Recent changes in the flow of the Ross Ice Shelf, West Antarctica
Comparison of surface velocities measured during the Ross Ice Shelf Geophysical and Glaciological Survey (RIGGS, 1973 to 1978) and velocities measured via feature tracking between two Moderate-resolution Imaging Spectroradiometer (MODIS) mosaics (compiled from 2003/4 and 2008/9 images) reveals wides...
Published in: | Earth and Planetary Science Letters |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/10523/4553 https://doi.org/10.1016/j.epsl.2013.06.013 |
id |
ftunivotagoour:oai:ourarchive.otago.ac.nz:10523/4553 |
---|---|
record_format |
openpolar |
spelling |
ftunivotagoour:oai:ourarchive.otago.ac.nz:10523/4553 2023-05-15T13:52:08+02:00 Recent changes in the flow of the Ross Ice Shelf, West Antarctica Hulbe, Christina L. Scamobs, Ted A. Lee, Choon-Ki Bohlander, Jennifer Harran, Terry 2014-01-08T22:51:44Z application/pdf http://hdl.handle.net/10523/4553 https://doi.org/10.1016/j.epsl.2013.06.013 en eng Elsevier Earth and Planetary Science Letters http://www.sciencedirect.com/science/article/pii/S0012821X13003294 http://hdl.handle.net/10523/4553 doi:10.1016/j.epsl.2013.06.013 Copyright © 2013 Elsevier B.V. All rights reserved West Antarctica Ross Ice Shelf glacier change remote sensing modeling Journal Article 2014 ftunivotagoour https://doi.org/10.1016/j.epsl.2013.06.013 2022-05-11T19:16:44Z Comparison of surface velocities measured during the Ross Ice Shelf Geophysical and Glaciological Survey (RIGGS, 1973 to 1978) and velocities measured via feature tracking between two Moderate-resolution Imaging Spectroradiometer (MODIS) mosaics (compiled from 2003/4 and 2008/9 images) reveals widespread slowing and minor areas of acceleration in the Ross Ice Shelf (RIS) over the approximately 30 year interval. The largest changes (−13 ma−2) occur near the Whillans and Mercer Ice Streams grounding line in the southernmost part of the ice shelf. Speed has increased over the interval (up to 5 ma−2) between the MacAyeal Ice Stream grounding line and the shelf front, and along the eastern shelf front. Changes in ice thickness computed using ICESat laser altimetry are used together with a well-tested model of the ice shelf to investigate underlying causes of change in the flow of the ice shelf over time. The observed transients represent a combination of recent forcings and ongoing response to ice stream discharge variations over the past millennium. While evidence of older events may be present, the modern signal is dominated by shorter time scale events, including the stagnation of Kamb Ice Stream about 160 years ago, recent changes in basal drag on the Whillans Ice Stream ice plain and, perhaps, iceberg calving. Details in embayment geometry, for example the shallow sea floor below Crary Ice Rise, modulate the spatial pattern of ice shelf response to boundary condition perturbations. Peer Reviewed Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Kamb Ice Stream MacAyeal Ice Stream Ross Ice Shelf West Antarctica Whillans Ice Stream University of Otago: Research Archive (OUR Archive) Crary Ice Rise ENVELOPE(-172.500,-172.500,-82.933,-82.933) Kamb Ice Stream ENVELOPE(-145.000,-145.000,-82.250,-82.250) MacAyeal Ice Stream ENVELOPE(-143.000,-143.000,-80.000,-80.000) Mercer ENVELOPE(65.647,65.647,-70.227,-70.227) Ross Ice Shelf West Antarctica Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Whillans Ice Stream ENVELOPE(-145.000,-145.000,-83.667,-83.667) Earth and Planetary Science Letters 376 54 62 |
institution |
Open Polar |
collection |
University of Otago: Research Archive (OUR Archive) |
op_collection_id |
ftunivotagoour |
language |
English |
topic |
West Antarctica Ross Ice Shelf glacier change remote sensing modeling |
spellingShingle |
West Antarctica Ross Ice Shelf glacier change remote sensing modeling Hulbe, Christina L. Scamobs, Ted A. Lee, Choon-Ki Bohlander, Jennifer Harran, Terry Recent changes in the flow of the Ross Ice Shelf, West Antarctica |
