Baltic Sea Spray Emissions: In Situ Eddy Covariance Fluxes vs. Simulated Tank Sea Spray

We present the first ever evaluation of sea spray aerosol eddy covariance (EC) fluxes at near coastal conditions and with limited fetch, over water brackish (on average 7 ppt). The measurements were made on island Garpen in Baltic Sea (56°23? N, 16°06? E) September 2005. found that wind speed is a major factor driving an exponential increase salt emissions, comparable to previous studies waters higher salinity. able show inclusion thermodenuder EC system allowed for parallel dry unheated flux (representing both organic emissions) heated (300 °C) non-volatile emissions. This study’s experimental approach also included artificial formed tank locally sampled same location as fluxes. attempted use scale emissions order derive complete size distribution emission below range (0.3–2 µm diameter) optical particle counters (OPCs) system, covering total 0.01 2 diameter. In directions long fetches (corresponding similar open sea), we distinguish between (sea only) smallest bins OPC, could therefore indirectly estimate fraction. agreement several ambient experiments deriving resolved chemical mass concentration water-insoluble spray, our showed sprays dominated by sizes ?1 diameter, organics OPC sizes. Since used direct measures fluxes, confirmed suggestions this signature aerosols. two source parameterizations (Mårtensson et al. (2003) Salter (2015)) agreed fairly well observed their predicted modified actual salinity shifting diameters proportionally cubic rote If, addition, added parameterized following mono-layer model Ellison (1999), combined fell reasonably close > 0.15 µm, while one them overpredicted size. appeared be explain most differences without thermodenuder.