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Comparison of Column Ozone from OMI with Ground-based Measurements at Three USA Sites

Comparison of Column Ozone from OMI with Ground-based Measurements at Three USA Sites. Bigyani Das and Phil Durbin Adnet Systems Inc./GSFC. Overview. Question: How do OMI ozone column data compare with ground-based instruments? Answer: OMI data does compare well

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Comparison of Column Ozone from OMI with Ground-based Measurements at Three USA Sites

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  1. Comparison of Column Ozone from OMI with Ground-based Measurements at Three USA Sites Bigyani Das and Phil Durbin Adnet Systems Inc./GSFC OMI Science Team Meeting, Helsinki, June 24-27, 2008

  2. Overview • Question:How do OMI ozone column data compare with ground-based instruments? • Answer: OMI data does compare well • Method: 3 USA Sites – Houston, Bondville, Raleigh Ground-based Instruments • USDA (UV network) • NOAA-EPA (NewBrew) • Results: Daily Column Ozone, Monthly Averages, Bias – All Sky Conditions, Year 2007 (All), 2005-2007 (Bondville & Raleigh versus USDA) Average Bias (%) Table for 2007 [ Bias =1/n ∑(OMI-GB)/GB * 100 ] OMI Science Team Meeting, Helsinki, June 24-27, 2008

  3. Ground Based Instruments • USDA UV-B Monitoring and Research Program (UV-MFRSR) – Ultraviolet Multifilter Rotating Shadow-band Radiometer • NewBrew - NOAA-EPA Brewer UV and Ozone network (Brewer MkIV Spectrophotometer) Measurement Sites • Houston, TX (Lat: 29.718 N, Lon: 95.341 W) • Bondville, IL (Lat: 40.053 N, Lon: 88.372 W) • Raleigh, NC (Lat: 35.728 N, Lon: 78.68 W) OMI Science Team Meeting, Helsinki, June 24-27, 2008

  4. Houston – Lat: 29.718(N), Lon: 95.341(W) OMI Science Team Meeting, Helsinki, June 24-27, 2008

  5. Bondville, IL – Lat: 40.053 (N), Lon: 88.372(W) OMI Science Team Meeting, Helsinki, June 24-27, 2008

  6. Raleigh, NC - Lat: 35.728(N), Lon: 78.68(W) OMI Science Team Meeting, Helsinki, June 24-27, 2008

  7. Bias Comparison OMI Science Team Meeting, Helsinki, June 24-27, 2008

  8. Bias Comparison: 2005-2007 OMI Science Team Meeting, Helsinki, June 24-27, 2008

  9. Summary • Daily Column Ozone values show good agreement with ground-based measurements • The bias values are site dependent • Maximum bias and average bias have different characteristics. • Maximum bias is less with NewBrew data than USDA data at all 3 sites. • Maximum bias is more at Bondville and Houston than Raleigh when compared with USDA– Reason ? OMI Science Team Meeting, Helsinki, June 24-27, 2008

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