Global sea-level budget 1993 - present

WCRP Global Sea Level Budget Group, Anny Cazenave*, Benoit Meyssignac, Michael Ablain, Magdalena Balmaseda, Jonathan Bamber, Valentina Roberta Barletta, Brian Beckley, Jérôme Benveniste, Etienne Berthier, Alejandro Blazquez, Tim Boyer , Denise Caceres , Don P. Chambers, Nicolas Champollion, Ben Chao , Jianli Chen , Lijing Cheng , John A. Church , Stephen ChuterJ. Graham Cogley , Soenke Dangendorf , Damien Desbruyères , Petra Döll , Catia Domingues, Ulrike Falk , James Famiglietti , Luciana Fenoglio-Marc, René Forsberg, Gaia Galassi , Alex Gardner, Andreas Groh, Benjamin Hamlington , Anna Hogg, Martin Horwath, Vincent Humphrey , Laurent Husson , Masayoshi Ishii , Adrian Jaeggi , Svetlana Jevrejeva , Gregory Johnson , Nicolas Kolodziejczyk , Jürgen Kusche , Kurt Lambeck , Felix Landerer , Paul Leclercq , Benoit Legresy , Eric Leuliette , William Llovel, Laurent Longuevergne , Bryant D. Loomis , Scott B Luthcke, Marta Marcos, Ben Marzeion , Chris Merchant , Mark Merrifield , Glenn Milne, Gary Mitchum , Yara Mohajerani, Maeva Monier , Didier Monselesan , Steve Nerem , Hindumathi Palanisamy , Frank Paul, Begona Pérez, Christopher G. Piecuch , Rui M. Ponte , Sarah G. Purkey , John T. Reager , Roelof Rietbroek , Eric Rignot, Riccardo Riva, Dean H. Roemmich , Louise Sandberg Sørensen, Ingo Sasgen, E.J.O. Schram, Sonia I. Seneviratne , C.K. Shum, Giorgio Spada, Detlef Stammer, Roderic van de Wal , Isabella Velicogna, Karina von Schuckmann, Yoshihide Wada, Yiguo Wang , Christopher S. Watson, David Wiese, Susan Wijffels , Richard Westaway , Guy Woppelmann, Bert Wouters

*Corresponding author for this work

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Abstract

Global mean sea level is an integral of changes occurring in the climate system in response to unforced climate variability as well as natural and anthropogenic forcing factors. Its temporal evolution allows changes (e.g., acceleration) to be detected in one or more components. Study of the sea-level budget provides constraints on missing or poorly known contributions, such as the unsurveyed deep ocean or the still uncertain land water component. In the context of the World Climate Research Programme Grand Challenge entitled "Regional Sea Level and Coastal Impacts", an international effort involving the sea-level community worldwide has been recently initiated with the objective of assessing the various datasets used to estimate components of the sea-level budget during the altimetry era (1993 to present). These datasets are based on the combination of a broad range of space-based and in situ observations, model estimates, and algorithms. Evaluating their quality, quantifying uncertainties and identifying sources of discrepancies between component estimates is extremely useful for various applications in climate research. This effort involves several tens of scientists from about 50 research teams/institutions worldwide (www.wcrp-climate.org/grand-challenges/gc-sea-level, last access: 22 August 2018). The results presented in this paper are a synthesis of the first assessment performed during 2017–2018. We present estimates of the altimetry-based global mean sea level (average rate of 3.1±0.3mmyr−1 and acceleration of 0.1mmyr−2 over 1993–present), as well as of the different components of the sea-level budget (http://doi.org/10.17882/54854, last access: 22 August 2018). We further examine closure of the sea-level budget, comparing the observed global mean sea level with the sum of components. Ocean thermal expansion, glaciers, Greenland and Antarctica contribute 42%, 21%, 15% and 8% to the global mean sea level over the 1993–present period. We also study the sea-level budget over 2005–present, using GRACE-based ocean mass estimates instead of the sum of individual mass components. Our results demonstrate that the global mean sea level can be closed to within 0.3mmyr−1 (1σ). Substantial uncertainty remains for the land water storage component, as shown when examining individual mass contributions to sea level.
Original languageEnglish
JournalEarth System Science Data
Volume10
Issue number3
Pages (from-to)1551-1590
ISSN1866-3508
DOIs
Publication statusPublished - 2018

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© Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.

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