| 地表蒸散遥感反演双层模型的研究方法综述 |
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| 引用本文： | 刘雅妮,武建军,夏虹,范锦龙.地表蒸散遥感反演双层模型的研究方法综述[J].干旱区地理,2005,28(1):65-71. |
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| 作者姓名： | 刘雅妮 武建军 夏虹 范锦龙 |
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| 作者单位： | 北京师范大学资源学院,环境演变与自然灾害教育部重点实验室,北京,100875;中国气象局国家卫星气象中心,北京100081 |
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| 基金项目： | 国家863计划数字农业重大专项(2003AA209040)资助 |
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| 摘 要： | 通过遥感方法反演表面温度来计算地表蒸散量是定量遥感的一个很有潜力的应用领域。这种方法已成功地应用于植被完全覆盖的地表蒸散的监测，然而对于植被稀疏的地区，利用该方法模拟通量和观测通量之间存在很人的差异。产生这种差异的原因是假设辐射表面温度可以用来代替空气动力学温度。在这种假设条件下，植被完全覆盖的地表的通量计算能够得到较为满意的结果，但对于稀疏植被地表却是不成立的。对此，国内外许多学者提出了将土壤和植被分开计算的双层模型以求得到更加准确的通量结果。介绍了当前国内外几种常用的地表蒸散遥感估算双层模型，讨论了这些模型的物理基础和假设并讨论了目前双层模型在计算通量时存在的一些问题和难点，并对今后的工作重点和研究方向提出了建议。
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| 关 键 词： | 遥感反演 双层模型 地表蒸散(ET) 植被覆盖 |
| 文章编号： | 1000-6060(2005)01-0065-07 |
| 修稿时间： | 2004年9月12日 |
Summary of Two-layer Models on Estimating Evapotranspiration Using Quantitative Parameters Derived from Remote Sensing |
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| LIU Ya-ni,WU Jian-jun,XIA Hong,FAN Jin-long.Summary of Two-layer Models on Estimating Evapotranspiration Using Quantitative Parameters Derived from Remote Sensing[J].Arid Land Geography,2005,28(1):65-71. |
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| Authors: | LIU Ya-ni WU Jian-jun XIA Hong FAN Jin-long |
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| Institution: | LIU Ya-ni1,WU Jian-jun1,XIA Hong1,FAN Jin-long2 |
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| Abstract: | The approach of surface temperature to estimate the spatial distribution of evapotranspiration by usingremote sensing is very attractive. This approach has been applied successfully over the surface almost fullycovered with vegetation. However, there are high discrepancies between the measured and simulated surfacefluxes over the surface with sparse vegetation. These discrepancies are caused by that it is assumed that theradiative surface temperature can be regarded as the aerodynamic temperature; in fact, it is not suitable forsparsely vegetated surfaces. In an attempt to improve the estimates of the sensible heat flux and compute moreaccurate values of the latent heat flux over partial canopy cover, two-layer resistance models are developed. In thispaper, these different two-layer models are briefly reviewed, and the main physical bases and assumptions of thesemodels are also discussed. Finally, some present potentialities and limits or difficulties in calculating the surfacefluxes with the two-layer models are also discussed, and some suggestions are put forward for the studies in thefuture. |
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| Keywords: | surface energy balance remote sensing two-layer model evapotranspiration |
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