SST Variations
Holocene SST reconstructions are more spatially complete per the North Atlantic compared puro other oceans, although still primarily limited sicuro high sediment-accumulation-rate, near-shore basins. Pioneering research seeking onesto identify a long-term movimento sopra upper ocean temperatures focused on reconstructing SSTs for 9 and 6 ka, using planktonic foraminiferal assemblages ( Ruddiman and Mix, 1993 ). Calibration studies mediante the 1950s and 1960s had demonstrated that indivis groupings of planktonic Foraminifera are highly correlated puro SST, con addenda preciso salinity and chicchera-column nutrients ( Morey et al., 2005 ). Ruddiman and Mix (1993) found no discernible pattern of past SST variability in the North Atlantic and questioned both the methodology used for quantitative reconstructions and the age control associated with variable sediment-accumulation rates.
Verso subsequent study of reconstructed summer SST for 6 ka, using verso variety of methods (diatom assemblages, marine mollusks, and dinoflagellate cysts), found that warmer conditions (+ 1–4 °C imparfaite to today) inundated the Norwegian Sea, Hudson Bay, Baffin Bay, Nares Strait, Davis Strait, Labrador Sea, and Greenland Sea during per time when summertime insolation was approximately 7% higher than today ( Kerwin et al. (1999) , and references therein). This andamento of warmer-than-present SSTs during the early esatto middle Holocene is perhaps best illustrated per core MD952011 ( Calvo et al., 2002 ) from the Norwegian Sea where maximum SST warming (+ 2 ° C imparfaite onesto today) accompanied the Holocene Thermal Maximum between 8.6 and 5.5 ka, followed by per gradual cooling esatto today’s temperatures. Lanjutkan membaca Location map of seven sediment cores from the North Atlantic and western Mediterranean Sea
