Cold-water coral mounds: Evidence for early Holocene climate change and slope failure

Details Cold-water coral mounds: Evidence for early Holocene climate change and slope failure Cold-water coral mounds: Evidence for early Holocene climate change and slope failure

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3107204o&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 7, CiteID L07204

Mathematics

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2

Meteorology And Atmospheric Dynamics: Paleoclimatology, Oceanography: Biological And Chemical: Ecosystems, Structure And Dynamics, Oceanography: Physical: Currents

Scientific paper

Cold-water coral mounds occur in discrete clustered populations over a broad region from the glaciated Norwegian continental margins to the non-glaciated margins of Iberia and northwest Africa. Here we report on an interesting correlation between the Holocene growth of a mound population west of Ireland and early Holocene paleoclimatic variations in the North Atlantic region, notably the well documented `8,200 yr cold event'. An age structure for the population is calculated from growth rate estimates for the coral framework constructor Lophelia pertusa and a previously formulated population growth model. The model growth curve for the Holocene period fits the observed data well, except for a significant deflection in the data trend at about 8,500 calendar years ago. This corresponds to the time that the glacial lakes Agassiz and Ojibway, which were once dammed by a remnant of the Laurentide ice sheet, drained catastrophically into the Labrador Sea and triggered the `8,200 yr event'. This cold period may also have played a role in triggering major submarine landslides, such as the Storegga Slide.

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