Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile
ABSTRACT A Holocene paleoclimate record was constructed using two lacustrine cores from the high‐elevation Chilean Andes at ∼30°S latitude. Coarser and more poorly sorted grain‐size distributions and higher C/N ratios were interpreted as evidence for increased storm activity. Wet conditions prevaile...
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crwiley:10.1002/jqs.3012 2024-06-23T07:55:11+00:00 Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile Tiner, Rachel J. Negrini, Robert M. Antinao, Jose L. McDonald, Eric Maldonado, Antonio National Stroke Foundation 2018 http://dx.doi.org/10.1002/jqs.3012 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3012 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3012 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 33, issue 2, page 150-165 ISSN 0267-8179 1099-1417 journal-article 2018 crwiley https://doi.org/10.1002/jqs.3012 2024-06-13T04:22:14Z ABSTRACT A Holocene paleoclimate record was constructed using two lacustrine cores from the high‐elevation Chilean Andes at ∼30°S latitude. Coarser and more poorly sorted grain‐size distributions and higher C/N ratios were interpreted as evidence for increased storm activity. Wet conditions prevailed from ∼10.8 to 9.5k cal a BP, then transitioned to dry conditions from ∼9.5 to 5.7k cal a BP interrupted by stormy conditions from ∼8.3 to 7.6k cal a BP. Wet conditions returned from ∼5.7k cal a BP to the present, interrupted by aridity from ∼4.1 to 2.2k cal a BP. This paleoclimate record is consistent with others from the region. The wet periods were probably caused by the influence of the Southern Westerlies, while dry conditions resulted from the influence of the Southeast Pacific Anticyclone. The increased storminess from ∼8.3 to 7.7k cal a BP may have been sourced from latitudinal shifts in the Intertropical Convergence Zone and subsequent weakening of the Westerlies, allowing the incursion of convective storms from east of the Andes. This sequence of events is consistent with synoptic conditions during modern easterly sourced storm activity. It is also consistent with modeling studies of the effect on the Southern Hemisphere of the rapid cooling of the North Atlantic Ocean during the 8.2‐ka event. Article in Journal/Newspaper North Atlantic Wiley Online Library Pacific Journal of Quaternary Science 33 2 150 165 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT A Holocene paleoclimate record was constructed using two lacustrine cores from the high‐elevation Chilean Andes at ∼30°S latitude. Coarser and more poorly sorted grain‐size distributions and higher C/N ratios were interpreted as evidence for increased storm activity. Wet conditions prevailed from ∼10.8 to 9.5k cal a BP, then transitioned to dry conditions from ∼9.5 to 5.7k cal a BP interrupted by stormy conditions from ∼8.3 to 7.6k cal a BP. Wet conditions returned from ∼5.7k cal a BP to the present, interrupted by aridity from ∼4.1 to 2.2k cal a BP. This paleoclimate record is consistent with others from the region. The wet periods were probably caused by the influence of the Southern Westerlies, while dry conditions resulted from the influence of the Southeast Pacific Anticyclone. The increased storminess from ∼8.3 to 7.7k cal a BP may have been sourced from latitudinal shifts in the Intertropical Convergence Zone and subsequent weakening of the Westerlies, allowing the incursion of convective storms from east of the Andes. This sequence of events is consistent with synoptic conditions during modern easterly sourced storm activity. It is also consistent with modeling studies of the effect on the Southern Hemisphere of the rapid cooling of the North Atlantic Ocean during the 8.2‐ka event. |
author2 |
National Stroke Foundation |
format |
Article in Journal/Newspaper |
author |
Tiner, Rachel J. Negrini, Robert M. Antinao, Jose L. McDonald, Eric Maldonado, Antonio |
spellingShingle |
Tiner, Rachel J. Negrini, Robert M. Antinao, Jose L. McDonald, Eric Maldonado, Antonio Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile |
author_facet |
Tiner, Rachel J. Negrini, Robert M. Antinao, Jose L. McDonald, Eric Maldonado, Antonio |
author_sort |
Tiner, Rachel J. |
title |
Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile |
title_short |
Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile |
title_full |
Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile |
title_fullStr |
Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile |
title_full_unstemmed |
Geophysical and geochemical constraints on the age and paleoclimate implications of Holocene lacustrine cores from the Andes of central Chile |
title_sort |
geophysical and geochemical constraints on the age and paleoclimate implications of holocene lacustrine cores from the andes of central chile |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/jqs.3012 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3012 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3012 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Quaternary Science volume 33, issue 2, page 150-165 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3012 |
container_title |
Journal of Quaternary Science |
container_volume |
33 |
container_issue |
2 |
container_start_page |
150 |
op_container_end_page |
165 |
_version_ |
1802647646338285568 |