44 1001 Boering, Kristie; Andrews, Arlyn; Daube, Bruce; Alex, Simson; Wofsy, Steve Harvard University, Cambridge, MA 02138 (617-495-5361) Balloon CO2 Experiment OMS 1 1 1997 06 30 1998 07 12 0 Elapsed time in UT seconds from 0 hours on flight date 1 1.00 999999 Mean Age in years 0 29 The boundary condition for the newest air in the stratosphere has been obtained from in situ observations of CO2 from 1992-1997 and is well represented by the average of NOAA CMDL MLO and SMO ground station data delayed by 2 months. See Boering et al, [1996] for details. The calculated age is the difference between the flight date and the date that air with the observed CO2 (corrected for CH4 oxidation--see below) entered the stratosphere. The seasonal cycle in the CO2 boundary condition is removed by taking a twelve month running mean of the MLO/SMO index, and the lag time is calculated relative to a linear fit to this deseasonalized boundary condition. Stratospheric production of CO2 by CH4 oxidation is accounted for by assuming that the difference between observed CH4 and the tropospheric value (1700 ppb) is due to conversion of CH4 to CO2. Thus, AGE = x - (1749.88 + 0.68241*(CO2 - (1.7 - CH4 ))), where CO2 and CH4 are in units of ppm and x is the flight date in years (e.g. July 4, 1997 would be 1997.50). For the ER-2 flights, ATLAS N2O data and the observed correlation between ATLAS N2O and ALIAS CH4 have been used to determine the CH4 concentration (CH4= 0.56 + 0.002287*N2O + 4.6e-6*N2O^2 with N2O in ppb and CH4 in ppm). For the OMS flights, ALIAS II CH4 data is used in the age calculation. Mean ages are not given for air with N2O > 280 ppb due to errors associated with the persistence of the CO2 seasonal cycle. Estimates of age for air with N2O > 280 are available from the investigators. For air with N2O < 280 ppb, the error associated with the age calculation is believed to be < 0.25 years. Boering, K. A., S. C. Wofsy, B. C. Daube, H. R. Schneider, M. Loewenstein, J. R. Podolske, T. J. Conway, Stratospheric Mean Ages and Transport Rates from Observations of Carbon Dioxide and Nitrous Oxide, Science, 274,1340,1996. 57370. 2.44 57390. 2.62 57410. 2.86 57430. 2.98 57450. 3.12 57800. 2.18 57830. 2.47 57840. 2.41 57850. 2.38 57860. 2.34 57870. 2.31 57880. 2.25 57890. 2.32 57900. 2.38 57910. 2.40 57920. 2.44 57930. 2.41 57940. 2.54 57950. 2.56 57960. 2.51 57970. 2.62 57980. 2.69 57990. 3.30 58000. 3.28 58010. 3.03 58020. 3.00 58030. 2.89 58040. 2.79 58050. 2.66 58060. 2.61 58070. 2.55 58080. 2.61 58090. 2.69 58100. 2.65 58110. 2.80 58120. 2.86 58130. 2.87 58140. 2.86 58150. 2.88 58160. 2.89 58170. 2.95 58190. 3.04 58280. 3.76 58290. 3.68 58300. 3.62 58310. 3.68 58320. 3.74 58330. 3.88 58340. 3.88 58350. 4.00 58360. 4.05 58370. 4.07 58380. 4.12 58390. 4.20 58400. 4.19 58410. 4.27 58420. 4.41 58430. 4.51 58450. 4.75 58460. 4.88 58470. 5.03 58480. 5.23 58490. 5.44 58500. 5.55 58510. 5.73 58520. 5.67 58530. 5.63 58540. 5.41 58550. 5.14 58560. 4.93 58570. 4.68 58580. 4.59 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