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云贵地区几种潜在蒸散发产品质量评估

黄瑾,王文,崔巍,王鹏   

  • 出版日期:2019-12-28 发布日期:2019-12-28

Evaluation of several evapotranspiration products over Yunnan-Guizhou region in China

HUANG Jin, WANG Wen, CUI Wei, WANG Peng   

  • Online:2019-12-28 Published:2019-12-28

摘要: 以2000~2014年云南和贵州地区42个站点观测的实测蒸发皿蒸发量数据(Epan)为基准,对GLDAS-2.1 Noah模型模拟得到的潜在蒸散发量(GLDAS_ETp)和MODIS MOD16潜在蒸散发产品(MOD16_ETp),以及利用GLDAS-2.0、GLDAS-2.1气象数据结合Penman-Monteith公式分别计算得到的逐月潜在蒸散发量数据(PM_ETp_2.0和PM_ETp_2.1),从时间和空间分布上对各数据质量进行了评估。结果表明:4套数据在贵州、云南中部和东部地区都与Epan有较好的相关性,逐月序列的总体相关性均大于0.9;PM_ETp_2.0总体负偏约13.3%,空间分布与Epan最接近,数据质量的季节波动最小,与Epan的均方根误差约12.9 mm/月;MOD16_ETp和PM_ETp_2.1在贵州地区的精度较差,总体正偏均超过50%,尤其在夏半年;而GLDAS_ETp的数据总体精度最差,与Epan的均方根误差约53.7 mm/月,且3~5月大幅正偏,与Epan的偏差均超过60%。

关键词: 潜在蒸散发模拟, MODIS MOD16, GLDAS, 精度分析, 数据评估, 云贵高原

Abstract: The pan-observed evaporation (Epan) at 42 sites from 2000 to 2014 in Yunnan-Guizhou region were used to evaluate the ETp products from GLDAS_ETp simulated by GLDAS-2.1 Noah model, MOD16 (MOD16_ETp) modelling based on MODIS satellite data, and the calculated monthly ETp data using the Penman-Monteith method based on GLDAS-2.0 and GLDAS-2.1 forcing data (PM_ETp_2.0 and PM_ETp_2.1). The results showed that, these four data sets have good correlation with Epan in Guizhou, central and eastern Yunnan, and the overall monthly data correlations of these products all exceed 0.9;although PM_ETp_2.0 is negative biased, it outperforms the others in terms of seasonal stability and spatial distribution (RMSE=12.9 mm/month,MRAE=13.3%). Besides, MOD16_ETp and PM_ETp_2.1 performs less than PM_ETp_2.0, with overall positive MRAEs over 50%, especially in the summer half year; data quality of GLDAS_ETp is the poorest (RMSE=53.7 mm/month), with great positive bias especially from March to May (MRAE > 60%).

Key words: potential evapotranspiration simulation, MODIS MOD16, GLDAS, precision analysis , data evaluation, Yunnan-Guizhou plateau