High Pacific native Nurhati

Core/Site name:

Palmyra Island

Country/Region:

Republic of Kiribati

Elevation:

9

Area:

-0

Archive:

corals

Species:

Porites sp.

Proxy measurement:

Sr/Ca, d18O

Sampling resolution:

monthly

Climate sensitivity:

temperature, hydrology

Dating resolution:

annual

Dating information:

absolute

Startyear:

1998

Endyear:

1886

Description:

This dataset contains coral-derived sea-surface temperature (SST, via Sr/Ca) and salinity (SSS, via the oxygen isotopic composition of seawater or d18Osw) reconstructions from Palmyra Island of the Line Islands chain in the central tropical Pacific, for the period 1886-1998. Cobb et al. [2001] presented the century-long coral oxygen isotopic (d18O) record from Palmyra, and here we present the century-long Sr/Ca and d18Osw records from Palmyra. The late 20th century portion of the Sr/Ca and d18Osw records was presented in Nurhati et al.[2009]. We measured coral d18O values on a GV Isoprime-Multiprep mass spectrometer with an analytical precision of ± 0.05‰ (1sigma), and Sr/Ca ratios with a Jobin Yvon Ultima 2C Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES) with an analytical precision of ± 0.07% or ± 0.006 mmol/mol(1s) using the nearest-neighbor correction method from Schrag [1999]. We used the monthly 1ºx1º IGOSS SST dataset [Reynolds et al., 2002] to calibrate Sr/Ca ratios via reduced major axis regression, where (SST)palm = 130.43 – 11.39 x (Sr/Ca)palm (Nov 1981-Mar 1998; R=-0.71; CI > 99%). We derive the oxygen isotopic composition of seawater (d18Osw) by subtracting the Sr/Ca-derived SST contribution from coral d18O following the method outlined in Ren et al. [2003]. Fairbanks et al. [1997] find an empirical linear relationship between d18Osw and SSS in the central tropical Pacific, so we use the d18Osw records to reconstruct SSS variability associated with changes in the hydrological balance.

Data entered by name:

Casey Saenger

Data entered by email:

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Main reference(s):

Nurhati, I.S., K.M. Cobb, and E. Di Lorenzo. 2011. Decadal-scale SST nd Salinity Variations in the Central Tropical Pacific: Signatures of Natural and Anthropogenic Climate Change. Journal of Climate, Vol. 24, Issue 13, pp. 3294-3308, July 2011. doi: 10.1175/2011JCLI3852.1

Link to reference 1:

http://journals.ametsoc.org/doi/abs/10.1175/2011JCLI3852.1

Link to reference 2:

http://shadow.eas.gatech.edu/%7Ekcobb/pubs/nurhati11.pdf

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/palmyra2011.txt

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k