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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-320
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
06 Jun 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Primary marine aerosol physical and chemical emissions during a nutriment enrichment experiment in mesocosms in the Mediterranean Sea
Allison N. Schwier1, Karine Sellegri1, Sébastien Mas2, Bruno Charrière3,7, Jorge Pey4,a, Clémence Rose1, Brice Terminé-Roussel4, Jean-Luc Jaffrezo5, David Parin2, David Picard1, Mickael Ribeiro1, Greg Roberts6, Richard Sempéré7, Nicolas Marchand4, and Barbara D'Anna8 1Laboratoire de Météorologie Physique CNRS UMR6016, Observatoire de Physique du Globe de Clermont-Ferrand, Université Blaise Pascal, 63171 Aubière, France
2Centre d'écologie marine expérimentale MEDIMEER, UMS3282 OSU OREME, Université de Montpellier, CNRS/IRD, Sète, France
3Centre de Formation et de Recherche sur les Environnements Méditerranéens CNRS UMR5110, Université de Perpignan Via Domitia, 66860 Perpignan, France
4Aix Marseille Univ., CNRS, LCE, Marseille, France
5Univ. Grenoble Alpes, CNRS, LGGE, F-38000 Grenoble, France
6Centre National de Recherches Météorologiques (CNRM), Météo-France, Toulouse, France
7Aix- Marseille Université, Mediterranean Institute of Oceanography (MIO), CNRS/IRD, Université de Toulon, UM 110, 13288 Marseille, France
8Institut de Recherches Sur la Catalyse et l'Environnement de Lyon CNRS UMR5256, Université Claude Bernard Lyon 1, 69626 Villeurbanne, France
anow at: Geological Survey of Spain (IGME), 50006 Zaragoza, Spain
Abstract. While primary marine aerosol (PMA) is an important part of global aerosol total emissions, its chemical composition and physical flux as a function of the biogeochemical properties of the seawater still remain highly uncharacterized due to the multiplicity of physical, chemical and biological parameters that are involved in the emission process. Here, nutrient enriched-mesocosms filled with Mediterranean seawater were studied over a three-week period. PMA generated from the mesocosm waters were characterized in term of chemical composition, size distribution and size segregated cloud condensation nuclei (CCN), as a function of the seawater chlorophyll-a (Chl-a) concentration, pigment composition, virus and bacteria abundances. In all mesocosms (enriched and control mesocosms), we detected an enrichment of calcium and a deficit in chloride in the submicron PMA mass compared to the literature inorganic composition of the seawater. A positive linear correlation was found between the aerosol number concentration flux and the seawater temperature, that could be specific to the mediteranean seawater temperature and organic content. We found that the artificial phytoplankton bloom did not affect the condensation nuclei (CN) or CCN number concentration, the normalized size distribution, the CCN activation diameter or the organic fraction of the PMA compared to the control mesocosm. However, we observed correlations between the organic fraction of the Aitken mode particles and heterotrophic flagellates, viruses, and dissolved organic carbon (DOC). No correlation between the particle organic fraction and Chl-a was observed, contrary to previous observations in natural bloom mesocosm experiments. We believe that this could be due to (1) different complexities compared to natural bloom systems, or (2) longer time periods needed to observe correlation trends.

Citation: Schwier, A. N., Sellegri, K., Mas, S., Charrière, B., Pey, J., Rose, C., Terminé-Roussel, B., Jaffrezo, J.-L., Parin, D., Picard, D., Ribeiro, M., Roberts, G., Sempéré, R., Marchand, N., and D'Anna, B.: Primary marine aerosol physical and chemical emissions during a nutriment enrichment experiment in mesocosms in the Mediterranean Sea, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-320, in review, 2017.
Allison N. Schwier et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'review 1', Anonymous Referee #2, 01 Aug 2017 Printer-friendly Version 
AC1: 'Reviewer's 2 point-by-point answer', Karine Sellegri, 07 Sep 2017 Printer-friendly Version 
 
RC2: 'review of Schwier et al.', Anonymous Referee #1, 01 Aug 2017 Printer-friendly Version 
AC2: 'Reviewer1 point-by-point answer', Karine Sellegri, 07 Sep 2017 Printer-friendly Version 
Allison N. Schwier et al.
Allison N. Schwier et al.

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Short summary
In the present paper, we quantify sea-to-air emission fluxes of aerosol to the atmosphere and characterize their physical and chemical properties as a function of the seawater biochemical and physical properties. Fluxes are evaluated with an original approach: a lab in the field experiment that preserves the seawater and atmospheric complexity, while isolating air-to-sea exchanges from their surroundings. We show different features of the aerosol emission fluxes compared to previous findings.
In the present paper, we quantify sea-to-air emission fluxes of aerosol to the atmosphere and...
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