Saavedra-Pellitero, M. et al. (2011): Coccolithophore estimates of paleotemperature and paleoproductivity changes in the Southeast Pacific over the past approximately 27 kyr
Leg/Site/Hole:
Related Expeditions:
ODP 202 ODP 202 1233
Identifier:
ID:
2013-009829
Type:
georefid
ID:
10.1029/2009PA001824
Type:
doi
Creator:
Name:
Saavedra-Pellitero, M.
Affiliation:
University of Salamanca, Department of Geology, Salamanca, Spain
Role:
author
Name:
Flores, J. A.
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, Germany
Role:
author
Name:
Lamy, F.
Affiliation:
Role:
author
Name:
Sierro, F. J.
Affiliation:
Role:
author
Name:
Cortina, A.
Affiliation:
Role:
author
Identification:
Title:
Coccolithophore estimates of paleotemperature and paleoproductivity changes in the Southeast Pacific over the past approximately 27 kyr
Year:
2011
Source:
Paleoceanography
Publisher:
American Geophysical Union, Washington, DC, United States
Volume:
26
Issue:
1
Pages:
Abstract:
We provide high-resolution sea surface temperature (SST) and paleoproductivity data focusing on Termination 1. We describe a new method for estimating SSTs based on multivariate statistical analyses performed on modern coccolithophore census data, and we present the first downcore reconstructions derived from coccolithophore assemblages at Ocean Drilling Project (ODP) Site 1233 located offshore Chile. We compare our coccolithophore SST record to alkenone-based SSTs as well as SST reconstructions based on dinoflagellates and radiolaria. All reconstructions generally show a remarkable concordance. As in the alkenone SST record, the Last Glacial Maximum (LGM, 19-23 kyr B.P.) is not clearly defined in our SST reconstruction. After the onset of deglaciation, three major warming steps are recorded: from 18.6 to 18 kyr B.P. ( approximately 2.6 degrees C), from 15.7 to 15.3 kyr B.P. ( approximately 2.5 degrees C), and from 13 to 11.4 kyr B.P. ( approximately 3.4 degrees C). Consistent with the other records from Site 1233 and Antarctic ice core records, we observed a clear Holocene Climatic Optimum (HCO) from approximately 8-12 kyr B.P. Combining the SST reconstruction with coccolith absolute abundances and accumulation rates, we show that colder temperatures during the LGM are linked to higher coccolithophore productivity offshore Chile and warmer SSTs during the HCO to lower coccolithophore productivity, with indications of weak coastal upwelling. We interpret our data in terms of latitudinal displacements of the Southern Westerlies and the northern margin of the Antarctic Circumpolar Current system over the deglaciation and the Holocene.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-41.0000 West:-74.2700 East:
-74.2700 South:-41.0000
Keywords: Quaternary geology; algae; alkenones; biostratigraphy; Cenozoic; Chile; Coccolithophoraceae; continental margin; cores; deglaciation; East Pacific; Foraminifera; Holocene; Invertebrata; ketones; Leg 202; marine sediments; microfossils; multivariate analysis; nannofossils; Ocean Drilling Program; ODP Site 1233; organic compounds; Pacific Ocean; paleo-oceanography; paleoclimatology; paleoenvironment; paleotemperature; Plantae; Pleistocene; principal components analysis; productivity; Protista; Quaternary; reconstruction; sea-surface temperature; sediments; South America; South Pacific; Southeast Pacific; statistical analysis; upper Pleistocene;
.