Greenland Ice Sheet solid ice discharge from 1986 through 2017

Kenneth D. Mankoff*, William Colgan, Anne Solgaard, Nanna B. Karlsson, Andreas P. Ahlstrøm, Dirk Van As, Jason E. Box, Shfaqat Abbas Khan, Kristian K. Kjeldsen, Jeremie Mouginot, Robert S. Fausto

*Corresponding author for this work

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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.

Original languageEnglish
JournalEarth System Science Data
Volume11
Issue number2
Pages (from-to)769-786
ISSN1866-3508
DOIs
Publication statusPublished - 2019

Bibliographical note

© Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.

Cite this

Mankoff, K. D., Colgan, W., Solgaard, A., Karlsson, N. B., Ahlstrøm, A. P., Van As, D., ... Fausto, R. S. (2019). Greenland Ice Sheet solid ice discharge from 1986 through 2017. Earth System Science Data, 11(2), 769-786. https://doi.org/10.5194/essd-11-769-2019
Mankoff, Kenneth D. ; Colgan, William ; Solgaard, Anne ; Karlsson, Nanna B. ; Ahlstrøm, Andreas P. ; Van As, Dirk ; Box, Jason E. ; Abbas Khan, Shfaqat ; Kjeldsen, Kristian K. ; Mouginot, Jeremie ; Fausto, Robert S. / Greenland Ice Sheet solid ice discharge from 1986 through 2017. In: Earth System Science Data. 2019 ; Vol. 11, No. 2. pp. 769-786.
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title = "Greenland Ice Sheet solid ice discharge from 1986 through 2017",
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.",
author = "Mankoff, {Kenneth D.} and William Colgan and Anne Solgaard and Karlsson, {Nanna B.} and Ahlstr{\o}m, {Andreas P.} and {Van As}, Dirk and Box, {Jason E.} and {Abbas Khan}, Shfaqat and Kjeldsen, {Kristian K.} and Jeremie Mouginot and Fausto, {Robert S.}",
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Mankoff, KD, Colgan, W, Solgaard, A, Karlsson, NB, Ahlstrøm, AP, Van As, D, Box, JE, Abbas Khan, S, Kjeldsen, KK, Mouginot, J & Fausto, RS 2019, 'Greenland Ice Sheet solid ice discharge from 1986 through 2017', Earth System Science Data, vol. 11, no. 2, pp. 769-786. https://doi.org/10.5194/essd-11-769-2019

Greenland Ice Sheet solid ice discharge from 1986 through 2017. / Mankoff, Kenneth D.; Colgan, William; Solgaard, Anne; Karlsson, Nanna B.; Ahlstrøm, Andreas P.; Van As, Dirk; Box, Jason E.; Abbas Khan, Shfaqat; Kjeldsen, Kristian K.; Mouginot, Jeremie; Fausto, Robert S.

In: Earth System Science Data, Vol. 11, No. 2, 2019, p. 769-786.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Greenland Ice Sheet solid ice discharge from 1986 through 2017

AU - Mankoff, Kenneth D.

AU - Colgan, William

AU - Solgaard, Anne

AU - Karlsson, Nanna B.

AU - Ahlstrøm, Andreas P.

AU - Van As, Dirk

AU - Box, Jason E.

AU - Abbas Khan, Shfaqat

AU - Kjeldsen, Kristian K.

AU - Mouginot, Jeremie

AU - Fausto, Robert S.

N1 - © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

U2 - 10.5194/essd-11-769-2019

DO - 10.5194/essd-11-769-2019

M3 - Journal article

VL - 11

SP - 769

EP - 786

JO - Earth System Science Data

JF - Earth System Science Data

SN - 1866-3508

IS - 2

ER -

Mankoff KD, Colgan W, Solgaard A, Karlsson NB, Ahlstrøm AP, Van As D et al. Greenland Ice Sheet solid ice discharge from 1986 through 2017. Earth System Science Data. 2019;11(2):769-786. https://doi.org/10.5194/essd-11-769-2019