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Please use this identifier to cite or link to this item:
http://hdl.handle.net/1956/418
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| DC Field | Value | Language |
|---|
| contributor.author | Gehlen, M. | en_US |
| contributor.author | Heinze, C. | en_US |
| contributor.author | Maier-Reimer, E. | en_US |
| contributor.author | Measures, C. I. | en_US |
| date.accessioned | 2004-08-16T09:33:50Z | en_US |
| date.accessioned | 2004-08-26T11:59:10Z | - |
| date.available | 2004-08-16T09:33:50Z | en_US |
| date.available | 2004-08-26T11:59:10Z | - |
| date.issued | 2003-03-19 | en_US |
| identifier.citation | Gehlen, M., C. Heinze, E. Maier-Reimer, and C. I. Measures, Coupled Al-Si geochemistry in an ocean general circulation model: A tool for the validation of oceanic dust deposition fields?, Global Biogeochem. Cycles, 17(1), 1028, doi:10.1029/2001GB001549, 2003. | en_US |
| identifier.issn | 0886-6236 | en_US |
| identifier.uri | http://hdl.handle.net/1956/418 | - |
| description.abstract | We introduced the marine cycle of Al into a geochemical ocean general circulation
model in order to assess the potential of modeled surface ocean dissolved Al as a tracer
for dust input to the world ocean. The geochemical cycles of Si and Al have been
coupled through the dynamics of diatoms. Aluminum is added to the ocean by
deposition of continental aerosols followed by partial dissolution of the aluminosilicate
fraction. Dissolved Al interacts with suspended siliceous particles according to a
reversible first-order scavenging reaction. Dust fields are provided by Atmospheric
General Circulation Models. A database of marine dissolved Al measurements was
collated. The ocean model results for two different dust deposition fields [Andersen et
al., 1998; Mahowald et al., 1999] are compared with these data. The model confirms a
solubility of the aluminosilicate fraction between 1.5 and 3.0%. Modeled levels of
dissolved Al in surface waters mirror the delivery of dust to the surface ocean.
Comparing dissolved Al distributions resulting from the two different dust fields, yields
significant differences in ocean dissolved Al distributions, which reflect a differential
contribution of individual source regions. Model results suggest a significant
overestimation of the North African-Arabian desert source region for the dust field after
Mahowald et al. [1999]; dust input to the central Pacific Ocean appears to be of the
correct order of magnitude. This approach allows for a direct comparison of dust fields
and proposes an independent check of the underlying parameterization of uplift,
transport and deposition of dust. | en_US |
| format.extent | 12340827 bytes | en_US |
| format.extent | 60535 bytes | - |
| format.extent | 156 bytes | - |
| format.extent | 12340827 bytes | - |
| format.mimetype | application/pdf | en_US |
| format.mimetype | text/plain | - |
| format.mimetype | text/plain | - |
| format.mimetype | application/pdf | - |
| language.iso | en | en_US |
| publisher | American Geophysical Union | en_US |
| relation.ispartofseries | Global biogeochemical cycles;17(1) | en_US |
| title | Coupled Al-Si geochemistry in an ocean general circulation model: A tool for the validation of oceanic dust deposition fields? | en_US |
| type | Article | en_US |
| Appears in Collections: | Eprints by the Geophysical Institute
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Files in This Item:
| File |
Size | Format |
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| GF-gehlen.pdf | 12051Kb | Adobe PDF | View/Open |
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