Increased biological productivity and export production in the glacial Southern Ocean

Autor:	Martin Suter, Peter W. Kubik, Richard A. Mortlock, Philip N. Froelich, Robert F. Anderson, Naresh Kumar, Beate Dittrich-Hannen
Rok vydání:	1995
Předmět:	Radionuclide Multidisciplinary Detritus Range (biology) fungi humanities Atmosphere chemistry.chemical_compound Oceanography Productivity (ecology) chemistry Carbon dioxide Environmental science Glacial period geographic locations
Zdroj:	Nature. 378:675-680
ISSN:	1476-4687 0028-0836
DOI:	10.1038/378675a0
Popis:	A range of complementary radionuclide proxies in sediments of the southernmost Atlantic Ocean over the past 140,000 years indicate that glacial periods were characterized by greatly increased fluxes of biogenic detritus out of surface waters. This increase in export production, which may have contributed to lower concentrations of carbon dioxide in the glacial atmosphere, was accompanied by more than a fivefold increase in accumulation of lithogenic iron transported by winds from Patagonian deserts. These observations support the hypothesis that the iron limitation of today's Southern Ocean productivity was relieved in glacial periods by a greater supply of iron from wind-blown dust.
Databáze:	OpenAIRE
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