Marine Organic Aerosol Variability Associated with Phytoplankton Bloom Dynamics over the Remote North Atlantic Ocean
Abstract
Aerosol composition measurements are used extensively to study linkages between ocean biology and primary emitted organic aerosols in marine ecosystems, almost entirely from ship-based platforms. An additional pathway for introducing aerosols into the clean remote marine boundary layer (MBL) is entrainment of particles from aloft, a mechanism that is difficult to quantify because of a lack of vertical information from the sea-surface throughout the lower troposphere. Consequently, ship-based observations require extrapolation to cloud base to assess indirect climate effects. Here, we use aircraft-based Aerosol Mass Spectrometer (AMS, Aerodyne), Single-Particle Soot Photometer (SP2, DMT, Inc.), and Wideband Integrated Bioaerosol Sensor (WIBS-4A, DMT, Inc.) measurements to assess the vertical and spatial variability of chemical composition. While AMS and SP2 observations show that accumulation-mode composition in the MBL can be significantly affected by entrainment or long-range transport, fluorescence of coarse-mode particles measured by the WIBS suggests a biological origin. Coincident observations of lidar-based ocean particle backscattering coefficient (bbp) and ship-borne colored dissolved organic matter (CDOM) suggest that WIBS dual-wavelength fluorescence typing can be used as a tracer for ocean bbp, providing a direct connection between phytoplankton spatial distributions and overlying MBL aerosol properties.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A11L2416Z
- Keywords:
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- 0305 Aerosols and particles;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0320 Cloud physics and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0426 Biosphere/atmosphere interactions;
- BIOGEOSCIENCESDE: 4504 Air/sea interactions;
- OCEANOGRAPHY: PHYSICAL