48 1001 ELKINS, JAMES; HURST, DALE; ROMASHKIN, PAVEL; DUTTON, GEOFF U.S. DEPT OF COMMERCE, NOAA / CMDL / HALOCARBONS AND OTHER ATMOSPHERIC TRACE SPECIES GROUP ACATS SOLVE 1 1 1999 12 15 2000 12 21 0 ELAPSED TIME IN SECONDS FROM 00:00:00 GMT ON SAMPLE DATE 8 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 Mean Age of Air (years) Mean Age Error (1-sd) (years) Total Br (ppt) Total Organic Br (ppt) Total Inorganic Br (ppt) Total Cl (ppb) Total Organic Cl (ppb) Total Inorganic Cl (ppb) 25 The mean age (Age) of each sampled air mass was determined from the corresponding ACATS measurement of SF6 and the documented tropospheric trend of SF6 [Geller et al., 1997] using a variation of the mean age formula in Volk et al. [1997]. We use dG = -0.8 to account for a SF6 calibration scale change. This term no longer represents only a delay from the surface to the tropopause. The mean age error reported is solely based on the SF6 measurement precision and is thus useful in comparing ACATS ages from different flights. Absolute accuracy of the SF6 measurement and any systematic errors in the method used to calculate mean ages are not included. Organic chlorine (CCly) was calculated from ACATS in-situ measurements of CFC-11, CFC-12, CFC-113, CH3CCl3, and CCl4. Contributions to CCly from CH3Cl and HCFC-22 (measured by WAS) were calculated from their correlations with tracers measured by ACATS. Organic bromine (CBry) was calculated from ACATS in-situ measurements of halon-1211. Contributions to CBry from CH3Br, halon-2402, halon-1301, CH2Br2, and CH2BrCl (measured by WAS) were calculated from their correlations with tracers measured by ACATS using the formula in Wamsley et al. [1997]. The total chlorine (TotalCl) and total bromine (TotalBr) content of each sampled air mass was calculated from the documented tropospheric trends of chlorinated and brominated trace gases (e.g., Montzka et al. [1996]) and weighted with a mean age spectrum calculated by Hall & Plumb [1994]. Inorganic chlorine (Cly) and inorganic bromine (Bry) were calculated as TotalCl-CCly and TotalBr-CBry, respectively. Data submitted only for air masses with potential temperature greater than 380 K. 1 GMTs Age AgeERR TotalBr CBry Bry TotalCl CCly Cly 70822 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 70892 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 70962 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 71032 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 71102 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 71172 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 71242 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 71382 1.38 0.58 19.419 9999.000 9999.000 3.404 9999.000 9999.000 71452 1.38 0.58 19.419 16.400 3.019 3.404 3.094 0.310 71522 1.97 0.55 19.331 9999.000 9999.000 3.421 9999.000 9999.000 71592 2.25 0.56 19.273 12.724 6.549 3.428 2.779 0.649 71662 2.25 0.56 19.273 9999.000 9999.000 3.428 9999.000 9999.000 71732 2.33 0.56 19.254 12.745 6.509 3.430 2.787 0.643 71802 2.82 0.53 19.123 9999.000 9999.000 3.441 9999.000 9999.000 71942 2.61 0.53 19.181 9999.000 9999.000 3.437 9999.000 9999.000 72012 2.09 0.56 19.308 12.804 6.503 3.424 2.808 0.616 72082 2.29 0.56 19.264 9999.000 9999.000 3.429 9999.000 9999.000 72222 1.70 0.55 19.376 9999.000 9999.000 3.413 9999.000 9999.000 72292 1.66 0.55 19.382 15.406 3.976 3.412 3.051 0.362 72362 1.70 0.55 19.376 9999.000 9999.000 3.413 9999.000 9999.000 72502 2.29 0.56 19.264 9999.000 9999.000 3.429 9999.000 9999.000 72572 2.98 0.54 19.073 9.308 9.765 3.445 2.415 1.029 72642 2.29 0.56 19.264 9999.000 9999.000 3.429 9999.000 9999.000 72712 3.06 0.54 19.047 8.966 10.082 3.446 2.371 1.076 72782 2.17 0.56 19.291 9999.000 9999.000 3.426 9999.000 9999.000 72852 1.97 0.55 19.331 11.983 7.348 3.421 2.747 0.673 72922 2.13 0.56 19.299 9999.000 9999.000 3.425 9999.000 9999.000 73062 2.01 0.56 19.323 9999.000 9999.000 3.422 9999.000 9999.000 73132 1.42 0.58 19.414 16.597 2.817 3.405 3.122 0.284 73202 0.73 0.57 19.529 9999.000 9999.000 3.385 9999.000 9999.000 73272 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73342 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73412 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73482 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73622 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73692 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73762 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73832 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73902 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 73972 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 74042 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 74182 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000 74252 9999.00 9999.00 9999.000 9999.000 9999.000 9999.000 9999.000 9999.000