Determination of land surface heat fluxes over heterogeneous landscape of the Tibetan Plateau by using the MODIS and in situ data
Determination of land surface heat fluxes over heterogeneous landscape of the Tibetan Plateau by using the MODIS and in situ data
复制标题
利用MODIS和实地数据测定青藏高原异质地貌地表热通量
DOI：
10.5194/acp-11-10461-2011
复制
发表时间：
2011-10
影响因子：
6.3
通讯作者：
Li, Maoshan
中科院分区：
文献类型：
--
作者：
Ma, Yaoming;Zhong, Lei;Wang, Binbin;Ma, Weiqiang;Chen, Xuelong;Li, Maoshan
抽象的。本文提出了一种基于MODIS(中分辨率成像光谱仪)和现场数据的参数化方法，并对其进行了检验，以求取区域地表反射率、地表温度、净辐射通量、土壤热通量、感热通量和潜热通量。作为实例研究，将该方法应用于青藏高原地区。利用MODIS数据的四幅图像(2007年1月30日、2007年4月15日、2007年8月1日和2007年10月25日)对冬季、春季、夏季和秋季进行了比较。利用西藏观测研究平台(TORP)测站的“地面真实”数据验证了所得结果。结果表明，青藏高原地区4个不同季节的地表参数(地表反射率和地表温度)和地表热通量(净辐射通量、土壤热通量、感热通量和潜热通量)与地表状况有较好的一致性。由于青藏高原地表地貌的强烈反差，这些参数表现出很大的变化范围。估算的地表变量和地表热通量与地面实测值吻合较好，验证点的绝对百分比误差均小于10%。结果表明，利用MODIS和青藏高原地区的现场资料进行地表热通量和地表热通量的反演是成功的。并讨论了该方法的不足之处和进一步改进的方向。
Abstract. In this study, a parameterization methodology based on MODIS (Moderate Resolution Imaging Spectroradiometer) and in situ data is proposed and tested for deriving the regional surface reflectance, surface temperature, net radiation flux, soil heat flux, sensible heat flux and latent heat flux over heterogeneous landscape. As a case study, the methodology was applied to the Tibetan Plateau area. Four images of MODIS data (30 January 2007, 15 April 2007, 1 August 2007 and 25 October 2007) were used in this study for the comparison among winter, spring, summer and autumn. The derived results were also validated by using the "ground truth" measured in the stations of the Tibetan Observation and Research Platform (TORP). The results show that the derived surface variables (surface reflectance and surface temperature) and surface heat fluxes (net radiation flux, soil heat flux, sensible heat flux and latent heat flux) in four different seasons over the Tibetan Plateau area are in good accordance with the land surface status. These parameters show a wide range due to the strong contrast of surface features over the Tibetan Plateau. Also, the estimated land surface variables and surface heat fluxes are in good agreement with the ground measurements, and all their absolute percent difference (APD) is less than 10% in the validation sites. It is therefore concluded that the proposed methodology is successful for the retrieval of land surface variables and surface heat fluxes using the MODIS and in situ data over the Tibetan Plateau area. The shortage and further improvement of the methodology were also discussed.