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Spring 2001 AGU Meeting Peroxy Radical Distribution During TOPSE and Implications for Ozone Photochemistry Christopher Cantrell and TOPSE Science Team
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Spring 2001 AGU Meeting Outline Description of CIMS peroxy radical measurements Steady-state radical concentrations Budgets of radicals and O 3 during TOPSE Possible role of photochemistry in TOPSE O 3 trends
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Spring 2001 AGU Meeting TOPSE in situ O 3
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Spring 2001 AGU Meeting TOPSE Steady State HO 2 + RO 2
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Spring 2001 AGU Meeting TOPSE Steady State OH
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Spring 2001 AGU Meeting TOPSE O( 1 D)+H 2 O Rate
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Spring 2001 AGU Meeting TOPSE Temperature
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Spring 2001 AGU Meeting CIMS HO 2 and HO 2 +RO 2 Measurements Based on conversion of ambient peroxy radicals to gas-phase H 2 SO 4 –HO 2 + NO OH + NO 2 –OH + SO 2 (O 2, H 2 O, M) H 2 SO 4 Chemical ionization – Calibration –Photolysis of water vapor by 184.9 nm radiation –Lamp flux by N 2 O actinometry
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Spring 2001 AGU Meeting CIMS Inlets, rack, C130 photos
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Spring 2001 AGU Meeting Steady-State Radical Concentrations Equation for each radical (OH, HO 2, CH 3 O 2 ) – Assume dX/dt << P or L, P-L 0 n equations and n unknowns (radical concentrations) Solve by iterative numerical method (Newton- Raphson). Requires initial estimate. Use measured quantities (NO x,CO, NMHCs, O 3, j- values, etc.) when available in equations Include HNO 4 chemistry (estimate of jHNO 4 ) Two calculations: effective CH 4, explicit treatment of NMHCs (and thus RO 2 )
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Spring 2001 AGU Meeting Comparison of measurements and steady-state HO 2 +RO 2
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Spring 2001 AGU Meeting TOPSE Measured & SS HO 2 +RO 2
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Spring 2001 AGU Meeting TOPSE SS Peroxy Radical Ratios
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Spring 2001 AGU Meeting TOPSE HOx Production & Loss
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Spring 2001 AGU Meeting TOPSE HO x Production
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Spring 2001 AGU Meeting Steady State HO 2 NO 2
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Spring 2001 AGU Meeting TOPSE Net O 3 Production and Loss
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Spring 2001 AGU Meeting TOPSE Net O 3 Production
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Spring 2001 AGU Meeting TOPSE Net O 3 Production
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Spring 2001 AGU Meeting Comparison with Other Studies
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Spring 2001 AGU Meeting Acknowledgements NCAR –ACD –RAF/ATD NSF TOPSE Colleagues Churchill Airport Thule Air Base
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