high Pacific native Nurhati

Core/Site name:

Palmyra Island,Fanning Island,Kiritimati Island

Country/Region:

Central tropical Pacific

Elevation:

-9

Archive:

corals

Species:

Porites sp.

Proxy measurement:

18O, Sr/Ca

Sampling resolution:

monthly

Startyear:

1972 AD

Endyear:

2005 AD

Description:

Global climate models and analyses of instrumentaldatasets provide a wide range of scenarios for future tropical Pacific climate change, limiting the accuracy of regional climate projections. Coral records provide continuous reconstructions of tropical Pacific climate trends that are difficult to quantify using the short, sparse instrumentaldatasets available from the tropical Pacific. Here, we present coral-based reconstructions of late 20th century sea-surface temperature and salinity trends from several islands in the central tropical Pacific. The coral data reveal warming trends that increase towards the equator, implying a decrease in equatorial upwelling in the last decades. Seawater freshening trends on the southern edge of the Inter-Tropical Convergence Zone suggest a strengthening and/or an equatorward shift of the convergence zone. Together, the new coral records support a late 20th century trend towards ‘‘El Nin˜o-like’’ conditions in the tropical Pacific, in line with the majority of coupled global climatemodel projections.

Data entered by name:

Filipsson, Helena

Data entered by email:

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Main reference(s):

Nurhati, I.S., K.M. Cobb, C.D. Charles, and R.B. Dunbar. 2009. Late 20th century warming and freshening in the central tropical Pacific. Geophys. Res. Lett., 36, L21606

Link to reference 1:

http://shadow.eas.gatech.edu/~kcobb/nurhati09.pdf

Link to reference 2:

http://www.agu.org/pubs/crossref/2009/2009GL040270.shtml

Data storage link 1:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:4354650239631988::::P1_STUDY_ID:8609

Comments:

Core locations: Palmyra: 5°53'N, 162° 5'W, 9m depthFanning: 3°51'N, 159°21'W, 11m depthChristmas: 1°52'N, 157°24'W, 9m depth

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k