| 半干旱区不同下垫面近地层湍流通量特征分析 |
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| 引用本文： | 涂钢,刘辉志,董文杰.半干旱区不同下垫面近地层湍流通量特征分析[J].大气科学,2009,33(4):719-725. |
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| 作者姓名： | 涂钢 刘辉志 董文杰 |
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| 作者单位： | 1.吉林省气象科学研究所中高纬度环流系统与东亚季风研究实验室, 长春,130062 |
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| 基金项目： | 国家重点基础研究发展规划项目2006CB400501，国家自然科学基金资助项目40775050 |
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| 摘 要： | 本文分析了2003～2005年半干旱区退化草地和农田下垫面近地层湍流通量日、季、年的变化特征, 探讨了不同年份的气候背景和下垫面土地覆被对地气交换过程的影响。结果表明: 半干旱区退化草地和农田近地层湍流通量具有明显的日变化、季变化周期; 地气间通量交换年际间的差异主要受当年的气候背景影响, 尤其是降水的影响; 同时还受到下垫面覆被的影响。潜热通量和感热通量的能量分配比率呈反位相变化, 且农田和退化草地的变化趋势相似, 在夏季潜热通量所占比例均超过感热通量; 两种下垫面的波恩比月均值变化趋势十分相似, 量级接近, 夏季低, 春、秋季高; 夏季退化草地和农田下垫面波恩比均小于或等于1。
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| 关 键 词： | 近地层湍流通量交换 下垫面 半干旱区 |
Characteristics of the Surface Turbulent Fluxes over Degraded Grassland and Cropland in the Semi-Arid Area |
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| TU Gang,LIU Huizhi and DONG Wenjie.Characteristics of the Surface Turbulent Fluxes over Degraded Grassland and Cropland in the Semi-Arid Area[J].Chinese Journal of Atmospheric Sciences,2009,33(4):719-725. |
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| Authors: | TU Gang LIU Huizhi and DONG Wenjie |
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| Institution: | 1.Laboratory of Research for Middle-High Latitude Circulation System and East Asia Monsoon, Institute of Meteorological Science of Jilin Province, Changchun, 1300622.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 1000293.State Key Laboratory of Earth Surface Processes and Ecology Resource, Beijing Normal University, Beijing, 100875 |
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| Abstract: | The seasonal and diurnal variations of the surface turbulent fluxes over the degraded grassland and the cropland are investigated, based on the turbulent flux data measured with Eddy Covariance (EC) method and radiation and meteorological data collected from 2003 to 2005 in the semi-arid area. The influence of different meteorological backgrounds on the turbulent fluxes between land and atmosphere over different land surfaces is also discussed. It is shown that there are clear seasonal and diurnal variations for the components of surface energy balance over the degraded grassland and the cropland in the semi-arid area. The interannual variability of the components of surface energy balance is mainly influenced by meteorological backgrounds in the same year, especially by precipitation. The ratios of net radiation to latent heat flux and to sensible heat flux show an opposite phase change over both degraded grassland and cropland, and the ratio for the latent heat flux is higher than that for the sensible heat flux in summer. The trends of mean monthly Bowen ratios over two types of underlying surfaces are almost the same, and the magnitudes of the Bowen ratios are near. The Bowen ratio in summer is not larger than 1.0 over both degraded grassland and cropland. |
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| Keywords: | surface turbulent flux sensible heat flux semi-arid area |
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