Low Pacific Native Stott

Core/Site name:

MD98-2176

Country/Region:

Western Tropical Pacific

Elevation:

-2382

Archive:

marine sediments (downcore)

Species:

G. ruber

Proxy measurement:

foraminiferal stable isotope and Mg/Ca &d18O

Sampling resolution:

multi-decadal

Climate sensitivity:

SST

Dating resolution:

36cm=523 yBP; 2 dates/1500 years

Dating information:

radiometric

Startyear:

21010 yr BP

Endyear:

125 yr BP

All uncertainties:

age to core top extrapolated from 523 yBP date

Description:

Establishing what caused Earth's largest climatic changes in the past requires a precise knowledge of both the forcing and the regional responses. We determined the chronology of high- and low-latitude climate change at the last glacial termination by radiocarbon dating benthic and planktonic foraminiferal stable isotope and magnesium/calcium records from a marine core collected in the western tropical Pacific. Deep-sea temperatures warmed by ~2ºC between 19 and 17 thousand years before the present (ky B.P.), leading the rise in atmospheric CO2 and tropical-surface-ocean warming by ~1000 years. The cause of this deglacial deep-water warming does not lie within the tropics, nor can its early onset between 19 and 17 ky B.P. be attributed to CO2 forcing. Increasing austral-spring insolation combined with sea-ice albedo feedbacks appear to be the key factors responsible for this warming.

Data entered by name:

Hiu Tung Ko

Data entered by email:

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Main reference(s):

Stott, L.D., A. Timmermann, and R.C. Thunell. 2007. Southern Hemisphere and Deep-Sea Warming Led Deglacial Atmospheric CO2 Rise and Tropical Warming. Science, 318(5849), 435 - 438.

Link to reference 1:

http://www.sciencemag.org/content/318/5849/435

Link to reference 2:

http://climate.biol.sc.edu/Publications/2007/timmerman2007.pdf

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/stott2007/

Data storage link 2:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:3757743008453739::::P1_STUDY_ID:6400

Comments:

There are three separate cores. For Elevation/Depth (m), the range covered by the composite of all cores was taken.Entry updated by H. McGregor 25/4/2012

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k