References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-11-963-2011

Diurnal variation of midlatitudinal NO3 column abundance over table mountain facility, California

Chen

C. M.

¹ ³ Cageao

R. P.

¹ ⁴ Lawrence

² ⁵ Stutz

² Salawitch

R. J.

¹ ⁶ Jourdain

¹ ⁷ Li

¹ ² Sander

S. P.

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

University of California, Los Angeles, California, USA

now at: Potsdam Institute for Climate Impact Research, Potsdam, Germany

now at: NASA Langley Research Center, Hampton, Virginia, USA

now at: California Air Resources Board, Sacramento, California, USA

now at: University of Maryland, College Park, Maryland, USA

now at: Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, Université d'Orléans/CNRS, France

02 02 2011

11 3 963 978

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/11/963/2011/acp-11-963-2011.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/963/2011/acp-11-963-2011.pdf

The column abundance of NO3 was measured over Table Mountain Facility, CA (34.4° N, 117.7° W) from May 2003 through September 2004, using lunar occultation near full moon with a grating spectrometer. The NO3 column retrieval was performed with the differential optical absorption spectroscopy (DOAS) technique using both the 623 and 662 nm NO3 absorption bands. Other spectral features such as Fraunhofer lines and absorption from water vapor and oxygen were removed using solar spectra obtained at different airmass factors. We observed a seasonal variation, with nocturnally averaged NO3 columns between 5−7 × 1013 molec cm−2 during October through March, and 5−22 × 1013 molec cm−2 during April through September. A subset of the data, with diurnal variability vastly different from the temporal profile obtained from one-dimensional stratospheric model calculations, clearly has boundary layer contributions; this was confirmed by simultaneous long-path DOAS measurements. However, even the NO3 columns that did follow the modeled time evolution were often much larger than modeled stratospheric partial columns constrained by realistic temperatures and ozone concentrations. This discrepancy is attributed to substantial tropospheric NO3 in the free troposphere, which may have the same time dependence as stratospheric NO3.

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