| 利用MERIS和AATSR资料估算黄土高原塬区蒸散发量研究 |
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| 引用本文： | 刘蓉,文军,张堂堂,刘远永,李振朝.利用MERIS和AATSR资料估算黄土高原塬区蒸散发量研究[J].高原气象,2008,27(5). |
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| 作者姓名： | 刘蓉 文军 张堂堂 刘远永 李振朝 |
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| 作者单位： | 中国科学院,寒区旱区环境与工程研究所西部气候环境与灾害实验室,甘肃,兰州730000 |
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| 基金项目： | 中国科学院知识创新项目，公益性行业(气象)科研专项，中国科学院野外台站研究基金项目共同资助 |
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| 摘 要： | 基于陆面能量平衡原理,通过对搭载在欧洲空间局环境卫星(Environmental Satellite,ENVI-SAT)上中分辨率影像光谱仪(Medium Resolution Imaging Spectrometer,MERIS)2005年6月7,11和27日的遥感观测资料进行大气纠正等预处理后,得到估算瞬时蒸散发量所需要的地表反照率和植被覆盖度等值,并利用分裂窗法和ENVISAT上搭载的先进的沿轨迹扫描辐射计(Advanced Along-TrackScanning Radiometer,AATSR)的观测资料进行了地表温度的反演,进一步估算出黄土高原塬区午间瞬时净辐射、感热通量和土壤热通量。结合与卫星遥感观测资料同期研究区域气象站的太阳辐射、气温、日照时数和风速等气象要素资料,充分考虑到植被冠层和陆地表面对蒸散发量的不同影响,发展了一个可以估算陆面潜热的简化模型,并将瞬时蒸散发量转化为日蒸散发量。对卫星遥感估算的潜热通量,利用黄土高原塬区陆面过程野外观测试验(Loess Plateau land surface process field Experiments,LOPEXs)的地面通量观测资料进行验证,结果表明:二者最大相对差异为10.9%,最小相对差异为4.8%,并对差异误差产生的原因进行了分析和探讨。
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| 关 键 词： | 黄土高原塬区 能量平衡 日蒸散发量 卫星遥感 MERIS AATSR |
Study on Evapotranspiration Retrieval Using MERIS and AATSR Data over the Loess Plateau Mesa Region |
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| LIU RONG,WEN Jun,ZHANG Tang-tang,LIU Yuan-yong,LI Zheng-chao.Study on Evapotranspiration Retrieval Using MERIS and AATSR Data over the Loess Plateau Mesa Region[J].Plateau Meteorology,2008,27(5). |
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| Authors: | LIU RONG WEN Jun ZHANG Tang-tang LIU Yuan-yong LI Zheng-chao |
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| Abstract: | The evapotranspiration over the Loess Plateau mesa region where is heterogeneous landscape are critical and complicated,but the utilization of satellite remote sensing has unique advantage in wide observation and high temporal resolution over heterogeneous landscape.In this paper,the potential using the remote sensing data from Medium Resolution Imaging Spectrometer,one of the onboard sensor of the Environmental Satellite,was established to explore estimates of the land surface albedo,plant coverage used in evapotranspiration estimate based on the Land Surface Energy Balance Theory on June 7,11 and 27,2005.The 'Splits Window' algorithm was used to retrieve the surface temperature from Advanced the Along-Track Scanning Radiometer,another onboard senor of the Environmental Satellite.Then the net radiation,sensible heat flux and soil heat flux were worked out over the Loess Plateau mesa in China.Considering of the vegetation canopy and land surface characteristics,daily evapotranspiration model was deriveded by combining the data of solar radiation,air temperature,sunshine integrator and wind speed from the weather station.The daily evapotranspiration model can also transform instantaneous evapotranspiration to daily value.Comparing with latent heates flux retrieved by remote sensing data and ground observation during Loess Plateau land surface process field experiment,the maximum and minimum errors of this approach is 10.96% and 4.80%,respectively.The case of the bias was also explored and discussed. |
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| Keywords: | Loess Plateau mesa region Energy balance Daily Evapotranspiration Satellite remote sensing MERIS AATSR |
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