High Atlantic native Goodkin

Country/Region:

Bermuda

Archive:

corals

Species:

Diploria labyrinthiformis

Proxy measurement:

NAOindex based Sr/Ca

Sampling resolution:

annual

Startyear:

1781 AD

Endyear:

1988 AD

Description:

The North Atlantic Oscillation is a meridional oscillation of atmospheric mass measured between Iceland and the Azores, which drives winter climate variability in eastern North America and Europe. A prolonged period of the positive phase during the 1990s led to the suggestion that anthropogenic warming was affecting the behaviour of the North Atlantic Oscillation. However, instrumental records are too short to compare observations during periods of extended warm and cold hemispheric temperatures, and existing palaeoclimate reconstructions primarily capture terrestrial variability. Here we present a record of Sr/Ca, a sea surface temperature proxy, from a Bermuda coral from 1781 to 1999. We use this monthly resolved record to reconstruct past variability of the North Atlantic Oscillation at multiple frequencies. Our record shows enhanced multidecadal scale variability during the late twentieth century compared with the end of the Little Ice Age (1800-1850). We suggest that variability within the North Atlantic Oscillation is linked to the mean temperature of the Northern Hemisphere, which must be considered in any long-term predictions.

Data entered by name:

Filipsson, Helena

Data entered by email:

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Main reference(s):

Goodkin, N.F., K.A. Hughen, S.C. Doney, and W.B. Curry. 2008. Increased multidecadal variability of the North Atlantic Oscillation since 1781. Nature Geoscience, Vol. 1, pp. 844-847, doi:10.1038/ngeo352

Link to reference 1:

http://www.nature.com/ngeo/journal/v1/n12/abs/ngeo352.html

Data storage link 1:

http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:938973059740019::::P1_STUDY_ID:9812

Data storage link 2:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/atlantic/goodkin2010nao.txt

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k