Randall is a visitor from Prof. Rainer Volkamer's group at the University of Colorado. He will be working on a laboratory project to examine the oxidation of unsaturated aldehydes in the atmosphere. These molecules have been measured in the free troposphere over the remote ocean. Their oxidation may provide a "missing" source of glyoxal over the oceans. The work will help to understand measurements of organics made by the TOGA instrument in recent campaigns.