Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems
Patagonia is ideally situated to reconstruct past migrations of the southern westerly winds (SWWs) due to its southerly maritime location. The SWWs are an important driver of Southern Ocean upwelling and their strength and latitudinal position changed during the Holocene, leading thus to different r...
Published in: | Global and Planetary Change |
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Language: | English |
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2023
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/51387/ https://doi.org/10.1016/j.gloplacha.2023.104050 https://nrl.northumbria.ac.uk/id/eprint/51387/1/Nehme_2023_GPC_accepted_pre-proof.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:51387 2023-05-15T13:51:03+02:00 Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems Nehme, C. Todisco, D. Breitenbach, Sebastian Couchoud, I. Marchegiano, M. Peral, M. Vonhof, H. Hellstrom, J. Tjallingii, R. Claeys, P. Borrero, L. Martin, F. 2023-03-01 text https://nrl.northumbria.ac.uk/id/eprint/51387/ https://doi.org/10.1016/j.gloplacha.2023.104050 https://nrl.northumbria.ac.uk/id/eprint/51387/1/Nehme_2023_GPC_accepted_pre-proof.pdf en eng Elsevier https://nrl.northumbria.ac.uk/id/eprint/51387/1/Nehme_2023_GPC_accepted_pre-proof.pdf Nehme, C., Todisco, D., Breitenbach, Sebastian, Couchoud, I., Marchegiano, M., Peral, M., Vonhof, H., Hellstrom, J., Tjallingii, R., Claeys, P., Borrero, L. and Martin, F. (2023) Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems. Global and Planetary Change, 222. p. 104050. ISSN 0921-8181 cc_by_nc_nd_4_0 CC-BY-NC-ND F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2023 ftunivnorthumb https://doi.org/10.1016/j.gloplacha.2023.104050 2023-02-16T23:31:26Z Patagonia is ideally situated to reconstruct past migrations of the southern westerly winds (SWWs) due to its southerly maritime location. The SWWs are an important driver of Southern Ocean upwelling and their strength and latitudinal position changed during the Holocene, leading thus to different responses of the vegetation to past climate changes along the Chilean continental margin. A new speleothem record from Cueva Chica (51°S) is investigated to reconstruct past climatic changes throughout the Holocene in conjunction with other marine and paleoenvironmental records of the region and better constrain the regional paleoclimatic evolutions of SWWs. Samples comprising both a flowstone core and a stalagmite were radiometrically dated (UTh & 14C) to construct age-depth models for the highly-resolved proxy profiles (δ13C, δ18O, chemical composition). The Cueva Chica record provides a highly-resolved isotopic and elemental curves for the last 12 ka, albeit with a hiatus from 5.8 to 4 ka BP. The multi-proxy analysis suggests three climatic regimes throughout the Holocene in Southern Patagonia: i) an early Holocene wet period (with the exception of two dry excursions at 10.5 ka and 8.5 ka BP), ii) a mid-Holocene dry period and iii), a return to generally wet conditions over the late Holocene. The global drivers for these tri-phased climatic regimes are likely related to oceanic and South polar feedbacks. The early Holocene was the warmest period and might be attributable to changes in global ocean circulation which involved a rise in air T° and a strength in SWW from 50°S, and therefore higher precipitations over landmass. After 9 ka BP, an intensified deglaciation dynamic along the Antarctic Peninsula is concordant with increasing summer insolation in the Southern hemisphere, leading to a poleward shift of the SWWs in response to global warming and thus to a reduction in moisture supply from the Pacific onto the Patagonian shore. After 5 ka BP, a gradual SST decline is consistent with an equatorward ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Northumbria University, Newcastle: Northumbria Research Link (NRL) Antarctic Antarctic Peninsula Chica ENVELOPE(-57.050,-57.050,-63.350,-63.350) Cueva ENVELOPE(-62.600,-62.600,-64.150,-64.150) Pacific Patagonia Southern Ocean The Antarctic Global and Planetary Change 222 104050 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Nehme, C. Todisco, D. Breitenbach, Sebastian Couchoud, I. Marchegiano, M. Peral, M. Vonhof, H. Hellstrom, J. Tjallingii, R. Claeys, P. Borrero, L. Martin, F. Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Patagonia is ideally situated to reconstruct past migrations of the southern westerly winds (SWWs) due to its southerly maritime location. The SWWs are an important driver of Southern Ocean upwelling and their strength and latitudinal position changed during the Holocene, leading thus to different responses of the vegetation to past climate changes along the Chilean continental margin. A new speleothem record from Cueva Chica (51°S) is investigated to reconstruct past climatic changes throughout the Holocene in conjunction with other marine and paleoenvironmental records of the region and better constrain the regional paleoclimatic evolutions of SWWs. Samples comprising both a flowstone core and a stalagmite were radiometrically dated (UTh & 14C) to construct age-depth models for the highly-resolved proxy profiles (δ13C, δ18O, chemical composition). The Cueva Chica record provides a highly-resolved isotopic and elemental curves for the last 12 ka, albeit with a hiatus from 5.8 to 4 ka BP. The multi-proxy analysis suggests three climatic regimes throughout the Holocene in Southern Patagonia: i) an early Holocene wet period (with the exception of two dry excursions at 10.5 ka and 8.5 ka BP), ii) a mid-Holocene dry period and iii), a return to generally wet conditions over the late Holocene. The global drivers for these tri-phased climatic regimes are likely related to oceanic and South polar feedbacks. The early Holocene was the warmest period and might be attributable to changes in global ocean circulation which involved a rise in air T° and a strength in SWW from 50°S, and therefore higher precipitations over landmass. After 9 ka BP, an intensified deglaciation dynamic along the Antarctic Peninsula is concordant with increasing summer insolation in the Southern hemisphere, leading to a poleward shift of the SWWs in response to global warming and thus to a reduction in moisture supply from the Pacific onto the Patagonian shore. After 5 ka BP, a gradual SST decline is consistent with an equatorward ... |
format |
Article in Journal/Newspaper |
author |
Nehme, C. Todisco, D. Breitenbach, Sebastian Couchoud, I. Marchegiano, M. Peral, M. Vonhof, H. Hellstrom, J. Tjallingii, R. Claeys, P. Borrero, L. Martin, F. |
author_facet |
Nehme, C. Todisco, D. Breitenbach, Sebastian Couchoud, I. Marchegiano, M. Peral, M. Vonhof, H. Hellstrom, J. Tjallingii, R. Claeys, P. Borrero, L. Martin, F. |
author_sort |
Nehme, C. |
title |
Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems |
title_short |
Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems |
title_full |
Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems |
title_fullStr |
Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems |
title_full_unstemmed |
Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems |
title_sort |
holocene hydroclimate variability along the southern patagonian margin (chile) reconstructed from cueva chica speleothems |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://nrl.northumbria.ac.uk/id/eprint/51387/ https://doi.org/10.1016/j.gloplacha.2023.104050 https://nrl.northumbria.ac.uk/id/eprint/51387/1/Nehme_2023_GPC_accepted_pre-proof.pdf |
long_lat |
ENVELOPE(-57.050,-57.050,-63.350,-63.350) ENVELOPE(-62.600,-62.600,-64.150,-64.150) |
geographic |
Antarctic Antarctic Peninsula Chica Cueva Pacific Patagonia Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Chica Cueva Pacific Patagonia Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/51387/1/Nehme_2023_GPC_accepted_pre-proof.pdf Nehme, C., Todisco, D., Breitenbach, Sebastian, Couchoud, I., Marchegiano, M., Peral, M., Vonhof, H., Hellstrom, J., Tjallingii, R., Claeys, P., Borrero, L. and Martin, F. (2023) Holocene hydroclimate variability along the Southern Patagonian margin (Chile) reconstructed from Cueva Chica speleothems. Global and Planetary Change, 222. p. 104050. ISSN 0921-8181 |
op_rights |
cc_by_nc_nd_4_0 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.gloplacha.2023.104050 |
container_title |
Global and Planetary Change |
container_volume |
222 |
container_start_page |
104050 |
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1766254630261489664 |