Evaluation of GLEAM and MOD16 evapotranspiration products in the central and southeastern lake basins of the Qinghai-Tibet Plateau

GLEAM （Global Land Evapotranspiration Amsterdam Model）和MOD16（MODIS Global Project）全球蒸散发产品已经得到了广泛的检验和应用，但由于观测资料缺乏，尚缺少对高原地区的检验。本文以青藏高原然乌湖流域、羊卓雍错流域、纳木错流域、色林错流域和塔若错流域为检验区域，利用流域水量平衡法，采用相关系数、相对误差、均方根误差和Kling-Gupta系数，对这两种蒸散产品开展了精度验证与评价。结果表明：GLEAM蒸散发产品在然乌湖、色林错和塔若错流域整体存在低估现象，在羊卓雍错和纳木错流域存在轻微高估现象，而MOD16产品仅在色林错流域有轻微低估现象，在其他湖泊流域均表现为高估；GLEAM和MOD16蒸散发产品在5个湖泊流域年降水量较少的年份均存在高估的现象，在湿润年份则为低估；GLEAM产品在然乌湖流域、羊卓雍错流域和色林错流域的验证结果相对较好，而MOD16产品在纳木错流域和塔若错流域的验证精度相对较高；总体而言，在年尺度和多年平均尺度下，GLEAM蒸散发产品在青藏高原中东南湖泊流域的精度明显优于MOD16产品。本文的研究结果为适用于青藏高原地区蒸散发产品的甄选提供了重要参考。;Global evapotranspiration products from (Global Model) and MOD16 (MODIS Project) have been widely validated applied. However, due to insufficient observational data, there is still a lack of validation in plateau areas. This study took Lake Ranwu, Yamzho YumCo, Nam Co, Siling Co Taro basins as area, applied basin water balance, correlation coefficient, relative error, root mean square error Kling-Gupta coefficient verify evaluate the accuracy Qinghai-Tibet Plateau. The results demonstrated that were underestimated basins, slightly overestimated YumCo while other lake basins. dry year, wet year five showed high had In general, was significantly better than central southeastern Plateau on annual scale multi-year average scale. provided an important reference for selection suitable