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Content archived on 2024-05-29

Radiolarian artificial neural network-based estimation of Late Quaternary sea surface temperatures and salinities in the Arctic and Antarctic Ocean and their response to insolation forcing

Objective

The modern Boreal summer corresponds to Antarctic winter season and vice versa, while their summer and winter are separated by 6 months due to an anti-phase bipolar seesaw in solar insolation. Similarly, Boreal and Austral summer insolations suggest an ant i-phase relationship, implying that a warmer Arctic corresponds to a cooler Antarctic in the geological past. Older estimates of sea surface temperatures (SSTs) for the Last Glacial Maximum (LGM) 18,000 years ago (18K) have been suggested by several recent studies to be underestimated, which is due to large errors in the SST estimates in previous studies. Artificial neural networks (ANNs) are a branch of artificial intelligence, computer systems that have the ability to learn in a way similar to the mammali an brain. ANNs have been found to yield far better SST estimates than standard methods. It is envisaged that ANNs based on radiolarians will be used to estimate paleo-SSTs and salinities for the last 150,000 years using high-resolution data from sediment cores from the Arctic and Antarctic Oceans with emphasis on comparing climate conditions during the Holocene, LGM, and Eemian Interglacial. Since radiolarian-based ANN estimates of modern SSTs yield ~25% lower errors than older methods, we expect that t hermal changes in the world ocean at 18K reported previously would be quite different, which would have wider implications for boundary conditions (glacial/interglacial) used in different general circulation models. Radiolarian ANN-based paleo-SSTs and salinities are envisaged to reveal more realistic thermohaline changes in the subtropical and subpolar regions in both hemispheres, at the strategically located gateway of the thermohaline circulation, which transports tropical heat to the North Atlantic, resulting in warmer winters in northern Europe than would otherwise be the case, than the scenario projected by shutting down the Conveyor Belt due to abrupt climatic changes.

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FP6-2004-MOBILITY-7
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Funding Scheme

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IIF - Marie Curie actions-Incoming International Fellowships

Coordinator

GÖTEBORG UNIVERSITY
EU contribution
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Address


Sweden

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Total cost

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