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OWP5: SCOUT balloons (Stratosphere-Climate links with emphasis on the UTLS) Andrew Robinson

OWP5: SCOUT balloons (Stratosphere-Climate links with emphasis on the UTLS) Andrew Robinson Centre for Atmospheric Science, Cambridge University, Cambridge, UK adr22@cam.ac.uk. Cambridge Centre for Atmospheric Science Halocarbon Measurement Group

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OWP5: SCOUT balloons (Stratosphere-Climate links with emphasis on the UTLS) Andrew Robinson

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  1. OWP5: SCOUT balloons (Stratosphere-Climate links with emphasis on the UTLS) Andrew Robinson Centre for Atmospheric Science, Cambridge University, Cambridge, UK adr22@cam.ac.uk

  2. Cambridge Centre for Atmospheric Science Halocarbon Measurement Group A. D. Robinson (1), B. Gostlow (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/

  3. Content Introduction: halocarbon group Balloon options in AMMA (Summer 2006) Slow descent balloons Example results from HIBISCUS Short lived tracers with mDirac Conclusion

  4. Halocarbon group instruments DESCARTES grab samplers DIRAC in situ isothermal GC-ECD mDIRAC in situ programmed GC-ECD

  5. Balloon options in AMMA / SCOUT O3 Ballooning phase of SCOUT O3 from West Africa Summer 2006 (current plan) Two balloon flights funded (plans for at least 2 more) 3SF (3000 m3) balloons with slow night-time descent through TTL (preferred option) 10ZL (10000 m3) balloons with parachute descent from 25-30 km 3SF balloon (24 Feb 2004, Bauru, Brazil)

  6. Slow descent balloons 3SF balloon model data (courtesy: G. Letrenne, CNES) 3SF balloon flight data (13 Feb 2003, Bauru, Brazil)

  7. Example results: HIBISCUS (24 Feb 2004) Long lived tracer profile (DIRAC CFC-11) No significant drop below 430 K, 19 km (vertical transport very slow above this level?) Ozone increase begins inside the TTL Slightly higher CFC-11 values around 360 K (horizontal transport?) TTL Ozone data courtesy of Graeme Hansford

  8. Example results: HIBISCUS (TTL) Short lived tracers: more intra-flight / inter-flight variability larger gradient across TTL (except chloroform on SF2) Long lived tracer (CFC-113): low inter-flight variability near zero gradient across TTL

  9. Short lived tracers with mDirac Target short lived tracers for AMMA / SCOUT O3: Biogenic: CH3I (~7d), CHBr3 (~26d), CH2Br2 (~120d), CH3Br ? Industrial: C2HCl3 (~5d), CHCl3(~150d), C2Cl4(~100d)

  10. Conclusions AMMA / SCOUT O3 aiming for summer 2006 Slow descent balloons flights (preferred option) Two flights funded (2 more?) mDirac preferred instrument Target gases: short lived (some long lived) Lifetime range: 5 days to 80 years Acknowledgements: Many thanks to NERC, EC (HIBISCUS), TrroCCiBras

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