Abstract

The principles, construction, and operation of a novel gas correlation spectrometer employing the Zeeman effect to perform selective modulation are described. The retrieval of column amounts of atmospheric nitric oxide (NO) is discussed. The sun is used as an IR source, and the radiation is modulated by the splitting of absorption lines in a sample of NO gas which is positioned in a variable longitudinal field. A sample of the results obtained at a high altitude observatory is presented. The diurnal variation in the observed NO column is consistent with photochemical predictions. Unexpected shorter term variabilities which are observed may be dynamic effects but are more likely to be instrumental artifacts. The instrument is insensitive to tropospheric NO, making it potentially useful for long term monitoring from the ground of NO in the stratosphere and mesosphere.

© 1988 Optical Society of America

Zeeman modulation contrasted with pressure modulation in its use in measuring atmospheric NO from the ground

R. L. McKenzie and Howard K. Roscoe
Appl. Opt. 27(19) 3988-3993 (1988)

Measurements of the atmospheric carbon monoxide column with a ground-based length-modulated radiometer

Boyd T. Tolton and James R. Drummond
Appl. Opt. 38(10) 1897-1909 (1999)

Radiometer for the measurement of water vapor in the upper atmosphere from space

S. B. Calcutt, T. M. Pritchard, C. L. Hepplewhite, F. W. Taylor, S. T. Werrett, E. Arijs, and D. Nevejans
Appl. Opt. 32(33) 6764-6776 (1993)

Modeling of intensity-modulated continuous-wave laser absorption spectrometer systems for atmospheric CO₂ column measurements

Bing Lin, Syed Ismail, F. Wallace Harrison, Edward V. Browell, Amin R. Nehrir, Jeremy Dobler, Berrien Moore, Tamer Refaat, and Susan A. Kooi
Appl. Opt. 52(29) 7062-7077 (2013)

Atmospheric vertical profiles of O₃, N₂O, CH₄, CCl₂F₂, and H₂O retrieved from external-cavity quantum-cascade laser heterodyne radiometer measurements

Tracy R. Tsai, Rebecca A. Rose, Damien Weidmann, and Gerard Wysocki
Appl. Opt. 51(36) 8779-8792 (2012)