topic_facet |
West Antarctica Ross Ice Shelf glacier change remote sensing modeling |
description |
Comparison of surface velocities measured during the Ross Ice Shelf Geophysical and Glaciological Survey (RIGGS, 1973 to 1978) and velocities measured via feature tracking between two Moderate-resolution Imaging Spectroradiometer (MODIS) mosaics (compiled from 2003/4 and 2008/9 images) reveals widespread slowing and minor areas of acceleration in the Ross Ice Shelf (RIS) over the approximately 30 year interval. The largest changes (−13 ma−2) occur near the Whillans and Mercer Ice Streams grounding line in the southernmost part of the ice shelf. Speed has increased over the interval (up to 5 ma−2) between the MacAyeal Ice Stream grounding line and the shelf front, and along the eastern shelf front. Changes in ice thickness computed using ICESat laser altimetry are used together with a well-tested model of the ice shelf to investigate underlying causes of change in the flow of the ice shelf over time. The observed transients represent a combination of recent forcings and ongoing response to ice stream discharge variations over the past millennium. While evidence of older events may be present, the modern signal is dominated by shorter time scale events, including the stagnation of Kamb Ice Stream about 160 years ago, recent changes in basal drag on the Whillans Ice Stream ice plain and, perhaps, iceberg calving. Details in embayment geometry, for example the shallow sea floor below Crary Ice Rise, modulate the spatial pattern of ice shelf response to boundary condition perturbations. Peer Reviewed |
format |
Article in Journal/Newspaper |
author |
Hulbe, Christina L. Scamobs, Ted A. Lee, Choon-Ki Bohlander, Jennifer Harran, Terry |
author_facet |
Hulbe, Christina L. Scamobs, Ted A. Lee, Choon-Ki Bohlander, Jennifer Harran, Terry |
author_sort |
Hulbe, Christina L. |
title |
Recent changes in the flow of the Ross Ice Shelf, West Antarctica |
title_short |
Recent changes in the flow of the Ross Ice Shelf, West Antarctica |
title_full |
Recent changes in the flow of the Ross Ice Shelf, West Antarctica |
title_fullStr |
Recent changes in the flow of the Ross Ice Shelf, West Antarctica |
title_full_unstemmed |
Recent changes in the flow of the Ross Ice Shelf, West Antarctica |
title_sort |
recent changes in the flow of the ross ice shelf, west antarctica |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://hdl.handle.net/10523/4553 https://doi.org/10.1016/j.epsl.2013.06.013 |
long_lat |
ENVELOPE(-172.500,-172.500,-82.933,-82.933) ENVELOPE(-145.000,-145.000,-82.250,-82.250) ENVELOPE(-143.000,-143.000,-80.000,-80.000) ENVELOPE(65.647,65.647,-70.227,-70.227) ENVELOPE(-64.250,-64.250,-84.450,-84.450) ENVELOPE(-145.000,-145.000,-83.667,-83.667) |
geographic |
Crary Ice Rise Kamb Ice Stream MacAyeal Ice Stream Mercer Ross Ice Shelf West Antarctica Whillans Whillans Ice Stream |
geographic_facet |
Crary Ice Rise Kamb Ice Stream MacAyeal Ice Stream Mercer Ross Ice Shelf West Antarctica Whillans Whillans Ice Stream |
genre |
Antarc* Antarctica Ice Shelf Kamb Ice Stream MacAyeal Ice Stream Ross Ice Shelf West Antarctica Whillans Ice Stream |
genre_facet |
Antarc* Antarctica Ice Shelf Kamb Ice Stream MacAyeal Ice Stream Ross Ice Shelf West Antarctica Whillans Ice Stream |
op_relation |
Earth and Planetary Science Letters http://www.sciencedirect.com/science/article/pii/S0012821X13003294 http://hdl.handle.net/10523/4553 doi:10.1016/j.epsl.2013.06.013 |
op_rights |
Copyright © 2013 Elsevier B.V. All rights reserved |
op_doi |
https://doi.org/10.1016/j.epsl.2013.06.013 |
container_title |
Earth and Planetary Science Letters |
container_volume |
376 |
container_start_page |
54 |
op_container_end_page |
62 |
_version_ |
1766256380660940800 |