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An Integrated View of Greenland Ice Sheet Mass Changes Based on Models and Satellite Observations

1
Danish Meteorological Institute, Lyngbyvej 100, 2200 Copenhagen, Denmark
2
National Space Institute, DTU Space, Geodynamics Department, 2800 Kongens Lyngby, Denmark
3
ENVEO IT GmbH, 6020 Innsbruck, Austria
4
Institut für Planetare Geodäsie, Technische Universität Dresden, 01062 Dresden, Germany
5
Department of Geoscience and Remote Sensing, Delft University of Technology, 2600 AA Delft, The Netherlands
6
The Department of Glaciology and Climate, The Geological Survey of Denmark and Greenland (GEUS), 1350 Copenhagen, Denmark
7
Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
8
Sandholt ApS, 1953 Frederiksberg, Denmark
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(12), 1407; https://doi.org/10.3390/rs11121407
Received: 18 March 2019 / Revised: 14 May 2019 / Accepted: 25 May 2019 / Published: 13 June 2019
(This article belongs to the Special Issue Remote Sensing of Ice Sheets)
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PDF [28982 KB, uploaded 13 June 2019]
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Abstract

The Greenland ice sheet is a major contributor to sea level rise, adding on average 0.47 ± 0.23 mm year 1 to global mean sea level between 1991 and 2015. The cryosphere as a whole has contributed around 45% of observed global sea level rise since 1993. Understanding the present-day state of the Greenland ice sheet is therefore vital for understanding the processes controlling the modern-day rates of sea level change and for making projections of sea level rise into the future. Here, we provide an overview of the current state of the mass budget of Greenland based on a diverse range of remote sensing observations to produce the essential climate variables (ECVs) of ice velocity, surface elevation change, grounding line location, calving front location, and gravimetric mass balance as well as numerical modelling that together build a consistent picture of a shrinking ice sheet. We also combine these observations with output from a regional climate model and from an ice sheet model to gain insight into existing biases in ice sheet dynamics and surface mass balance processes. Observations show surface lowering across virtually all regions of the ice sheet and at some locations up to −2.65 m year 1 between 1995 and 2017 based on radar altimetry analysis. In addition, calving fronts at 28 study sites, representing a sample of typical glaciers, have retreated all around Greenland since the 1990s and in only two out of 28 study locations have they remained stable. During the same period, two of five floating ice shelves have collapsed while the locations of grounding lines at the remaining three floating ice shelves have remained stable over the observation period. In a detailed case study with a fracture model at Petermann glacier, we demonstrate the potential sensitivity of these floating ice shelves to future warming. GRACE gravimetrically-derived mass balance (GMB) data shows that overall Greenland has lost 255 ± 15 Gt year 1 of ice over the period 2003 to 2016, consistent with that shown by IMBIE and a marked increase compared to a rate of loss of 83 ± 63 Gt year 1 in the 1993–2003 period. Regional climate model and ice sheet model simulations show that surface mass processes dominate the Greenland ice sheet mass budget over most of the interior. However, in areas of high ice velocity there is a significant contribution to mass loss by ice dynamical processes. Marked differences between models and observations indicate that not all processes are captured accurately within models, indicating areas for future research. View Full-Text
Keywords: Climate Change Initiative (CCI); Greenland ice sheet; mass budget; cryosphere; sea level rise; altimetry; mass balance; ice sheet modelling Climate Change Initiative (CCI); Greenland ice sheet; mass budget; cryosphere; sea level rise; altimetry; mass balance; ice sheet modelling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mottram, R.; B. Simonsen, S.; Høyer Svendsen, S.; Barletta, V.R.; Sandberg Sørensen, L.; Nagler, T.; Wuite, J.; Groh, A.; Horwath, M.; Rosier, J.; Solgaard, A.; Hvidberg, C.S.; Forsberg, R. An Integrated View of Greenland Ice Sheet Mass Changes Based on Models and Satellite Observations. Remote Sens. 2019, 11, 1407.

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