Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia
The causes underlying Holocene glacier fluctuations remain elusive, despite decades of research efforts. Cosmogenic nuclide dating has allowed systematic study and thus improved knowledge of glacier-climate dynamics during this time frame, in part by filling in geographical gaps in both hemispheres....
Published in: | Frontiers in Earth Science |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Frontiers Media SA
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.3389/feart.2021.813433 https://www.frontiersin.org/articles/10.3389/feart.2021.813433/full |
id |
crfrontiers:10.3389/feart.2021.813433 |
---|---|
record_format |
openpolar |
spelling |
crfrontiers:10.3389/feart.2021.813433 2024-05-19T07:32:12+00:00 Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia Sagredo, Esteban A. Reynhout, Scott A. Kaplan, Michael R. Aravena, Juan C. Araya, Paola S. Luckman, Brian H. Schwartz, Roseanne Schaefer, Joerg M. Fondo Nacional de Desarrollo Científico y Tecnológico Agencia Nacional de Investigación y Desarrollo National Science Foundation 2021 http://dx.doi.org/10.3389/feart.2021.813433 https://www.frontiersin.org/articles/10.3389/feart.2021.813433/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 9 ISSN 2296-6463 journal-article 2021 crfrontiers https://doi.org/10.3389/feart.2021.813433 2024-05-01T06:49:34Z The causes underlying Holocene glacier fluctuations remain elusive, despite decades of research efforts. Cosmogenic nuclide dating has allowed systematic study and thus improved knowledge of glacier-climate dynamics during this time frame, in part by filling in geographical gaps in both hemispheres. Here we present a new comprehensive Holocene moraine chronology from Mt. San Lorenzo (47°S) in central Patagonia, Southern Hemisphere. Twenty-four new 10 Be ages, together with three published ages, indicate that the Río Tranquilo glacier approached its Holocene maximum position sometime, or possibly on multiple occasions, between 9,860 ± 180 and 6,730 ± 130 years. This event(s) was followed by a sequence of slightly smaller advances at 5,750 ± 220, 4,290 ± 100 (?), 3,490 ± 140, 1,440 ± 60, between 670 ± 20 and 430 ± 20, and at 390 ± 10 years ago. The Tranquilo record documents centennial to millennial-scale glacier advances throughout the Holocene, and is consistent with recent glacier chronologies from central and southern Patagonia. This pattern correlates well with that of multiple moraine-building events with slightly decreasing net extent, as is observed at other sites in the Southern Hemisphere (i.e., Patagonia, New Zealand and Antarctic Peninsula) throughout the early, middle and late Holocene. This is in stark contrast to the typical Holocene mountain glacier pattern in the Northern Hemisphere, as documented in the European Alps, Scandinavia and Canada, where small glaciers in the early-to-mid Holocene gave way to more-extensive glacier advances during the late Holocene, culminating in the Little Ice Age expansion. We posit that this past asymmetry between the Southern and Northern hemisphere glacier patterns is due to natural forcing that has been recently overwhelmed by anthropogenic greenhouse gas driven warming, which is causing interhemispherically synchronized glacier retreat unprecedented during the Holocene. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula glacier* Frontiers (Publisher) Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
Frontiers (Publisher) |
op_collection_id |
crfrontiers |
language |
unknown |
description |
The causes underlying Holocene glacier fluctuations remain elusive, despite decades of research efforts. Cosmogenic nuclide dating has allowed systematic study and thus improved knowledge of glacier-climate dynamics during this time frame, in part by filling in geographical gaps in both hemispheres. Here we present a new comprehensive Holocene moraine chronology from Mt. San Lorenzo (47°S) in central Patagonia, Southern Hemisphere. Twenty-four new 10 Be ages, together with three published ages, indicate that the Río Tranquilo glacier approached its Holocene maximum position sometime, or possibly on multiple occasions, between 9,860 ± 180 and 6,730 ± 130 years. This event(s) was followed by a sequence of slightly smaller advances at 5,750 ± 220, 4,290 ± 100 (?), 3,490 ± 140, 1,440 ± 60, between 670 ± 20 and 430 ± 20, and at 390 ± 10 years ago. The Tranquilo record documents centennial to millennial-scale glacier advances throughout the Holocene, and is consistent with recent glacier chronologies from central and southern Patagonia. This pattern correlates well with that of multiple moraine-building events with slightly decreasing net extent, as is observed at other sites in the Southern Hemisphere (i.e., Patagonia, New Zealand and Antarctic Peninsula) throughout the early, middle and late Holocene. This is in stark contrast to the typical Holocene mountain glacier pattern in the Northern Hemisphere, as documented in the European Alps, Scandinavia and Canada, where small glaciers in the early-to-mid Holocene gave way to more-extensive glacier advances during the late Holocene, culminating in the Little Ice Age expansion. We posit that this past asymmetry between the Southern and Northern hemisphere glacier patterns is due to natural forcing that has been recently overwhelmed by anthropogenic greenhouse gas driven warming, which is causing interhemispherically synchronized glacier retreat unprecedented during the Holocene. |
author2 |
Fondo Nacional de Desarrollo Científico y Tecnológico Agencia Nacional de Investigación y Desarrollo National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Sagredo, Esteban A. Reynhout, Scott A. Kaplan, Michael R. Aravena, Juan C. Araya, Paola S. Luckman, Brian H. Schwartz, Roseanne Schaefer, Joerg M. |
spellingShingle |
Sagredo, Esteban A. Reynhout, Scott A. Kaplan, Michael R. Aravena, Juan C. Araya, Paola S. Luckman, Brian H. Schwartz, Roseanne Schaefer, Joerg M. Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia |
author_facet |
Sagredo, Esteban A. Reynhout, Scott A. Kaplan, Michael R. Aravena, Juan C. Araya, Paola S. Luckman, Brian H. Schwartz, Roseanne Schaefer, Joerg M. |
author_sort |
Sagredo, Esteban A. |
title |
Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia |
title_short |
Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia |
title_full |
Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia |
title_fullStr |
Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia |
title_full_unstemmed |
Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47�S), Central Patagonia |
title_sort |
holocene history of río tranquilo glacier, monte san lorenzo (47�s), central patagonia |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/feart.2021.813433 https://www.frontiersin.org/articles/10.3389/feart.2021.813433/full |
genre |
Antarc* Antarctic Antarctic Peninsula glacier* |
genre_facet |
Antarc* Antarctic Antarctic Peninsula glacier* |
op_source |
Frontiers in Earth Science volume 9 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2021.813433 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1799470188510314496 |