高原气象

高原气象 >

2019 , Vol. 38 >Issue 1: 88 - 100

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00097

论文

GLASS、MODIS和GlobAlbedo反照率产品在青藏高原典型高寒草地的适用性评估

  • 安颖颖 ,
  • 孟宪红 ,
  • 赵林 ,
  • 李照国 ,
  • 吕世华 ,
  • 马御棠
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  • 中国科学院西北生态环境资源研究院/寒旱区陆面过程与气候变化重点实验室, 甘肃 兰州 730000;甘肃省武威市气象局, 甘肃 武威 733000;中国科学院大学, 北京 100049;成都信息工程大学大气科学学院 高原大气与环境四川省重点实验室, 四川 成都 610225;南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏 南京 210044;云南电网有限责任公司电力科学研究院, 云南 昆明 650217

收稿日期: 2018-06-23

  网络出版日期: 2019-02-28

基金资助

国家自然科学基金项目（41822501，91437102，41375015，41775016）；中国科学院寒区旱区环境与工程研究所青年STS项目（Y651671001）；中国科学院创新促进会会员经费（2014384）；公益性行业（气象）科研专项（GYHY201506001-04）；云南电网公司科技项目（YNKJXM20160032）

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Evaluation the Applicability of Albedo Products of GLASS, MODIS and GlobAlbedo under the Alpine Meadow over the Qinghai-Tibetan Plateau

  • AN Yingying ,
  • MENG Xianhong ,
  • ZHAO Lin ,
  • LI Zhaoguo ,
  • Lü Shihua ,
  • MA Yutang
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  • Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Region, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;Wuwei Meteorological Bureau, Wuwei 733000, Gansu, China;University of Chinese Academy of Science, Beijing 100049, China;Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, Sichuan, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China;Yunnan Power Grid Company Limited, Kunming 650217, Yunnan, China

Received date: 2018-06-23

  Online published: 2019-02-28

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摘要

地表反照率是表征陆面过程地表能量收支的关键物理参数，对于准确以及定量化地理解高原上的能量和水分循环过程有着至关重要的作用。利用黄河源区玛曲和玛多两个高寒草地站点长达8年的地表反照率观测数据，对GLASS（Global Land Surface Satellite）、MODIS（Moderate Resolution Imaging Spectroradiometer）和GlobAlbedo地表反照率产品进行了评估与分析。结果显示，玛曲地表反照率的年际变化较小，集中在0.16~0.28。各遥感产品在玛曲地区精度各有不同：GlobAlbedo反照率平均比地面观测偏高0.048；而GLASS和MODIS反照率分别偏低0.074和0.063。统计值表明，MODIS产品精度相对最高，其中RMSE=0.069，R=0.710。受积雪影响，玛多地区地表反照率年际变化较大。遥感产品中，GLASS产品精度相对较高，其中RMSE=0.104，R=0.598。玛曲站地表反照率值为：冬季>春季>秋季>夏季，平均值依次为0.25，0.22，0.19和0.18。玛曲站年平均地表反照率为0.21；玛多站为0.25，而且季节变化较玛曲站更显著，呈现近似"U"形分布。夏季反照率最小，平均值为0.18，秋季为0.22，与春季较为接近，冬季平均值最大为0.33。基于两个观测站点的对比表明，三种遥感地表反照率产品春夏季与地面观测一致性较好，秋季反照率开始增大的时间比观测早，冬季后期反照率的值明显小于地面观测。另外，GLASS和MODIS产品的差异也在秋冬季达到最大。MODIS分离雪和云的能力使其在秋冬季的表现更好。

关键词： 地表反照率; GLASS; MODIS; GlobAlbedo; 评估

本文引用格式

安颖颖 , 孟宪红 , 赵林 , 李照国 , 吕世华 , 马御棠 . GLASS、MODIS和GlobAlbedo反照率产品在青藏高原典型高寒草地的适用性评估[J]. 高原气象, 2019 , 38(1) : 88 -100 . DOI: 10.7522/j.issn.1000-0534.2018.00097

Abstract

Surface albedo is a key physical parameter affecting the energy budget and crucial for accurately and quantitatively estimating the energy and water cycle processes on the Tibetan Plateau. Based on the eight years' observations of surface albedo under the alpine meadow over Maqu and Maduo stations in the source region of the Yellow River, the remote sensing products of Global Land Surface Satellite (GLASS), Moderate Resolution Imaging Spectroradiometer (MODIS) and GlobAlbedo were evaluated and analyzed. The results show that the observed albedo of Maqu concentrated in 0.16~0.28 from 2009 to 2016. The GlobAlbedo albedo is greater than the mean observation by 0.048, while the GLASS and MODIS are below the observed value by 0.074 and 0.063, respectively. Relatively, MODIS is closest to the Maqu observation, with RMSE=0.069 and R=0.710.The observed surface albedo at Maduo has a large interannual variation due to the snow effects. GLASS is the highest stability product comparing with the Maduo observation, with RMSE=0.104 and R=0.598. The observed seasonal variation of surface albedo of Maqu is:winter > spring > autumn > summer, with the average of albedo is 0.25, 0.22, 0.19 and 0.18, respectively. The observed annual albedo of Maqu is 0.21; and that of Maduo is 0.25. Seasonal variation in albedo of Maduo is more significant than that of Maqu, which shows the typical "U" structure. The seasonal mean of observation in Maduo station is 0.18 (summer), 0.22 (spring and autumn) and 0.33 (winter). Generally, the consistency of the three surface albedo products with the observations is relatively high in spring and summer, but the increase in the albedo of the three products is earlier than observations in autumn and the albedo is significantly smaller than observations in the late winter or early spring. In addition, for the two sites, the maximum bias between GLASS and MODIS products occur in the autumn and winter, which further demonstrates systematic bias in the snow mapping algorithms of these surface albedo products, and MODIS performs better because of the ability to separate snow from clouds.

Key words： Surface albedo; GLASS; MODIS; GlobAlbedo; evaluation

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