high Atlantic reconstructed Black

Core/Site name:

PL07- 71BC

Country/Region:

Cariaco Basin

Elevation:

-395

Archive:

marine sediments (downcore)

Species:

Globigerina bulloides

Proxy measurement:

foraminiferal abundance

Sampling resolution:

annual

Climate sensitivity:

upwelling

Dating resolution:

varves, 210Pb, radiometric

Dating information:

twelve 14C dates in 800 years

Startyear:

784 14C yr BP

Endyear:

-40 14C yr BP

Description:

Black, D.E.; Peterson, L.C.; Overpeck, J.T.; Kaplan, A.; Evans, M.N.; Kashgarian, M.Earliest Year:730 cal yr BP (1220 AD) * Most Recent Year:0 cal yr BP (1950 AD) * Location Bounds - North: 10.75 * South: 10.75 * East: -64.7 * West: -64.7 * Climate in the tropical North Atlantic is controlled largely by variations in the strength of the trade winds, the position of the Intertropical Convergence Zone, and sea surface temperatures. A high-resolution study of Caribbean sediments provides a subdecadally resolved record of tropical upwelling and trade wind variability spanning the past 825 years. These results confirm the importance of a decadal (12- to 13-year) mode of Atlantic variability believed to be driven by coupled tropical ocean-atmosphere dynamics. Although a well-defined interdecadal mode of variability does not appear to be characteristic of the tropical Atlantic, there is evidence that century-scale variability is substantial. The tropical Atlantic may also have been involved in a major shift in Northern Hemisphere climate variability that took place about 700 years ago.

Data entered by name:

Kattel, Giri

Data entered by email:

This email address is being protected from spambots. You need JavaScript enabled to view it.

Main reference(s):

Black, D.E., L.C. Peterson, J.T. Overpeck, A. Kaplan, M.N. Evans, and M. Kashgarian. 1999. Eight centuries of North Atlantic ocean-atmosphere variability. Science 286:1709-1713.

Link to reference 1:

http://www.sciencemag.org/content/286/5445/1709.short

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/black1999/

Comments:

The age model is based on a combination of varve counts, 210Pb, and accelerator mass spectrometry 14C dates.

Current dating method:

-- select --

Annual snow acc rate:

-- select --

Category: Ocean2k