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SCIAMACHY satellite validation during the field campaigns CINDI and TRANSBROM

SCIAMACHY satellite validation during the field campaigns CINDI and TRANSBROM. Enno Peters, Folkard Wittrock, Andreas Richter, Mark Weber and John P. Burrows ENVIVAL-LIFE Meeting Bremen, 06/07.12.2010. Outline. Introduction 1. MAX-DOAS measurements

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SCIAMACHY satellite validation during the field campaigns CINDI and TRANSBROM

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  1. SCIAMACHY satellite validation during the field campaigns CINDI and TRANSBROM Enno Peters, Folkard Wittrock, Andreas Richter, Mark Weber and John P. Burrows ENVIVAL-LIFE Meeting Bremen, 06/07.12.2010

  2. Outline • Introduction • 1. MAX-DOAS measurements • 2. Instrumentation (the ENVIVAL sponsored instrument) • II. The CINDI campaign • 1. Campaign overview • 2. Validation results (NO2, Ozone) • III. The TRANSBROM campaign • 1. Transbrom campaign overview • 2. Set up at ship, challenges • 3. Validation results (NO2, Ozone, HCHO) • IV. Summary

  3. I. Introduction

  4. MAX-DOAS measurements Multi Axis - Differential Optical Absorption Spectroscopy • Measuring spectra of scattered sunlight • Deriving trace gas columns and profiles from absorption features • High sensitivity for stratospheric absorbers during twilight ( am and pm values) Spectrometers Light Telescope unit Y-shaped optical fibre Scheme of a MAX-DOAS instrument Zenith DOAS geometry

  5. MAX-DOAS measurements Multi Axis - Differential Optical Absorption Spectroscopy • Measuring spectra of scattered sunlight • Deriving trace gas columns from absorption features • High sensitivity for stratospheric absorbers during twilight ( am and pm values) • High sensitivity for tropospheric absorbers using off-axis measurements • Converting slant columns into vertical columns/profilesusing radiative transfer models Spectrometers Light Telescope unit Y-shaped optical fibre Scheme of a MAX-DOAS instrument MAX-DOAS geometry

  6. The Bremen MAX-DOAS campaign instrument Telescope unit: Optical bank with lens and optical fiber 30x30 cm metal box mounted on Pan/Tilt Head (+- 90° elevation, +-180° azimuth, 100°/sec) Video camera Entrance window (fused silica) Shutter for dark measurements, covered with PTFE (white) for calibration HgCd line lamp for calibration

  7. The Bremen MAX-DOAS campaign instrument • Y-shaped optical fiber bundle in • UV-spectrometer: 315 – 384 nm • (0,033 nm/pixel, resolution ~ 0,4 nm) • Vis-spectrometer: 400 – 573 nm • (0,13 nm/pixel, resolution ~ 0,8 nm)

  8. II. The CINDI campaign

  9. CINDI campaign - overview Cabauw Intercomparison campaign of Nitrogen Dioxide (NO2) measuring Instruments • Participating institutes:17 • Host: KNMI (Royal Dutch Meteorological Institute) • Location: Cabauw, Netherlands • June/July 2009 • Instruments: • 22 DOAS instruments • 4 NO/NOx in situ instruments • Lidars: Aerosol, NO2, trop. O3 • meteorologic systems • several NO2 sondes launched • during campaign • From Bremen: • 1 MAX-DOAS instrument • 1 NO/NOx in situ instrument www.geomon.eu

  10. CINDI campaign - overview Location: Cabauw, Netherlands 51o 58' N   4o 55' E (semirural area) Cabauw tower (in situ instruments, meteo data) 287° ~ 43 km Elevation angle 2° Boundary Layer ~ 1.5 km 287° Remote sensing site, (DOAS instruments, Lidars)

  11. NO2 tropospheric vertical columns NO2 trop. VC June/July 09 over Cabauw MAX-DOAS SCIAMACHY (r = 50 km) GOME-2 (r = 50 km) • Time resolution: 30 min • Spatial resolution: Satellite data averaged within 50 km around site Period of (mostly) good weather (esp. June 24 & 25 “Golden Days”).

  12. NO2 tropospheric vertical columns NO2 trop. VC over Cabauw MAX-DOAS SCIAMACHY (r = 50 km) GOME-2 (r = 50 km) “Golden Day” June 25  Zoom in

  13. NO2 tropospheric vertical columns NO2 trop. Columns and ground layer (BREAM profiling) comparison at June 25, 2009 MAX-DOAS SCIAMACHY (r = 50 km) GOME-2 (r = 50 km) VMR (ppb) Trop. Col. Morning inversion In situ monitor MAX-DOAS Ground Layer (profiling) For this day (almost no clouds, sunny) MAX-DOAS is successfully closing the gap between satellite measurements (huge spatial averaging) and in situ measurements (point measurements).

