Rodrigues, FélixPio, CasimiroFialho, PauloLobo, AdelaideCarvalho, A.Cerqueira, Mário2012-10-192012-10-192001Rodrigues, F.F.; Pio, C.A.; Fialho, P.S.; Lobo, A.; Carvalho, A.; Cerqueira, M.A. (2001). «Chemical characterisation of marine aerosol in the Azores», "Physics and Chemistry of the Earth - Part B: Hydrology, Oceans and Atmosphere", 26(10), 831-834.1464-1909http://hdl.handle.net/10400.3/1516Copyright © 2001 Published by Elsevier Ltd.Ground-level concentrations of particulate matter with less than 10μm in diameter were measured in Azores Archipelago, mid-North Atlantic Ocean. Three intensive research campaigns took place between April and August 99. Observed average concentrations were 3.28±2.16 μgmˉ³ for non-sea-salt sulphate, 0.98±0.72μgmˉ³ for nitrate and 0.57±0.44μgmˉ³ for ammonium. The average value for non-sea-sulphate is higher than levels previously reported for other North Atlantic sites. The higher variability in non-sea-salt sulphate data collected in Azores Region most likely reflects a contribution due to active submarine volcanoes near the collection site (10–20 miles). We tried to make the connection between mass ratio sulphate/chloride maximums and maximum volcanic activity using seismic data. Average ratio between organic carbon and black carbon concentrations is 4.1±1.9.engMarine AerosolNorth AtlanticAzoresjournal article2012-10-08