Tracking the sea-level signature of the 8.2 ka cooling event: New constraints from the Mississippi Delta

Details Tracking the sea-level signature of the 8.2 ka cooling event: New constraints from the Mississippi Delta Tracking the sea-level signature of the 8.2 ka cooling event: New constraints from the Mississippi Delta

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3123309t&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 23, CiteID L23309

Astronomy and Astrophysics

Astrophysics

13

Oceanography: Physical: Sea Level Variations, Global Change: Climate Dynamics (3309), Oceanography: General: Paleoceanography, Meteorology And Atmospheric Dynamics: Paleoclimatology, Hydrology: Glaciology (1863)

Scientific paper

The ever increasing need for accurate predictions of global environmental change under greenhouse conditions has sparked immense interest in an abrupt, century-scale cooling around 8200 years ago, with a focal point in the North Atlantic and with hemispheric teleconnections. Despite considerable progress in the unraveling of this striking feature, including a conceivable driving mechanism (rapid drainage of proglacial Lake Agassiz/Ojibway and a resulting reduced strength of North Atlantic thermohaline circulation), several key questions remain unanswered. One salient aspect concerns the total amount of freshwater released during this catastrophic event, likely echoed by a near-instantaneous eustatic sea-level rise. So far, no attempts have been made to perform high-resolution sea-level studies that explicitly focus on this critical time interval. Here, we present new data from the Mississippi Delta suggestive of abrupt sea-level rise associated with the 8.2 ka event. However, the amount of sea-level rise was likely less than ~1.2 m, corresponding to a meltwater volume of less than ~4.3 1014 m3; values lower than estimates used by several recent studies.

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