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袁令, 马耀明, 陈学龙, 等. 2023. 青藏高原六套陆面蒸散发产品的评估[J]. 大气科学, 47(3): 893−906. doi: 10.3878/j.issn.1006-9895.2204.21208
引用本文: 袁令, 马耀明, 陈学龙, 等. 2023. 青藏高原六套陆面蒸散发产品的评估[J]. 大气科学, 47(3): 893−906. doi: 10.3878/j.issn.1006-9895.2204.21208
YUAN Ling, MA Yaoming, CHEN Xuelong, et al. 2023. Evaluation of Six Land Surface Evapotranspiration Products over the Tibetan Plateau [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(3): 893−906. doi: 10.3878/j.issn.1006-9895.2204.21208
Citation: YUAN Ling, MA Yaoming, CHEN Xuelong, et al. 2023. Evaluation of Six Land Surface Evapotranspiration Products over the Tibetan Plateau [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(3): 893−906. doi: 10.3878/j.issn.1006-9895.2204.21208

青藏高原六套陆面蒸散发产品的评估

Evaluation of Six Land Surface Evapotranspiration Products over the Tibetan Plateau

  • 摘要: 鉴于基于卫星遥感和地面观测开发出的不同时空分辨率蒸散发(ET)产品在青藏高原(TP)仍存在不确定性,从而限制了这些产品在水文气象和气候评估方面的应用。本文基于涡动观测的ET对六种ET产品(PML、EB-ET_V2、GLEAM、GLDAS、ERA5_Land和MOD16)进行评估并比较各产品之间的差异,对TP区域ET产品不确定性做了分析。结果表明:(1)观测值与对应像元ET值之间的年平均态和季节循环存在较好的相关性、一致性。GLEAM产品与观测值吻合度较高并拥有适用性;MOD16产品在大部分站点性能较差。(2)在季节性变化方面,春季ERA5_Land产品与观测的变化较为一致;夏季和冬季GLEAM产品与观测的变化更为接近,而EB-ET_V2产品在秋季表现更有优势。(3)在空间上,GLEAM、EB-ET_V2产品和GLDAS产品存在更高的相关性(相关系数R>0.88)和一致性(一致性指数IOA>0.89);各产品季节时空分布有较大的差异,尤其是春季;相对其他产品,MOD16产品在大部分区域夏季低估且冬季高估。(4)除MOD16外的各产品年平均ET大小相差较大,多年平均的高原ET大小排序为ERA5_Land(401.46 mm a−1)>PML(334.37 mm a−1)>GLEAM(298.46 mm a−1)>EB-ET_V2(271.39 mm a−1)>GLDAS(249.67 mm a−1),六套产品估算的青藏高原的总体年蒸发量为330.59 mm a−1。青藏高原不同蒸发产品的比较有助于对高原蒸发的动态变化有更深入的了解,可以为青藏高原水资源评估和区域水管理提供参考。

     

    Abstract: Uncertainties in the evapotranspiration (ET) products used in the Tibetan Plateau (TP) region were determined based on the data from satellite remote sensing and observations having different spatial and temporal resolutions, limiting their utility for hydrometeorological and climate assessment. Six ET (PML, EB-ET_V2, GLEAM, GLDAS, ERA5_Land, and MOD16) products were evaluated based on eddy observations, and the differences between the products were compared. Moreover, the uncertainties in ET products in the TP region were analyzed. The results of the analysis are as follows: (1) A good correlation and consistency exist in the mean state and seasonal cycle between the observed and ET values of the corresponding pixel. Moreover, GLEAM product exhibits a high degree of agreement with the observed values and has applicability, and MOD16 product exhibits poor performance at most sites. (2) In terms of seasonal changes, ERA5_Land product values are highly consistent with the observed changes during spring, GLEAM product values are nearly consistent with the observed changes during summer and winter, and EB-ET_V2 product values are highly consistent with observed values during autumn. (3) Spatially, GLEAM product has higher correlation (the correlation coefficient R>0.88) and consistency (index of agreement IOA>0.89) compared to those of EB-ET_V2 product and GLDAS product. Substantial differences exist in the temporal and spatial distribution of various products during different seasons, especially during spring. Compared with other products, MOD16 product is underestimated in summer and overestimated in winter in most regions. (4) The annual average ET for each product except for MOD16 product is considerably different. The annual average ET values of the remaining five products over multiple years arranged in descending order are as follows: ERA5_Land product (401.46 mm a−1)>PML product (334.37 mm a−1)>GLEAM product (298.46 mm a−1)>EB-ET_V2 product (271.39 mm a−1)>GLDAS product (249.67 mm a−1). The total annual evaporation in the TP region is 330.59 mm a−1. The assessment results provide a detailed understanding of the quality and dynamics of ET products in the TP region, which can serve as reference data for regional water management and water resource assessment in the TP region.

     

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