Dynamical Reconstruction of Upper-Ocean Conditions in the Last Glacial Maximum Atlantic
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Dail-2014-Dynamical reconstruc.pdf
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2.39 MB
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Author(s)
Dail, Holly Janine
Wunsch, Carl Isaac
Date Issued
January 2014
Journal
Journal of Climate
Publisher
American Meteorological Society
Citation
Dail, Holly, and Carl Wunsch. “Dynamical Reconstruction of Upper-Ocean Conditions in the Last Glacial Maximum Atlantic.” J. Climate 27, no. 2 (January 2014): 807–823. © 2014 American Meteorological Society
Version
Final published version
Abstract
Proxies indicate that the Last Glacial Maximum (LGM) Atlantic Ocean was marked by increased meridional and zonal near sea surface temperature gradients relative to today. Using a least squares fit of a full general circulation and sea ice model to upper-ocean proxy data with specified error estimates, a seasonally varying reconstruction is sought of the Atlantic Ocean state that is consistent with both the known dynamics and the data. With reasonable uncertainty assumptions for the observations and the adjustable (control) variables, a consistent LGM ocean state is found, one not radically different from the modern one. Inferred changes include a strengthening of the easterly and westerly winds, leading to strengthened subtropical and subpolar gyres, and increased upwelling favorable winds off the coast of Africa, leading to particularly cold SSTs in those regions.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1175/JCLI-D-13-00211.1
