Variability of C-14 reservoir age and air-sea flux of CO2 in the Peru-Chile upwelling region during the past 12,000 years
Author
dc.contributor.author
Carre, Matthieu
Author
dc.contributor.author
Jackson Squella, Donald
Author
dc.contributor.author
Maldonado, Antonio
Author
dc.contributor.author
Chase, Brian
Author
dc.contributor.author
Sachs, Julian
Admission date
dc.date.accessioned
2016-06-28T22:37:25Z
Available date
dc.date.available
2016-06-28T22:37:25Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
Quaternary Research 85 (2016) 87–93
en_US
Identifier
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DOI: 10.1016/j.yqres.2015.12.002
Identifier
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https://repositorio.uchile.cl/handle/2250/139247
General note
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Artículo de publicación ISI
en_US
Abstract
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The variability of radiocarbon marine reservoir age through time and space limits the accuracy of chronologies in marine paleo-environmental archives. We report here new radiocarbon reservoir ages (Delta R) from the central coast of Chile (similar to 32 degrees S) for the Holocene period and compare these values to existing reservoir age reconstructions from southern Peru and northern Chile. Late Holocene Delta R values show little variability from central Chile to Peru. Prior to 6000 cal yr BP, however, Delta R values were markedly increased in southern Peru and northern Chile, while similar or slightly lower-than-modern Delta R values were observed in central Chile. This extended dataset suggests that the early Holocene was characterized by a substantial increase in the latitudinal gradient of marine reservoir age between central and northern Chile. This change in the marine reservoir ages indicates that the early Holocene air-sea flux of CO2 could have been up to five times more intense than in the late Holocene in the Peruvian upwelling, while slightly reduced in central Chile. Our results show that oceanic circulation changes in the Humboldt system during the Holocene have substantially modified the air-sea carbon flux in this region.
en_US
Patrocinador
dc.description.sponsorship
National Geographic Society
8122-06;
U.S. National Science Foundation
NSF-ATM-0811382
Chilean; FONDECYT
1140824