Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions
An intercomparison of three Fourier transform spectrometers (FTSs) with significantly different resolutions is presented. The highest-resolution instrument has a maximum optical path difference of 250 cm, and the two lower-resolution instruments have maximum optical path differences of 50 cm and 25...
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Series: | Atmospheric Chemistry and Physics |
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doaj-84272dc63bd8475bbe9e5fbd8aebce742020-11-25T01:21:21ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242007-01-017512751292Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutionsD. WunchJ. R. TaylorD. FuP. BernathP. BernathJ. R. DrummondJ. R. DrummondC. MidwinterK. StrongK. A. WalkerK. A. WalkerAn intercomparison of three Fourier transform spectrometers (FTSs) with significantly different resolutions is presented. The highest-resolution instrument has a maximum optical path difference of 250 cm, and the two lower-resolution instruments have maximum optical path differences of 50 cm and 25 cm. The results indicate that the two lower-resolution instruments can retrieve total column amounts of O<sub>3</sub>, HCl, N<sub>2</sub>O and CH<sub>4</sub> using the SFIT2 retrieval code with percent differences from the high-resolution instrument generally better than 4%. Total column amounts of the stratospheric species (O<sub>3</sub> and HCl) have larger differences than those of the tropospheric species (N<sub>2</sub>O and CH<sub>4</sub>). Instrument line shape (ILS) information is found to be of critical importance when retrieving total columns of stratospheric gases from the lower-resolution instruments. Including the ILS information in the retrievals significantly reduces the difference in total column amounts between the three instruments. The remaining errors for stratospheric species total column amounts can be attributed to the lower sensitivity of the lower-resolution FTSs to the stratosphere.http://www.atmos-chem-phys.net/7/1275/2007/acp-7-1275-2007.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. Wunch J. R. Taylor D. Fu P. Bernath P. Bernath J. R. Drummond J. R. Drummond C. Midwinter K. Strong K. A. Walker K. A. Walker |
spellingShingle |
D. Wunch J. R. Taylor D. Fu P. Bernath P. Bernath J. R. Drummond J. R. Drummond C. Midwinter K. Strong K. A. Walker K. A. Walker Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions Atmospheric Chemistry and Physics |
author_facet |
D. Wunch J. R. Taylor D. Fu P. Bernath P. Bernath J. R. Drummond J. R. Drummond C. Midwinter K. Strong K. A. Walker K. A. Walker |
author_sort |
D. Wunch |
title |
Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions |
title_short |
Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions |
title_full |
Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions |
title_fullStr |
Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions |
title_full_unstemmed |
Simultaneous ground-based observations of O<sub>3</sub>, HCl, N<sub>2</sub>O, and CH<sub>4</sub> over Toronto, Canada by three Fourier transform spectrometers with different resolutions |
title_sort |
simultaneous ground-based observations of o<sub>3</sub>, hcl, n<sub>2</sub>o, and ch<sub>4</sub> over toronto, canada by three fourier transform spectrometers with different resolutions |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2007-01-01 |
description |
An intercomparison of three Fourier transform spectrometers (FTSs) with significantly different resolutions is presented. The highest-resolution instrument has a maximum optical path difference of 250 cm, and the two lower-resolution instruments have maximum optical path differences of 50 cm and 25 cm. The results indicate that the two lower-resolution instruments can retrieve total column amounts of O<sub>3</sub>, HCl, N<sub>2</sub>O and CH<sub>4</sub> using the SFIT2 retrieval code with percent differences from the high-resolution instrument generally better than 4%. Total column amounts of the stratospheric species (O<sub>3</sub> and HCl) have larger differences than those of the tropospheric species (N<sub>2</sub>O and CH<sub>4</sub>). Instrument line shape (ILS) information is found to be of critical importance when retrieving total columns of stratospheric gases from the lower-resolution instruments. Including the ILS information in the retrievals significantly reduces the difference in total column amounts between the three instruments. The remaining errors for stratospheric species total column amounts can be attributed to the lower sensitivity of the lower-resolution FTSs to the stratosphere. |
url |
http://www.atmos-chem-phys.net/7/1275/2007/acp-7-1275-2007.pdf |
work_keys_str_mv |
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