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  • 1
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    Bathymetry data reveal glaciers vulnerable to ice-ocean interaction in Uummannaq and Vaigat glacial fjords, west Greenland (2016)
    AGU (American Geophysical Union) | Wiley
    In:  Geophysical Research Letters, 43 (6). pp. 2667-2674.
    Details
    Publication Date: 2019-02-01
    Description: Marine-terminating glaciers play a critical role in controlling Greenland's ice sheet mass balance. Their frontal margins interact vigorously with the ocean, but our understanding of this interaction is limited, in part, by a lack of bathymetry data. Here we present a multibeam echo sounding survey of 14 glacial fjords in the Uummannaq and Vaigat fjords, west Greenland, which extends from the continental shelf to the glacier fronts. The data reveal valleys with shallow sills, overdeepenings (〉 1300 m) from glacial erosion, and seafloor depths 100-1000 m deeper than in existing charts. Where fjords are deep enough, we detect the pervasive presence of warm, salty Atlantic Water (AW) (〉 2.5 degrees C) with high melt potential, but we also find numerous glaciers grounded on shallow (〈 200 m) sills, standing in cold (〈 1 degrees C) waters in otherwise deep fjords, i.e., with reduced melt potential. Bathymetric observations extending to the glacier fronts are critical to understand the glacier evolution.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2016GL067832
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Increasing rates of ice mass loss from the Greenland and Antarctic ice sheets revealed by GRACE (2009)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 36 (19). L19503.
    Details
    Publication Date: 2020-01-10
    Description: We use monthly measurements of time‐variable gravity from the GRACE (Gravity Recovery and Climate Experiment) satellite gravity mission to determine the ice mass‐loss for the Greenland and Antarctic Ice Sheets during the period between April 2002 and February 2009. We find that during this time period the mass loss of the ice sheets is not a constant, but accelerating with time, i.e., that the GRACE observations are better represented by a quadratic trend than by a linear one, implying that the ice sheets contribution to sea level becomes larger with time. In Greenland, the mass loss increased from 137 Gt/yr in 2002–2003 to 286 Gt/yr in 2007–2009, i.e., an acceleration of −30 ± 11 Gt/yr2 in 2002–2009. In Antarctica the mass loss increased from 104 Gt/yr in 2002–2006 to 246 Gt/yr in 2006–2009, i.e., an acceleration of −26 ± 14 Gt/yr2 in 2002–2009. The observed acceleration in ice sheet mass loss helps reconcile GRACE ice mass estimates obtained for different time periods.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2009GL040222
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Partitioning Recent Greenland Mass Loss (2009)
    American Association for the Advancement of Science
    In:  Science, 326 (5955). pp. 984-986.
    Details
    Publication Date: 2020-05-28
    Description: Mass budget calculations, validated with satellite gravity observations [from the Gravity Recovery and Climate Experiment (GRACE) satellites], enable us to quantify the individual components of recent Greenland mass loss. The total 2000–2008 mass loss of ~1500 gigatons, equivalent to 0.46 millimeters per year of global sea level rise, is equally split between surface processes (runoff and precipitation) and ice dynamics. Without the moderating effects of increased snowfall and refreezing, post-1996 Greenland ice sheet mass losses would have been 100% higher. Since 2006, high summer melt rates have increased Greenland ice sheet mass loss to 273 gigatons per year (0.75 millimeters per year of equivalent sea level rise). The seasonal cycle in surface mass balance fully accounts for detrended GRACE mass variations, confirming insignificant subannual variation in ice sheet discharge.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1126/science.1178176
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Ice mass variation in Greenland and Antarctica from GRACE (2005)
    In:  EPIC3European Geosciences Union Second General Assembly, Wien (Austria), 25-29 April 2005, Geophysical Research Abstracts, vol. 7CD-ROM)., 10017
    Details
    Publication Date: 2019-07-17
    Description: The GRACE satellite mission, launched in March of 2002, provides monthly measurementsof time variable gravity at scales of a few hundred kilometers and larger. Thesedata can be used to estimate temporal variations in the distribution of surface mass.Weexamine here the 22 monthly GRACE gravity field solutions that are currently availablefor analyses. We find that these fields can be used to recover mass imbalance andnet snow accumulation for the Greenland and Antarctic ice sheets. GRACE estimatesof Greenland mass change agree with ice mass imbalance estimates from altimeterheights within measurement errors. We also estimate net snow accumulation from thenonsecular component of the GRACE signal.We compared nonsecular variation fromGRACE with ERA40-derived estimates and we interpreted the differences.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
  • 5
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    Snow Accumulation, Ice Discharge and Mass Balance in Greenland and Antarctica from GRACE (2004)
    In:  EPIC3AGU Fall Meeting, San Francisco (USA), 13-17 December 2004, Eos Transactions AGU, 85(47), Fall Meet. Suppl., Abstract C32A-05.
    Details
    Publication Date: 2019-07-17
    Description: The GRACE satellite mission, launched in March of 2002, provides monthly measurements of time variable gravity at scales of a few hundred kilometers and larger. These data can be used to estimate temporal variations in the distribution of surface mass. We examine here the nineteen monthly GRACE gravity field solutions that are currently available for analyses. We find that these fields can be used to recover mass imbalance and net snow accumulation for the Greenland and Antarctic ice sheets. GRACE estimates of Greenland mass change agree with ice mass imbalance estimates from altimeter heights within measurement errors. We also estimate net snow accumulation from the nonsecular component of the GRACE signal. If precipitation minus evapo-transpiration (P-E) and runoff (R) are known it is possible to obtain monthly estimates of ice discharge through the grounding line from GRACE. We estimate ice discharge for the Greenland ice sheet by combining GRACE estimates of nonsecular net snow accumulation with ERA40-derived P-E-R.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 6
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    Short term mass variability in Greenland, from GRACE (2005)
    In:  EPIC3Geophysical Research Letters, 32, L05501
    Details
    Publication Date: 2019-07-17
    Description: We use twenty-two monthly GRACE (GravityRecovery and Climate Experiment) gravity fields to recover nonsecular mass change in Greenland. The results show large seasonal variability. We compare withmodeled precipitation, evaporation, and runoff derived from ERA40 (the 40-year ECMWF Re-Analysis of the global atmosphere). The models seasonal amplitude is controlled by runoff and agrees reasonably well with GRACE. Both GRACE and the model show an April/Maymaximum. But the GRACE results show a delayed minimum relative to the model. This difference is probably associated with omissions in the runoff model, ice discharge, subglacial hydrology, mass loss by blowing snow, and hydrology in ice-free regions. The discrepancy is smaller, but still significant, for south Greenland alone. When we include a proxy for ice discharge the agreementis improved.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 7
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    Time-variable gravity observations of ice sheet mass balance: Precision and limitations of the GRACE satellite data (2013)
    In:  Geophysical Research Letters
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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  • 8
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    Spread of ice mass loss into northwest Greenland observed by GRACE and GPS (2010)
    In:  Geophysical Research Letters
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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  • 9
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    Satellite-based estimates of groundwater depletion in India (2009)
    In:  Nature
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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  • 10
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    Accuracy of GRACE mass estimates (2006)
    In:  Geophysical Research Letters
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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