Low Atlantic Native Lea

Core/Site name:

PL07-39PC

Country/Region:

Cariaco Basin/Southern Caribbean Sea

Elevation:

-790

Archive:

marine sediments (downcore)

Species:

G. ruber, white variety, with the pink variety analyzed when sample abundances were limited.

Proxy measurement:

Mg/Ca

Sampling resolution:

centennial

Climate sensitivity:

SST

Dating resolution:

4 radiocarbon dates in last ~2200 years

Dating information:

radiocarbon

Startyear:

24764 BP

Endyear:

305 BP

All uncertainties:

(3) ±0.7% (4) ±4% (5)±0.7°C

Description:

A high-resolution western tropical Atlantic sea surface temperature (SST) record from the Cariaco Basin on the northern Venezuelan shelf, based on Mg/Ca values in surface-dwelling planktonic foraminifera, reveals that changes in SST over the last glacial termination are synchronous, within ±30 to ±90 years, with the Greenland Ice Sheet Project 2 air temperature proxy record and atmospheric methane record. The most prominent deglacial event in the Cariaco record occurred during the Younger Dryas time interval, when SSTs dropped by 3° to 4°C. A rapid southward shift in the atmospheric intertropical convergence zone could account for the synchroneity of tropical temperature, atmospheric methane, and high-latitude changes during the Younger Dryas.

Data entered by name:

Delia Oppo

Data entered by email:

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Main reference(s):

Lea, D.W., D.K. Pak, L.C. Peterson, and K.A. Hughen, 2003,Synchroneity of Tropical and High-Latitude Atlantic Temperatures over the Last Glacial Termination. Science, 301, 1361-1364.

Link to reference 1:

http://www.sciencemag.org/content/301/5638/1361.full

Link to reference 2:

http://www.sciencemag.org/content/301/5638/1361/suppl/DC1

Data storage link 1:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:2567749405070175::::P1_STUDY_ID:2585

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k