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OMI Overview

OMI Overview. Prof. Dr. Pieternel Levelt KNMI, TUE The Netherlands. OMI Zoom mode 12x13 km 2 Mexico City and suburbs OMI NO2, January 20, 2005 Courtesy: Veefkind, KNMI. International OMI Science team PI (KNMI): P.F. Levelt dep.PI (KNMI): J.P. Veefkind co-PI (FMI) J.Tamminen

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OMI Overview

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  1. OMI Overview Prof. Dr. Pieternel Levelt KNMI, TUE The Netherlands OMI Zoom mode 12x13 km2 Mexico City and suburbs OMI NO2, January 20, 2005 Courtesy: Veefkind, KNMI

  2. International OMI Science team PI (KNMI): P.F. Levelt dep.PI (KNMI): J.P. Veefkind co-PI (FMI) J.Tamminen US ST Leader (NASA GSFC): P.K. Bhartia …. And about 60 - 80 scientists Industry Dutch: DS, TNO-TPD, SRON Finnish: VTT, Patria USA: Northrop GES USA Dutch, Finnish and US Space Agencies NIVR, FMI and NASA OMI is a Dutch-Finnish Instrument on the NASA spacecraft EOS-AuraLaunch: July 15, 2004 International OMI Team OMI is now also a third party mission from ESA Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  3. Ozone hole 2007 Dutch National Geographic November 2008 Instruments in The Netherlands Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  4. Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  5. OMI NO2 Weekly Cycle over The Netherlands Period Dec 2004 - Nov 2005, Normalized for Monday Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  6. Daily OMI Air Pollution Observations (1) Tuesday Wednesday Tropospheric NO2 for Tue-6, Wed-7, Thu-8 and Fri-9 May 2008. Image courtesy: Quintus Kleipool (KNMI) Thursday Friday Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  7. Daily OMI Air Pollution Observations (2) Saturday Sunday Tropospheric NO2 for Sat-10, Sun-11, Mon-12 and Tue-13 May 2008, including the Pentecost weekend (11-12 May). Image courtesy: Quintus Kleipool (KNMI) Monday Tuesday Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  8. Orbit choice : first data on diurnal cycle from space SCIAMACHY and OMI at resp. 10:00 and 13:30 local time overpass Courtesy: K. F. Boersma et al. Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  9. Air QualityGreek Forest fires in august 2007: enhanced aerosols, NO2 and CO from OMI and SCIAMACHY OMI aerosol (right) and NO2 (below) Greek Forest fires in august 2007: enhanced aerosols, NO2 and CO from OMI and SCIAMACHY Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  10. SO2 Mount Etna Mount Etna 13,14,15 and 16 May 2008 Carn et al. Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  11. OMI cloud “top” pressure With CloudSat, we can examine radiative transfer in realistic extended clouds and confirm the hypothesis. OMI cloud pressures MODIS cloud-top pressures Layer optical depths derived from MODIS/CloudSat. Cloud pressures simulated from these data Profile # 1 2 3 4 5 Cloudsat radar reflectivities Slide from Vassilkov, NASA GSFC. Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  12. HCHO Glyoxal Back up Trop O3 NO2 October 2005: collection 3 Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  13. Ground Based In-Situ Data • LML Dutch air quality network, www.rivm.nl/lml • Regional, City and Street stations • Mean yearly value per station for 12:00 to 14:00 hrs Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  14. Comparison with the LML Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  15. Zoom-in over France Cities of the size >100,000 habitants Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  16. Detection Limit of Tropospheric NO2 Area observed 60x30 km2 The detection limit is defined as the minimum difference in tropospheric NO2 in a yearly mean that is statistically meaningful. Smaller values are better OMI GOME-2 SCIA Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  17. Aura Spacecraft • Aura FMU anomaly • Aura rephasing • See presentation Jacques Claas today Before re-phasing OMI monthly spatial zoom-in measurements After re-phasing De Bilt Washington Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  18. Instrument and calibration status • OMI instrument is very stable • OMI operations 99,9 % • Calibration daily OPF updates for dark current corrections:Collection 3Anomalies OMI: • FMU anomalyAll mechanism commands have been adjusted • New OMI anomaly for outer swath last year • Another comparable OMI anomaly recently on around row 40 swath position For last 2 anomalies :- level 1 and 2 data are affected- potential cause is identified, but difficult to confirm- possibility correction mechanism is investigated OMI flight model See Dobber’s presentation today and tomorrow Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  19. Collection 3 Processing Summary Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  20. Validation Status COL3 Validated and Good for Science Validated and Some Problems Validated butUse with Caution Validation Preliminary Not Publicly Available Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  21. OMI – MLS Ozone Profiles Preliminary results forOMI vs MLS ozone profiles Distance < 100 kmSame orbit Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  22. Status of OMI Data Products (collection 3) KNMI OMI website: (http://www.knmi.nl/omi) Instrument and level 0-1b data processing overview: (http://www.knmi.nl/omi/research/calibration/instrument_overview) Data: NASA GSFC DISC (http://disc.gsfc.nasa.gov/Aura/OMI) NRT data: TEMIS website (http://www.temis.nl) VFD data : Very Fast Delivery(http://omivfd.fmi.fi) IEEE Aura special Issue: instrument, algorithm and first results papers (March 2006) JGR special issue: validation papers (2008) Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  23. This meeting • Main Topics: • AQ and Climate session • Validation session • OMI anomaly • Blue team review and preparation forreview in November for Aura extension: • Mark and Anne will come Wednesday • Future missions: TROPOMI Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  24. Back up Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  25. Spatial Resolution OMI Zoom 12x13 km2 OMI 24x13 km2 Mexico City January 20, 2005 Approx. GOME-2 72x39 km2 Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  26. Detection Limit Test • Assume two areas with different yearly average NO2 concentrations; • Simulate the measured NO2 assuming a variation of 100% and a cloud contamination of 50%; • Sample the simulated NO2 with a sensor with a certain spatial and temporal sampling and measurement uncertainty; • Using a statistical test at 67 and 95% confidence level, determine the minimum detectable difference. Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  27. Ozone Monitoring Instrument OMI • UV and VIS backscatter instrument (270 - 500 nm) • Wide swath telescope yields daily global maps (2600 km) • Urban scale resolution is best ever for air quality measurements from space (13 x 24 km2) Heritage: GOME, SCIAMACHY, GOMOS and TOMS OMI is now also a third party mission from ESA Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  28. First comparisons of MODIS & OMI cloud pressures: Hurricane Katrina (Joiner et al.,GRL, 2006) Some differences expected; Cloudsat data not available at the time. Spiral structure seen in OMI cloud pressures, but not in MODIS cloud-top pressure. Hypothesis: UV radiation penetrates deep inside a cloud because OMI UV channels see through high thin cirrus to lower water clouds with band structure. Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

  29. Instrument and calibration status • OMI operations 99 % • Calibration daily OPF updates for dark current corrections:Collection 3Anomalies OMI: • FMU anomalyAll OMI commands have been adjusted • New OMI anomaly for outer swath last year • Another comparable OMI anomaly recently on around row 40 swath position For last 2 anomalies :- level 1 and 2 data are affected- potential cause is identified, but difficult to confirm- possibility correction mechanism is investigatedSee Dobber’s presentation today and tomorrow OMI flight model Prof.Dr.P.F.Levelt, KNMI, TUE, June11,2008, NIVR

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