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O 3 measurements during ATTREX

O 3 measurements during ATTREX . Ru-Shan Gao and t he O 3 team. NOAA UAS O3 status • Instrument performed well so far • All data are finalized • Instrument flown during SEAC 4 RS - Has since been checked out - Ready for the next ATTREX deployment.

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O 3 measurements during ATTREX

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  1. O3 measurements during ATTREX Ru-Shan Gao and the O3 team

  2. NOAA UAS O3 status • Instrument performed well so far • All data are finalized • Instrument flown during SEAC4RS - Has since been checked out - Ready for the next ATTREX deployment

  3. OH in the tropical upper troposphere (TUT) • Low concentration but important for pollutant degradation • Direct source: O3 + hn® O2 + O(1D) (R1) O(1D) + H2O ® 2OH (R2) • O3, low H2O conditions in the TUT ® Low OH? - Kley et al., Science 1996

  4. Measurements in TUT during STRAT

  5. STRAT TUT OH data

  6. O3 + hn® O2 + O(1D), O(1D) + H2O ® 2OH

  7. STRAT TUT OH data

  8. • The cycling time between OH and HO2 is much shorter than the lifetime of HOx • OH <-> HO2: OH + CO (+ O2) ®HO2 + CO2 (R3) HO2 + NO® OH + NO2 (R4) • OH is controlled by R3, R4, and HOx sources and sinks • O3+H2O is not the dominant HOx source • Main HOx sink: NOy (high NOy) or HOxself reactions (low NOy)

  9. Measurements in TUT during STRAT

  10. ATTREX O3

  11. ATTREX O3

  12. Concluding remarks: 1) NOAA UAS O3 worked well and data are finalized 2) A simple functional description for OH in the tropical upper troposhpere (TUT) is accurate to ±50% - Except for air parcels with very low NO ®low OH 3) It appears that the TUT OH has no dependence on O3 and H2O 4) Source of very low NO air parcels: • Low NO – marine boundary air (low O3 and NOy as well) • Strong convection without lightning – marine convection • Most likely place – the west Pacific warm pool • Low O3 can be an indicator of low NO and low OH!

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