥沙漠的值要小一些。
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| 关 键 词： | 稀疏植被 反照率 土壤热传导率 西北干旱区 |
| 文章编号： | 1000-694X（2008）01-0119-06 |
| 收稿时间： | 2007-05-18 |
| 修稿时间： | 2007-07-10 |
Characteristics of Surface Albedo and Soil Heat Conductivity in Sparse Vegetation Site |
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| WANG Sheng,ZHANG Qiang,ZHANG Hong.Characteristics of Surface Albedo and Soil Heat Conductivity in Sparse Vegetation Site[J].Journal of Desert Research,2008,28(1):119-124. |
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| Authors: | WANG Sheng ZHANG Qiang ZHANG Hong |
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| Institution: | 1.Lanzhou Arid Meteorology Institute of China Meteorological Administration; Key(Open) Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province(China Meteorological Administration), Lanzhou 730020, China; 2.Gansu Provingce Weather Modification office, Lanzhou 730020, China |
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| Abstract: | In this paper, the two parameters that are close related to surface energy balance: surface albedo and soil heat conductivity are analyzed based on the data observed on clear day of year 2002 at the station in sparse vegetation site in Dunhuang. Being different from the former research results in gobi or desert regions the diurnal variation of surface albedo in sparse vegetation site shows remarkable asymmetry; calculated by two different methods the mean albedo on typical clear day is about 0.25. The value is close to that on gobi in Dunhuang but larger than that in \!HEIFE\" experiment, which in some respects reflects that the sparse region is a sensitive climate region. The soil heat conductivity of dry soil on clear day is 0.164~0.24 W\5m-1\5K-1 and the mean is 0.20 W\5m-1\5K-1, which is close to the value in gobi of Dunhuang, but only about an half of the value in ‘HEIFE’ and smaller than that in dry desert from some authoritative references. |
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| Keywords: | sparse vegetation albedo soil heat conductivity arid region in northwest China |
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