Tropospheric Chemistry: Instruments

NOxCaRD instrument

NOxCaRD instrument

NOxCaRD (Nitrogen Oxides by Cavity Ring Down)

Principle of the Measurement

diode laser cavity ring down spectroscopy

Species Measured

NO, NO2, O3, NOy

Time Response / Detection Limit

1 second / 30 pptv


custom built

Field Projects

  • ACCRONIM 2009
  • CalNex 2010
  • UBWOS 2012, 2013, 2014
  • SOAS 2013
  • DISCOVER-AQ 2014
  • SONGNEX 2015
  • UWFPS 2017
  • FAST-LVOS 2017


Dorothy Fibiger, Erin McDuffie, Carrie Womack, Zach Decker, Steve Brown

Key Publications

Womack, C. C., Neuman, J. A., Veres, P. R., Eilerman, S. J., Brock, C. A., Decker, Z. C. J., Zarzana, K. J., Dubé, W. P., Wild, R. J., Wooldridge, P. J., Cohen, R. C., and Brown, S. S., Evaluation of the accuracy of thermal dissociation CRDS and LIF techniques for atmospheric measurement of reactive nitrogen species, Atmos. Meas. Tech., doi:10.5194/amt-10-1911-2017, 2017

Wild, R. J., Edwards, P. M., Dubé, W. P., Baumann, K., Edgerton, E. S., Quinn, P. K., Roberts, J. M., Rollins, A. W., Veres, P. R., Warneke, C., Williams, E. J., Yuan, B., and Brown, S. S., A measurement of total reactive nitrogen, NOy, together with NO2, NO, and O3 via Cavity Ring-down Spectroscopy, Environ. Sci. Technol., doi:10.1021/es501896w, 2014.

Fuchs, H., W. P. Dubé, B. M. Lerner, N. L. Wagner, E. J. Williams, and S. S. Brown, A sensitive and versatile detector for atmospheric NO2 and NOx based on blue diode laser cavity ring-down spectroscopy, Environmental Science & Technology, doi:10.1021/es902067h, 2009.