Pine Island glacier ice shelf melt distributed at kilometre scales
By thinning and accelerating, West Antarctic ice streams are contributing about 10% of the observed global sea level rise. Much of this ice loss is from Pine Island Glacier, which has thinned since at least 1992, driven by changes in ocean heat transport beneath its ice shelf and retreat of the grou...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-7-1543-2013 https://tc.copernicus.org/articles/7/1543/2013/ |
id |
ftcopernicus:oai:publications.copernicus.org:tc19867 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tc19867 2023-05-15T13:54:27+02:00 Pine Island glacier ice shelf melt distributed at kilometre scales Dutrieux, P. Vaughan, D. G. Corr, H. F. J. Jenkins, A. Holland, P. R. Joughin, I. Fleming, A. H. 2018-09-27 application/pdf https://doi.org/10.5194/tc-7-1543-2013 https://tc.copernicus.org/articles/7/1543/2013/ eng eng doi:10.5194/tc-7-1543-2013 https://tc.copernicus.org/articles/7/1543/2013/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-7-1543-2013 2020-07-20T16:25:21Z By thinning and accelerating, West Antarctic ice streams are contributing about 10% of the observed global sea level rise. Much of this ice loss is from Pine Island Glacier, which has thinned since at least 1992, driven by changes in ocean heat transport beneath its ice shelf and retreat of the grounding line. Details of the processes driving this change, however, remain largely elusive, hampering our ability to predict the future behaviour of this and similar systems. Here, a Lagrangian methodology is developed to measure oceanic melting of such rapidly advecting ice. High-resolution satellite and airborne observations of ice surface velocity and elevation are used to quantify patterns of basal melt under the Pine Island Glacier ice shelf and the associated adjustments to ice flow. At the broad scale, melt rates of up to 100 m yr −1 occur near the grounding line, reducing to 30 m yr −1 just 20 km downstream. Between 2008 and 2011, basal melting was largely compensated by ice advection, allowing us to estimate an average loss of ice to the ocean of 87 km 3 yr −1 , in close agreement with 2009 oceanographically constrained estimates. At smaller scales, a network of basal channels typically 500 m to 3 km wide is sculpted by concentrated melt, with kilometre-scale anomalies reaching 50% of the broad-scale basal melt. Basal melting enlarges the channels close to the grounding line, but farther downstream melting tends to diminish them. Kilometre-scale variations in melt are a key component of the complex ice–ocean interaction beneath the ice shelf, implying that greater understanding of their effect, or very high resolution models, are required to predict the sea-level contribution of the region. Text Antarc* Antarctic Ice Shelf Pine Island Glacier Copernicus Publications: E-Journals Antarctic Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) The Cryosphere 7 5 1543 1555 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
By thinning and accelerating, West Antarctic ice streams are contributing about 10% of the observed global sea level rise. Much of this ice loss is from Pine Island Glacier, which has thinned since at least 1992, driven by changes in ocean heat transport beneath its ice shelf and retreat of the grounding line. Details of the processes driving this change, however, remain largely elusive, hampering our ability to predict the future behaviour of this and similar systems. Here, a Lagrangian methodology is developed to measure oceanic melting of such rapidly advecting ice. High-resolution satellite and airborne observations of ice surface velocity and elevation are used to quantify patterns of basal melt under the Pine Island Glacier ice shelf and the associated adjustments to ice flow. At the broad scale, melt rates of up to 100 m yr −1 occur near the grounding line, reducing to 30 m yr −1 just 20 km downstream. Between 2008 and 2011, basal melting was largely compensated by ice advection, allowing us to estimate an average loss of ice to the ocean of 87 km 3 yr −1 , in close agreement with 2009 oceanographically constrained estimates. At smaller scales, a network of basal channels typically 500 m to 3 km wide is sculpted by concentrated melt, with kilometre-scale anomalies reaching 50% of the broad-scale basal melt. Basal melting enlarges the channels close to the grounding line, but farther downstream melting tends to diminish them. Kilometre-scale variations in melt are a key component of the complex ice–ocean interaction beneath the ice shelf, implying that greater understanding of their effect, or very high resolution models, are required to predict the sea-level contribution of the region. |
format |
Text |
author |
Dutrieux, P. Vaughan, D. G. Corr, H. F. J. Jenkins, A. Holland, P. R. Joughin, I. Fleming, A. H. |
spellingShingle |
Dutrieux, P. Vaughan, D. G. Corr, H. F. J. Jenkins, A. Holland, P. R. Joughin, I. Fleming, A. H. Pine Island glacier ice shelf melt distributed at kilometre scales |
author_facet |
Dutrieux, P. Vaughan, D. G. Corr, H. F. J. Jenkins, A. Holland, P. R. Joughin, I. Fleming, A. H. |
author_sort |
Dutrieux, P. |
title |
Pine Island glacier ice shelf melt distributed at kilometre scales |
title_short |
Pine Island glacier ice shelf melt distributed at kilometre scales |
title_full |
Pine Island glacier ice shelf melt distributed at kilometre scales |
title_fullStr |
Pine Island glacier ice shelf melt distributed at kilometre scales |
title_full_unstemmed |
Pine Island glacier ice shelf melt distributed at kilometre scales |
title_sort |
pine island glacier ice shelf melt distributed at kilometre scales |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-7-1543-2013 https://tc.copernicus.org/articles/7/1543/2013/ |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Antarctic Pine Island Glacier |
geographic_facet |
Antarctic Pine Island Glacier |
genre |
Antarc* Antarctic Ice Shelf Pine Island Glacier |
genre_facet |
Antarc* Antarctic Ice Shelf Pine Island Glacier |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-7-1543-2013 https://tc.copernicus.org/articles/7/1543/2013/ |
op_doi |
https://doi.org/10.5194/tc-7-1543-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
5 |
container_start_page |
1543 |
op_container_end_page |
1555 |
_version_ |
1766260373854355456 |