Code 613.3 Branch Lunch Speaker: Rainer Volkamer

University of Colorado at Boulder

Ongoing field, laboratory and model development research in the Atmospheric Trace Molecule Spectroscopy Laboratory (ATMOSpeclab) at CU Boulder is discussed that is of relevance to atmospheric composition and chemistry. About 70% of the Earth's surface is covered by oceans, yet the open ocean marine atmosphere is among the most poorly probed environments of our planet. Recent our findings from ship campaigns indicate previously unrecognized sources for reactive halogen species and oxygenated hydrocarbons over the tropical Pacific Ocean that cool our planet by destroying heat trapping and toxic tropospheric ozone, and by forming precursor gases for climate cooling aerosols. Further, recent laboratory data finds the rate of secondary organic aerosol formation from volatile glyoxal is greatly enhanced by photochemical reactions in aqueous aerosols, suggesting that glyoxal is a relevant SOA source already in the absence of clouds.