藏北高原GlobAlbedo地表反照率的精度分析

陈爱军;周婵;卞林根;刘玉洁

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高原气象
高原气象 ›› 2016, Vol. 35 ›› Issue (4) : 887-894. DOI: 10.7522/j.issn.1000-0534.2015.00097
论文

藏北高原GlobAlbedo地表反照率的精度分析

  • 陈爱军;周婵;卞林根;刘玉洁
作者信息 +

Assessment on Accuracy of GlobAlbedo over the Northern Qinghai-Xizang Plateau

  • CHEN Aijun;ZHOU Chan;BIAN Lingen;LIU Yujie
Author information +
History +

摘要

为了分析欧洲航天局多星观测数据联合反演的全球地表反照率产品GlobAlbedo在青藏高原的反演精度，促进其在青藏高原地-气相互作用研究中的应用，利用藏北高原BJ站和西大滩站观测的上行和下行太阳短波辐射资料，对比分析了GlobAlbedo的精度，并与MODIS地表反照率产品MCD43B3进行了比较。结果表明：空间分辨率1 km的GlobAlbedo短波波段（0.3～5.0 μm）的地表反照率与地面观测结果总体上具有较好的一致性，但是精度受积雪覆盖比例的影响较大。积雪覆盖比例<0.1时，globalbedo短波波段的地表反照率与高质量地面观测结果的均方根误差介于0.0100～0.0218，globalbedo的精度完全能够满足气候和陆面模式的精度要求。反之，它们的均方根误差介于0.0252～0.1461，存在较大的不确定性。对比globalbedo和mcd43b3，前者的精度略高于后者：globalbedo短波波段地表反照率与高质量地面观测结果的均方根误差介于0.0195～0.0959，mcd43b3短波波段地表反照率与高质量地面观测结果的均方根误差介于0.0273～0.1269。>

Abstract

Retrieved with the combined data from multiple satellites, the GlobAlbedo provides the global land surface albedo (LSA) product, and it is delivered by the European Space Agency (ESA). To evaluate the accuracy of the GlobAlbedo and advance its application in the study of the earth-atmosphere interaction over the Qinghai-Xizang Plateau, the ground-observed solar shortwave radiation data from BJ and XDT stations, located over the Northern Qinghai-Xizang Plateau, were used to make comparison with the GlobAlbedo. Besides, the comparison was also made between the GlobAlbedo and the Moderate Resolution Imaging Spectroradiometer LSA product MCD43B3. Results revealed that: The shortwave band (0.3~5.0 μm) land surface albedos from the GlobAlbedo in 1 km resolution were totally in rather well agreement with the ground-observed land surface albedo, but their accuracy were significantly influenced by the snow fraction (SF). The root-mean-square errors (RMSEs) between the actual land surface albedos from GlobAlbedo and the high-quality ground-observed land surface albedos fell in between 0.0100 and 0.0218 when the SF was less than 0.1, and the accuracy of GlobAlbedo could meet the requirements of the land surface process and climate models. Otherwise, they fell in between 0.0252 and 0.1461 and there were some uncertainty in the accuracy of GlobAlbedo. When compared with MCD43B3, the GlobAlbedo has a slightly better accuracy than MCD43B3. The RMSEs between the actual land surface albedos from GlobAlbedo and the high-quality ground-observed land surface albedos fell in between 0.0195 and 0.0959, while those between the actual land surface albedos from MCD43B3 and the high-quality ground-observed albedos fell in between 0.0273 and 0.1269.

关键词

青藏高原 / 地表反照率 / GlobAlbedo / MCD43B3

Key words

The Qinghai-Xizang P / Land Surface Albedo / GlobAlbedo / MCD43B3

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陈爱军;周婵;卞林根;刘玉洁. 藏北高原GlobAlbedo地表反照率的精度分析. 高原气象. 2016, 35(4): 887-894 https://doi.org/10.7522/j.issn.1000-0534.2015.00097
陈爱军;周婵;卞林根;刘玉洁. Assessment on Accuracy of GlobAlbedo over the Northern Qinghai-Xizang Plateau. Plateau Meteorology. 2016, 35(4): 887-894 https://doi.org/10.7522/j.issn.1000-0534.2015.00097

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基金

国家自然科学基金项目（40875015）
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