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Evaluating NOx Emission Inventories in North America and Beyond

This study evaluates NOx emission inventories in North America using data from the SCIAMACHY satellite instrument. It compares top-down and bottom-up inventories and conducts GEOS-CHEM simulations to assess the accuracy of each inventory. The study also analyzes the major discrepancies in NOx emissions from megacities and explores the export of NOx from North America.

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Evaluating NOx Emission Inventories in North America and Beyond

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  1. Evaluating NOx Emission Inventories in North America and Beyond Randall Martin Aaron Van Donkelaar Yongtao Hu Armistead Russell Chris SiorisKelly Chance Tom Ryerson Bill Brune Jack Dibb Ron Cohen UC Berkeley

  2. Cloud-filtered Tropospheric NO2 Columns Observed from the SCIAMACHY Satellite Instrument (Data  ICARTT) May-Oct 2004 detection limit

  3. EMIS: Emissions Mapping Integration ScienceOptimize North American NOx Emissions SCIAMACHY NO2 Columns NOx Emissions (SMOKE/G.Tech) Aug 2004 May-Oct 2004 A priori emissions (SMOKE/Russell) 1011 molec N cm-2 s-1 1015 molecules cm-2 CMAQ GEOS-CHEM Error weighting Top-Down Emissions A posteriori emissions

  4. North American NOx Emissions (May – October)Largest Change in Northeastern US Coast GEOS-CHEM (NAPAP Scaled to 1998) SCIAMACHY (2004) SCIAMACHY - NAPAP 1011 atoms N cm-2 s-1 1011 atoms N cm-2 s-1 1011 atoms N cm-2 s-1 r2= 0.85 7.6 Tg N 0.8 Tg N 8.4 Tg N

  5. Evaluate Top-Down and Bottom-Up NOx InventoriesConduct GEOS-CHEM Simulation For Each InventorySampled GEOS-CHEM Along Flight Tracks Simulation with SCIAMACHY – Original NOx Emission Inventory NOx (ppbv) HNO3 (ppbv)

  6. P-3 Measurements Support Top-Down InventoryDC-8 Measurements Inconclusive New England New England + Gulf Remote In Situ GEOS-CHEM (Top-Down) GEOS-CHEM (Bottom-up)

  7. Major Discrepancy in NOx Emissions from Megacities 48 Tg N May-Oct 2004 48 - 38 Tg N GEIA 1998

  8. SCIAMACHY Shows Elevated NOx Export from North America SCIAMACHY NO2 (1015 molec cm-2) May-Oct 2004 GEOS-CHEM NO2 (1015 molec cm-2) May-Oct 2004

  9. Explained by Model Bias in Upper Tropospheric NOx West of -60 degrees lon, “land” East of -60 degrees lon, “ocean” GEOS-CHEM NO2 Cohen NO2 GEOS-CHEM low by factor of 2 in column GEOS-CHEM low by 7.5% in column GEOS-CHEM NO Brune NO Errorbars Show 17th and 83rd percentiles

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