Simultaneous ground-based observations of O 3 , HCl, N 2 O, and CH 4 over Toronto, Canada by three Fourier transform spectrometers with different resolutions
By Debra Wunch, Jeffrey R. Taylor, D. Fu, P. Bernath, J. R. Drummond, C. Midwinter, K. Strong, K. Walker. 2006
608 citations recorded by the source corpus.
An intercomparison of three Fourier transform spectrometers (FTSs) with significantly different resolutions is presented. The highest-resolution instrument has a maxi- mum optical path difference of 250 cm, and the two lower- resolution instruments have maximum optical path differ- ences of 50 cm and 25 cm. The results indicate that the two lower-resolution instruments can retrieve total column amounts of O3, HCl, N2O and CH4 using the SFIT2 retrieval code with percent differences from the high-resolution in- strument generally better than 4%. Total column amounts of the stratospheric species (O3 and HCl) have larger differ- ences than those of the tropospheric species (N2O and CH4). Instrument line shape (ILS) information is found to be of critical importance when retrieving total columns of strato- spheric gases from the lower-resolution instruments. Includ- ing the ILS information in the retrievals significantly reduces the difference in total column amounts between the three in- struments. The remaining errors for stratospheric species to- tal column amounts can be attributed to the lower sensitivity of the lower-resolution FTSs to the stratosphere.
Subfields: Atmospheric Science, Global and Planetary Change, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/c0c0078a7322daaa9dd02095f489929a50656eee
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