Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego
The island of Isla de los Estados is situated at 54.5°S, 64°W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recording atmospheric co...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.802154 2023-05-15T13:42:10+02:00 Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego Unkel, Ingmar Björck, Svante Wohlfarth, Barbara MEDIAN LATITUDE: -54.751110 * MEDIAN LONGITUDE: -64.333135 * SOUTH-BOUND LATITUDE: -54.764250 * WEST-BOUND LONGITUDE: -64.339080 * NORTH-BOUND LATITUDE: -54.737970 * EAST-BOUND LONGITUDE: -64.327190 * DATE/TIME START: 2005-12-01T00:00:00 * DATE/TIME END: 2005-12-01T00:00:00 2008-11-19 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.802154 https://doi.org/10.1594/PANGAEA.802154 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.802154 https://doi.org/10.1594/PANGAEA.802154 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Unkel, Ingmar; Björck, Svante; Wohlfarth, Barbara (2008): Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego. Quaternary Science Reviews, 27(15-16), 1541-1554, https://doi.org/10.1016/j.quascirev.2008.05.004 Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.802154 https://doi.org/10.1016/j.quascirev.2008.05.004 2023-01-20T07:32:47Z The island of Isla de los Estados is situated at 54.5°S, 64°W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recording atmospheric conditions but within an oceanic setting, can help to clarify changes of regional circulation patterns, both atmospheric and marine. Here, we present geochemical analyses from 16-10 ka cal BP of a peat core from Lago Galvarne Bog at the northern coast of the island, and a lake sediment core from Laguna Cascada 3 km further south. The data comprise TC, TN, loss on ignition analyses and continuous XRF scanning on both cores as well as age-depth modeling based on AMS-14C dating. Deglaciation and onset of peat formation in the coastal areas began before 16 ka cal BP followed by a rapid glacial retreat and the start of lacustrine sedimentation further inland. Data suggest initially windy conditions with permafrost succeeded by gradually warmer and wetter conditions until ca 14.5 ka cal BP. The warming trend slows down until ca 13.5 ka cal BP, followed by arid conditions culminating around 12.8 ka cal BP. Our data suggest fairly warm conditions and the establishment of denser peat and forest vegetation ca 10.6 ka cal BP, contemporaneous with the onset of the Antarctic thermal optimum. This indicates large-scale shifts in the placement of zonal flow and the Westerlies at the beginning of the Holocene. Dataset Antarc* Antarctic Antarctica permafrost Tierra del Fuego PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic ENVELOPE(-64.339080,-64.327190,-54.737970,-54.764250) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
The island of Isla de los Estados is situated at 54.5°S, 64°W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recording atmospheric conditions but within an oceanic setting, can help to clarify changes of regional circulation patterns, both atmospheric and marine. Here, we present geochemical analyses from 16-10 ka cal BP of a peat core from Lago Galvarne Bog at the northern coast of the island, and a lake sediment core from Laguna Cascada 3 km further south. The data comprise TC, TN, loss on ignition analyses and continuous XRF scanning on both cores as well as age-depth modeling based on AMS-14C dating. Deglaciation and onset of peat formation in the coastal areas began before 16 ka cal BP followed by a rapid glacial retreat and the start of lacustrine sedimentation further inland. Data suggest initially windy conditions with permafrost succeeded by gradually warmer and wetter conditions until ca 14.5 ka cal BP. The warming trend slows down until ca 13.5 ka cal BP, followed by arid conditions culminating around 12.8 ka cal BP. Our data suggest fairly warm conditions and the establishment of denser peat and forest vegetation ca 10.6 ka cal BP, contemporaneous with the onset of the Antarctic thermal optimum. This indicates large-scale shifts in the placement of zonal flow and the Westerlies at the beginning of the Holocene. |
format |
Dataset |
author |
Unkel, Ingmar Björck, Svante Wohlfarth, Barbara |
spellingShingle |
Unkel, Ingmar Björck, Svante Wohlfarth, Barbara Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego |
author_facet |
Unkel, Ingmar Björck, Svante Wohlfarth, Barbara |
author_sort |
Unkel, Ingmar |
title |
Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego |
title_short |
Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego |
title_full |
Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego |
title_fullStr |
Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego |
title_full_unstemmed |
Geochemistry of last glacial sediments of Isla de los Estados, southeastern Tierra del Fuego |
title_sort |
geochemistry of last glacial sediments of isla de los estados, southeastern tierra del fuego |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.802154 https://doi.org/10.1594/PANGAEA.802154 |
op_coverage |
MEDIAN LATITUDE: -54.751110 * MEDIAN LONGITUDE: -64.333135 * SOUTH-BOUND LATITUDE: -54.764250 * WEST-BOUND LONGITUDE: -64.339080 * NORTH-BOUND LATITUDE: -54.737970 * EAST-BOUND LONGITUDE: -64.327190 * DATE/TIME START: 2005-12-01T00:00:00 * DATE/TIME END: 2005-12-01T00:00:00 |
long_lat |
ENVELOPE(-64.339080,-64.327190,-54.737970,-54.764250) |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica permafrost Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctica permafrost Tierra del Fuego |
op_source |
Supplement to: Unkel, Ingmar; Björck, Svante; Wohlfarth, Barbara (2008): Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego. Quaternary Science Reviews, 27(15-16), 1541-1554, https://doi.org/10.1016/j.quascirev.2008.05.004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.802154 https://doi.org/10.1594/PANGAEA.802154 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.802154 https://doi.org/10.1016/j.quascirev.2008.05.004 |
_version_ |
1766164356019519488 |