Article (Scientific journals)
Detecting a forced signal in satellite-era sea-level change
Richter, K.; Meyssignac, B.; Slangen, A. et al.
2020In Environmental Research Letters
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Abstract :
[en] In this study, we compare the spatial patterns of simulated geocentric sea-level change to observations from satellite altimetry over the period 1993-2015 to assess whether a forced signal is detectable. This is challenging, as on these time scales internal variability plays an important role and may dominate the observed spatial patterns of regional sea-level change. Model simulations of regional sea-level change associated with sterodynamic sea level, atmospheric loading, glacier mass change, and ice-sheet surface mass balance changes are combined with observations of groundwater depletion, reservoir storage, and dynamic ice-sheet mass changes. The resulting total geocentric regional sea-level change is then compared to independent measurements from satellite altimeter observations. The detectability of the climate-forced signal is assessed by comparing the model ensemble mean of the "historical" simulations with the characteristics of sea-level variability in pre-industrial control simulations. To further minimize the impact of internal variability, zonal averages were produced. We find that, in all ocean basins, zonally averaged simulated sea-level changes are consistent with observations within sampling uncertainties associated with simulated internal variability of the sterodynamic component. Furthermore, the simulated zonally averaged sea-level change cannot be explained by internal variability alone - thus we conclude that the observations include a forced contribution that is detectable at basin scales.
Research center :
Sphères - SPHERES
Disciplines :
Earth sciences & physical geography
Author, co-author :
Richter, K.
Meyssignac, B.
Slangen, A.
Melet, A.
Church, J.
Fettweis, Xavier  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Marzeion, B.
Agosta, Cécile 
Ligtenberg, S.
Spada, G.
Palmer, M.
Roberts, C.
Champollion, N.
More authors (3 more) Less
Language :
English
Title :
Detecting a forced signal in satellite-era sea-level change
Publication date :
01 June 2020
Journal title :
Environmental Research Letters
eISSN :
1748-9326
Publisher :
Institute of Physics Publishing, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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since 09 June 2020

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