| 中国西北三类典型裸土下垫面地表宽波段发射率变化特征研究 |
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| 引用本文： | 郑志远,韦志刚,李振朝,文小航,陈辰.中国西北三类典型裸土下垫面地表宽波段发射率变化特征研究[J].大气科学,2016,40(6):1227-1241. |
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| 作者姓名： | 郑志远 韦志刚 李振朝 文小航 陈辰 |
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| 作者单位： | 1.北京师范大学地表过程与资源生态国家重点实验室, 北京 100875;北京师范大学珠海分校未来地球研究院, 珠海 519087 |
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| 基金项目： | 国家自然科学基金项目41275011、41375001、41405063 |
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| 摘 要： | 利用2013年我国西北戈壁、沙漠和黄土塬区三类典型裸土下垫面野外观测试验资料，探究了上述地区地表向下、向上长波辐射（DLR&ULR）、地表温度（LST）和地表宽波段发射率（LSBE）的变化特征，结果表明:黄土站地表ULR和LST明显比戈壁和沙漠站偏低；戈壁宽波段发射率（GbBE）、沙漠宽波段发射率（DeBE）和黄土宽波段发射率（LoBE）具有明显的变化特征，尤其是日变化特征；观测期内GbBE、DeBE和LoBE平均值分别约为0.926±0.0452、0.916±0.0419和0.881±0.049。三站点地表宽波段发射率的数值大小和变化特征与陆面模式中所指定的参数化情况不符。地表发射率会受站点周围环境和当时气象条件等因素的影响，表层土壤湿度被认为是一个非常重要的影响因子，将来的野外观测试验中需加强相关影响要素的观测与分析。
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| 关 键 词： | 干旱半干旱区 野外观测试验 地表宽波段发射率 典型下垫面 |
| 收稿时间： | 2015/9/22 0:00:00 |
A Study of Variation Characteristics of Surface Broadband Emissivity over Three Typical Bare Soil Underlying Surfaces in Northwestern China |
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| ZHENG Zhiyuan,WEI Zhigang,LI Zhenchao,WEN Xiaohang and CHEN Chen.A Study of Variation Characteristics of Surface Broadband Emissivity over Three Typical Bare Soil Underlying Surfaces in Northwestern China[J].Chinese Journal of Atmospheric Sciences,2016,40(6):1227-1241. |
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| Authors: | ZHENG Zhiyuan WEI Zhigang LI Zhenchao WEN Xiaohang and CHEN Chen |
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| Institution: | State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875;Future Earth Research Institute, Beijing Normal University Zhuhai Campus, Zhuhai 519087,State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875;Future Earth Research Institute, Beijing Normal University Zhuhai Campus, Zhuhai 519087,Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000,Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225Future Earth Research Institute, Beijing Normal University Zhuhai Campus, Zhuhai 519087 and State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875;Future Earth Research Institute, Beijing Normal University Zhuhai Campus, Zhuhai 519087 |
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| Abstract: | A field observational experiment on ground surface downward longwave radiation (DLR),upward longwave radiation (ULR),and land surface temperature (LST) was conducted at three man-made sites at Gobi,desert,and bare loess zones in 2013 in Gansu Province.In the present study,variation characteristics of surface longwave radiation (LR),LST and surface broadband emissivity over Gobi (GbBE),desert (DeBE),and loess (LoBE) underlying surfaces are analyzed based on the observations collected in the experiment.Results show that the ULR and LST at the Loess site are lower than that at Gobi and desert sites.Surface broadband emissivity at each site has obvious variation characteristics,especially the diurnal cycle feature.Daily averages of surface broadband emissivity at GbBE,DeBE,and LoBE are approximately 0.926±0.0452,0.916±0.0419,and 0.881±0.049,respectively.The values and variation characteristics of observed land surface emissivity are not consistent with that in land surface models.Land surface emissivity can be affected by environmental factors and weather condition.Land surface soil moisture is a significant factor influencing surface emissivity in arid and semi-arid region.More relatively influential factors should be measured and analyzed in the future in field observational experiments. |
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| Keywords: | Arid and semi-arid area Field observational experiment Land surface broadband emissivity Typical underlying surface |
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