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HydroSat: geometric quantities of the global water cycle from geodetic satellites
Earth System Science Data ( IF 11.4 ) Pub Date : 2022-05-25 , DOI: 10.5194/essd-14-2463-2022
Mohammad J. Tourian, Omid Elmi, Yasin Shafaghi, Sajedeh Behnia, Peyman Saemian, Ron Schlesinger, Nico Sneeuw

Against the backdrop of global change, in terms of both climate and demography, there is a pressing need for monitoring of the global water cycle. The publicly available global database is very limited in its spatial and temporal coverage worldwide. Moreover, the acquisition of in situ data and their delivery to the database have been in decline since the late 1970s, be it for economical or political reasons. Given the insufficient monitoring from in situ gauge networks, and with no outlook for improvement, spaceborne approaches have been under investigation for some years now. Satellite-based Earth observation with its global coverage and homogeneous accuracy has been demonstrated to be a potential alternative to in situ measurements. This paper presents HydroSat as a database containing geometric quantities of the global water cycle from geodetic satellites. HydroSat provides time series and their uncertainty in water level from satellite altimetry, surface water extent from satellite imagery, terrestrial water storage anomaly represented in equivalent water height from satellite gravimetry, lake and reservoir water volume anomaly from a combination of satellite altimetry and imagery, and river discharge from either satellite altimetry or imagery. The spatial and temporal coverage of these datasets varies and depends on the availability of geodetic satellites. These products, which are complementary to existing products, can contribute to our understanding of the global water cycle within the Earth system in several ways. They can be incorporated for hydrological modeling, they can be complementary to current and future spaceborne observations, and they can define indicators of the past and future state of the global freshwater system. HydroSat is publicly available through http://hydrosat.gis.uni-stuttgart.de (last access: 18 May 2022​​​​​​​). Moreover, a snapshot of all the data (taken in April 2021) is available in GFZ Data Services at https://doi.org/10.5880/fidgeo.2021.017 (Tourian et al., 2021).

中文翻译:

HydroSat:来自大地测量卫星的全球水循环的几何量

在全球变化的背景下,无论是气候还是人口,都迫切需要监测全球水循环。可公开获得的全球数据库在全球范围内的时空覆盖范围非常有限。此外,自 1970 年代后期以来,无论是出于经济原因还是政治原因,现场数据的获取及其向数据库的传输一直在下降。鉴于现场测量网络的监测不足,并且没有改进的前景,多年来一直在研究星载方法。基于卫星的地球观测具有全球覆盖范围和均一的精度,已被证明是原位测量的潜在替代方案。本文将 HydroSat 介绍为一个数据库,其中包含来自大地测量卫星的全球水循环的几何量。HydroSat 提供来自卫星测高的水位时间序列及其不确定性、来自卫星图像的地表水范围、来自卫星重力测量的等效水高表示的陆地储水异常、来自卫星测高和图像的组合的湖泊和水库水量异常,以及来自卫星测高或图像的河流流量。这些数据集的空间和时间覆盖范围各不相同,取决​​于大地测量卫星的可用性。这些产品是对现有产品的补充,可以通过多种方式帮助我们了解地球系统内的全球水循环。它们可以用于水文建模,它们可以补充当前和未来的星载观测,并且可以定义全球淡水系统过去和未来状态的指标。HydroSat 可通过以下方式公开获得http://hydrosat.gis.uni-stuttgart.de(最后访问时间:2022 年 5 月 18 日​​​​​​​​)。此外,GFZ 数据服务中提供了所有数据的快照(拍摄于 2021 年 4 月),网址为https://doi.org/10.5880/fidgeo.2021.017(Tourian 等人,2021)
更新日期:2022-05-25
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