Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers
The coast of Victoria Land extends from Williamson Head (69°11'S, 158°E) to McMurdo Sound (77°S, 163°E). A comparison of various documents and images spanning several decades has allowed the ice front fluctuation and the iceberg calving flux during this century to be estimated. During the perio...
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ftunivroma3iris:oai:iris.uniroma3.it:11590/353641 2024-02-27T08:33:30+00:00 Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers Frezzotti M. Frezzotti, M. 1997 http://hdl.handle.net/11590/353641 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:A1997WM78000009 volume:9 issue:1 firstpage:61 lastpage:73 numberofpages:13 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11590/353641 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0030620818 20th century floating glacier ice front iceberg calving mass balance Victoria Land info:eu-repo/semantics/article 1997 ftunivroma3iris 2024-01-31T17:40:14Z The coast of Victoria Land extends from Williamson Head (69°11'S, 158°E) to McMurdo Sound (77°S, 163°E). A comparison of various documents and images spanning several decades has allowed the ice front fluctuation and the iceberg calving flux during this century to be estimated. During the periods from 1956-65 to 1972-73 the floating glaciers underwent a reduction of 978 km2with an iceberg calving flux of about 134 km2yr-1. After this, during the periods from 1972-73 to 1989-91, the floating glaciers underwent an advance of 272 km2with an iceberg calving flux of about 53 km2yr-1. Glacier tongues with bottom accretion calve less often than those with bottom melting. Most floating glaciers have shown cyclic behaviour without a strong trend. Exceptions to this general style are Hells Gate ice shelf, McMurdo Ice Shelf and floating glaciers of Cape Adare which have undergone a significant retreat since the beginning of the 20th century. The different behaviour of these floating glaciers has been hypothesized as being due to: increased energy available for meltwater production of marine ice that progressively warmed these thin ice shelves and then increased iceberg calving (Hells Gate and McMurdo), or to increased melting at the ice-ocean interface related to a major intrusion of Circumpolar Deep Water from the nearby continental slope (Cape Adare). An estimate of the mass balance of East Antarctica from which these glaciers are fed shows a positive value, that is significant despite all the uncertainties of balance measurements. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf McMurdo Sound Victoria Land Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Cape Adare ENVELOPE(175.000,175.000,-71.000,-71.000) East Antarctica Hells Gate ENVELOPE(163.800,163.800,-74.850,-74.850) McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) McMurdo Sound Victoria Land Williamson ENVELOPE(-65.383,-65.383,-67.717,-67.717) Williamson Head ENVELOPE(158.000,158.000,-69.183,-69.183) |
institution |
Open Polar |
collection |
Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) |
op_collection_id |
ftunivroma3iris |
language |
English |
topic |
20th century floating glacier ice front iceberg calving mass balance Victoria Land |
spellingShingle |
20th century floating glacier ice front iceberg calving mass balance Victoria Land Frezzotti M. Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers |
topic_facet |
20th century floating glacier ice front iceberg calving mass balance Victoria Land |
description |
The coast of Victoria Land extends from Williamson Head (69°11'S, 158°E) to McMurdo Sound (77°S, 163°E). A comparison of various documents and images spanning several decades has allowed the ice front fluctuation and the iceberg calving flux during this century to be estimated. During the periods from 1956-65 to 1972-73 the floating glaciers underwent a reduction of 978 km2with an iceberg calving flux of about 134 km2yr-1. After this, during the periods from 1972-73 to 1989-91, the floating glaciers underwent an advance of 272 km2with an iceberg calving flux of about 53 km2yr-1. Glacier tongues with bottom accretion calve less often than those with bottom melting. Most floating glaciers have shown cyclic behaviour without a strong trend. Exceptions to this general style are Hells Gate ice shelf, McMurdo Ice Shelf and floating glaciers of Cape Adare which have undergone a significant retreat since the beginning of the 20th century. The different behaviour of these floating glaciers has been hypothesized as being due to: increased energy available for meltwater production of marine ice that progressively warmed these thin ice shelves and then increased iceberg calving (Hells Gate and McMurdo), or to increased melting at the ice-ocean interface related to a major intrusion of Circumpolar Deep Water from the nearby continental slope (Cape Adare). An estimate of the mass balance of East Antarctica from which these glaciers are fed shows a positive value, that is significant despite all the uncertainties of balance measurements. |
author2 |
Frezzotti, M. |
format |
Article in Journal/Newspaper |
author |
Frezzotti M. |
author_facet |
Frezzotti M. |
author_sort |
Frezzotti M. |
title |
Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers |
title_short |
Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers |
title_full |
Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers |
title_fullStr |
Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers |
title_full_unstemmed |
Ice front fluctuation, iceberg calving flux and mass balance of Victoria Land glaciers |
title_sort |
ice front fluctuation, iceberg calving flux and mass balance of victoria land glaciers |
publishDate |
1997 |
url |
http://hdl.handle.net/11590/353641 |
long_lat |
ENVELOPE(170.233,170.233,-71.283,-71.283) ENVELOPE(175.000,175.000,-71.000,-71.000) ENVELOPE(163.800,163.800,-74.850,-74.850) ENVELOPE(166.500,166.500,-78.000,-78.000) ENVELOPE(-65.383,-65.383,-67.717,-67.717) ENVELOPE(158.000,158.000,-69.183,-69.183) |
geographic |
Adare Cape Adare East Antarctica Hells Gate McMurdo Ice Shelf McMurdo Sound Victoria Land Williamson Williamson Head |
geographic_facet |
Adare Cape Adare East Antarctica Hells Gate McMurdo Ice Shelf McMurdo Sound Victoria Land Williamson Williamson Head |
genre |
Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf McMurdo Sound Victoria Land |
genre_facet |
Antarc* Antarctica East Antarctica Ice Shelf Ice Shelves McMurdo Ice Shelf McMurdo Sound Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:A1997WM78000009 volume:9 issue:1 firstpage:61 lastpage:73 numberofpages:13 journal:ANTARCTIC SCIENCE http://hdl.handle.net/11590/353641 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0030620818 |
_version_ |
1792045981849616384 |