Cooperative Institute for Research in Environmental Sciences

Analytical Chemistry Seminar: Theodore Koenig

Analytical Chemistry Seminar: Theodore Koenig

Iodine Monoxide observations from CU AMAX-DOAS aboard the NSF NCAR GV research aircraft

Theodore Koenig

The CU Airborne Multi-AXis Differential Optical Absorption Spectroscopy (CU AMAX-DOAS) instrument was deployed for the TORERO and CONTRAST field campaigns. These were in the Tropical Eastern Pacific in January-February 2012, and the Tropical Western Pacific in January-February 2014 respectively. We report the first scattered light limb measurements of IO. I will discuss a number of highlights from our observations: 1) instances of enhanced IO mixing ratios in the transition layer 2) a free troposphere background of IO that shows little variation with altitude 3) a hemispheric gradient in total IO column and 4) the first quantification of IO in the lower stratosphere. These measurements provide the best constraints to date on IO outside the planetary boundary layer. They offer the chance to begin assessing our understanding on iodine chemistry in the transition layer, free troposphere, and lower stratosphere and its impacts of climate, particularly tropospheric ozone.

Jointly sponsored by the Department of Chemistry and Biochemistry, CIRES, and the Environmental Program