1 / 27

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”

hagen
Télécharger la présentation

Long range transport of tropospheric NO 2 : Monitoring and Modelling

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. 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

More Related