globalchange  > 气候减缓与适应
DOI: 10.1002/2014GL061382
European glacial dust deposits: Geochemical constraints on atmospheric dust cycle modeling
Author: Rousseau D.-D.; Chauvel C.; Sima A.; Hatté C.; Lagroix F.; Antoine P.; Balkanski Y.; Fuchs M.; Mellett C.; Kageyama M.; Ramstein G.; Lang A.
Source Publication: Geophysical Research Letters
ISSN: 0094-9651
EISSN: 1944-9382
Publishing Year: 2014
Volume: 41, Issue:21
pages begin: 7666
pages end: 7674
Language: 英语
Keyword: dust ; Europe ; last climate cycle ; loess
Scopus Keyword: Arid regions ; Benchmarking ; Boundary layers ; Climate models ; Deposition ; Geochemistry ; Geographical distribution ; Sediments ; Atmospheric model ; Climate cycle ; Climate feedbacks ; Critical constraints ; Europe ; Geochemical data ; loess ; Model experiments ; Dust ; aerosol ; atmospheric modeling ; boundary layer ; climate feedback ; deflation ; dust ; geochemical survey ; geographical distribution ; glacial environment ; loess ; Europe
English Abstract: For a long time global paleodust numerical simulations have greatly underestimated dust sources other than modern deserts. Recent modeling experiments incorporating glaciogenic sources of dust have positively improved the agreement between model and paleodust data. This highlights the importance of accurately representing all areas potentially subjected to deflation during an investigated interval. Geochemical results, obtained from European loess sequences collected along a 50°N transect, combined with dust emission simulations reveal the geographical distribution of the most important European dust sources between 34 ka and 18 ka. We demonstrate that most European dust traveled only a few hundred kilometers or less within the boundary layer from its source before deposition. We conclude that our results encourage acquisition of similar geochemical data for other relevant areas in the world. Further, they could provide critical constraints to benchmark atmospheric models, contributing to improve their performance in simulating dust cycle and associated climate feedbacks. Key Points We identify the main aerosol sources for different depositional areasThe main contributors were regions between 48 and 52°N, with variable hot spotsDust was transported at low elevation and over regional distances only ©2014. American Geophysical Union. All Rights Reserved.
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Appears in Collections:气候减缓与适应

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Affiliation: Ecole Normale Supérieure, Laboratoire de Météorologie Dynamique, CERES-ERTI, Paris, France

Recommended Citation:
Rousseau D.-D.,Chauvel C.,Sima A.,et al. European glacial dust deposits: Geochemical constraints on atmospheric dust cycle modeling[J]. Geophysical Research Letters,2014-01-01,41(21).
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