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Long range transport of tropospheric NO 2 : Monitoring and Modelling

Long range transport of tropospheric NO 2 : Monitoring and Modelling. Bas Mijling Ruud Dirksen Ronald van der A. NO 2 workshop, KNMI, 10-12 September 2007. Overview. Daily monitoring of Transatlantic transport of NO 2 with the OMI instrument Tropospheric NO 2 “above the clouds”

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Long range transport of tropospheric NO 2 : Monitoring and Modelling

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  1. Long range transport of tropospheric NO2:Monitoring and Modelling Bas MijlingRuud DirksenRonald van der A NO2 workshop, KNMI, 10-12 September 2007

  2. Overview Daily monitoring of Transatlantic transport of NO2 with the OMI instrument • Tropospheric NO2 “above the clouds” • OMI collection 3 • Examples of events Global impact of the increasing Chinese NO2 emissions • Using satellite observations and model simulations to estimate anthropogenic emissions in China • Long range impact of new emissions

  3. Daily monitoring of transatlantic transport of NO2with the OMI instrument 1

  4. NO2 above the clouds troposph. NO2 column NO2 ghost column Shielding of Tropospheric NO2

  5. Cloudy (cl.rad.fr. > 50%) Clear sky (cl.rad.fr. < 50%) Combining and Gridding NO2 Data Combined Gridded on 0.5º x 0.5º

  6. Mechanisms for Long Range Transport 1. uplift 2. horizontal transport

  7. Observation vs Simulation www.temis.nl/lrt

  8. Observation vs Simulation • Height dependency • Frequency (seasonality) • Quantify transport www.temis.nl/lrt

  9. Artifacts: Clusters of high NO2 values Normal NO2 values: reflectance 22-2-2007 OMI NO2 405 nm 465 nm High NO2 values: 405 nm 465 nm 22-2-2007 MODIS

  10. Artifacts: Cross track gradient

  11. Comparison OMI Initial Column Densities Col 2 Col. 3 Test

  12. “clean”reference area Destriping Algorithm

  13. Event I: Transatlantic NO2 transport 2-12-2005 3-12-2005 4-12-2005 5-12-2005

  14. Event II: Transatlantic NO2 transport 22-12-2005 23-12-2005 24-12-2005 25-12-2005

  15. Event III: Backflow from Europe 6-2-2007 7-2-2007 8-2-2007 9-2-2007

  16. Event IV: Forest Fires on Canaries 29-7-2007 30-7-2007 31-7-2007 1-8-2007

  17. Global impact of the increasingChinese NO2 emissions 2

  18. Change in NO2 column densities over China SCIAMACHY mean tropospheric NO2 2006 2003

  19. Model simulation with TM5 • Chemistry-transport model to simulate trace gas concentrations • Zoom mode: resolve trace gas concentrations over China at 1x1°, global at 6x4° • CBM-4 chemistry scheme • Initial emission database: Edgar 3.2 (1997) • Generation of daily output at satellite overpass time (10.00am for GOME; 10.30am for SCIAMACHY)

  20. New anthropogenic NOx emission estimates needed Difference observed – modeled NO2 columns • Emission inventories based on energy consumption forecasts and statistical data;For China little data available • Large increase in anthropogenic NOx emissions in China;Emission inventories quickly outdated

  21. NOx emission estimates for China in 2003 original anthropogenic NOx emissions (EDGAR 3.2) top-down estimates of anthropogenic NOx emissions

  22. LRT mechanism with PAN NOx source remoteatmosphere

  23. Increase in PAN Model run for 2005; emissions for 1997 compared with emissions for 2005 • Higher NOx emissions lead to an increase in PAN, providing a long-range transport mechanism for NOx : 2.0% increase in global tropospheric PAN

  24. Increase in tropospheric O3 Model run for 2005; emissions for 1997 compared with emissions for 2005 • Higher emissions of NOx and hydrocarbons cause an increase in tropospheric ozone: 0.4% increase in global tropospheric ozone

  25. Summary • Satellite observations can be used to monitor long range transport of tropospheric NO2; • OMI collection 3 improves data quality; • New emission database of anthropogenic NOx for China established; • Long range effects: Increased emissions affect tropospheric O3 concentrations world wide

  26. Artifacts: Destriping side effects OMI collection 3, Destriping algorithm OMI collection 3, No destriping algorithm OMI collection 2, Destriping algorithm

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