Greenland Ice Sheet solid ice discharge from 1986 through 2017
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Published:2019-06-06
Issue:2
Volume:11
Page:769-786
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ISSN:1866-3516
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Container-title:Earth System Science Data
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language:en
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Short-container-title:Earth Syst. Sci. Data
Author:
Mankoff Kenneth D.ORCID, Colgan WilliamORCID, Solgaard AnneORCID, Karlsson Nanna B.ORCID, Ahlstrøm Andreas P.ORCID, van As DirkORCID, Box Jason E.ORCID, Khan Shfaqat AbbasORCID, Kjeldsen Kristian K.ORCID, Mouginot Jeremie, Fausto Robert S.ORCID
Abstract
Abstract. We present a 1986 through 2017 estimate of Greenland Ice Sheet ice discharge.
Our data include all discharging ice that flows faster than 100 m yr−1
and are generated through an automatic and adaptable method, as opposed to
conventional hand-picked gates. We position gates near the present-year
termini and estimate problematic bed topography (ice thickness) values where
necessary. In addition to using annual time-varying ice thickness, our time
series uses velocity maps that begin with sparse spatial and temporal
coverage and end with near-complete spatial coverage and 6 d updates to
velocity. The 2010 through 2017 average ice discharge through the flux gates
is ∼488±49 Gt yr−1. The 10 % uncertainty stems primarily
from uncertain ice bed location (ice thickness). We attribute the ∼50 Gt yr−1 differences among our results and previous studies to our
use of updated bed topography from BedMachine v3. Discharge is approximately
steady from 1986 to 2000, increases sharply from 2000 to 2005, and then is
approximately steady again. However, regional and glacier variability is more
pronounced, with recent decreases at most major glaciers and in all but one
region offset by increases in the NW (northwestern) region. As part of the
journal's living archive option, all input data, code, and results from this
study will be updated when new input data are accessible and made freely
available at https://doi.org/10.22008/promice/data/ice_discharge.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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