  14. NO2 tropospheric vertical columns NO2 trop. VC over Cabauw MAX-DOAS SCIAMACHY (r = 50 km) GOME-2 (r = 50 km) “Golden Day” June 25  Great (by chance?) June 29  Highly dependant an location of the satellite pixel

  15. Total Ozonecolumns MAX-DOAS measurements SCIAMACHY GOME-2 Criterion for coincidence between Satellite and MAX-DOAS: Satellite pixel within 200 km around measurement site at day of respective MAX-DOAS measurements  average of these pixels

  16. Total Ozonecolumns MAX-DOAS SCIAMACHY GOME-2 Criterion for coincidence between Satellite and MAX-DOAS: Satellite pixel within 200 km around measurement site at day of respective MAX-DOAS measurements  average of these pixels

  17. III. The TRANSBROM campaign

  18. The TransBrom campaign Campaign‘s Logo RV „Sonne“ (Planned) Cruise track

  19. Set up on the ship 270° 0° x x 180° 90°  Relative winddirection between 90° and 180° is polluted (i.e. NO2)

  20. NO2 validation

  21. Total NO2 NO2 vertical columns timeseries monthly average (at ~ 10 LT) SCIAMACHY GOME-2 MAX-DOAS morning MAX DOAS evening Criterion for coincidence: Satellite pixel within 200/400 km around ship‘s position at day of respective MAX-DOAS measurement  Oct 10-12 maybe too polluted (or clean)

  22. Tropospheric NO2 NO2 DSCD (298 K, 450 – 497 nm) 2° Elevation 8° Elevation 15° Elevation (Almost) no tropospheric NO2 over open ocean • SZA < 75°, Fiterror < 20% • Reference = closest 30° elevation spectrum • ( tropospheric NO2 content)

  23. Tropospheric NO2 NO2 DSCD (298 K, 450 – 497 nm) 2° Elevation 8° Elevation 15° Elevation • SZA < 75°, Fiterror < 20% • Reference = closest 30° elevation spectrum • ( tropospheric NO2 content)

  24. Tropospheric NO2 NO2 DSCD (298 K, 450 – 497 nm) 2° Elevation 8° Elevation 15° Elevation Ship density 10.10.- 23.10.2009 • SZA < 75°, Fiterror < 20% • Reference = closest 30° elevation spectrum • ( tropospheric NO2 content) Amver-data provided by Douglas Horton, CTR US Coast Guard Operations Systems Center (personal communication), www.amver.com

  25. Tropospheric NO2 Zoom in event NO2 DSCD, Oct 10-11 Relative wind direction 2° Elevation 8° Elevation 15° Elevation • Rel. wind direction • ok during event • Positive peak • 2° higher SC than • upper elevation • Camera picture: •  Other ship‘s plume Picture from the camera in the telescope box at 10.10.2009 23:20 UT

  26. NO2 tropospheric vertical columns GOME2 trop. NO2 October 2009 NO2 trop. VC, October 10 - 12 MAX-DOAS GOME-2 (r = 150 km) SCIAMACHY (r = 150 km) monthly average (at ~ 10 LT) Detection Limit ~

  27. NO2 tropospheric vertical columns GOME2 trop. NO2 October 2009 NO2 trop. VC, October 10 - 12 MAX-DOAS GOME-2 (r = 150 km) SCIAMACHY (r = 150 km) SCIAMACHY (r = 200 km) monthly average (at ~ 10 LT) Detection Limit ~

  28. Ozone validation

  29. Total Ozonecolumns MAX-DOAS measurements SCIAMACHY GOME-2 Criterion for coincidence between Satellite and MAX-DOAS: Satellite pixel within 200 km (400 km) around ship‘s position at 10 LT at day of respective MAX-DOAS measurements  average of these pixels

  30. HCHO validation

  31. HCHO differential slant columns HCHO VCD (335 – 357 nm) Polluted region (ship traffic, influence from land) ? October 14: Sunniest day of the cruise anthropogenic, vegetation, lots of bush fires (dry season)

  32. HCHO tropospheric vertical columns HCHO VCD (335 – 357 nm) Oct 19-20 cruise track October 19 ~ 150 km October 20 Detection Limit for vertical column ~ Oct 19: HCHO transport from vegetation (rainforest)?

  33. HCHO tropospheric vertical columns HCHO from Satellite and MAX-DOAS MAX-DOAS (9-11 LT) Satellite (GOME-2) Data binned to 2°-grid. „Delay“ in MAX-DOAS increaseprobably due to bad weather at this time of the cruise.

  34. HCHO tropospheric vertical columns  obtained HCHO-column along ship track is pure background signal!

  35. Summary

  36. Summary • Validation (total Ozone,NO2 & HCHO) during 2 field campains in 2009 has been • perfomed. • CINDI campaign • SCIAMCHY and MAX-DOAS Ozone have same shape, MAX-DOAS VCs mostly • smaller than SCIAMACHY values • Loss (and recovery) of 80 DU Ozoneseen by both Satellite and MAX-DOAS • At particular days MAX-DOAS (via profiling, BREAM) is able to close the gap • between in situ point measurements and satellite(s) measurements of • tropospheric NO2 • TRANSBROM • SCIAMACHY and GOME-2 Ozone in good agreement with each other, smoothed • compared to MAX-DOAS • NO2 from SCIAMACHY and GOME-2 in good agreement with each other and • MAX-DOAS, eventropospheric NO2 • HCHO background level during whole campaign (from methane oxidation) in good • agreement with GOME-2

  37. Thank you!

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