The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future
The Mertz Glacier Tongue (MGT) in East Antarctica has been studied since 1911. Early expeditions produced maps using ground or ship-based observations followed later by vertical and/or oblique aerial photography from aircraft. In the modern era, extensive digital satellite imagery is available which...
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ftunivtasecite:oai:ecite.utas.edu.au:114106 2023-05-15T13:42:40+02:00 The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future Giles, AB 2017 https://doi.org/10.1016/j.rse.2017.01.003 http://ecite.utas.edu.au/114106 en eng Elsevier Science Inc http://dx.doi.org/10.1016/j.rse.2017.01.003 Giles, AB, The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future, Remote Sensing of Environment, 191 pp. 30-37. ISSN 0034-4257 (2017) [Refereed Article] http://ecite.utas.edu.au/114106 Earth Sciences Other earth sciences Other earth sciences not elsewhere classified Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1016/j.rse.2017.01.003 2022-08-30T09:11:43Z The Mertz Glacier Tongue (MGT) in East Antarctica has been studied since 1911. Early expeditions produced maps using ground or ship-based observations followed later by vertical and/or oblique aerial photography from aircraft. In the modern era, extensive digital satellite imagery is available which has also been supplemented by the resurrection and scanning of some historic U.S., now declassified, film-based satellite images. Much of the MGT became detached and drifted away following the collision by the B-9B iceberg in February 2010 and a similar sequence, or extension-detachment cycle, must have occurred some-time after Mawson's 19111914 observations. All the available information on the position, shape or appearance of the MGT has been re-examined in an attempt to comprehensively study its past, present and possible future motion. Feature tracking cross correlation methods have been applied for suitably detailed image pairs to accurately measure the MGT advance velocity. The derived mean rate for 19472010 is 118014my −1 with an accompanying ice-front loss rate of ∼190my −1 . A simple model for the MGT exhibits a ∼73year quasi-periodic cycle of rebirth, growth and demise which will affect the volume of bottom water produced in the nearby polynya. Some evidence for this cyclic oceanographic change has recently been reported from regional sediment data. Somewhat speculatively, the model suggests a date of ∼1937 for the previous MGT break-off and around or before ∼2083 for the next. With the MGT being primed to break-off every ∼73years, the precise date being governed by unpredictable external events such as collisions by large icebergs, such cycles have probably occurred for many thousands of years. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Mertz Glacier eCite UTAS (University of Tasmania) East Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) Mertz Glacier Tongue ENVELOPE(145.500,145.500,-67.167,-67.167) Remote Sensing of Environment 191 30 37 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Other earth sciences Other earth sciences not elsewhere classified |
spellingShingle |
Earth Sciences Other earth sciences Other earth sciences not elsewhere classified Giles, AB The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future |
topic_facet |
Earth Sciences Other earth sciences Other earth sciences not elsewhere classified |
description |
The Mertz Glacier Tongue (MGT) in East Antarctica has been studied since 1911. Early expeditions produced maps using ground or ship-based observations followed later by vertical and/or oblique aerial photography from aircraft. In the modern era, extensive digital satellite imagery is available which has also been supplemented by the resurrection and scanning of some historic U.S., now declassified, film-based satellite images. Much of the MGT became detached and drifted away following the collision by the B-9B iceberg in February 2010 and a similar sequence, or extension-detachment cycle, must have occurred some-time after Mawson's 19111914 observations. All the available information on the position, shape or appearance of the MGT has been re-examined in an attempt to comprehensively study its past, present and possible future motion. Feature tracking cross correlation methods have been applied for suitably detailed image pairs to accurately measure the MGT advance velocity. The derived mean rate for 19472010 is 118014my −1 with an accompanying ice-front loss rate of ∼190my −1 . A simple model for the MGT exhibits a ∼73year quasi-periodic cycle of rebirth, growth and demise which will affect the volume of bottom water produced in the nearby polynya. Some evidence for this cyclic oceanographic change has recently been reported from regional sediment data. Somewhat speculatively, the model suggests a date of ∼1937 for the previous MGT break-off and around or before ∼2083 for the next. With the MGT being primed to break-off every ∼73years, the precise date being governed by unpredictable external events such as collisions by large icebergs, such cycles have probably occurred for many thousands of years. |
format |
Article in Journal/Newspaper |
author |
Giles, AB |
author_facet |
Giles, AB |
author_sort |
Giles, AB |
title |
The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future |
title_short |
The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future |
title_full |
The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future |
title_fullStr |
The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future |
title_full_unstemmed |
The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future |
title_sort |
mertz glacier tongue, east antarctica. changes in the past 100 years and its cyclic nature - past, present and future |
publisher |
Elsevier Science Inc |
publishDate |
2017 |
url |
https://doi.org/10.1016/j.rse.2017.01.003 http://ecite.utas.edu.au/114106 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(145.500,145.500,-67.167,-67.167) |
geographic |
East Antarctica Mertz Glacier Mertz Glacier Tongue |
geographic_facet |
East Antarctica Mertz Glacier Mertz Glacier Tongue |
genre |
Antarc* Antarctica East Antarctica Mertz Glacier |
genre_facet |
Antarc* Antarctica East Antarctica Mertz Glacier |
op_relation |
http://dx.doi.org/10.1016/j.rse.2017.01.003 Giles, AB, The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future, Remote Sensing of Environment, 191 pp. 30-37. ISSN 0034-4257 (2017) [Refereed Article] http://ecite.utas.edu.au/114106 |
op_doi |
https://doi.org/10.1016/j.rse.2017.01.003 |
container_title |
Remote Sensing of Environment |
container_volume |
191 |
container_start_page |
30 |
op_container_end_page |
37 |
_version_ |
1766171028127481856 |