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IPY-Det internasjonale polaråret 2007/2008

Paleoceanagraphic and climatic variability on decadal to millennial timescales across the Drake Passage

Tildelt: kr 0,18 mill.

Paleodrake requests support to recover cores at marine sites in order to portray the decadal-millennial scale climate and ocean variability in the Drake Passage region of Antarctica through the Holocene and the last glacial period. These records will ult imately provide the quantitative reconstructions necessary to first define the magnitude and expression of natural climate variability in the region, and then to clarify the nature of its coupling to changes in Antarctic water mass properties and circumpo lar circulation. The key topographic constraint on circumpolar circulation, the Drake Passage, is hypothesized to influence global water mass distributions and overturning rates. Consequently, any assessment of the ocean's relationship to climate ultim ately requires constraints from this region. Furthermore, our proposed marine sites provide the geographic complement to Antarctic ice core records necessary for characterizing the spatial expression of natural climate variability and identifying its orig in. The results will provide the necessary perspective for contextualizing the significance of recent trends in polar climate observed in the Southern Annular Mode and upper to deep ocean properties, relative to the magnitude of their low frequency variab ility in the past. Paleodrake is designed to capitalize on the window of opportunity presented by the presence of the G.O.Sars in the Southern Ocean as part of IPY.

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IPY-Det internasjonale polaråret 2007/2008

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