The Recent Advance of the Ross Ice Shelf Antarctica
Abstract The seaward edge of the Ross Ice Shelf advanced northward at a minimum average velocity of 0.8 km a –1 between 1962 and 1985. That advance approximated velocities that have been obtained from glaciological data, indicating little recent wastage by iceberg calving. West of long. 178° E., the...
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crcambridgeupr:10.1017/s0022143000012181 2024-03-03T08:37:29+00:00 The Recent Advance of the Ross Ice Shelf Antarctica Jacobs, S. S. Macayeal, D. R. Ardai, J. L. 1986 http://dx.doi.org/10.1017/s0022143000012181 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012181 en eng Cambridge University Press (CUP) Journal of Glaciology volume 32, issue 112, page 464-474 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1986 crcambridgeupr https://doi.org/10.1017/s0022143000012181 2024-02-08T08:34:04Z Abstract The seaward edge of the Ross Ice Shelf advanced northward at a minimum average velocity of 0.8 km a –1 between 1962 and 1985. That advance approximated velocities that have been obtained from glaciological data, indicating little recent wastage by iceberg calving. West of long. 178° E., the ice shelf has attained its most northerly position in the past 145 years, and has not experienced a major calving episode for at least 75 years. Since 1841 the ice-front position has advanced and retreated within a zone from about lat. 77° 10’S. (near long. 171° E.) to lat. 78° 40’ S. (near long. 164° W.). The central ice front is now farthest south but has the highest advance rate. Calving may occur at more frequent intervals in that sector, which also overlies the warmest ocean currents that flow into the sub-ice-shelf cavity. Available information on ice-shelf advance, thickness, spreading rate, and surface accumulation indicates a basal melting rate around 3 m a –1 near the ice front. These data and independent estimates imply that basal melting is nearly as large a factor as iceberg calving in maintaining the ice-shelf mass balance. In recent years, the Ross, Ronne, and Filchner Ice Shelves have contributed few icebergs to the Southern Ocean, while projections from a contemporaneous iceberg census are that circumpolar calving alone may exceed accumulation on the ice sheet. Large-scale ice-shelf calving may have preceded historical sightings of increased numbers of icebergs at sea. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf Southern Ocean Cambridge University Press Southern Ocean Ross Ice Shelf Journal of Glaciology 32 112 464 474 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Jacobs, S. S. Macayeal, D. R. Ardai, J. L. The Recent Advance of the Ross Ice Shelf Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Abstract The seaward edge of the Ross Ice Shelf advanced northward at a minimum average velocity of 0.8 km a –1 between 1962 and 1985. That advance approximated velocities that have been obtained from glaciological data, indicating little recent wastage by iceberg calving. West of long. 178° E., the ice shelf has attained its most northerly position in the past 145 years, and has not experienced a major calving episode for at least 75 years. Since 1841 the ice-front position has advanced and retreated within a zone from about lat. 77° 10’S. (near long. 171° E.) to lat. 78° 40’ S. (near long. 164° W.). The central ice front is now farthest south but has the highest advance rate. Calving may occur at more frequent intervals in that sector, which also overlies the warmest ocean currents that flow into the sub-ice-shelf cavity. Available information on ice-shelf advance, thickness, spreading rate, and surface accumulation indicates a basal melting rate around 3 m a –1 near the ice front. These data and independent estimates imply that basal melting is nearly as large a factor as iceberg calving in maintaining the ice-shelf mass balance. In recent years, the Ross, Ronne, and Filchner Ice Shelves have contributed few icebergs to the Southern Ocean, while projections from a contemporaneous iceberg census are that circumpolar calving alone may exceed accumulation on the ice sheet. Large-scale ice-shelf calving may have preceded historical sightings of increased numbers of icebergs at sea. |
format |
Article in Journal/Newspaper |
author |
Jacobs, S. S. Macayeal, D. R. Ardai, J. L. |
author_facet |
Jacobs, S. S. Macayeal, D. R. Ardai, J. L. |
author_sort |
Jacobs, S. S. |
title |
The Recent Advance of the Ross Ice Shelf Antarctica |
title_short |
The Recent Advance of the Ross Ice Shelf Antarctica |
title_full |
The Recent Advance of the Ross Ice Shelf Antarctica |
title_fullStr |
The Recent Advance of the Ross Ice Shelf Antarctica |
title_full_unstemmed |
The Recent Advance of the Ross Ice Shelf Antarctica |
title_sort |
recent advance of the ross ice shelf antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1986 |
url |
http://dx.doi.org/10.1017/s0022143000012181 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000012181 |
geographic |
Southern Ocean Ross Ice Shelf |
geographic_facet |
Southern Ocean Ross Ice Shelf |
genre |
Antarc* Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf Southern Ocean |
genre_facet |
Antarc* Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf Southern Ocean |
op_source |
Journal of Glaciology volume 32, issue 112, page 464-474 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000012181 |
container_title |
Journal of Glaciology |
container_volume |
32 |
container_issue |
112 |
container_start_page |
464 |
op_container_end_page |
474 |
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1792499175120699392 |