Type: Article
Title: Influence of GIA Uncertainty on Climate Model Evaluation With GRACE/GRACE‐FO Satellite Gravimetry Data
Authors: Eicker, Annette 
Schawohl, Lennart 
Middendorf, Klara 
Bagge, Meike
Jensen, Laura 
Dobslaw, Henryk
Issue Date: May-2024
Keywords: climate models; CMIP; glacial isostatic adjustment; GRACE; satellite gravimetry
Global coupled climate models are in continuous need for evaluation against independent observations to reveal systematic model deficits and uncertainties. Changes in terrestrial water storage (TWS) as measured by satellite gravimetry missions GRACE and GRACE-FO provide valuable information on wetting and drying trends over the continents. Challenges arising from a comparison of observed and modelled water storage trends are related to gravity observations including non-water related variations such as, for example, glacial isostatic adjustment (GIA). Therefore, correcting secular changes in the Earth's gravity field caused by ongoing GIA is important for the monitoring of long-term changes in terrestrial water from GRACE in particular in former ice-covered regions. By utilizing a new ensemble of 56 individual realizations of GIA signals based on perturbations of mantle viscosities and ice history, we find that many of those alternative GIA corrections change the direction of GRACE-derived water storage trends, for example, from gaining mass into drying conditions, in particular in Eastern Canada. The change in the sign of the TWS trends subsequently impacts the conclusions drawn from using GRACE as observational basis for the evaluation of climate models as it influences the dis-/agreement between observed and modelled wetting/drying trends. A modified GIA correction, a combined GRACE/GRACE-FO data record extending over two decades, and a new generation of climate model experiments leads to substantially larger continental areas where wetting/drying trends currently observed by satellite missions coincide with long-term predictions obtained from climate model experiments.
Subject Class (DDC): 550: Geowissenschaften
HCU-Faculty: Geodäsie und Ausgleichungsrechnung 
Journal or Series Name: Journal of Geophysical Research: Solid Earth 
Volume: 129
Issue: 5
Publisher: Wiley
ISSN: 2169-9313
Publisher DOI: 10.1029/2023JB027769
URN (Citation Link): urn:nbn:de:gbv:1373-repos-13030
Directlink: https://repos.hcu-hamburg.de/handle/hcu/1014
Language: English
Creative Commons License: https://creativecommons.org/licenses/by/4.0/
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