Low Atlantic Native Zhao

Core/Site name:

ODP Hole 658C (20ø45'N, 18ø35'W, 2263-m) BOFS core31K (19ø00'N,2 0ø10'W,3 300 m)

Country/Region:

Africa

Elevation:

-2263m

Archive:

marine sediments (downcore)

Proxy measurement:

Alkenone saturation index uk37

Sampling resolution:

multi-decadal

Climate sensitivity:

Temperature and alkenone abundance

Dating resolution:

1 sample every 50 years

Startyear:

83906 14C yr BP

Endyear:

0BP

All uncertainties:

Not stated

Description:

The molecular stratigraphy of Biogeochemical Oceanic Flux Study core 31K (19°N, 20°10′W) and Ocean Drilling Program Hole 658C (20°45′N, 18°35′W;) has been studied for C37 alkenone abundances over the past 80 ka at high resolution (∼circa 200–500 years). The derived Uk37′ sea surface temperature record for both cores shows a range of temperatures from about 18°C during the last glacial to 21.5°C during the early Holocene. Both records also reveal changes in sea surface temperature as much as 2°-4°C over a few hundred years, which correlate well with similar abrupt climatic changes observed in cores from elsewhere in the NE Atlantic, associated with “Heinrich events.” Our results indicate that meltwater produced by these ice-rafting events was transmitted southward by the Canary Current, where it had considerable impact on sea surface temperatures in the subtropical eastern Atlantic.

Data entered by name:

Ally May

Data entered by email:

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Main reference(s):

Zhao, M., N.A.S. Beveridge, N.J. Shackleton, M. Sarnthein, and G. Eglinton. 1995. Molecular stratigraphy of cores off northwest Africa: Sea surface temperature history over the last 80 ka. Paleoceanography 10(3):661-675.

Link to reference 1:

http://www.agu.org/journals/pa/v010/i003/94PA03354/

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/zhao1995/zhao1995.txt;type=i

Data storage link 2:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp658cz-tab.txt

Comments:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/bofs-31k-tab.txtThis data link is not suitable as it only has 3 data points over 2k.

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k