Dr. Senchao Lai
Institut für Anorganische und Analytische Chemie
AK Prof. Dr. Hoffmann
Iodine speciation in atmospheric aerosols in marine boundary layer
Betreuer: Prof. Dr. T. Hoffmann
New particle formation via secondary gas-to-particle conversion processes over the oceans is one of the main mechanisms controlling the marine aerosol number population; however, despite extensive effort over the years, this phenomenon is still not well quantified. Iodine species are believed to contributed a lot to the new particle formation process in the marine boundary layer (MBL). It has been pointed out that most probable chemical species involve in the production or growth of these particles are iodine oxides, produced photochemically from biogenic halocarbon emissions and/or iodine emission from the sea surface. Recent chamber and model studies have confirmed those particles formations from gaseous to I2 or CH2I2 in the presence of ozone and UV light. Many questions remain open though numerous studies about the release of reactive organic iodocarbons (e.g. CH2I2, CH2ClI, CH2BrI, CHBr2I) from marine biota into the atmosphere have been performed. Therefore, sampling, identification and quantification of those iodine species have become necessary for the understanding of atmospheric iodine chemistry in MBL.