Mediterranean nascent sea spray organic aerosol and relationships with seawater biogeochemistry
- 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.
Evelyn Freney et al.
Evelyn Freney et al.
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