气候变化领域集成服务门户(CCPortal): Development of a Daily GRACE Mascon Solution for Terrestrial Water Storage

CCPortal

DOI	10.1029/2019JB018468
	Development of a Daily GRACE Mascon Solution for Terrestrial Water Storage
	Croteau M.J.; Nerem R.S.; Loomis B.D.; Sabaka T.J.
发表日期	2020
ISSN	21699313
卷号	125 期号:3
英文摘要	The Gravity Recovery and Climate Experiment (GRACE) and GRACE-Follow On missions have provided a global history of terrestrial water storage changes since 2002. Traditional GRACE products resolve monthly time-variable gravity at spatial resolutions of 300–500 km, with many recent efforts focusing on regularized mass concentration (mascon) solutions to better resolve signals spatially. However, monthly resolution inhibits the applicability of GRACE to investigations of sub-monthly signals. This study presents a new daily mass change solution estimated as deviations from the NASA Goddard Space Flight Center (GSFC) converged monthly mascon product and quantifies the fundamental trade-off between temporal and spatial resolution in GRACE-only solutions. As an iteration of the GSFC product, this daily solution represents a mixing of monthly information at higher relative spatial resolution with daily information at lower relative spatial resolution, resolving each temporal scale at the best resolution achievable without requiring hydrological model dependencies in the estimation. The resolution of the daily mascons is 300–400 km at high latitudes and 600–1,000 km lower, depending on each daily orbital track and the proximity of each mascon to constraint region boundaries (e.g., coastlines). Through simulations and model comparisons, we demonstrate that daily signals over areas larger than 400,000 km (Formula presented.) are recoverable, with basins larger than 800,000 km (Formula presented.) exhibiting strong signal recovery relative to leakage. This analysis establishes baselines for daily signal recovery from GRACE in the context of longer time scale solutions, characterizes leakage inherent in daily GRACE information, and creates new opportunities for applying GRACE to investigations of sub-monthly signals. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	daily GRACE; GRACE; mascons; terrestrial water storage; time-variable gravity
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/187903
作者单位	Colorado Center for Astrodynamics Research, University of Colorado Boulder, Boulder, CO, United States; Geodesy and Geophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Croteau M.J.,Nerem R.S.,Loomis B.D.,et al. Development of a Daily GRACE Mascon Solution for Terrestrial Water Storage[J],2020,125(3).
APA	Croteau M.J.,Nerem R.S.,Loomis B.D.,&Sabaka T.J..(2020).Development of a Daily GRACE Mascon Solution for Terrestrial Water Storage.Journal of Geophysical Research: Solid Earth,125(3).
MLA	Croteau M.J.,et al."Development of a Daily GRACE Mascon Solution for Terrestrial Water Storage".Journal of Geophysical Research: Solid Earth 125.3(2020).