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Friday, December 9, 2005 AGU 2005

A multi-platform analysis of the North American reactive nitrogen budget during the ICARTT summer intensive.

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Friday, December 9, 2005 AGU 2005

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  1. A multi-platform analysis of the North American reactive nitrogen budget during the ICARTT summer intensive R C Hudman, D J Jacob, S Turquety, L Murray, S Wu, Q Liang,A Gilliland, M Avery, T H Bertram, E Browell, W Brune, R C Cohen, J E Dibb, F M Flocke, J Holloway, A Newman, X Ren, T B Ryerson, G W Sachse, H B Singh, P J Wooldridge *This work funded is by NOAA Office of Global Programs and NASA Tropospheric Chemistry Program Friday, December 9, 2005 AGU 2005

  2. GEOS-CHEM Model Assimilated Meteorological Data from GEOS: GEOS-4, 30 s-levels 2ox2.5o NOx Lightning Emissions [Price and Rind, 1992] GEOS-CHEM 3D Model of Tropospheric (Ox-NOx-VOC coupled to aerosol) Chemistry May-August 2004 NA Fire Inventory [Turquety et. al, 2005] EPA National Emissions Inventory 1999 v.1 (w/ modifications to VOCs)

  3. Observed Simulated GEOS-CHEM VS. ICARTT Mean comparison along the flight tracks O3 CO NO2 PAN HNO3 DC-8 (top) Ozone FT bias 5-10 ppbv Large UT NO2 bias WP-3 (bottom) BL bias in CO and NO2

  4. ICARTT OBSERVATIONS CONFIRM LARGE DECREASE SINCE 1999 IN INDUSTRY/POWER SOURCE MEAN(Model NOx/ Observed NOx): All DC-8 & WP-3 flts 0-2 km Large overestimate powerplant/industry dominated Midwest and in the South DC-8 Midwest Observed Simulated Improved Simulation 0 1 2 3 > 4 50% reduction in power and industry source as determined by Frost et al., [2005] improves boundary layer NOx simulation

  5. PAN BIAS: BACKGROUND or N. AMER. ENHANCEMENT? CO – PAN correlations at 8-10 km PAN discrepancy in enhancement North American Fossil Fuel tracer vs. PAN CO vs. PAN Asian Fossil Fuel CO tracer vs. PAN Modeled Observed PAN ( ppbv ) PAN correlation dominated by NA tracer PAN (ppbv)

  6. INSUFFICIENT CONVECTIVE INJECTION OF BL POLLUTION? …not likely NOx concentrations are higher in the UT than in the BL DC-8 NOx

  7. HIGH UPPER TROP NOx CO-LOCATED WITH LIGHTNING ACTIVITY DURING ICARTT Observed DC-8 NOx > 8km [ppbv NOx] National Lightning Detection Network [Gtons N July 1 –August 15, 2004]

  8. GEOS-CHEM UPDATED LIGHTNING EMISSIONS vs. NATIONAL LIGHTNING DETECTION NETWORK GEOS-Chem Standard Ltng Simulation X 4 over U.S. National Lightning Detection Network [Gtons N July 1 –August 15, 2004]

  9. OZONE COMPARISON INTEX-NA SOUTHEAST U.S. Lightning increase over the U.S. corrects ozone bias New O3 NO2 Improved ozone at surface reflects NOx emission reduction

  10. HOx COMPARISON INTEX-NA SOUTHEAST U.S. 2-3 X bias in upper tropospheric OH HO2 OH New Old Obs

  11. DECREASING OH WOULD PUT MANY THINGS INTO PLACE… ….but how do you decrease OH by X2-3? -Reducing OH would allow us to increase lightning emissions by less, thus reducing HNO3 - NOx lifetime would increase, thus fixing underestimate of NOx in upper tropospheric outflow

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