Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt
Isla de los Estados (54° 45′S, 63° 10′–64° 46′W) lies east of the main island of Tierra del Fuego and is the southeastern-most point in Argentina. Because of its geographic position near the latitudes of the Southern Hemisphere Westerlies and the strong influence of the Antarctic Circumpolar Current...
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ftconicet:oai:ri.conicet.gov.ar:11336/26739 2023-10-09T21:45:43+02:00 Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt Fernández, Marilén Björck, Svante Wohlfarth, Barbaria Maidana, Nora Irene Unkel, Ingmar Van der Putten, Nathalie application/pdf http://hdl.handle.net/11336/26739 eng eng Springer info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10933-013-9736-4 info:eu-repo/semantics/altIdentifier/doi/10.1007/s10933-013-9736-4 http://hdl.handle.net/11336/26739 Fernández, Marilén; Björck, Svante; Wohlfarth, Barbaria; Maidana, Nora Irene; Unkel, Ingmar; et al.; Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt; Springer; Journal Of Paleolimnology; 50; 4; 6-2013; 433-446 0921-2728 1573-0417 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ Diatoms Biogenic Silica Isla de Los Estados Late Glacial-Early Holocene Paleoenvironments https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1007/s10933-013-9736-4 2023-09-24T19:35:38Z Isla de los Estados (54° 45′S, 63° 10′–64° 46′W) lies east of the main island of Tierra del Fuego and is the southeastern-most point in Argentina. Because of its geographic position near the latitudes of the Southern Hemisphere Westerlies and the strong influence of the Antarctic Circumpolar Current (ACC), the area is suitable for paleoecological and paleoclimate research. The island is not far north of the Subantarctic Front, which limits the northern boundary of the ACC. Paleoenvironmental study in this geographic location can shed light on past changes in atmospheric and marine circulation patterns. Diatom analysis of the lower part of a sediment sequence from Laguna Cascada (54° 45′ 51.3′′S, 64° 20′ 20.07′′W) enabled inference of changing lake conditions between 16 and 11.1 cal ka BP. Between 16 and 14.4 cal ka BP fragilarioid diatom species, often a pioneer group, dominated the record. Their presence shows seasonally open-water conditions from the onset of sedimentation. In zone II (14.4–12.8 cal ka BP), the dominance of planktonic/tychoplanktonic Aulacoseira spp. might represent longer ice-free periods and windier conditions, which would have kept this heavy species suspended in the water column. This period corresponds to the Antarctic Cold Reversal, when the Southern Hemisphere Westerlies were possibly centered on the latitudes of Tierra del Fuego, resulting in windy and wet conditions. Zone III (12.8–11.1 cal ka BP) is dominated by benthic diatom taxa that are mainly associated with peat and wetland vegetation. This suggests that climate conditions had become milder and less windy, favoring aquatic productivity and terrestrial vegetation development. This change in environmental conditions may have been a consequence of the southward movement of the Southern Hemisphere Westerlies at the start of the Antarctic Holocene thermal optimum. Fil: Fernández, Marilén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Björck, Svante. Lund ... Article in Journal/Newspaper Antarc* Antarctic Tierra del Fuego CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic The Antarctic Austral Argentina Main Island ENVELOPE(-38.220,-38.220,-54.007,-54.007) Changing Lake ENVELOPE(-45.619,-45.619,-60.708,-60.708) Journal of Paleolimnology 50 4 433 446 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Diatoms Biogenic Silica Isla de Los Estados Late Glacial-Early Holocene Paleoenvironments https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Diatoms Biogenic Silica Isla de Los Estados Late Glacial-Early Holocene Paleoenvironments https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Fernández, Marilén Björck, Svante Wohlfarth, Barbaria Maidana, Nora Irene Unkel, Ingmar Van der Putten, Nathalie Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt |
topic_facet |
