Sr/Ca and δ18O in a fast-growing Diploria strigosa coral - evaluation of a new climate archive for the tropical Atlantic

Hetzinger, Steffen, Pfeiffer, Miriam, Dullo, Wolf-Christian, Ruprecht, Eberhard and Garbe-Schönberg, C.-Dieter (2006) Sr/Ca and δ18O in a fast-growing Diploria strigosa coral - evaluation of a new climate archive for the tropical Atlantic Geochemistry, Geophysics, Geosystems, 7 (10). Q10002. DOI 10.1029/2006GC001347.

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Abstract

This study provides the first monthly resolved, 41-year record of geochemical variations (δ18O and Sr/Ca) in a fast-growing Diploria strigosa brain coral from Guadeloupe, Caribbean Sea. Linear regression yields a significant correlation of coral Sr/Ca (δ18O) with instrumental sea surface temperature (SST) on both monthly and mean annual scales (e.g., r = −0.59 for correlation between Simple Ocean Data Assimilation (SODA) SST and Sr/Ca, and r = −0.66 for δ18O; mean annual scale, p < 0.0001). The generated coral Sr/Ca (δ18O)-SST calibration equations are consistent with each other and with published equations using other coral species from different regions. Moreover, a high correlation of coral Sr/Ca and δ18O with local air temperature on a mean annual scale (r = −0.78 for Sr/Ca; r = −0.73 for δ18O; p < 0.0001) demonstrates the applicability of geochemical proxies measured from Diploria strigosa corals as reliable recorders for interannual temperature variability. Both coral proxies are highly correlated with annual and seasonal mean time series of major SST indices in the northern tropical Atlantic (e.g., r = −0.71 for correlation between the index of North Tropical Atlantic SST anomaly and Sr/Ca, and r = −0.70 for δ18O; mean annual scale, p < 0.001). Furthermore, the coral proxies capture the impact of the El Niño–Southern Oscillation on the northern tropical Atlantic during boreal spring. Thus fast-growing Diploria strigosa corals are a promising new archive for the Atlantic Ocean.

Document Type: Article
Keywords: Paleoceanography; Meteorology; Oxygen isotopes, trace elements, proxy calibration, tropical Atlantic, El Niño
Research affiliation: Kiel University
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
DOI etc.: 10.1029/2006GC001347
ISSN: 1525-2027
Date Deposited: 03 Dec 2008 16:51
Last Modified: 07 Nov 2017 08:37
URI: http://eprints.uni-kiel.de/id/eprint/257

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