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Comprehensive Report on O3 Measurements in Tropical Upper Troposphere

Explore the latest findings from NOAA UAS O3 team regarding O3 measurements during ATTREX missions in the tropical upper troposphere (TUT). Discover the significance of O3, OH, and HOx interactions in pollutant degradation processes.

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Comprehensive Report on O3 Measurements in Tropical Upper Troposphere

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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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