Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica
Geomorphological survey of ice-free areas, observation on ablation in a marginal zone of the ice sheet, and measurement of earth temperature were conducted by the author in the austral summer of 1971/1972 and during the period from January 1974 to February 1975. Directions of the former ice flow inf...
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National Institute of Polar Research
1976
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Online Access: | https://doi.org/10.15094/00007878 https://doaj.org/article/72c658ef40ea480e8658c9a529076478 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:72c658ef40ea480e8658c9a529076478 2023-05-15T13:38:15+02:00 Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica Kiichi MORIWAKI 1976-12-01 https://doi.org/10.15094/00007878 https://doaj.org/article/72c658ef40ea480e8658c9a529076478 en other eng National Institute of Polar Research doi:10.15094/00007878 0085-7289 2432-079X https://doaj.org/article/72c658ef40ea480e8658c9a529076478 undefined Antarctic Record, Iss 57, Pp 24-55 (1976) geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 1976 fttriple https://doi.org/10.15094/00007878 2023-01-22T18:14:08Z Geomorphological survey of ice-free areas, observation on ablation in a marginal zone of the ice sheet, and measurement of earth temperature were conducted by the author in the austral summer of 1971/1972 and during the period from January 1974 to February 1975. Directions of the former ice flow inferred from glacial striae in the ice-free areas were perpendicular to the present coast on the whole. Directions of glacial striae on the valley wall of the Langhovde Glacier differ greatly from the direction of present glacier flow. This seems to suggest that the direction of movement of the upper part of ice was different from that of the lower part of ice when the ice sheet was thicker than the present. The amount of deposits forming moraine ridges at the fringe of the ice sheet is considerably small. These moraines are evidently caused by thrusting of active ice on stagnant bottom ice. Therefore, glacial till in the ice sheet may be small in amount at least in the vicinity of Syowa Station. Earth temperature in summer on East Ongul Island rarely rises and falls beyond the freezing point. Once it exceeds 0℃ at the beginning of summer, it remains above 0℃ till the end of that summer. This may be one of the causes for poor development of sorted polygon on East Ongul Island. Raised beaches are widely distributed on the east coast of Lutzow-Holm Bay and Prince Olav Coast. The upper limit of the marine-boulder pavement is measured to be 35m in height at Cape Hinode. Chemical analysis of the water of Lake Akebi suggests that the uplift of over 50m relative to the present sea level did not take place in this area after the retreat of the ice sheet. In summer, meltwater streams seem to play an important part in wastage of the marginal part of the ice sheet. Measurements of meltwater and evaporation at Cape Hinode have amounted to 46.6×l0^3t/km/day and 0.14-0.25g/cm^2/day, respectively. The movement of the marginal part of the ice sheet behind Cape Hinode was 0.5-6m/year (mean value : 2m/year) from January 1972 to January ... Article in Journal/Newspaper Antarc* Antarctica East Ongul Island Ice Sheet Ongul Island Prince Olav Coast Unknown Austral Syowa Station Ongul ENVELOPE(39.533,39.533,-69.017,-69.017) Ongul Island ENVELOPE(39.533,39.533,-69.017,-69.017) Langhovde ENVELOPE(39.733,39.733,-69.217,-69.217) Prince Olav Coast ENVELOPE(41.000,41.000,-69.000,-69.000) East Ongul Island ENVELOPE(39.583,39.583,-69.017,-69.017) Cape Hinode ENVELOPE(42.633,42.633,-68.117,-68.117) Langhovde Glacier ENVELOPE(39.783,39.783,-69.200,-69.200) Boulder Pavement ENVELOPE(161.756,161.756,-77.523,-77.523) |
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Open Polar |
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Unknown |
op_collection_id |
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language |
English |
topic |
geo |
