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UCAM halocarbon observations on SF balloons during HIBISCUS (2003/2004)

UCAM halocarbon observations on SF balloons during HIBISCUS (2003/2004) A. D. Robinson (1), J. D. McIntyre (1), B. Gostlow (1), J. Levine (1), N. R. P. Harris (1,2), J. A. Pyle (1,3) (1) Centre for Atmospheric Science, Cambridge University, Cambridge, UK

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UCAM halocarbon observations on SF balloons during HIBISCUS (2003/2004)

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  1. UCAM halocarbon observations on SF balloons during HIBISCUS (2003/2004) A. D. Robinson (1), J. D. McIntyre (1), B. Gostlow (1), J. Levine (1), N. R. P. Harris (1,2), J. A. Pyle (1,3) (1) Centre for Atmospheric Science, Cambridge University, Cambridge, UK (2) European Ozone Research Coordinating Unit, Cambridge, UK (3) NCAS-ACMSU, Cambridge University, Cambridge, UK adr22@cam.ac.uk http://www.atm.ch.cam.ac.uk/~halocarbon/ data also stored on NILU database

  2. Content Tracer measurement availability Long lived tracer (CFC-11) on SF4 20040224 Long and short lived tracers on SF1 20040216 TTL tracer profiles (SF1, SF2 and SF3) Conclusions

  3. Tracer measurement availability

  4. Long lived tracer profiles (DIRAC CFC-11, SF4, 20040224)

  5. Long lived tracer profiles (DIRAC CFC-11, SF4, 20040224) No significant drop below 430 K, 19 km (vertical transport very slow above this level ?) Ozone increase begins inside the TTL (local ozone lifetime much shorter than CFC-11 ?) Slightly higher CFC-11 values around 360 K (horizontal transport from equatorial region ?) TTL Ozone data courtesy of Graeme Hansford

  6. Long lived tracer profiles (DIRAC CFC-11, SF4, 20040224) TTL Strong relation between CFC-11 and ozone Ozone data courtesy of Graeme Hansford

  7. Long lived tracer profiles (DIRAC CFC-11, SF4, 20040224) TTL Low vertical gradient in CFC-11 and PV (vertically well mixed layer ?) PV plot courtesy of Alain Hauchecorne

  8. Long and short lived tracers (DESCARTES SF1, 20040216)

  9. Long and short lived tracers (DESCARTES SF1, 20040216) No significant drop in CFC-113 in TTL region (same situation as CFC-11 on SF4, 20040224) Ozone increase begins inside the TTL (local ozone lifetime much shorter than CFC-11 ?) Above background CFC-113 around 340 K, 8 - 9.5 km (also elevated CO, uplifted boundary layer air ? ) TTL Ozone data courtesy of Graeme Hansford CO data from Falcon courtesy of TROCCINOX

  10. Long and short lived tracers (DESCARTES SF1, 20040216) Clear drop in chloroform through TTL region (lifetime of air in TTL < 6 months) Ozone lifetime similar to chloroform in the TTL? Above background chloroform in addition to elevated CFC-113 TTL Ozone data courtesy of Graeme Hansford CO data from Falcon courtesy of TROCCINOX

  11. Long and short lived tracers (DESCARTES SF1, 20040216) Clear drop in dibromomethane through TTL region (lifetime of air in TTL < 3 months) Above background dibromomethane? TTL Ozone data courtesy of Graeme Hansford CO data from Falcon courtesy of TROCCINOX

  12. TTL tracer profiles (SF1, SF2 & SF3)

  13. TTL tracer profiles (SF1, SF2 & SF3) More intra-flight / inter-flight variability for short lived tracers: drop off across TTL (except chloroform on SF2) Low inter-flight variability for long lived tracers (CFC-113): zero drop off across TTL Ozone data courtesy of Graeme Hansford

  14. Conclusions The dataset:  still aiming to retrieve some short lived data Long lived tracers:  profiles all show little/no change in TTL  data relate strongly to ozone Shorter lived tracers:  much more scatter/inter-flight variability (to be expected?)  generally show substantial drop off in TTL Future:  very important to make more measurements Acknowledgements: Many thanks to all the TroCCiBras / TROCCINOX / HIBISCUS community

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