Covariant Glacial-Interglacial Dust Fluxes in the Equatorial Pacific and Antarctica
Abstract
Dust plays a critical role in Earth's climate system and serves as a natural source of iron and other micronutrients to remote regions of the ocean. We have generated records of dust deposition over the past 500,000 years at three sites spanning the breadth of the equatorial Pacific Ocean. Equatorial Pacific dust fluxes are highly correlated with global ice volume and with dust fluxes to Antarctica, which suggests that dust generation in interhemispheric source regions exhibited a common response to climate change over late-Pleistocene glacial cycles. Our results provide quantitative constraints on the variability of aeolian iron supply to the equatorial Pacific Ocean and, more generally, on the potential contribution of dust to past climate change and to related changes in biogeochemical cycles.
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We thank U. Ruth for compiling the dust flux data from Dome C on the new EDC3 time scale, M. Werner for making the data for the ECHAM4 run available, and J. Schaefer and W. Broecker for constructive comments. This research used samples provided by the Ocean Drilling Program (ODP site 849) and the University of Rhode Island core repository (TTN013-PC72). Funding for this study was provided by the National Science Foundation (grant OCE 02-21333 to R.F.A. and G.W.). We thank the Earth Institute Advance Program for supporting N.M.'s visit to Columbia University through a Marie Tharp Fellowship. This is L-DEO contribution 7143.
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Science
Volume 320 | Issue 5872
4 April 2008
4 April 2008
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American Association for the Advancement of Science.
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Received: 17 September 2007
Accepted: 19 February 2008
Published in print: 4 April 2008
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