Tropospheric Chemistry: Instruments

NOyO3 instrument in lab

NOyO3 instrument set up for tests in the laboratory.

Nitrogen Oxides and Ozone (NOyO3)

Principle of the Measurement

  • NO – ozone-induced chemiluminescence
  • NO2 – UV photolysis to NO; ozone-induced chemiluminescence
  • NOy – catalytic conversion to NO; ozone-induced chemiluminescence
  • O3 – nitric oxide-induced chemiluminescence

Species Measured

Nitrogen oxides (NOy), ozone (O3)

Time Response

1 Hz


custom built

Field Projects

  • SOS 1995
  • STERAO 1996
  • NARE 1996
  • SOS 1999
  • TexAQS 2000
  • ITCT 2002
  • ICARTT 2004
  • TexAQS 2006
  • ARCPAC 2008
  • CalNex 2010
  • SENEX 2013
  • SONGNEX 2015


Chelsea Thompson, Steve Sjostedt, Tom Ryerson

Key Publications

Pollack, I. B., B. M. Lerner, T. B. Ryerson, Evaluation of ultraviolet light-emitting diodes for detection of atmospheric NO2 by photolysis - chemiluminescence, Journal of Atmospheric Chemistry, doi:10.1007/s10874-011-9184-3, 2011.

Ryerson, T. B., M. Trainer, W. M. Angevine, C. A. Brock, R. W. Dissly, F. C. Fehsenfeld, G. J. Frost, P. D. Goldan, J. S. Holloway, G. Hübler, R. O. Jakoubek, W. C. Kuster, J. A. Neuman, D. K. Nicks Jr., D. D. Parrish, J. M. Roberts, D. T. Sueper, E. L. Atlas, S. G. Donnelly, F. Flocke, A. Fried, W. T. Potter, S. Schauffler, V. Stroud, A. J. Weinheimer, B. P. Wert, C. Wiedinmyer, R. J. Alvarez, R. M. Banta, L. S. Darby, C. J. Senff, Effect of petrochemical industrial emissions of reactive alkenes and NOx on tropospheric ozone formation in Houston, Texas. Journal of Geophysical Research-Atmospheres, doi:10.1029/2002JD003070, 2003.

Ryerson, T. B., M. Trainer, J. S. Holloway, D. D. Parrish, L. G. Huey, D. T. Sueper, G. J. Frost, S. G. Donnelly, S. Schauffler, E. L. Atlas, W. C. Kuster, P. D. Goldan, G. Hübler, J. F. Meagher, F. C. Fehsenfeld, Observations of ozone formation in power plant plumes and implications for ozone control strategies, Science, doi:10.1126/science.1058113, 2001.

Ryerson, T. B., E. J. Williams, and F.C. Fehsenfeld, An efficient photolysis system for fast-response NO2 measurements, Journal of Geophysical Research-Atmospheres, doi:10.1029/2000JD900389, 2000.

Ryerson, T. B., L. G. Huey, K. Knapp, J. A. Neuman, D. D. Parrish, D. T. Sueper, F. C. Fehsenfeld, Design and initial characterization of an inlet for gas-phase NOy measurements from aircraft, Journal of Geophysical Research-Atmospheres, doi:10.1029/1998JD100087, 1999.