spellingShingle |
geo Kiichi MORIWAKI Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica |
topic_facet |
geo |
description |
Geomorphological survey of ice-free areas, observation on ablation in a marginal zone of the ice sheet, and measurement of earth temperature were conducted by the author in the austral summer of 1971/1972 and during the period from January 1974 to February 1975. Directions of the former ice flow inferred from glacial striae in the ice-free areas were perpendicular to the present coast on the whole. Directions of glacial striae on the valley wall of the Langhovde Glacier differ greatly from the direction of present glacier flow. This seems to suggest that the direction of movement of the upper part of ice was different from that of the lower part of ice when the ice sheet was thicker than the present. The amount of deposits forming moraine ridges at the fringe of the ice sheet is considerably small. These moraines are evidently caused by thrusting of active ice on stagnant bottom ice. Therefore, glacial till in the ice sheet may be small in amount at least in the vicinity of Syowa Station. Earth temperature in summer on East Ongul Island rarely rises and falls beyond the freezing point. Once it exceeds 0℃ at the beginning of summer, it remains above 0℃ till the end of that summer. This may be one of the causes for poor development of sorted polygon on East Ongul Island. Raised beaches are widely distributed on the east coast of Lutzow-Holm Bay and Prince Olav Coast. The upper limit of the marine-boulder pavement is measured to be 35m in height at Cape Hinode. Chemical analysis of the water of Lake Akebi suggests that the uplift of over 50m relative to the present sea level did not take place in this area after the retreat of the ice sheet. In summer, meltwater streams seem to play an important part in wastage of the marginal part of the ice sheet. Measurements of meltwater and evaporation at Cape Hinode have amounted to 46.6×l0^3t/km/day and 0.14-0.25g/cm^2/day, respectively. The movement of the marginal part of the ice sheet behind Cape Hinode was 0.5-6m/year (mean value : 2m/year) from January 1972 to January ... |
format |
Article in Journal/Newspaper |
author |
Kiichi MORIWAKI |
author_facet |
Kiichi MORIWAKI |
author_sort |
Kiichi MORIWAKI |
title |
Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica |
title_short |
Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica |
title_full |
Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica |
title_fullStr |
Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica |
title_full_unstemmed |
Glacio-Geomorphological Observations in and around Ice-Free Areas in the Vicinity of Syowa Station, Antarctica |
title_sort |
glacio-geomorphological observations in and around ice-free areas in the vicinity of syowa station, antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1976 |
url |
https://doi.org/10.15094/00007878 https://doaj.org/article/72c658ef40ea480e8658c9a529076478 |
long_lat |
ENVELOPE(39.533,39.533,-69.017,-69.017) ENVELOPE(39.533,39.533,-69.017,-69.017) ENVELOPE(39.733,39.733,-69.217,-69.217) ENVELOPE(41.000,41.000,-69.000,-69.000) ENVELOPE(39.583,39.583,-69.017,-69.017) ENVELOPE(42.633,42.633,-68.117,-68.117) ENVELOPE(39.783,39.783,-69.200,-69.200) ENVELOPE(161.756,161.756,-77.523,-77.523) |
geographic |
Austral Syowa Station Ongul Ongul Island Langhovde Prince Olav Coast East Ongul Island Cape Hinode Langhovde Glacier Boulder Pavement |
geographic_facet |
Austral Syowa Station Ongul Ongul Island Langhovde Prince Olav Coast East Ongul Island Cape Hinode Langhovde Glacier Boulder Pavement |
genre |
Antarc* Antarctica East Ongul Island Ice Sheet Ongul Island Prince Olav Coast |
genre_facet |
Antarc* Antarctica East Ongul Island Ice Sheet Ongul Island Prince Olav Coast |
op_source |
Antarctic Record, Iss 57, Pp 24-55 (1976) |
op_relation |
doi:10.15094/00007878 0085-7289 2432-079X https://doaj.org/article/72c658ef40ea480e8658c9a529076478 |
op_rights |
undefined |
op_doi |
https://doi.org/10.15094/00007878 |
_version_ |
1766103146672685056 |