Tropospheric Chemistry: Instruments

Nitric Acid (HNO3) CIMS


HNO3 instrument in aircraft
HNO3 instrument (left) mounted in NOAA WP-3D aircraft

Principle of the Measurement

Chemical Ionization Mass Spectrometry (CIMS) using I- or SiF5- ion chemistry

Species Measured


Time Response

1 Second

Detection Limit

Precision on 1s HNO3 data: 20 pptv (1 sigma)


±(20% + 40 pptv)

Field Projects / Platforms


Andy Neuman

Key Publications

Neuman, J. A., M. Trainer, K. C. Aikin, W. M. Angevine, J. Brioude, S. S. Brown, J. A. de Gouw, W. P. Dubé, M. Graus, J. H. Flynn, J. S. Holloway, B. L. Lefer, P. Nedelec, J. B. Nowak, D. D. Parrish, I. B. Pollack, J. M. Roberts, T. B. Ryerson, H. Smit, V. Thouret, and N. L. Wagner, Observations of ozone transport from the free troposphere to the Los Angeles basin, J. Geophys. Res., doi:10.1029/2011JD016919, 2012.

Neuman, J. A., J. B. Nowak, L. G. Huey, J . B. Burkholder, J. E. Dibb, J. S. Holloway, J. Liao, J. Peischl, J. M. Roberts, T. B. Ryerson, E. Scheuer, H. Stark, R. E. Stickel, D. J. Tanner, and A. Weinheimer, Bromine measurements in ozone depleted air over the Arctic Ocean, Atmos. Chem. Phys., doi:10.5194/acp-10-6503-2010, 2010.

Neuman, J. A., T. B. Ryerson, L. G. Huey, R. Jakoubek, J. B. Nowak, C. Simons, and F. C. Fehsenfeld, Calibration and evaluation of nitric acid and ammonia permeation tubes by UV optical absorption, Environ. Sci. Technol., doi:10.1021/ES06422L, 2003.

Neuman, J. A., L. G. Huey, R. W. Dissly, F. C. Fehsenfeld, F. Flocke, J. C. Holecek, J. S. Holloway, G. Hübler, R. Jakoubek, D. K. Nicks Jr., D. D. Parrish, T.B. Ryerson, D. T. Sueper, and A. J. Weinheimer, Fast-response airborne in situ measurements of HNO3 during the Texas 2000 Air Quality Study, J. Geophys. Res., doi:10.1029/2001JD001437, 2002.