Peroxy Radicals and Ozone Photochemistry during the Northern Hemisphere Winter-to-Spring Transition

Peroxy radicals and many other species were measured during the winter-to-spring seasonal transition of 2000. Species were measured aboard the NCAR/NSF C130 as flights were performed from February through May from 40 to 85 degrees north latitude. Numerical models were used to evaluate the role of various processes in the production and loss of peroxy radicals and the effect on the ozone tendency. The measurements and the results of this analysis will be presented.