Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield
Bathymetric and sub-bottom acoustic data were collected in Laguna San Rafael, Chile, to determine sediment yields during the Little Ice Age advance and subsequent retreat of San Rafael Glacier. The sediment volumes and subaqueous landforms imaged are used to interpret the proglacial dynamics and est...
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Online Access: | https://doi.org/10.1016/j.yqres.2009.07.006 https://repositorio.uchile.cl/handle/2250/153305 |
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ftunivchile:oai:repositorio.uchile.cl:2250/153305 2023-05-15T18:33:04+02:00 Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield Koppes, Michèle Sylwester, Richard Rivera, Andres Hallet, Bernard 2010 application/pdf https://doi.org/10.1016/j.yqres.2009.07.006 https://repositorio.uchile.cl/handle/2250/153305 en eng Elsevier Quaternary Research 73 (2010) 84–95 00335894 10960287 doi:10.1016/j.yqres.2009.07.006 https://repositorio.uchile.cl/handle/2250/153305 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Quaternary Research Acoustic reflection profiles Glacial erosion rates Little Ice Age North Patagonia Sediment yields Subaqueous geomorphology Artículo de revista 2010 ftunivchile https://doi.org/10.1016/j.yqres.2009.07.006 2023-01-22T00:57:19Z Bathymetric and sub-bottom acoustic data were collected in Laguna San Rafael, Chile, to determine sediment yields during the Little Ice Age advance and subsequent retreat of San Rafael Glacier. The sediment volumes and subaqueous landforms imaged are used to interpret the proglacial dynamics and estimate erosion rates from a temperate tidewater glacier over a complete advance–retreat cycle. Sediment yields from San Rafael Glacier averaged 2.7×107 m3/a since the end of the Little Ice Age, circa AD 1898, corresponding to average basin-wide erosion rates of 23±9 mm/a; the highest erosion rates, 68±23 mm/a, occurred at the start of the retreat phase, and have since been steadily decreasing. Erosion rates were much lower during glacial advance, averaging at most 7 mm/a, than during retreat. Such large glacial sediment yields over two centuries of advance and retreat suggest that the contribution of sediments stored subglacially cannot account for much of the sediment being delivered to the terminus today. The detailed sub-bottom information of a proglacial lagoon yields important clues as to the timing of erosion, deposition and transfer of glacigenic sediments from orogens to the continental shelves, and the influence of glacier dynamics on this process. Article in Journal/Newspaper Tidewater Universidad de Chile: Repositorio académico Patagonia Quaternary Research 73 1 84 95 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Acoustic reflection profiles Glacial erosion rates Little Ice Age North Patagonia Sediment yields Subaqueous geomorphology |
spellingShingle |
Acoustic reflection profiles Glacial erosion rates Little Ice Age North Patagonia Sediment yields Subaqueous geomorphology Koppes, Michèle Sylwester, Richard Rivera, Andres Hallet, Bernard Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield |
topic_facet |
Acoustic reflection profiles Glacial erosion rates Little Ice Age North Patagonia Sediment yields Subaqueous geomorphology |
description |
Bathymetric and sub-bottom acoustic data were collected in Laguna San Rafael, Chile, to determine sediment yields during the Little Ice Age advance and subsequent retreat of San Rafael Glacier. The sediment volumes and subaqueous landforms imaged are used to interpret the proglacial dynamics and estimate erosion rates from a temperate tidewater glacier over a complete advance–retreat cycle. Sediment yields from San Rafael Glacier averaged 2.7×107 m3/a since the end of the Little Ice Age, circa AD 1898, corresponding to average basin-wide erosion rates of 23±9 mm/a; the highest erosion rates, 68±23 mm/a, occurred at the start of the retreat phase, and have since been steadily decreasing. Erosion rates were much lower during glacial advance, averaging at most 7 mm/a, than during retreat. Such large glacial sediment yields over two centuries of advance and retreat suggest that the contribution of sediments stored subglacially cannot account for much of the sediment being delivered to the terminus today. The detailed sub-bottom information of a proglacial lagoon yields important clues as to the timing of erosion, deposition and transfer of glacigenic sediments from orogens to the continental shelves, and the influence of glacier dynamics on this process. |
format |
Article in Journal/Newspaper |
author |
Koppes, Michèle Sylwester, Richard Rivera, Andres Hallet, Bernard |
author_facet |
Koppes, Michèle Sylwester, Richard Rivera, Andres Hallet, Bernard |
author_sort |
Koppes, Michèle |
title |
Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield |
title_short |
Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield |
title_full |
Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield |
title_fullStr |
Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield |
title_full_unstemmed |
Variations in sediment yield over the advance and retreat of a calving glacier, Laguna San Rafael, North Patagonian Icefield |
title_sort |
variations in sediment yield over the advance and retreat of a calving glacier, laguna san rafael, north patagonian icefield |
publisher |
Elsevier |
publishDate |
2010 |
url |
https://doi.org/10.1016/j.yqres.2009.07.006 https://repositorio.uchile.cl/handle/2250/153305 |
geographic |
Patagonia |
geographic_facet |
Patagonia |
genre |
Tidewater |
genre_facet |
Tidewater |
op_source |
Quaternary Research |
op_relation |
Quaternary Research 73 (2010) 84–95 00335894 10960287 doi:10.1016/j.yqres.2009.07.006 https://repositorio.uchile.cl/handle/2250/153305 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.yqres.2009.07.006 |
container_title |
Quaternary Research |
container_volume |
73 |
container_issue |
1 |
container_start_page |
84 |
op_container_end_page |
95 |
_version_ |
1766217353193848832 |