Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP)
Reconstructing precipitation and wind from the geological record could help researchers understand the potential changes in precipitation and wind dynamics in response to climate change in Peru. The last deglaciation offers natural experimental conditions to test the response of precipitation and wi...
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2022
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ftdoajarticles:oai:doaj.org/article:63d44563b00c453da496ae37c62e8b18 2023-05-15T17:36:47+02:00 Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP) M. Yseki B. Turcq S. Caquineau R. Salvatteci J. Solis C. G. Skilbeck F. Velazco D. Gutiérrez 2022-10-01T00:00:00Z https://doi.org/10.5194/cp-18-2255-2022 https://doaj.org/article/63d44563b00c453da496ae37c62e8b18 EN eng Copernicus Publications https://cp.copernicus.org/articles/18/2255/2022/cp-18-2255-2022.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-18-2255-2022 1814-9324 1814-9332 https://doaj.org/article/63d44563b00c453da496ae37c62e8b18 Climate of the Past, Vol 18, Pp 2255-2269 (2022) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2022 ftdoajarticles https://doi.org/10.5194/cp-18-2255-2022 2022-12-30T21:35:14Z Reconstructing precipitation and wind from the geological record could help researchers understand the potential changes in precipitation and wind dynamics in response to climate change in Peru. The last deglaciation offers natural experimental conditions to test the response of precipitation and wind dynamics to high-latitude forcing. While considerable research has been done to reconstruct precipitation variability during the last deglaciation in the Atlantic sector of South America, the Pacific sector of South America has received little attention. This work aims to fill this gap by reconstructing types of terrigenous transport to the central–southern Peruvian margin (12 and 14 ∘ S) during the last deglaciation (18–13 kyr BP). For this purpose, we used grain-size distribution in sediments of marine core M77/2-005-3 (Callao, 12 ∘ S) and core G14 (Pisco, 14 ∘ S). We analyzed end-members (EMs) to identify grain-size components and reconstruct potential sources and transport processes of terrigenous material across time. We identified four end-members for both Callao and Pisco sediments. In Callao, we propose that the changes in the contributions of EM4 (101 µm ) and EM2 (58 µm ) mainly reflect the hydrodynamic energy and diffuse sources, respectively, while the variations in EM3 (77 µm ) and EM1 (11 µm ) reflect changes in the eolian and fluvial inputs, respectively. In Pisco, where there are strong winds and an extensive coastal desert, changes in the contribution of EM1 (10 µm ) reflect changes in river inputs, while EM2 (52 µm ), EM3 (75 µm ), and EM4 (94 µm ) reflect an eolian origin. At millennial scale, our record shows an increase in the fluvial inputs during the last part of Heinrich Stadial 1 ( ∼16 –14.7 kyr BP) at both locations. This increase was linked to higher precipitation in the Andes related to a reduction of the Atlantic Meridional Overturning Circulation and meltwater discharge in the North Atlantic. In contrast, during the Bølling–Allerød interstadial ( ∼14.7 –13 kyr BP), there was an eolian ... Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Pacific Pisco ENVELOPE(-62.450,-62.450,-62.950,-62.950) Climate of the Past 18 10 2255 2269 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. Yseki B. Turcq S. Caquineau R. Salvatteci J. Solis C. G. Skilbeck F. Velazco D. Gutiérrez Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP) |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Reconstructing precipitation and wind from the geological record could help researchers understand the potential changes in precipitation and wind dynamics in response to climate change in Peru. The last deglaciation offers natural experimental conditions to test the response of precipitation and wind dynamics to high-latitude forcing. While considerable research has been done to reconstruct precipitation variability during the last deglaciation in the Atlantic sector of South America, the Pacific sector of South America has received little attention. This work aims to fill this gap by reconstructing types of terrigenous transport to the central–southern Peruvian margin (12 and 14 ∘ S) during the last deglaciation (18–13 kyr BP). For this purpose, we used grain-size distribution in sediments of marine core M77/2-005-3 (Callao, 12 ∘ S) and core G14 (Pisco, 14 ∘ S). We analyzed end-members (EMs) to identify grain-size components and reconstruct potential sources and transport processes of terrigenous material across time. We identified four end-members for both Callao and Pisco sediments. In Callao, we propose that the changes in the contributions of EM4 (101 µm ) and EM2 (58 µm ) mainly reflect the hydrodynamic energy and diffuse sources, respectively, while the variations in EM3 (77 µm ) and EM1 (11 µm ) reflect changes in the eolian and fluvial inputs, respectively. In Pisco, where there are strong winds and an extensive coastal desert, changes in the contribution of EM1 (10 µm ) reflect changes in river inputs, while EM2 (52 µm ), EM3 (75 µm ), and EM4 (94 µm ) reflect an eolian origin. At millennial scale, our record shows an increase in the fluvial inputs during the last part of Heinrich Stadial 1 ( ∼16 –14.7 kyr BP) at both locations. This increase was linked to higher precipitation in the Andes related to a reduction of the Atlantic Meridional Overturning Circulation and meltwater discharge in the North Atlantic. In contrast, during the Bølling–Allerød interstadial ( ∼14.7 –13 kyr BP), there was an eolian ... |
format |
Article in Journal/Newspaper |
author |
M. Yseki B. Turcq S. Caquineau R. Salvatteci J. Solis C. G. Skilbeck F. Velazco D. Gutiérrez |
author_facet |
M. Yseki B. Turcq S. Caquineau R. Salvatteci J. Solis C. G. Skilbeck F. Velazco D. Gutiérrez |
author_sort |
M. Yseki |
title |
Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP) |
title_short |
Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP) |
title_full |
Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP) |
title_fullStr |
Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP) |
title_full_unstemmed |
Millennial variability of terrigenous transport to the central–southern Peruvian margin during the last deglaciation (18–13 kyr BP) |
title_sort |
millennial variability of terrigenous transport to the central–southern peruvian margin during the last deglaciation (18–13 kyr bp) |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-2255-2022 https://doaj.org/article/63d44563b00c453da496ae37c62e8b18 |
long_lat |
ENVELOPE(-62.450,-62.450,-62.950,-62.950) |
geographic |
Pacific Pisco |
geographic_facet |
Pacific Pisco |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Climate of the Past, Vol 18, Pp 2255-2269 (2022) |
op_relation |
https://cp.copernicus.org/articles/18/2255/2022/cp-18-2255-2022.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-18-2255-2022 1814-9324 1814-9332 https://doaj.org/article/63d44563b00c453da496ae37c62e8b18 |
op_doi |
https://doi.org/10.5194/cp-18-2255-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
10 |
container_start_page |
2255 |
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2269 |
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1766136380790931456 |