Bigyani Das and Phil Durbin Adnet Systems Inc./GSFC 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
OMI Science Team Meeting, Helsinki, June 24-27, 2008 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 ] USDA-TOMS USDA-DOAS NewBrew-TOMS NewBrew-DOAS Houston 3.49 3.45 -1.06 -1.03 Bondville 0.31 0.93 0.62 1.27 Raleigh 4.0 4.18 -4.38 -4.20 OMI Science Team Meeting, Helsinki, June 24-27, 2008
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
Houston – Lat: 29.718(N), Lon: 95.341(W) OMI Science Team Meeting, Helsinki, June 24-27, 2008
Bondville, IL – Lat: 40.053 (N), Lon: 88.372(W) OMI Science Team Meeting, Helsinki, June 24-27, 2008
Raleigh, NC - Lat: 35.728(N), Lon: 78.68(W) OMI Science Team Meeting, Helsinki, June 24-27, 2008
OMI Science Team Meeting, Helsinki, June 24-27, 2008 Bias Comparison OMI Science Team Meeting, Helsinki, June 24-27, 2008
OMI Science Team Meeting, Helsinki, June 24-27, 2008 Bias Comparison: 2005-2007 OMI Science Team Meeting, Helsinki, June 24-27, 2008
OMI Science Team Meeting, Helsinki, June 24-27, 2008 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