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D. Kinnison, J. Gille, V. Yudin, C. Randall, R. Garcia, and the entire HIRDLS Science Team

Evaluation of the Whole Atmosphere Community Climate Model Distributions of HNO 3 : A Comparison with HIRDLS Observations. D. Kinnison, J. Gille, V. Yudin, C. Randall, R. Garcia, and the entire HIRDLS Science Team HIRDLS Science Team Meeting Oxford 26 June 2008. dkin@ucar.edu 303-497-1469.

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D. Kinnison, J. Gille, V. Yudin, C. Randall, R. Garcia, and the entire HIRDLS Science Team

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  1. Evaluation of the Whole Atmosphere Community Climate Model Distributions of HNO3: A Comparison with HIRDLS Observations D. Kinnison, J. Gille, V. Yudin, C. Randall, R. Garcia, and the entire HIRDLS Science Team HIRDLS Science Team Meeting Oxford 26 June 2008. dkin@ucar.edu 303-497-1469 WACCM

  2. Simple Goal… • To show the usefulness of HIRDLS HNO3observation for the evaluation of chemical composition and transport processes in 3D chemistry climate models - specifically in the extra tropics, lower stratosphere.

  3. Outline… • Briefly Discuss the HIRDLS HNO3 data product • Show years 2006 and 2007 “binned” results. • Briefly discuss the NCAR chemistry climate model. • Highlighting the HNO3 chemistry. • Show validation of HIRDLS HNO3 in polar LS. • Show model/observation comparisons of the evolution of HNO3 • Focus mainly on the lower stratosphere.

  4. HIRDLS HNO3 Data • EOS Aura HIRDLS Instrument Details… • Sun-synchronous near polar orbit; Jan 2005 – March 2008. • 5000-7000 HNO3 profiles per day; 64°S to 80°N • HNO3 data is generally good between 100-10hPa • In the UTLS region, profiles can have useful information down to 200-300 hPa (<50% contribution for a priori). • HNO3 retrieved vertical resolution is in the 1-2 km range in the UTLS region. • Individual profile precision is in the 10-15% range. • HIRDLS HNO3 (v2.04.09) is bias 0-20% low relative to MLS (v2.2) • HIRDLS HNO3 is bias 10-30% low relative to ACE-FTS. Kinnison, D. E., et al. (2007), Sensitivity of chemical tracers to meteorological parameters in the MOZART-3 chemical transport model, J. Geophys. Res., 112, D20302, doi:10.1029/2006JD007879.

  5. Filaments in the UTLS Region Latitude height comparison of NCEP GFS and HIRDLS O3 and HNO3 data products. White lines are horizontal wind contours. Black line is 2 PV contour. Dashed Black Line is tropopause height. Blue dashed line is the 400 K contour. Kinnison, et al., accepted, JGR, Global observations of HNO3 from HIRDLS - First Results

  6. Level-2 Binned Data Product • Version 2.04.19 (interim data product) • Improved cloud detection algorithms. • Uses GEOS-5 (instead of GEOS-4) in the retrieval system. • Improvements in representing the open area fraction. • Binned HIRDLS years 2006 and 2007 • 5° latitude x 20° longitude grid. • A priori contribution ≤50%.

  7. HIRDLS HNO3 at 26 hPa

  8. Overworld HIRDLS HNO3 at 91 hPa

  9. Middleworld HIRDLS HNO3 at 147 hPa

  10. Used in decadal and longer simulations NCAR Community Climate System Model + Atmosphere CAM3 (WACCM3) Ocean Sea Ice Land

  11. WACCM3 Model Description

  12. HNO3 Chemistry / Sources in WACCM • Production: • NO2 + OH + M => HNO3 + M • N2O5 + H2O (on aerosol) => 2HNO3 (12 reactions) • CH2O + NO3 => CO + HO2 + HNO3 • Auroral Production (of NOx) in the MLT region. • Lightning production (of NOx) in the troposphere. • Loss: • HNO3 + hv => NO2 + OH • HNO3 + OH => NO3 + H2O • Wet deposition in the troposphere

  13. HNO3Chemical Lifetime in days…(Burden / Loss Rate) 20 days 10 days 20 days 10 days

  14. ACE-FTS / HIRDLS Coincidences NH Comparisons 2-hour coincidence criterion NH Latitudes:43ºN – 80ºN SH Latitudes:35ºS – 63ºS Dates:20050709 to 20080314 Max # Coincidences:1367 Courtesy of C.Randall

  15. HNO3 (ppbv) 400 K ** January ** 2.5 PVU PV and Θ for HIRDLS figures use GEOS-4 met data. “Overworld” “Middleworld” “Troposphere”

  16. HNO3 (ppbv) OW ** April ** MW OW MW

  17. HNO3 (ppbv) OW ** July ** MW OW MW

  18. HNO3 (x 1033 molecules) HIRDLS; WACCM3 HIRDLS; WACCM3 10N-70N; 2.5PVU - 400K 10N-70N; 80hPa - 400K

  19. HNO3 (x 1033 molecules) HIRDLS; WACCM3 HIRDLS; WACCM3 10N-50N; 2.5PVU - 400K 10N-50N; 80hPa - 400K

  20. HNO3 (x 1033 molecules) HIRDLS; WACCM3 HIRDLS; WACCM3 10N-50N; 2.5PVU - 400K 10N-50N; 80hPa - 400K Expanded Y-axis

  21. HNO3 (x 1033 molecules) HIRDLS; WACCM3 HIRDLS; WACCM3 50N-75N; 2.5PVU - 400K 50N-75N; 80hPa - 400K

  22. Summary • HIRDLS HNO3was used to evaluate HNO3 derived by WACCM in the NH lower stratosphere (middleworld and overworld). • Here the abundance of HNO3 is controlled by transport processes (Lifetime is 10-20 days). • NH middleworld: Model / observations show a similar seasonal magnitude and amplitude (10-75N region). Between 10-50N the seasonal amplitude is similar, however model peaked earlier in spring. • NH overworld: Model (for this one year) has 30% more HNO3 in winter than HIRDLS obs. In NH summer, HIRDLS HNO3 is larger by about 40%. The observations have smaller seasonal amplitude than model.

  23. Next Step • Need a more detailed validation of HIRDLS HNO3 in the UTLS region (e.g., MIPAS, MLS, ACE-FTS, Aircraft) to verify that the season evolution of the this region is useful for process oriented model evaluation studies. • Need to run WACCM with specified meteorological fields for more direct comparisons with HIRDLS data for a given year. • A new version of the HIRDLS HNO3 data product will be released in Fall 2008.

  24. The End

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