期刊
QUATERNARY RESEARCH
卷 85, 期 1, 页码 87-93出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1016/j.yqres.2015.12.002
关键词
Humboldt system; Reservoir age; Shell middens; Deglaciation; Radiocarbon; CO2
资金
- National Geographic Society [8122-06]
- U.S. National Science Foundation [NSF-ATM-0811382]
- Chilean FONDECYT [1140824]
- National Geographic Society [8122-06]
- U.S. National Science Foundation [NSF-ATM-0811382]
- Chilean FONDECYT [1140824]
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. (C) 2015 University of Washington. Published by Elsevier Inc. All rights reserved.
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