Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile
[1] Rates of glacial erosion in temperate climates rank among the highest worldwide, and the sedimentary products of such erosion record climatic and tectonic signals in many glaciated settings, as well as temporal changes in glacier behavior. Glacial sediment yields are expected to decrease with in...
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ftriceuniv:oai:scholarship.rice.edu:1911/88240 2023-06-11T04:04:57+02:00 Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile Boldt, Katherine V. Nittrouer, Charles A. Hallet, Bernard Koppes, Michele N. Forrest, Brittany K. Wellner, Julia S. Anderson, John B. 2013 application/pdf https://hdl.handle.net/1911/88240 https://doi.org/10.1002/jgrf.20145 eng eng Wiley Boldt, Katherine V., Nittrouer, Charles A., Hallet, Bernard, et al. "Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile." Journal of Geophysical Research: Earth Surface, 118, no. 4 (2013) Wiley: 2072-2088. http://dx.doi.org/10.1002/jgrf.20145. https://hdl.handle.net/1911/88240 http://dx.doi.org/10.1002/jgrf.20145 Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. sediments 210-Pb geochronology glacial erosion regional warming Antarctic Peninsula Patagonia Journal article Text publisher version 2013 ftriceuniv https://doi.org/10.1002/jgrf.20145 2023-05-06T22:30:57Z [1] Rates of glacial erosion in temperate climates rank among the highest worldwide, and the sedimentary products of such erosion record climatic and tectonic signals in many glaciated settings, as well as temporal changes in glacier behavior. Glacial sediment yields are expected to decrease with increasing latitude because decreased temperature and meltwater production reduce glacial sliding, erosion, and sediment transfer; however, this expectation lacks a solid supportive database. Herein we present modern 210Pb-derived sediment accumulation rates on decadal to century time scales for 12 fjords spanning 15° of latitude from the Antarctic Peninsula to southern Chile and interpret the results in light of glacimarine sediment accumulation worldwide. 210Pb records from the Antarctic Peninsula show surprisingly steady sediment accumulation throughout the past century at rates of 1–7 mm yr−1, despite rapid warming and glacial retreat. Cores from the South Shetland Islands reveal accelerated sediment accumulation over the past few decades, likely due to changes in the thermal state of the glaciers in this region, which straddles the boundary between subpolar and temperate conditions. In Patagonia and Tierra del Fuego, sediment accumulates faster (11–24 mm yr−1), and previously collected seismic profiles show that rates reach meters per year close to the glacier termini. This increase in sediment accumulation rates with decreasing latitude reflects the gradient from subpolar to temperate climates and is consistent with glacial erosion being much faster in the temperate climate of southern Chile than in the polar climate of the Antarctic Peninsula. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula South Shetland Islands Tierra del Fuego Rice University: Digital Scholarship Archive Antarctic The Antarctic Antarctic Peninsula Patagonia South Shetland Islands Journal of Geophysical Research: Earth Surface 118 4 2072 2088 |
institution |
Open Polar |
collection |
Rice University: Digital Scholarship Archive |
op_collection_id |
ftriceuniv |
language |
English |
topic |
sediments 210-Pb geochronology glacial erosion regional warming Antarctic Peninsula Patagonia |
spellingShingle |
sediments 210-Pb geochronology glacial erosion regional warming Antarctic Peninsula Patagonia Boldt, Katherine V. Nittrouer, Charles A. Hallet, Bernard Koppes, Michele N. Forrest, Brittany K. Wellner, Julia S. Anderson, John B. Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile |
topic_facet |
sediments 210-Pb geochronology glacial erosion regional warming Antarctic Peninsula Patagonia |
description |
[1] Rates of glacial erosion in temperate climates rank among the highest worldwide, and the sedimentary products of such erosion record climatic and tectonic signals in many glaciated settings, as well as temporal changes in glacier behavior. Glacial sediment yields are expected to decrease with increasing latitude because decreased temperature and meltwater production reduce glacial sliding, erosion, and sediment transfer; however, this expectation lacks a solid supportive database. Herein we present modern 210Pb-derived sediment accumulation rates on decadal to century time scales for 12 fjords spanning 15° of latitude from the Antarctic Peninsula to southern Chile and interpret the results in light of glacimarine sediment accumulation worldwide. 210Pb records from the Antarctic Peninsula show surprisingly steady sediment accumulation throughout the past century at rates of 1–7 mm yr−1, despite rapid warming and glacial retreat. Cores from the South Shetland Islands reveal accelerated sediment accumulation over the past few decades, likely due to changes in the thermal state of the glaciers in this region, which straddles the boundary between subpolar and temperate conditions. In Patagonia and Tierra del Fuego, sediment accumulates faster (11–24 mm yr−1), and previously collected seismic profiles show that rates reach meters per year close to the glacier termini. This increase in sediment accumulation rates with decreasing latitude reflects the gradient from subpolar to temperate climates and is consistent with glacial erosion being much faster in the temperate climate of southern Chile than in the polar climate of the Antarctic Peninsula. |
format |
Article in Journal/Newspaper |
author |
Boldt, Katherine V. Nittrouer, Charles A. Hallet, Bernard Koppes, Michele N. Forrest, Brittany K. Wellner, Julia S. Anderson, John B. |
author_facet |
Boldt, Katherine V. Nittrouer, Charles A. Hallet, Bernard Koppes, Michele N. Forrest, Brittany K. Wellner, Julia S. Anderson, John B. |
author_sort |
Boldt, Katherine V. |
title |
Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile |
title_short |
Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile |
title_full |
Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile |
title_fullStr |
Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile |
title_full_unstemmed |
Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile |
title_sort |
modern rates of glacial sediment accumulation along a 15° s-n transect in fjords from the antarctic peninsula to southern chile |
publisher |
Wiley |
publishDate |
2013 |
url |
https://hdl.handle.net/1911/88240 https://doi.org/10.1002/jgrf.20145 |
geographic |
Antarctic The Antarctic Antarctic Peninsula Patagonia South Shetland Islands |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Patagonia South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Peninsula South Shetland Islands Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctic Peninsula South Shetland Islands Tierra del Fuego |
op_relation |
Boldt, Katherine V., Nittrouer, Charles A., Hallet, Bernard, et al. "Modern rates of glacial sediment accumulation along a 15° S-N transect in fjords from the Antarctic Peninsula to southern Chile." Journal of Geophysical Research: Earth Surface, 118, no. 4 (2013) Wiley: 2072-2088. http://dx.doi.org/10.1002/jgrf.20145. https://hdl.handle.net/1911/88240 http://dx.doi.org/10.1002/jgrf.20145 |
op_rights |
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. |
op_doi |
https://doi.org/10.1002/jgrf.20145 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
118 |
container_issue |
4 |
container_start_page |
2072 |
op_container_end_page |
2088 |
_version_ |
1768392249171771392 |