1 / 15

Measurements of SO 2 and HO 2 NO 2 with a Chemical Ionization Mass Spectrometer During INTEX-A

G. Huey, S. Kim, R. Stickel, D. Tanner and INTEX Science Team. Measurements of SO 2 and HO 2 NO 2 with a Chemical Ionization Mass Spectrometer During INTEX-A. Outline. SO 2 (brief) Profile Tracing Sources HO 2 NO 2 Properties Steady State Analysis. SO 2 Altitude Profile.

justin
Télécharger la présentation

Measurements of SO 2 and HO 2 NO 2 with a Chemical Ionization Mass Spectrometer During INTEX-A

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. G. Huey, S. Kim, R. Stickel, D. Tanner and INTEX Science Team Measurements of SO2 and HO2NO2 with a Chemical Ionization Mass Spectrometer During INTEX-A

  2. Outline • SO2 (brief) • Profile • Tracing Sources • HO2NO2 • Properties • Steady State Analysis

  3. SO2 Altitude Profile

  4. HO2NO2 Formation HO2 + NO2→ HO2NO2k1 Losses 1) Thermal Decomposition – Strong Function of Temperature HO2NO2→ HO2 + NO2k-1 2) Reaction with OH OH + HO2NO2→ H2O + O2 + NO2 k2 3) Photolysis – Both UV and IR (overtone) J HO2NO2+ hν → HOx + NOx

  5. Altitude Profile of HO2NO2 Lifetime for INTEX - A Above 7 km lifetime is dominated by OH and J 6-8 hours Below 7 km lifetime is dominated by thermal decomp. < 3 hours

  6. Measured HO2NO2 –INTEX-A Pernitric peaks at ~9 km with average of 77 pptv

  7. Steady State HO2NO2 SS approximation should be valid at least at lower altitudes.

  8. SS vs. Measured HO2NO2Measured HOx – Filtered Data Correlation driven by higher T, low altitude data

  9. SS – Measured HOx and T>250 K

  10. Altitude Profile w/ measured HOx

  11. Correlation w/ Langley 24 hour Model

  12. SS vs. Measured HO2NO2Langley Model HOx – Filtered Data

  13. Altitude Profile w/ Langley Model HOx

  14. Conclusions • SO2 good marker for coal burning, etc. – need help from transport models to analyze • Pernitric data is consistent with measured HOx and NOx at lower altitudes where thermal decomposition dominates • At all altitudes HO2NO2 data is consistent with measured NO2 and model HOx. • HO2NO2 is a good test of photochemistry above 8 km. Depends on both HO2 and OH. • Other issues to investigate HO2NO2 interaction with cirrus cloud, ratio of HO2NO2 to HNO3 as an indicator of air mass age, HO2NO2 as a marker for ozone production, evaluate magnitude of HO2NO2 as HOx sink, etc.

  15. Cautions • J value is not well constrained – Could it be a factor of 2 higher? • Steady State analysis is certainly imperfect • All model results based on inferred NO – Impacts HO2 to OH ratio

More Related