Low Atlantic Native Dolven -1

Core/Site name:

MD95-2011

Country/Region:

Norweigan Sea

Elevation:

-1048.0 m

Archive:

marine sediments (downcore)

Species:

polycystine radiolarians

Proxy measurement:

Nordic Seas radiolarian transfer function

Sampling resolution:

multi-decadal

Dating information:

Vedde Ash, sixteen AMS 14C dates of N. pachyderma, and peak occurrence of radiolarian species Rhizoplegma boreale

Startyear:

0.567 kyr BP

Endyear:

11.155 kyr BP

All uncertainties:

For the transfer function, the multiple correlation coefficient is 0.88 and the standard error of estimate for the regression equation is +/- 1.2 deg C.

Description:

Polycystine radiolarians are used to reconstruct summer sea surface temperatures (SSSTs) for the Late Pleistocene-Holocene (600-13,400 14C years BP) in the Norwegian Sea. At 13,200 14C years BP, the SSST was close to the average Holocene SSST (~12°C). It then gradually dropped to 7.1°C in the Younger Dryas. Near the Younger Dryas-Holocene transition (~10,000 14C years BP), the SSST increased 5°C in about 530 years. Four abrupt cooling events, with temperature drops of up to 2.1°C, are recognized during the Holocene: at 9340, 7100 ("8200 calendar years event""), 6400 and 1650 14C years BP. Radiolarian SSSTs and the isotopic signal from the GISP2 ice core are strongly coupled, stressing the importance of the Norwegian Sea as a mediator of heat/precipitation exchange between the North Atlantic, the atmosphere, and the Greenland ice sheet. Radiolarian and diatom-derived SSSTs display similarities, with the former not showing the recently reported Holocene cooling trend."

Data entered by name:

Gibson, Kelly

Data entered by email:

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Main reference(s):

Dolven, JK et al. (2002): Age determination and sea-surface reconstruction of sediment cores from the Norwegian Sea. doi:10.1594/PANGAEA.736626

Link to reference 1:

http://www.agu.org/pubs/crossref/2002/2002PA000780.shtml

Data storage link 1:

http://doi.pangaea.de/10.1594/PANGAEA.112379

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k