MASS FLUXES OF O-3, CH4, N2O AND CF2CL2 IN THE LOWER STRATOSPHERE CALCULATED FROM OBSERVATIONAL DATA

Trace gas mixing ratio data from the Upper Atmosphere Research Satelli te (UARS) are combined with a radiatively derived transformed Eulerian mean (TEM) stream function to estimate the net ozone (O-3) mass flux from the stratosphere to the troposphere and to investigate the net fl uxes of methane (CH4), nitrous oxide (N2O), and CFC-12 (CF2Cl2) into t he lower stratosphere. The mass fluxes of ozone and long-lived tracers such as nitrous oxide, methane, and CFC-12 in the lower stratosphere can be estimated from data obtained by the cryogenic limb array etalon spectrometer (CLAES), the microwave limb sounder (MLS) for ozone, and the Halogen Occultation Experiment (HALOE) for ozone and methane. The flux of ozone from the stratosphere to the troposphere is estimated t o be 510 Tg of ozone per year with a range of 450 to 590 Tg O-3/yr. Ne t fluxes into the stratosphere are estimated as 27 Tg of methane per y ear, 8 Tg/yr of N in nitrous oxide, and 0.08 Tg/yr of CF2Cl2. There is good agreement with previous estimates within the range of uncertaint y of these calculations.