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| Titel |
Mass deposition fluxes of Saharan mineral dust to the tropical northeast Atlantic Ocean: an intercomparison of methods |
| VerfasserIn |
N. Niedermeier, A. Held, T. Müller, B. Heinold, K. Schepanski, I. Tegen, K. Kandler, M. Ebert, S. Weinbruch, K. Read, J. Lee, K. W. Fomba, K. Müller, H. Herrmann, A. Wiedensohler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 5 ; Nr. 14, no. 5 (2014-03-04), S.2245-2266 |
| Datensatznummer |
250118457
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| Publikation (Nr.) |
 copernicus.org/acp-14-2245-2014.pdf |
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| Zusammenfassung |
| Mass deposition fluxes of mineral dust to the tropical northeast Atlantic
Ocean were determined within this study. In the framework of SOPRAN (Surface
Ocean Processes in the Anthropocene), the interaction between the atmosphere
and the ocean in terms of material exchange were investigated at the Cape
Verde atmospheric observatory (CVAO) on the island Sao Vicente for January
2009. Five different methods were applied to estimate the deposition flux,
using different meteorological and physical measurements, remote sensing, and
regional dust transport simulations. The set of observations comprises
micrometeorological measurements with an ultra-sonic anemometer and profile
measurements using 2-D anemometers at two different heights, and
microphysical measurements of the size-resolved mass concentrations of
mineral dust. In addition, the total mass concentration of mineral dust was
derived from absorption photometer observations and passive sampling. The
regional dust model COSMO-MUSCAT was used for simulations of dust emission
and transport, including dry and wet deposition processes. This model was
used as it describes the AOD's and mass concentrations realistic compared to
the measurements and because it was run for the time period of the
measurements. The four observation-based methods yield a monthly average
deposition flux of mineral dust of 12–29 ng m−2 s−1. The
simulation results come close to the upper range of the measurements with an
average value of 47 ng m−2 s−1. It is shown that the mass
deposition flux of mineral dust obtained by the combination of
micrometeorological (ultra-sonic anemometer) and microphysical measurements
(particle mass size distribution of mineral dust) is difficult to compare to
modeled mass deposition fluxes when the mineral dust is
inhomogeneously distributed over the investigated area. |
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