Question 3. High concentrations of chlorine radicals (ClOx = Cl + CIO) in the antarctic spring stratosphere cause rapid destruction of Os. Recent observations indicate that the extent of O3 depletion in antarctic spring is ultimately limited by conversion of ClOx to the long-lived HCl reservoir as O3 concentrations fall to very low levels. Consider an air parcel in the antarctic spring stratosphere containing 0.8 ppmy CH4, 0.6 ppmv 03, 0.3 ppbv NOx, and 1.0 ppby ClOx, with an air density na = 3.5x1018 molecules cm3. The following reactions cycle the ClOx and NOx radicals: Cl + 03 CIO + O2 CIO + NO + Cl + NO2 NO + 03 NO2 + O2 NO2+ hv 02 NO + 03 (1) (2) (3) k= 7.9 x 10-12 cm moleculel 1 k2= 2.7 x 10-11 cm molecule 1 s1 k3= 1.8 x 10-15 cm molecule 1 s1 (4) kar 1 x 102 51 (a)Assuming steady state for ClOx and NOx radicals, show that [Cl]