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| Titel |
Longitudinal variability of the biogeochemical role of Mediterranean aerosols in the Mediterranean Sea |
| VerfasserIn |
E. Ternon, C. Guieu, C. Ridame, S. L'Helguen, P. Catala |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 5 ; Nr. 8, no. 5 (2011-05-05), S.1067-1080 |
| Datensatznummer |
250005807
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| Publikation (Nr.) |
 copernicus.org/bg-8-1067-2011.pdf |
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| Zusammenfassung |
| The Mediterranean Sea is a semi-enclosed basin characterized by a strong
thermal stratification during summer during which the atmosphere is the main
source of new nutrients to the nutrient-depleted surface layer. From aerosol
sampling and microcosm experiments performed during the TransMed BOUM cruise
(June–July 2008) we showed that: (i) the Mediterranean atmosphere
composition (Al, Fe, P) was homogeneous over ~28° of longitude and
was a mixture with a constant proportion of anthropogenic contribution and a
variable but modest contribution of crustal aerosols. This quite stable
composition over a one month period and a long transect (~2500 km)
allowed to define the Mediterranean atmospheric "background" that
characterizes the summer season in the absence of major Saharan event and
forest fires, (ii) primary production significantly increased at all tested
stations after aerosols addition collected on-board and after Saharan dust
analog addition, indicating that both additions relieved on-going
(co)-limitations. Although both additions significantly increased the
N2 fixation rates at the western station, diazotrophic activity
remained very low (~0.2 nmol N L−1 d−1), (iii) due to the
presence of anthropogenic particles, the probable higher solubility of
nutrients associated with mixed aerosols (crustal + anthropogenic
contribution), conferred a higher fertilizing potential to on-board
collected aerosol as compared to Saharan dust analog. Finally, those
experiments showed that atmospheric inputs from a mixed atmospheric event
("summer rain" type) or from a high-intensity Saharan event would induce
comparable response by the biota in the stratified Mediterranean SML, during
summer. |
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