Examining the interaction between multi‐year landfast sea ice and the Mertz Glacier Tongue, East Antarctica: Another factor in ice sheet stability?
Identifieur interne : 007292 ( Main/Exploration ); précédent : 007291; suivant : 007293Examining the interaction between multi‐year landfast sea ice and the Mertz Glacier Tongue, East Antarctica: Another factor in ice sheet stability?
Auteurs : Robert A. Massom [Australie] ; A. Barry Giles [Australie] ; Helen A. Fricker [États-Unis] ; Roland C. Warner [Australie] ; Benoit Legrésy [France] ; Glenn Hyland [Australie] ; Neal Young [Australie] ; Alexander D. Fraser [Australie]Source :
- Journal of Geophysical Research: Oceans [ 0148-0227 ] ; 2010-12.
Descripteurs français
- Pascal (Inist)
- Accrétion, Age, Antarctique Est, Be 10, Changement climatique, Climatologie dynamique, Couplage, Croissance, Echelon régional, Epaisseur, Frasil, Glace fixée, Glace flottante, Glace marine, Glacier, Iceberg, Inlandsis Antarctique, Langue glacier, Observation par satellite, Plateau glace, Plateforme glace, Stabilité, Télédétection spatiale, Vêlage glace, Zone polaire.
- Wicri :
- topic : Antarctique, Changement climatique.
English descriptors
- KwdEn :
- Antarctic, Antarctic ice sheet, Antarctica, Area extent, Be-10, Climate change, Dynamical climatology, East Antarctica, East antarctica, Eastern flank, Eastern margin, Elevation, Fixed ice, Floating ice, Frazil ice, Fricker, Geophys, Glacial tongue, Glacier, Glacier tongue, Glacier tongues, Glaciol, Ice calving, Ice shelf, Iceberg, Icesat, Landfast, Landsat, Laser, Lett, Mass balance, Massom, Mertz, Mertz glacier, Mertz glacier tongue, Modis, Modis imagery, Myfi, Myfi extent, Myfi slab, Myfi thickness, Nasa, Ninnis, Ninnis glacier, Ninnis glacier tongue, November, Oceanic conditions, October, Polar region, Radarsat, Regional scope, Rift, Rignot, Satellite observation, Scambos, September, Snow accumulation, Space remote sensing, Surface elevation, Thick myfi, Time series, Warming ocean, West antarctic, accretion, age, climate change, coupling, glaciers, growth, ice shelves, icebergs, sea ice, stability, thickness.
- Teeft :
- Antarctic, Antarctica, Area extent, Climate change, East antarctica, Eastern flank, Eastern margin, Elevation, Fricker, Geophys, Glacier, Glacier tongue, Glacier tongues, Glaciol, Iceberg, Icesat, Landfast, Landsat, Laser, Lett, Mass balance, Massom, Mertz, Mertz glacier, Mertz glacier tongue, Modis, Modis imagery, Myfi, Myfi extent, Myfi slab, Myfi thickness, Nasa, Ninnis, Ninnis glacier, Ninnis glacier tongue, November, Oceanic conditions, October, Radarsat, Rift, Rignot, Scambos, September, Snow accumulation, Surface elevation, Thick myfi, Time series, Warming ocean, West antarctic.
Abstract
The Mertz Glacier tongue (MGT), East Antarctica, has a large area of multi‐year fast sea ice (MYFI) attached to its eastern edge. We use various satellite data sets to study the extent, age, and thickness of the MYFI and how it interacts with the MGT. We estimate its age to be at least 25 years and its thickness to be 10–55 m; this is an order of magnitude thicker than the average regional sea‐ice thickness and too thick to be formed through sea‐ice growth alone. We speculate that the most plausible process for its growth after initial formation is marine (frazil) ice accretion. The satellite data provide two types of evidence for strong mechanical coupling between the two types of ice: The MYFI moves with the MGT, and persistent rifts that originate in the MGT continue to propagate for large distances into the MYFI. The area of MYFI decreased by 50% following the departure of two large tabular icebergs that acted as pinning points and protective barriers. Future MYFI extent will be affected by subsequent icebergs from the Ninnis Glacier and the imminent calving of the MGT. Fast ice is vulnerable to changing atmospheric and oceanic conditions, and its disappearance may have an influence on ice tongue/ice shelf stability. Understanding the influence of thick MYFI on floating ice tongues/ice shelves may be significant to understanding the processes that control their evolution and how these respond to climate change, and thus to predicting the future of the Antarctic Ice Sheet.
