Initial comparison of OMI NO2 columns with ground-based measurements

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Initial comparison of OMI NO2 columns with
ground-based measurements

• Edward Celarier (SGT, Inc)
• Bojan Bojkov (SSAI)
• James F. Gleason (NASA/GSFC)
• Eric Bucsela (UMBC/GEST)
• (with special thanks to Thomas Kurosu
  Harvard-SAO)

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OMI data characteristics

• OMI NO2 algorithm retrieves total column and
  tropospheric fields.
• Look-down measurements at overpass time
  (LECT13h45)
• Processing status
• On last steps toward archiving the Provisional
  Release.
• Data processed from 2004.11.01 to present.

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Ground-based data characteristics

• Variety of instruments with significant operating
  records.
• SAOZ
• DOAS
• FTIR
• Spectrometer
• Measurements made at sunrise sunset

These NDSC data are preliminary and have been
obtained through the  Envisat Cal/Val  (AOID
118) for validation purposes.
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merida
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jungfraujoch
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Izana
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Issyk-Kul
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Nairobi
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harestua
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Ohp
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La réunion
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Brewer Inst. at GSFC

• Method for measuring NO2 using a slit mask (26
  seconds to make meast), developed by A. Cede and
  Jay Herman
• Measurements can be made throughout the day.
• Slit mask results match spectral scan results.
• Uses cleanest of 102 days as reference

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gsfc
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Trop. NO2 at GSFC Jan-Mar, odlt1.5