MODIS MOD16蒸散发产品在中国流域的质量评估
Evaluation of MODIS MOD16 Evaportranspiration Product in Chinese River Basins
查看参考文献16篇
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文摘
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利用地面观测降水数据、流量数据,以及重力卫星(GRACE)观测的与全球陆面数据同化系统(GLDAS)模拟的流域蓄水量变化数据,基于流域水量平衡原理,从年与月两个时间尺度分析了MODIS全球蒸散发产品(MOD16)在中国不同流域的一致性及其时空特征。结果表明: 1)年尺度上,MOD16/ET在中国流域(除松花江流域)与基于水量平衡估算的流域实际ET(WBET)相比呈现高估,且在不同集水区高估程度不同,与流域实际ET的差异从北方的松花江流域、黄河流域到南方的长江流域有从小到大的特点;2)月尺度上,MOD16/ET与WBET相比,存在低值区(<20 mm/月)高估、高值区(>20 mm/月)低估的特点;在蒸散发过程较弱的11月到次年3月,MOD16/ET产品在中国流域存在普遍性高估;而在其他月份,MOD16/ET与WBET的一致性因流域而异;3)MOD16/ET与WBET的一致性在中国不同流域存在地域性差异,总体上在外流区的一致性优于内流区,在北方松花江流域的一致性优于南方的长江流域。 |
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其他语种文摘
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MODIS MOD16 evapotranspiration (ET) product is widely used in various applications in geosciences, and the product has been evaluated by many researchers in different regions over the world. However, when evaluating the ET product on catchment scales, previous studies were conducted on the annual scale under the assumption of no terrestrial water storage (TWS) change. But the annual TWS change is not negligible, and ignoring the TWS change may result in big biases when evaluating MOD16/ET product. In addition, the use of ET product on monthly scale is often required in many applications. In the present study, the monthly MODIS MOD16/ET product of Chinese river basins during 2002- 2013 are compared with actual evapotranspiration (WBET) which is calculated based on the principle of water balance from ground observed precipitation data, discharge data, GRACE satellite observed terrestrial water storage (TWS) data and Global Land Data Assimilation System (GLDAS) simulated TWS data. The results show that: 1) on the annual scale, MOD16/ ET is overestimated except for Songhua River Basin, and the difference between MOD16/ET and WBET increases from the Songhua River Basin in the north to the Yangtze River Basin in the south; 2) on the monthly scale, MOD16/ET tends to be overestimated compared to WBET in low value range (<20 mm/month) and underestimated in high value range (>20 mm/month), and the overestimation is prevalent across China in the period from November to March, but the consistency between MOD16/ET and WBET differs among the catchments in other months; 3) the consistency between monthly MOD16/ET and WBET is better in exorheic basins than in endorheic basin, better in the Songhua River Basin in northeastern China than in the Yangtze River Basin in the southern China. |
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来源
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自然资源学报
,2017,32(3):517-528 【核心库】
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DOI
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10.11849/zrzyxb.20160440
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关键词
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MODIS数据
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蒸散发
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GLDAS
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GARCE
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地址
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河海大学, 水文水资源与水利工程科学国家重点实验室, 南京, 210098
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-3037 |
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学科
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大气科学(气象学) |
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基金
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国家教育部高等学校博士学科点专项科研基金
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文献收藏号
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CSCD:5948603
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