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Mass balance of the Greenland and Antarctic ice sheets from 1992 to 2020

Otosaka, IN and Shepherd, A and Ivins, ER and Schlegel, N-J and Amory, C and Van Den Broeke, MR and Horwath, M and Joughin, I and King, MD and Krinner, G and Nowicki, S and Payne, AJ and Rignot, E and Scambos, T and Simon, KM and Smith, BE and Sørensen, LS and Velicogna, I and Whitehouse, PL and Geruo, A and Agosta, C and Ahlstrøm, AP and Blazquez, A and Colgan, W and Engdahl, ME and Fettweis, X and Forsberg, R and Gallée, H and Gardner, A and Gilbert, L and Gourmelen, N and Groh, A and Gunter, BC and Harig, C and Helm, V and Khan, SA and Kittel, C and Konrad, H and Langen, PL and Lecavalier, BS and Liang, C-C and Loomis, BD and McMillan, M and Melini, D and Mernild, SH and Mottram, R and Mouginot, J and Nilsson, J and Noël, B and Pattle, ME and Peltier, WR and Pie, N and Roca, M and Sasgen, I and Save, HV and Seo, K-W and Scheuchl, B and Schrama, EJO and Schröder, L and Simonsen, SB and Slater, T and Spada, G and Sutterley, TC and Vishwakarma, BD and Van Wessem, JM and Wiese, D and Van Der Wal, W and Wouters, B (2023) Mass balance of the Greenland and Antarctic ice sheets from 1992 to 2020. In: Earth System Science Data, 15 (4). pp. 1597-1616.

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Official URL: https://doi.org/10.5194/essd-15-1597-2023


Ice losses from the Greenland and Antarctic ice sheets have accelerated since the 1990s, accounting for a significant increase in the global mean sea level. Here, we present a new 29-year record of ice sheet mass balance from 1992 to 2020 from the Ice Sheet Mass Balance Inter-comparison Exercise (IMBIE). We compare and combine 50 independent estimates of ice sheet mass balance derived from satellite observations of temporal changes in ice sheet flow, in ice sheet volume, and in Earth's gravity field. Between 1992 and 2020, the ice sheets contributed 21.0±1.9g€¯mm to global mean sea level, with the rate of mass loss rising from 105g€¯Gtg€¯yr-1 between 1992 and 1996 to 372g€¯Gtg€¯yr-1 between 2016 and 2020. In Greenland, the rate of mass loss is 169±9g€¯Gtg€¯yr-1 between 1992 and 2020, but there are large inter-annual variations in mass balance, with mass loss ranging from 86g€¯Gtg€¯yr-1 in 2017 to 444g€¯Gtg€¯yr-1 in 2019 due to large variability in surface mass balance. In Antarctica, ice losses continue to be dominated by mass loss from West Antarctica (82±9g€¯Gtg€¯yr-1) and, to a lesser extent, from the Antarctic Peninsula (13±5g€¯Gtg€¯yr-1). East Antarctica remains close to a state of balance, with a small gain of 3±15g€¯Gtg€¯yr-1, but is the most uncertain component of Antarctica's mass balance.

Item Type: Journal Article
Publication: Earth System Science Data
Publisher: Copernicus Publications
Additional Information: The copyright for this article belongs to the Authors.
Department/Centre: Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research
Date Deposited: 15 Jun 2023 07:58
Last Modified: 15 Jun 2023 07:58
URI: https://eprints.iisc.ac.in/id/eprint/81954

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