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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ftunivtasmania:oai:eprints.utas.edu.au:38941 2023-05-15T13:42:39+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://eprints.utas.edu.au/38941/ https://doi.org/10.1016/j.rse.2017.01.003 unknown Elsevier Science Inc Giles, AB 2017 , 'The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future' , Remote Sensing of Environment, vol. 191 , pp. 30-37 , doi:10.1016/j.rse.2017.01.003 <http://dx.doi.org/10.1016/j.rse.2017.01.003>. Antarctic glacier tongue flow satellite remote sensing feature tracking Mertz Glacier Tongue Article PeerReviewed 2017 ftunivtasmania https://doi.org/10.1016/j.rse.2017.01.003 2021-12-13T23:18:00Z 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 1911–1914 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 1947–2010 is 1180 ± 14 m y− 1 with an accompanying ice-front loss rate of ∼ 190 m y− 1. A simple model for the MGT exhibits a ∼ 73 year 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 ∼ 73 years, 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* Antarctic Antarctica East Antarctica Iceberg* Mertz Glacier University of Tasmania: UTas ePrints Antarctic 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 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
Antarctic glacier tongue flow satellite remote sensing feature tracking Mertz Glacier Tongue |
spellingShingle |
Antarctic glacier tongue flow satellite remote sensing feature tracking Mertz Glacier Tongue Giles, AB The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future |
topic_facet |
Antarctic glacier tongue flow satellite remote sensing feature tracking Mertz Glacier Tongue |
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 1911–1914 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 1947–2010 is 1180 ± 14 m y− 1 with an accompanying ice-front loss rate of ∼ 190 m y− 1. A simple model for the MGT exhibits a ∼ 73 year 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 ∼ 73 years, 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://eprints.utas.edu.au/38941/ https://doi.org/10.1016/j.rse.2017.01.003 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(145.500,145.500,-67.167,-67.167) |
geographic |
Antarctic East Antarctica Mertz Glacier Mertz Glacier Tongue |
geographic_facet |
Antarctic East Antarctica Mertz Glacier Mertz Glacier Tongue |
genre |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Mertz Glacier |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Mertz Glacier |
op_relation |
Giles, AB 2017 , 'The Mertz Glacier Tongue, East Antarctica. Changes in the past 100 years and its cyclic nature - past, present and future' , Remote Sensing of Environment, vol. 191 , pp. 30-37 , doi:10.1016/j.rse.2017.01.003 <http://dx.doi.org/10.1016/j.rse.2017.01.003>. |
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_ |
1766170734569193472 |