The use of seasonally resolved temperature data to identify the cause of marine climate change

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Johnson, Andrew L. A., Valentine, Annemarie, Leng, Melanie J., Sloane, Hilary J., Schöne, Bernd R. and Surge, Donna 2017. The use of seasonally resolved temperature data to identify the cause of marine climate change. European Geosciences Union.
AuthorsJohnson, Andrew L. A., Valentine, Annemarie, Leng, Melanie J., Sloane, Hilary J., Schöne, Bernd R. and Surge, Donna
Abstract

On the continental shelf of the eastern USA, seasonal variation in water temperature is much lower south of Cape Hatteras than it is to the north as a result of the influence of warm currents, which raise winter temperature. High temperatures north of Cape Hatteras during the Pliocene have been attributed to greater northward penetration of warm currents in the absence of a feature analogous to Cape Hatteras. However, oxygen isotope thermometry using serial ontogenetic samples from scallops reveals a high seasonal temperature range at some horizons, suggesting that overall warming was the consequence of general climate change, with the absence of a ‘Cape Hatteras’ feature allowing greater southward penetration of cold currents, resulting in low winter temperatures at a southerly latitude. Evidence from other taxa indicates that at times seasonal variation in water temperature was quite low and that there was greater northward penetration of warm currents. This may relate to increases in vigour of the Gulf Stream. The study shows how seasonally resolved temperature data can assist identification of the driving forces of marine climate change.

KeywordsMarine climate; Seasonality; Pliocene; Current configuration; Eastern USA
Year2017
JournalGeophysical Research Abstracts
PublisherEuropean Geosciences Union
Web address (URL)http://hdl.handle.net/10545/621601
http://creativecommons.org/licenses/by-nc-nd/4.0/
hdl:10545/621601
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Publication datesApr 2017
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Deposited10 May 2017, 13:57
ContributorsUniversity of Derby, University of Loughborough, British Geological Survey, University of Mainz and University of North Carolina at Chapel Hill
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