柴达木盆地多元信息融合遥感蒸散发估算被引量：1

Remote sensing evapotranspiration estimation with multisource data fusion for Qaidam Basin

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摘要蒸散发是水循环中水量、能量平衡的关键过程。REDRAW模型对典型遥感蒸散发模型SEBAL干湿限选取方式进行改进,使用理论计算法估算干湿限地表温度以降低空间歧义性。为检验这两个模型在柴达木地区的适用性,以及气象校正对于蒸散发的敏感性,文中使用ERA5再分析数据、地表站点观测融合作为气象输入,采用REDRAW和SEBAL两种单源遥感蒸散发模型反演柴达木盆地2001-2020年1km×1km分辨率逐月蒸散发,由此求得多年平均蒸散发并水量平衡闭合验证。结果表明:REDRAW模型估算的柴达木盆地年均蒸散发为178.5mm,水量平衡闭合度为89.2%,较SEBAL模型能更好地描述该区域蒸散发特征;基于随机森林模型的气象校正算法可以纠正ERA5再分析数据的系统性偏差,能一定程度上消除缺乏气象站点观测引起的蒸散发估算误差。 Evapotranspiration is the key process between water balance and energy balance.REDRAW model,an enhanced version of SEBAL regarding to endmembers selection,eliminates spatial ambiguity via theoretical determination of wet and dry limits.To testify the adaptability of the two models,as well as the sensitivity of meteorology calibration,we use merge meteorology forcing of ground observation and ERA5 reanalysis data in this study.Then the monthly spatial pattern of evapotranspiration from 2001 to 2020 is reconstructed by REDRAW model and SEBAL model at 1 km×1 km resolution and verified with water balance equation.It is demonstrated that the multi-year average evapotranspiration in the Qaidam Basin estimated by the REDRAW model is 178.5 mm,with the water balance closure rate achieving 89.2%,implying a more accurate estimation of the energy redistribution via REDRAW than SEBAL in the Qaidam basin.Besides,the meteorological correction reduces systematic bias of reanalysis data,capable of mitigating the problem due to the lack of in-situ observation.

作者董靓王忠静索滢 DONG Liang;WANG Zhongjing;SUO Ying(Department of Hydraulic Engineering,Tsinghua University,Beijing 100084;State Key Laboratory of Hydro-Science and Engineering,Tsinghua University,Beijing 100084;Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China,Ningxia University,Yinchuan 750021,China)

机构地区清华大学水利系清华大学水沙科学与水利水电工程国家重点实验室宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地

出处《干旱区资源与环境》 CSSCI CSCD 北大核心 2023年第1期65-73,共9页 Journal of Arid Land Resources and Environment

基金国家重点研发计划项目(2022YFE0101100) 青海省重大科技计划项目(2019-SF-A4-6)资助

关键词遥感蒸散发参考干湿限水量平衡融合校正柴达木盆地 remote sensing evapotranspiration reference dry and wet limit water balance fusion calibration Qaidam Basin

分类号 P426.2 [天文地球—大气科学及气象学]

作者简介董靓(1997-),女,汉族,博士研究生,主要从事遥感水文学研究。E-mail:dong-j20@mails.tsinghua.edu.cn;通讯作者:王忠静(1963-),男,汉族,教授,主要从事水文水资源工作。E-mail:zj.wang@tsinghua.edu.cn