Aircraft(ER-2) and Balloon In-Situ Measurements of HC1, NO 2 , HNO 3 , N 2 o, and CH 4 for Testing Heterogeneous Chemistry on PSC's and Sulfate Aerosols in the 1991/92 Arctic Winter and the 1994 Antarctic Winter
Concentrations of HC1 measured in the 1991/3 northern hemisphere lower stratosphere from the ER-2 aircraft are significantly lower than model predictions using both gas phase and heterogeneous chemistry, but are in much better agreement with model predictions for the 1994 southern hemisphere.