SST Variations
Holocene SST reconstructions are more spatially complete sopra the North Atlantic compared to other oceans, although still primarily limited to high sediment-accumulation-rate, near-shore basins. Pioneering research seeking puro identify verso long-term andamento durante upper ocean temperatures focused on reconstructing SSTs for 9 and 6 ka, using planktonic foraminiferal assemblages ( Ruddiman and Mix, 1993 ). Calibration studies sopra the 1950s and 1960s had demonstrated that indivisible groupings of planktonic Foraminifera are highly correlated sicuro SST, per addition puro salinity and water-column nutrients ( Morey et al., 2005 ). Ruddiman and Mix (1993) found mai discernible pattern of past SST variability per the North Atlantic and questioned both the methodology used for quantitative reconstructions and the age control associated with variable sediment-accumulation rates.
A subsequent study of reconstructed summer SST for 6 ka, using per variety of methods (diatom assemblages, marine mollusks, and dinoflagellate cysts), found that warmer conditions (+ 1–4 °C relative sicuro today) inundated the Norwegian Sea, Hudson Bay, Baffin Bay, Nares Strait, Davis Strait, Labrador Sea, and Greenland Sea during a time when summertime insolation was approximately 7% higher than today ( Kerwin et al. (1999) , and references therein). Continue reading