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  Seasonal and interannual variability of the mineral dust cycle under present and glacial climate conditions

Werner, M., Tegen, I., Harrison, S. P., Kohfeld, K. E., Prentice, I. C., Balkanski, Y., et al. (2002). Seasonal and interannual variability of the mineral dust cycle under present and glacial climate conditions. Journal of Geophysical Research-Atmospheres, 107(24), 4744. doi:10.1029/2002JD002365.

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 Creators:
Werner, M.1, Author           
Tegen, I.2, Author           
Harrison, S. P.1, Author           
Kohfeld, K. E.1, Author           
Prentice, I. C.2, Author           
Balkanski, Y., Author
Rodhe, H., Author
Roelandt, C.1, Author           
Affiliations:
1Research Group Paleo-Climatology, Dr. S. P. Harrison, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497765              
2Department Biogeochemical Synthesis, Prof. C. Prentice, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497753              

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Free keywords: dust; mineral aerosol; glacial climate; GCM simulation; LGM; GRIP/GISP ice cores Sea-surface temperature; general-circulation model; project-2 ice core; greenland ice; north-atlantic; pacific-ocean; saharan dust; atmospheric circulation; size distributions; last deglaciation
 Abstract: We present simulations of the dust cycle during present and glacial climate states, using a model, which explicitly simulates the control of dust emissions as a function of seasonal and interannual changes in vegetation cover. The model produces lower absolute amounts of dust emissions and deposition than previous simulations of the Last Glacial Maximum (LGM) dust cycle. However, the simulated 2- to 3-fold increase in emissions and deposition at the LGM compared to today, is in agreement with marine- and ice-core observations, and consistent with previous simulations. The mean changes are accompanied by a prolongation of the length of the season of dust emissions in most source regions. The increase is most pronounced in Asia, where LGM dust emissions are high throughout the winter, spring and summer rather than occurring primarily in spring as they do today. Changes in the seasonality of dust emissions, and hence atmospheric loading, interact with changes in the seasonality of precipitation, and hence of the relative importance of wet and dry deposition processes at high northern latitudes. As a result, simulated dust deposition rates in the high northern latitudes show high interannual variability. Our results suggest that the high dust concentration variability shown by the Greenland ice core records during the LGM is a consequence of changes in atmospheric circulation and precipitation locally rather than a result of changes in the variability of dust emissions.

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 Dates: 2002
 Publication Status: Issued
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 Identifiers: DOI: 10.1029/2002JD002365
Other: BGC0561
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Title: Journal of Geophysical Research-Atmospheres
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 107 (24) Sequence Number: - Start / End Page: 4744 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264_1