High Pacific native Kilbourne

Core/Site name:

Malo Channel

Country/Region:

Espiritu Santo Island, Vanuatu

Elevation:

-1

Archive:

corals

Species:

Porites lutea

Proxy measurement:

Sr/Ca, Mg/Ca, d18O, d13C

Sampling resolution:

monthly

Startyear:

1928 AD

Endyear:

1992 AD

Description:

Coral skeletal geochemistry offers the potential to reconstruct the sea surface salinity (SSS) history of the tropical oceans on seasonal to interannual and perhaps centennial timescales because of the strong link between variation in SSS and seawater δ18O in tropical regions. We explore this potential using a monthly resolved, 65-year record of skeletal δ18O and Sr/Ca variations in a Porites coral from Espiritu Santo, Vanuatu. We demonstrate that El Niño–Southern Oscillation–related climate variability strongly influences coral δ18O at Santo through local salinity changes associated with the position of the South Pacific Convergence Zone and the movement of its associated salinity front. Such a demonstration provides the “ground truth” data that can be used to place paleoclimate variability estimated using existing fossil coral records from this region into a modern conceptual framework. We also evaluate different methods of combining coral δ18O and Sr/Ca to reconstruct SSS and conclude that the coral δ18O anomaly time series provides the best fit to recent in situ SSS data at Santo.

Data entered by name:

Paniagua, Juan F.

Data entered by email:

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Main reference(s):

Kilbourne, K.H., T.M. Quinn, F.W. Taylor, T. Delcroix, and Y. Gouriou. 2004. El Nino-Southern Oscillation-related salinity variations recorded in the skeletal geochemistry of a Porites coral from Espiritu Santo, Vanuatu. Paleoceanography, Vol. 19, No. 4, PA4002, doi: 10.1029/2004PA001033

Link to reference 1:

http://www.agu.org/pubs/crossref/2004/2004PA001033.shtml

Data storage link 1:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:827484176730699::::P1_STUDY_ID:1925

Data storage link 2:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/malo-channel2004.txt

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k