Diatoms Biogenic Silica Isla de Los Estados Late Glacial-Early Holocene Paleoenvironments https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
Isla de los Estados (54° 45′S, 63° 10′–64° 46′W) lies east of the main island of Tierra del Fuego and is the southeastern-most point in Argentina. Because of its geographic position near the latitudes of the Southern Hemisphere Westerlies and the strong influence of the Antarctic Circumpolar Current (ACC), the area is suitable for paleoecological and paleoclimate research. The island is not far north of the Subantarctic Front, which limits the northern boundary of the ACC. Paleoenvironmental study in this geographic location can shed light on past changes in atmospheric and marine circulation patterns. Diatom analysis of the lower part of a sediment sequence from Laguna Cascada (54° 45′ 51.3′′S, 64° 20′ 20.07′′W) enabled inference of changing lake conditions between 16 and 11.1 cal ka BP. Between 16 and 14.4 cal ka BP fragilarioid diatom species, often a pioneer group, dominated the record. Their presence shows seasonally open-water conditions from the onset of sedimentation. In zone II (14.4–12.8 cal ka BP), the dominance of planktonic/tychoplanktonic Aulacoseira spp. might represent longer ice-free periods and windier conditions, which would have kept this heavy species suspended in the water column. This period corresponds to the Antarctic Cold Reversal, when the Southern Hemisphere Westerlies were possibly centered on the latitudes of Tierra del Fuego, resulting in windy and wet conditions. Zone III (12.8–11.1 cal ka BP) is dominated by benthic diatom taxa that are mainly associated with peat and wetland vegetation. This suggests that climate conditions had become milder and less windy, favoring aquatic productivity and terrestrial vegetation development. This change in environmental conditions may have been a consequence of the southward movement of the Southern Hemisphere Westerlies at the start of the Antarctic Holocene thermal optimum. Fil: Fernández, Marilén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Björck, Svante. Lund ... |
format |
Article in Journal/Newspaper |
author |
Fernández, Marilén Björck, Svante Wohlfarth, Barbaria Maidana, Nora Irene Unkel, Ingmar Van der Putten, Nathalie |
author_facet |
Fernández, Marilén Björck, Svante Wohlfarth, Barbaria Maidana, Nora Irene Unkel, Ingmar Van der Putten, Nathalie |
author_sort |
Fernández, Marilén |
title |
Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt |
title_short |
Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt |
title_full |
Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt |
title_fullStr |
Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt |
title_full_unstemmed |
Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt |
title_sort |
diatom assemblage changes in lacustrine sediments from isla de los estados, southernmost south america, in response to shifts in the southwesterly wind belt |
publisher |
Springer |
url |
http://hdl.handle.net/11336/26739 |
long_lat |
ENVELOPE(-38.220,-38.220,-54.007,-54.007) ENVELOPE(-45.619,-45.619,-60.708,-60.708) |
geographic |
Antarctic The Antarctic Austral Argentina Main Island Changing Lake |
geographic_facet |
Antarctic The Antarctic Austral Argentina Main Island Changing Lake |
genre |
Antarc* Antarctic Tierra del Fuego |
genre_facet |
Antarc* Antarctic Tierra del Fuego |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10933-013-9736-4 info:eu-repo/semantics/altIdentifier/doi/10.1007/s10933-013-9736-4 http://hdl.handle.net/11336/26739 Fernández, Marilén; Björck, Svante; Wohlfarth, Barbaria; Maidana, Nora Irene; Unkel, Ingmar; et al.; Diatom assemblage changes in lacustrine sediments from Isla de los Estados, southernmost South America, in response to shifts in the southwesterly wind belt; Springer; Journal Of Paleolimnology; 50; 4; 6-2013; 433-446 0921-2728 1573-0417 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
op_doi |
https://doi.org/10.1007/s10933-013-9736-4 |
container_title |
Journal of Paleolimnology |
container_volume |
50 |
container_issue |
4 |
container_start_page |
433 |
op_container_end_page |
446 |
_version_ |
1779321117507321856 |