Mediterranean nascent sea spray organic aerosol and relationships with seawater biogeochemistry

Type Article
Acceptance Date 2021 IN PRESS
Language English
Author(s) Freney Evelyn1, Sellegri Karine1, Nicosia Alessia1, Trueblood Jonathan T1, Rinaldi Matteo3, Williams Leah R4, Prévôt André Sh5, Thyssen Melilotus6, Gregori Gerald6, Haëntjens Nils7, Dinasquet Julie8, 9, Obernosterer Ingrid9, Van Wambeke France6, Engel Anja10, Zancker Birthe10, Desboeufs Karine11, Asmi Eija2, Timmonen Hilka2, Guieu Cécile12
Affiliation(s) 1 : Université Clermont Auvergne, CNRS, Laboratoire de Météorologie Physique (LaMP) F-63000 Clermont-Ferrand, France
2 : Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, FI-00101, Finland
3 : National Research Council (CNR), Institute of Atmospheric Sciences and Climate (ISAC), Bologna, Italy
4 : Aerodyne Research, Inc., Billerica, Massachusetts, USA
5 : Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
6 : Aix-Marseille University, Toulon University, CNRS, IRD, Mediterranean Institute of Oceanography UM110, Marseille 13288, France
7 : School of Marine Sciences, University of Maine, Orono, ME 04469, USA
8 : Marine Biology Research Division, Scripps Institution of Oceanography, 92037 La Jolla, USA
9 : CNRS, Sorbonne Université, Laboratoire d'Océanographie Microbienne, UMR7621, F-66650 Banyuls-sur-Mer, France
10 : GEOMAR, Helmholtz Centre for Ocean Research Kiel, 24105 Kiel, Germany
11 : LISA, CNRS UMR7583, Université Paris Est Créteil (UPEC), Université de Paris, Institut Pierre Simon Laplace (IPSL), Créteil, France
12 : Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, F-06230 Villefranche-sur-Mer, France
Source Biogeosciences (1726-4189) (Copernicus GmbH) In Press
DOI 10.5194/acp-2020-406
Note Special issue | Atmospheric deposition in the low-nutrient-low-chlorophyll (LNLC) ocean: effects on marine life today and in the future (BG/ACP inter-journal SI) Editor(s): ACP co-editors | Coordinator: Maria Kanakidou Special issue jointly organized between Biogeosciences and Atmospheric Chemistry and Physics
Abstract

The organic mass fraction from sea spray aerosol (SSA) is currently a subject of intense research. The majority of this research is dedicated to measurements in ambient air, although recently a small number of studies have additionally focused on nascent sea spray aerosol. This work presents measurements collected during a five-week cruise in May and June 2017 in the central and western Mediterranean Sea, an oligotrophic marine region with low phytoplankton biomass. Surface seawater was continuously pumped into a bubble bursting apparatus to generate nascent sea spray aerosol. Size distributions were measured with a differential mobility particle sizer (DMPS). Chemical characterization of the submicron aerosol was performed with a time of flight aerosol chemical speciation monitor (ToF-ACSM) operating with a 15-minute time resolution, and with filter-based chemical analysis on a daily basis. Using a positive matrix factorization analysis, the ToF-ACSM non-refractory organic matter (OMNR) was separated into four different organic aerosols types which were identified as primary OA (POANR), oxidized OA (OOANR), a methanesulfonic acid type OA (MSA-OANR) and a mixed OA (MOANR). In parallel, surface seawater biogeochemical properties were monitored providing information on phytoplankton cell abundance and seawater particulate organic carbon (one-hour time resolution), and seawater surface microlayer (SML) dissolved organic carbon (DOC) (on a daily basis). Statistically robust correlations (for n > 500) were found between MOANR and nano phytoplankton cell abundance, as well as between POANR, OOANR, and particulate organic carbon (POC). Filter-based analysis of the submicron SSA showed that the non-refractory organic mass represented only 13 ± 3 % of the total organic mass, which represents 22 ± 6 % of the total sea spray mass. Parameterizations of the contributions of different types of organics to the submicron nascent sea spray aerosol are proposed as a function of the seawater biogeochemical properties for use in models.

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Freney Evelyn, Sellegri Karine, Nicosia Alessia, Trueblood Jonathan T, Rinaldi Matteo, Williams Leah R, Prévôt André Sh, Thyssen Melilotus, Gregori Gerald, Haëntjens Nils, Dinasquet Julie, Obernosterer Ingrid, Van Wambeke France, Engel Anja, Zancker Birthe, Desboeufs Karine, Asmi Eija, Timmonen Hilka, Guieu Cécile Mediterranean nascent sea spray organic aerosol and relationships with seawater biogeochemistry. Biogeosciences IN PRESS. Publisher's official version : https://doi.org/10.5194/acp-2020-406 , Open Access version : https://archimer.ifremer.fr/doc/00688/80017/