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Preprints
https://doi.org/10.5194/acp-2020-406
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-406
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 23 Jun 2020

Submitted as: research article | 23 Jun 2020

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This preprint is currently under review for the journal ACP.

Mediterranean nascent sea spray organic aerosol and relationships with seawater biogeochemistry

Evelyn Freney1, Karine Sellegri1, Alessia Nicosia1, Jonathan T. Trueblood1, Matteo Rinaldi3, Leah R. Williams4, André S. H. Prévôt5, Melilotus Thyssen6, Gérald Grégori6, Nils Haëntjens7, Julie Dinasquet8,9,a, Ingrid Obernosterer9, France Van-Wambeke6, Anja Engel10, Birthe Zäncker10, Karine Desboeufs11, Eija Asmi2, Hilka Timmonen2, and Cécile Guieu12 Evelyn Freney et al.
  • 1Université Clermont Auvergne, CNRS, Laboratoire de Météorologie Physique (LaMP) F-63000 Clermont-Ferrand, France
  • 2Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, FI-00101, Finland
  • 3National Research Council (CNR), Institute of Atmospheric Sciences and Climate (ISAC), Bologna, Italy
  • 4Aerodyne Research, Inc., Billerica, Massachusetts, USA
  • 5Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
  • 6Aix-Marseille University, Toulon University, CNRS, IRD, Mediterranean Institute of Oceanography UM110, Marseille 13288, France
  • 7School of Marine Sciences, University of Maine, Orono, ME 04469, USA
  • 8Marine Biology Research Division, Scripps Institution of Oceanography, 92037 La Jolla, USA
  • 9CNRS, Sorbonne Université, Laboratoire d'Océanographie Microbienne, UMR7621, F-66650 Banyuls-sur-Mer, France
  • 10GEOMAR, Helmholtz Centre for Ocean Research Kiel, 24105 Kiel, Germany
  • 11LISA, CNRS UMR7583, Université Paris Est Créteil (UPEC), Université de Paris, Institut Pierre Simon Laplace (IPSL), Créteil, France
  • 12Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, F-06230 Villefranche-sur-Mer, France
  • anow at: Center for Aerosol Impacts on Chemistry of the Environment, CASPO, Scripps Institution of Oceanography, UCSD, USA

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.

Evelyn Freney et al.

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Short summary
In this work, we present observations of the organic aerosol content in primary sea spray aerosols (SSA) continuously generated along a five-weeks cruise in the Mediterranean. This information is combined with seawater biogeochemical properties also measured continuously along the ship track to develop a number of parametrizations that can be used in models to determine SSA organic content in oligotrophic waters that represent 60 % of the oceans, from commonly measured seawater variables.
In this work, we present observations of the organic aerosol content in primary sea spray...
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