气候变化领域集成服务门户(CCPortal): Assessing Global Present-Day Surface Mass Transport and Glacial Isostatic Adjustment From Inversion of Geodetic Observations

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DOI	10.1029/2020JB020713
	Assessing Global Present-Day Surface Mass Transport and Glacial Isostatic Adjustment From Inversion of Geodetic Observations
	Jiang Y.; Wu X.; van den Broeke M.R.; Kuipers Munneke P.; Simonsen S.B.; van der Wal W.; Vermeersen B.L.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Long-term monitoring of global mass transport within the Earth system improves our ability to mitigate natural hazards and better understand their relations to climate change. Satellite gravity is widely used to monitor surface mass variations for its unprecedented spatial and temporal coverage. However, the gravity data contain signals from visco-elastic deformation in response to past ice sheet melting, preventing us from extracting signals of present-day surface mass trend (PDMT) directly. Here we present a global inversion scheme that separates PDMT and visco-elastic glacial isostatic adjustment (GIA) signatures by combining satellite gravimetry with satellite altimetry and ground observations. Our inversion provides global dual data coverage that enables a robust separation of PDMT and GIA spherical harmonic coefficients. It has the advantage of providing estimates of Earth's long wavelength deformation signatures and their uncertainties. Our GIA result, along with its uncertainty estimates, can be used in future GRACE processing to better assess the impact of GIA on surface mass change. Our GIA estimates include a rapid GIA uplift in the Southeast Alaska and the Amundsen Sea Embayment, due to the visco-elastic response to recent glacial unloading. We estimate the average surface mass change rate from 2002–2010 to be −203 ± 3 GT·a−1 in Greenland, −126 ± 18 GT·a−1 in Antarctica and, −62 ± 5 GT·a−1 in Alaska. The GIA low degree spherical harmonic coefficients are sensitive to rheological properties in Earth's deep interior. Our low-degree GIA estimates include geocenter motion and (Formula presented.) which provide unique constraints to understand Earth's lower mantle and ice history. © 2021. Her Majesty the Queen in Right of Canada. Journal of Geophysical Research. Reproduced with the permission of the Minister of Natural Resources Canada.
英文关键词	geodesy; gravity; inversion; mass change
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187114
作者单位	Natural Resources Canada, Geological Survey of Canada, Sidney, Canada; School of Earth and Ocean Science, University of Victoria, Victoria, Canada; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands; DTU Space—National Space Institute, Technical University of Denmark, Lyngby, Denmark; Faculty of Aerospace Engineering and Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands; Department of Estuarine and Delta Systems EDS, NIOZ Royal Netherlands Institute for Sea Research, Yerseke, Netherlands
推荐引用方式 GB/T 7714	Jiang Y.,Wu X.,van den Broeke M.R.,et al. Assessing Global Present-Day Surface Mass Transport and Glacial Isostatic Adjustment From Inversion of Geodetic Observations[J],2021,126(5).
APA	Jiang Y..,Wu X..,van den Broeke M.R..,Kuipers Munneke P..,Simonsen S.B..,...&Vermeersen B.L..(2021).Assessing Global Present-Day Surface Mass Transport and Glacial Isostatic Adjustment From Inversion of Geodetic Observations.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Jiang Y.,et al."Assessing Global Present-Day Surface Mass Transport and Glacial Isostatic Adjustment From Inversion of Geodetic Observations".Journal of Geophysical Research: Solid Earth 126.5(2021).