Url:
DOI: 10.1029/2009JC006083
Affiliations:
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Fraser</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Sandy Bay, Tasmania</wicri:regionArea><wicri:noRegion>Tasmania</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Institute of Marine and Antarctic Studies, University of Tasmania, Sandy Bay, Tasmania</wicri:regionArea><wicri:noRegion>Tasmania</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Geophysical Research: Oceans</title><title level="j" type="alt">JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><biblScope unit="vol">115</biblScope><biblScope unit="issue">C12</biblScope><biblScope unit="page-count">15</biblScope><date type="published" when="2010-12">2010-12</date></imprint><idno type="ISSN">0148-0227</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Antarctic</term><term>Antarctic ice sheet</term><term>Antarctica</term><term>Area extent</term><term>Be-10</term><term>Climate change</term><term>Dynamical climatology</term><term>East Antarctica</term><term>East antarctica</term><term>Eastern flank</term><term>Eastern margin</term><term>Elevation</term><term>Fixed ice</term><term>Floating ice</term><term>Frazil ice</term><term>Fricker</term><term>Geophys</term><term>Glacial tongue</term><term>Glacier</term><term>Glacier tongue</term><term>Glacier tongues</term><term>Glaciol</term><term>Ice calving</term><term>Ice shelf</term><term>Iceberg</term><term>Icesat</term><term>Landfast</term><term>Landsat</term><term>Laser</term><term>Lett</term><term>Mass balance</term><term>Massom</term><term>Mertz</term><term>Mertz glacier</term><term>Mertz glacier tongue</term><term>Modis</term><term>Modis imagery</term><term>Myfi</term><term>Myfi extent</term><term>Myfi slab</term><term>Myfi thickness</term><term>Nasa</term><term>Ninnis</term><term>Ninnis glacier</term><term>Ninnis glacier tongue</term><term>November</term><term>Oceanic conditions</term><term>October</term><term>Polar region</term><term>Radarsat</term><term>Regional scope</term><term>Rift</term><term>Rignot</term><term>Satellite observation</term><term>Scambos</term><term>September</term><term>Snow accumulation</term><term>Space remote sensing</term><term>Surface elevation</term><term>Thick myfi</term><term>Time series</term><term>Warming ocean</term><term>West antarctic</term><term>accretion</term><term>age</term><term>climate change</term><term>coupling</term><term>glaciers</term><term>growth</term><term>ice shelves</term><term>icebergs</term><term>sea ice</term><term>stability</term><term>thickness</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Accrétion</term><term>Age</term><term>Antarctique Est</term><term>Be 10</term><term>Changement climatique</term><term>Climatologie dynamique</term><term>Couplage</term><term>Croissance</term><term>Echelon régional</term><term>Epaisseur</term><term>Frasil</term><term>Glace fixée</term><term>Glace flottante</term><term>Glace marine</term><term>Glacier</term><term>Iceberg</term><term>Inlandsis Antarctique</term><term>Langue glacier</term><term>Observation par satellite</term><term>Plateau glace</term><term>Plateforme glace</term><term>Stabilité</term><term>Télédétection spatiale</term><term>Vêlage glace</term><term>Zone polaire</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Antarctic</term><term>Antarctica</term><term>Area extent</term><term>Climate change</term><term>East antarctica</term><term>Eastern flank</term><term>Eastern margin</term><term>Elevation</term><term>Fricker</term><term>Geophys</term><term>Glacier</term><term>Glacier tongue</term><term>Glacier tongues</term><term>Glaciol</term><term>Iceberg</term><term>Icesat</term><term>Landfast</term><term>Landsat</term><term>Laser</term><term>Lett</term><term>Mass balance</term><term>Massom</term><term>Mertz</term><term>Mertz glacier</term><term>Mertz glacier tongue</term><term>Modis</term><term>Modis imagery</term><term>Myfi</term><term>Myfi extent</term><term>Myfi slab</term><term>Myfi thickness</term><term>Nasa</term><term>Ninnis</term><term>Ninnis glacier</term><term>Ninnis glacier tongue</term><term>November</term><term>Oceanic