SST Variations

Holocene SST reconstructions are more spatially complete in the North Atlantic compared puro other oceans, although still primarily limited to high sediment-accumulation-rate, near-shore basins. Pioneering research seeking to identify a long-term tendenza con upper ocean temperatures focused on reconstructing SSTs for 9 and 6 ka, using planktonic foraminiferal assemblages ( Ruddiman and Mix, 1993 ). Calibration studies per the 1950s and 1960s had demonstrated that indivis groupings of planktonic Foraminifera are highly correlated sicuro SST, in additif to salinity and chicchera-column nutrients ( Morey et al., 2005 ). Ruddiman and Mix (1993) found giammai discernible pattern of past SST variability mediante 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 esatto today) inundated the Norwegian Sea, Hudson Bay, Baffin Bay, Nares Strait, Davis Strait, Labrador Sea, and Greenland Sea during verso time when summertime insolation was approximately 7% higher than today ( Kerwin et al. (1999) , and references therein). This movimento of warmer-than-present SSTs during the early sicuro middle Holocene is perhaps best illustrated mediante core MD952011 ( Sbucciato et al., 2002 ) from the Norwegian Sea where maximum SST warming (+ 2 ° C incomplete puro today) accompanied the Holocene Thermal Maximum between 8.6 and 5.5 ka, followed by verso gradual cooling preciso today’s temperatures.

A major breakthrough in Holocene paleoceanography was made with the development of alkenone paleothermometry in the 1980s ( Brassell et al., 1986 ). Leia mais

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