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Formaldehyde columns from the Ozone Monitoring Instrument: Urban versus background levels and evaluation using

Nicholas L Boeke1, Julian D Marshall1, Sergio Alvarez2

  • 1Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, USA.

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|March 15, 2021
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Summary

Satellite formaldehyde (HCHO) measurements from OMI show good agreement with aircraft and model data, validating their use for tracking HCHO pollution from local to regional scales.

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Area of Science:

  • Atmospheric Chemistry and Air Quality
  • Remote Sensing and Satellite Observations
  • Environmental Modeling

Background:

  • Formaldehyde (HCHO) is a key air pollutant and indicator of atmospheric oxidation.
  • Satellite retrievals of HCHO columns (ΩHCHO) offer broad spatial coverage but require validation.
  • Understanding HCHO sources (biogenic vs. anthropogenic) is crucial for air quality management.

Purpose of the Study:

  • To evaluate formaldehyde column retrievals from the Ozone Monitoring Instrument (OMI).
  • To assess the capability of OMI HCHO data to capture variability across different scales and regimes.
  • To compare satellite-derived HCHO with aircraft measurements and a 3-D chemical transport model.

Main Methods:

  • Combined aircraft measurements (e.g., TXAQ, MLO, TXIC) over North America and the Pacific.
  • Utilized the GEOS-Chem 3-D chemical transport model for atmospheric simulations.
  • Evaluated Ozone Monitoring Instrument (OMI) formaldehyde column (ΩHCHO) retrievals against in-situ and model data.

Main Results:

  • OMI ΩHCHO showed good correlation (R=0.80) with aircraft and GEOS-Chem derived columns.
  • OMI exhibited a mean bias of -3% relative to aircraft and -8% relative to GEOS-Chem, within expected uncertainties.
  • OMI detected smaller anthropogenic HCHO gradients at finer spatial scales (20-200 km) near urban areas.

Conclusions:

  • OMI formaldehyde column retrievals are a reliable tool for assessing HCHO across local to regional scales.
  • Satellite data effectively capture HCHO variability, with biogenic sources dominating regional patterns.
  • Anthropogenic HCHO contributions are discernible at finer scales, particularly around urban centers.