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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 11 | Copyright
Atmos. Meas. Tech., 7, 3737-3749, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Nov 2014

Research article | 12 Nov 2014

Satellite observations of peroxyacetyl nitrate from the Aura Tropospheric Emission Spectrometer

V. H. Payne1, M. J. Alvarado2, K. E. Cady-Pereira2, J. R. Worden1, S. S. Kulawik3, and E. V. Fischer4 V. H. Payne et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
  • 2Atmospheric and Environmental Research, Lexington, Massachusetts, USA
  • 3Bay Area Environmental Research Institute, Mountain View, California, USA
  • 4Colorado State University, Fort Collins, Colorado, USA

Abstract. We present a description of the algorithm used to retrieve peroxyacetyl nitrate (PAN) concentrations from the Aura Tropospheric Emission Spectrometer (TES). We describe the spectral microwindows, error analysis, and the utilization of a priori and initial guess information provided by the GEOS-Chem global chemical transport model. The TES PAN retrievals contain up to one degree of freedom for signal. In general, the retrievals are most sensitive to PAN in the mid-troposphere. Estimated single-measurement uncertainties are on the order of 30 to 50%. The detection limit for a single TES measurement is dependent on the atmospheric and surface conditions as well as on the instrument noise. For observations where the cloud optical depth is less than 0.5, we find that the TES detection limit for PAN is in the region of 200 to 300 pptv. We show that PAN retrievals capture plumes associated with boreal burning. Retrievals over the Northern Hemisphere Pacific in springtime show spatial features that are qualitatively consistent with the expected distribution of PAN in outflow of Asian pollution.

Publications Copernicus
Short summary
Peroxyacetyl nitrate (PAN) plays an important role in the distribution of lower-atmospheric ozone. PAN can be transported far from the original pollution source, leading to ozone formation and degraded air quality in remote areas. Satellite observations from the Tropospheric Emission Spectrometer (TES) are sensitive to PAN at lower altitude than previous global data sets. We describe characteristics of the data and show elevated PAN associated with boreal fires and outflow of Asian pollution.
Peroxyacetyl nitrate (PAN) plays an important role in the distribution of lower-atmospheric...