High Pacific native Asami

Core/Site name:

Double Reef

Country/Region:

Guam

Elevation:

-7.8

Archive:

corals

Species:

Porites lobata

Proxy measurement:

d18O

Sampling resolution:

monthly

Climate sensitivity:

salinity temperature

Dating resolution:

subannual banding

Dating information:

absolute

Startyear:

1790 AD

Endyear:

2000 AD

All uncertainties:

0.03 per mil for d18O measurements

Description:

We present a monthly resolved, 213-year stable isotope time series from a coral from Guam (13N, 145E), which is located on the northern edge of the western Pacific warm pool. Oxygen isotopic composition of the coral skeleton (d18Ocoral) shows seasonal, interannual, and decadal variability, which documents significant oceanographic changes related to thermal and hydrologic variations in this region. The d18Ocoral anomaly reflects sea surface temperature (SST) anomaly and sea surface salinity (SSS) anomaly with significant r values of -0.69 and 0.49, respectively, which are strongly linked to oceanographic changes that occur during El Nino–Southern Oscillation (ENSO) warm and cool phases. We identified 46 ENSO warm (El Nino) and 53 cool phases (La Nina) in the coral record, which are consistent with those phases reconstructed by Nino 3.4 SST anomaly. Spectral analyses of the d18O(coral) anomaly record for the years 1790–1999 identified significant peaks around ~3 to ~7 years. These results indicate that the Guam coral has recorded ENSO periodicity. The d18Ocoral anomaly shows decadal variability of ~15- to ~45-year periodicity with significant shifts (

Data entered by name:

Jessica Tierney

Data entered by email:

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Main reference(s):

Asami, R., T. Yamada, Y. Iryu, T.M. Quinn, C.P. Meyer, and G. Paulay. 2005. Interannual and decadal variability of the western Pacific sea surface condition for the years 1787-2000: Reconstruction based on stable isotope record from a Guam coral. Journal Geophysical Research, 110, C05018, doi:10.1029/2004JC002555.

Link to reference 1:

http://www.agu.org/journals/jc/jc0505/2004JC002555/

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/west_pacific/guam2005.txt

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k