The Surface Energy Balance System (SEBS) for estimation of turbulent heat fluxes
The Surface Energy Balance System (SEBS) for estimation of turbulent heat fluxes
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DOI：
10.5194/hess-6-85-2002
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发表时间：
2002-02-01
影响因子：
6.3
通讯作者：
Su, Z
中科院分区：
文献类型：
--
作者：
Su, Z
本文提出了一个利用卫星对地观测资料，结合适当尺度的气象资料，估算大气湍流通量和蒸发份额的地面能量平衡系统（SEBS）。SEBS包括：一套用于确定陆地表面物理参数的工具，如辐射率、发射率、温度、植被覆盖率等，从光谱反射率和辐射测量，模型的粗糙度长度的热传递和新的配方，用于确定的基础上，在极限情况下的能量平衡的蒸发分数的测定。四个实验数据集被用来评估SEBS的可靠性。基于这些案例研究，SEBS已被证明能够以可接受的准确度估计各种尺度的湍流热通量和蒸发份额。估计的热通量的不确定性与现场测量的不确定性相当。
A Surface Energy Balance System (SEBS) is proposed for the estimation of atmospheric turbulent fluxes and evaporative fraction using satellite earth observation data, in combination with meteorological information at proper scales. SEBS consists of: a set of tools for the determination of the land surface physical parameters, such as albedo, emissivity, temperature, vegetation coverage etc., from spectral reflectance and radiance measurements, a model for the determination of the roughness length for heat transfer and anew formulation, for the determination of the evaporative fraction on the basis of energy balance at limiting cases. Four experimental data sets are used to assess the reliabilities of SEBS. Based on these case studies, SEBS has proven to be capable to estimate turbulent heat fluxes and evaporative fraction at various scales with acceptable accuracy. The uncertainties in the estimated heat fluxes are comparable to in-situ measurement uncertainties.