Salinity change in the subtropical Atlantic: Secular increase and teleconnections to the North Atlantic Oscillation

Details Salinity change in the subtropical Atlantic: Secular increase and teleconnections to the North Atlantic Oscillation Salinity change in the subtropical Atlantic: Secular increase and teleconnections to the North Atlantic Oscillation

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3202603r&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 2, CiteID L02603

Physics

4

Paleoceanography (0473, 3344), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: General: Physical And Chemical Properties Of Seawater, Geochemistry: Radiogenic Isotope Geochemistry, Geochemistry: Marine Geochemistry (4835, 4845, 4850)

Scientific paper

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.

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