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Longitudinal Variability of the Biogeochemical Role of Mediterranean Aerosols in the Mediterranean Sea : Volume 7, Issue 6 (04/11/2010)

By Ternon, E.

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Book Id: WPLBN0004005632
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Longitudinal Variability of the Biogeochemical Role of Mediterranean Aerosols in the Mediterranean Sea : Volume 7, Issue 6 (04/11/2010)  
Author: Ternon, E.
Volume: Vol. 7, Issue 6
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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L'helguen, S., Ridame, C., Guieu, C., Catala, P., & Ternon, E. (2010). Longitudinal Variability of the Biogeochemical Role of Mediterranean Aerosols in the Mediterranean Sea : Volume 7, Issue 6 (04/11/2010). Retrieved from http://ebook2.worldlibrary.net/


Description
Description: INSU-CNRS, UMR 7093, Laboratoire d'Océanographie de Villefranche/Mer, Observatoire Océanologique de Villefranche-sur-mer, France. 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.

Summary
Longitudinal variability of the biogeochemical role of Mediterranean aerosols in the Mediterranean Sea

Excerpt
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