High Atlantic Native Rosenheim

Core/Site name:

Tongue of the Ocean (TOTO)/Exuma Sound/Bahamas

Country/Region:

Bahamas

Elevation:

-136

Archive:

sclerosponge

Species:

Ceratoporella nicholsoni

Proxy measurement:

Sr/Ca, d18O

Sampling resolution:

annual

Dating resolution:

constant-growth age model (145 µm/yr)

Dating information:

U/Th

Startyear:

AD 1890

Endyear:

AD 1990

Description:

Recent studies comparing shipboard data between the 1950’s and the 1990’s have shown significant, heterogeneous adjustments of the temperature-salinity structure of the N. Atlantic Ocean. Here, we present proxy records of temperature and salinity from aragonite sclerosponge skeletons, extending existing records of the Salinity Maximum Waters (SMW) of the N. Atlantic back to 1890. These proxy records show secular temperature increases of 1.6 – 2.0°C, higher than published global averages, and salinity increases of 0.35 – 0.5 psu, smaller than short-term secular trends recently measured. Salinity reconstructions vary more significantly on the decadal scale, showing changes that are related to low-frequency variations of the North Atlantic Oscillation (NAO). On both secular and decadal time scales, the records indicate significant thermohaline changes in the SMW, either via forcing at the surface or increasing depths of density surfaces in the Bahamas.

Data entered by name:

Wu, Henry

Data entered by email:

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Main reference(s):

Rosenheim, B. E., P. K. Swart, S. R. Thorrold, A. Eisenhauer, and P. Willenz (2005), Salinity change in the subtropical Atlantic: Secular increase and teleconnections to the North Atlantic Oscillation, Geophys. Res. Lett., 32, L02603, doi:10.1029/2004GL021499

Link to reference 1:

http://www.agu.org/pubs/crossref/2005/2004GL021499.shtml

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/atlantic/bahamas-sclerosponge2005.txt

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k