conditions</term><term>October</term><term>Radarsat</term><term>Rift</term><term>Rignot</term><term>Scambos</term><term>September</term><term>Snow accumulation</term><term>Surface elevation</term><term>Thick myfi</term><term>Time series</term><term>Warming ocean</term><term>West antarctic</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Antarctique</term><term>Changement climatique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">The Mertz Glacier tongue (MGT), East Antarctica, has a large area of multi‐year fast sea ice (MYFI) attached to its eastern edge. We use various satellite data sets to study the extent, age, and thickness of the MYFI and how it interacts with the MGT. We estimate its age to be at least 25 years and its thickness to be 10–55 m; this is an order of magnitude thicker than the average regional sea‐ice thickness and too thick to be formed through sea‐ice growth alone. We speculate that the most plausible process for its growth after initial formation is marine (frazil) ice accretion. The satellite data provide two types of evidence for strong mechanical coupling between the two types of ice: The MYFI moves with the MGT, and persistent rifts that originate in the MGT continue to propagate for large distances into the MYFI. The area of MYFI decreased by 50% following the departure of two large tabular icebergs that acted as pinning points and protective barriers. Future MYFI extent will be affected by subsequent icebergs from the Ninnis Glacier and the imminent calving of the MGT. Fast ice is vulnerable to changing atmospheric and oceanic conditions, and its disappearance may have an influence on ice tongue/ice shelf stability. Understanding the influence of thick MYFI on floating ice tongues/ice shelves may be significant to understanding the processes that control their evolution and how these respond to climate change, and thus to predicting the future of the Antarctic Ice Sheet.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>États-Unis</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Toulouse</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Massom, Robert A" sort="Massom, Robert A" uniqKey="Massom R" first="Robert A." last="Massom">Robert A. Massom</name></noRegion><name sortKey="Fraser, Alexander D" sort="Fraser, Alexander D" uniqKey="Fraser A" first="Alexander D." last="Fraser">Alexander D. Fraser</name><name sortKey="Fraser, Alexander D" sort="Fraser, Alexander D" uniqKey="Fraser A" first="Alexander D." last="Fraser">Alexander D. Fraser</name><name sortKey="Giles, A Barry" sort="Giles, A Barry" uniqKey="Giles A" first="A. Barry" last="Giles">A. Barry Giles</name><name sortKey="Hyland, Glenn" sort="Hyland, Glenn" uniqKey="Hyland G" first="Glenn" last="Hyland">Glenn Hyland</name><name sortKey="Hyland, Glenn" sort="Hyland, Glenn" uniqKey="Hyland G" first="Glenn" last="Hyland">Glenn Hyland</name><name sortKey="Massom, Robert A" sort="Massom, Robert A" uniqKey="Massom R" first="Robert A." last="Massom">Robert A. Massom</name><name sortKey="Massom, Robert A" sort="Massom, Robert A" uniqKey="Massom R" first="Robert A." last="Massom">Robert A. Massom</name><name sortKey="Massom, Robert A" sort="Massom, Robert A" uniqKey="Massom R" first="Robert A." last="Massom">Robert A. Massom</name><name sortKey="Warner, Roland C" sort="Warner, Roland C" uniqKey="Warner R" first="Roland C." last="Warner">Roland C. Warner</name><name sortKey="Warner, Roland C" sort="Warner, Roland C" uniqKey="Warner R" first="Roland C." last="Warner">Roland C. Warner</name><name sortKey="Young, Neal" sort="Young, Neal" uniqKey="Young N" first="Neal" last="Young">Neal Young</name><name sortKey="Young, Neal" sort="Young, Neal" uniqKey="Young N" first="Neal" last="Young">Neal Young</name></country><country name="États-Unis"><noRegion><name sortKey="Fricker, Helen A" sort="Fricker, Helen A" uniqKey="Fricker H" first="Helen A." last="Fricker">Helen A. Fricker</name></noRegion></country><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Legresy, Benoit" sort="Legresy, Benoit" uniqKey="Legresy B" first="Benoit" last="Legrésy">Benoit Legrésy</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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