干旱区生态环境知识资源中心(Arid): Lake and reservoir volume variations in South America from radar altimetry, ICESat laser altimetry, and GRACE time-variable gravity

Arid

DOI	10.1016/j.asr.2020.04.022
	Lake and reservoir volume variations in South America from radar altimetry, ICESat laser altimetry, and GRACE time-variable gravity
	Carabajal, Claudia C.; Boy, Jean-Paul
通讯作者	Carabajal, CC (corresponding author), NASA, HEXAGON US Fed Inc, Goddard Space Flight Ctr, Geodesy & Geophys Lab, Code 61A, Greenbelt, MD 20771 USA.
来源期刊	ADVANCES IN SPACE RESEARCH
ISSN	0273-1177
EISSN	1879-1948
出版年	2021
卷号	68 期号:2 页码:652-671
英文摘要	Thanks to 25-years of radar altimetry measurements from TOPEX/POSEIDON, Jason 1, 2 and 3, ENVISAT and others, water level changes of major lakes and rivers can be measured regularly, remotely, with unprecedented precision, facilitating monitoring of continental water storage variations. In addition, the 18 laser altimeter measurement campaigns over 6 years by the Ice, Cloud and Land Elevation Satellite (ICESat) satellite complement these radar altimetry measurements and also validate them, expanding our monitoring capabilities. We extract derived water height estimates for various lakes in South America from radar and laser altimetry measurements. Using available imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS), we estimate time-variable surface extent of these water bodies, and together with the altimetry, we derive corresponding estimates of relative volume variations for a number of lakes and reservoirs in South America. We see good agreement between our water extent and available products, with some differences when snow covered area are present. We find good agreement between the temporal variations of lake water heights obtained from ICE Sat, radar altimetry, and in situ measurements, when available. Lake-dependent biases still exist, likely due to differences in reference datum, choice of geoid model, and differences in data processing schemes. The is a good agreement in volume changes obtained from imagery and the various altimetry techniques. Furthermore, using the latest one-degree global iterated mascon solutions from NASA Goddard Space Flight Center, we successfully compare them to independent volume changes assessments for these water bodies, derived from mass variations from time-variable gravity measurements from 15 years of Gravity Recovery And Climate Experiment (GRACE) observations. The agreement in water volume changes from GRACE with those from altimetry and imagery is higher for lakes in arid and semi-arid regions than on mountainous areas. GRACE volume estimates remain limited to the spatial resolution and the quality of the hydrology models used to correct for soil-moisture and snow contributions. Overall, studies like the one presented here further validate the power of leveraging these data synergies to monitor continental water storage changes from space, taking advantage of what each of the techniques has to offer. We show that water level measurements from laser and radar altimeters have similar precision, of a few centimeters over inland water bodies, and prove that GRACE global mascons allow to retrieve small lake relative volume changes, even for small bodies, thanks to their higher sensitivity to small wavelength mass variations. (C) 2020 COSPAR. Published by Elsevier Ltd. All rights reserved.
英文关键词	Radar altimetry Laser altimetry Time-variable gravity Inland water ICESat GRACE MODIS
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000659787700005
WOS关键词	WATER-LEVEL ; TIBETAN PLATEAU ; VARIABILITY ; STORAGE ; ANTARCTICA ; EVOLUTION ; DROUGHTS ; REGIONS ; SERIES ; POOPO
WOS类目	Engineering, Aerospace ; Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向	Engineering ; Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349279
作者单位	[Carabajal, Claudia C.] NASA, HEXAGON US Fed Inc, Goddard Space Flight Ctr, Geodesy & Geophys Lab, Code 61A, Greenbelt, MD 20771 USA; [Boy, Jean-Paul] Univ Strasbourg, EOST IPGS, UMR 7516, CNRS, 5 Rue Rene Descartes, F-67084 Strasbourg, France
推荐引用方式 GB/T 7714	Carabajal, Claudia C.,Boy, Jean-Paul. Lake and reservoir volume variations in South America from radar altimetry, ICESat laser altimetry, and GRACE time-variable gravity[J],2021,68(2):652-671.
APA	Carabajal, Claudia C.,&Boy, Jean-Paul.(2021).Lake and reservoir volume variations in South America from radar altimetry, ICESat laser altimetry, and GRACE time-variable gravity.ADVANCES IN SPACE RESEARCH,68(2),652-671.
MLA	Carabajal, Claudia C.,et al."Lake and reservoir volume variations in South America from radar altimetry, ICESat laser altimetry, and GRACE time-variable gravity".ADVANCES IN SPACE RESEARCH 68.2(2021):652-671.