Resolving Seasonal Ice Velocity of 45 Greenlandic Glaciers With Very High Temporal Details

Vijay, Saurabh; Khan, Shfaqat Abbas; Kusk, Anders; Solgaard, Anne; Moon, Twila; Bjørk, Anders A.

doi:10.1029/2018gl081503

Cited by 64 publications

(181 citation statements)

References 42 publications

(134 reference statements)

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“…3 to gain improved constraints on estimates of ice sheet discharge over three decades, including the period leading up to the onset of rapid glacier retreat and acceleration. Rates of Greenland glacier retreat have accelerated 6 and previous work has identified relationships between glacier speed and retreat 7 and glacier area 8 for smaller subsets of Greenland glaciers. We also then combine these data with highresolution observations of time-varying calving front position changes and perform a GrIS-wide analysis of how these two variables relate on individual, regional, and ice sheet-wide spatial scales over the multi-decadal record.…”

mentioning

confidence: 92%

Dynamic ice loss from the Greenland Ice Sheet driven by sustained glacier retreat

King

Howat

Candela

et al. 2020

Commun Earth Environ

254

201

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The Greenland Ice Sheet is losing mass at accelerated rates in the 21st century, making it the largest single contributor to rising sea levels. Faster flow of outlet glaciers has substantially contributed to this loss, with the cause of speedup, and potential for future change, uncertain. Here we combine more than three decades of remotely sensed observational products of outlet glacier velocity, elevation, and front position changes over the full ice sheet. We compare decadal variability in discharge and calving front position and find that increased glacier discharge was due almost entirely to the retreat of glacier fronts, rather than inland ice sheet processes, with a remarkably consistent speedup of 4-5% per km of retreat across the ice sheet. We show that widespread retreat between 2000 and 2005 resulted in a stepincrease in discharge and a switch to a new dynamic state of sustained mass loss that would persist even under a decline in surface melt.

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mentioning

confidence: 92%

Dynamic ice loss from the Greenland Ice Sheet driven by sustained glacier retreat

King

Howat

Candela

et al. 2020

Commun Earth Environ

254

201

View full text Add to dashboard Cite

show abstract

“…Ice velocity data are available with increasing spatial and temporal resolution (e.g., Vijay et al, 2019). Until recently, ice velocity mosaics were limited to once per year during winter (Joughin et al, 2010), and they are still temporally limited, often to annual resolution, prior to 2000 (e.g., Mouginot et al, 2018b, c).…”

Section: Input Datamentioning

confidence: 99%

“…The product thus has a total time span of 24 d. Twelveday pairs are also included in each mosaic from track 90, 112, and 142 covering the ice sheet margin in the south as well as other tracks on an irregular basis in order to increase the spatial resolution. Rathmann et al 2017and Vijay et al (2019) have exploited the high temporal resolution of the product to investigate dynamics of glaciers. The maps are available from 13 September 2016 and onward, are updated regularly, and are available from http://promice.org (last access: 6 June 2020).…”

Section: Appendix C: Sentinel-1 Ice Velocity Mapsmentioning

confidence: 99%

Greenland Ice Sheet solid ice discharge from 1986 through March 2020

Mankoff

Solgaard

Colgan

et al. 2020

Earth Syst. Sci. Data

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Abstract. We present a 1986 through March 2020 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 handpicked 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 12 d updates to velocity. The 2010 through 2019 average ice discharge through the flux gates is ∼487±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 northwest region through 2017 and in the southeast from 2017 through March 2020. As part of the journal's living archive option and our goal to make an operational product, all input data, code, and results from this study will be updated as needed (when new input data are available, as new features are added, or to fix bugs) and made available at https://doi.org/10.22008/promice/data/ice_discharge (Mankoff, 2020a) and at https://github.com/mankoff/ice_discharge (last access: 6 June 2020, Mankoff, 2020e).

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“…The product thus has a total time span of 24 d. Six-day pairs are also included in each mosaic from tracks 90, 112 and 142 covering the ice-sheet margin in the south as well as other tracks on an irregular basis in order to increase the spatial resolution. Rathmann et al 2017and Vijay et al (2019) have exploited the high temporal resolution of the product to investigate dynamics of glaciers. The maps are available from 13 September 2016 and onward, are updated regularly, and are freely available from http://www.promice.org.…”

Section: Appendix C: Sentinel-1 Ice Velocity Mapsmentioning

confidence: 99%

Greenland Ice Sheet solid ice discharge from 1986 through 2017

Mankoff

Colgan

Solgaard

et al. 2019

Earth Syst. Sci. Data

Self Cite

View full text Add to dashboard Cite

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.

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Resolving Seasonal Ice Velocity of 45 Greenlandic Glaciers With Very High Temporal Details

Cited by 64 publications

References 42 publications

Dynamic ice loss from the Greenland Ice Sheet driven by sustained glacier retreat

Dynamic ice loss from the Greenland Ice Sheet driven by sustained glacier retreat

Greenland Ice Sheet solid ice discharge from 1986 through March 2020

Greenland Ice Sheet solid ice discharge from 1986 through 2017

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