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Improvements to air mass calculations for ground-based infrared measurements

Meier, Arndt LU ; Goldman, A; Manning, PS; Stephen, TM; Rinsland, CP; Jones, NB and Wood, SW (2004) In Journal of Quantitative Spectroscopy & Radiative Transfer 83(1). p.109-113
Abstract
High-resolution ground-based infrared solar spectra are routinely recorded at the Network for the Detection of Stratospheric Change (NDSC) stations. These data sets play a key role in providing a long-term record of atmospheric composition and their links to climate change. The analysis of observed infrared spectra involves comparison to a computer-modeled atmosphere where knowledge of the air mass distribution is an essential component. This note summarises improvements made to an existing and widely used computer code (FSCATM) to perform refractive ray-tracing and calculation of the air mass distribution. Changes were made towards higher vertical resolution in the troposphere and increased numerical precision. The revised FSCATM improves... (More)
High-resolution ground-based infrared solar spectra are routinely recorded at the Network for the Detection of Stratospheric Change (NDSC) stations. These data sets play a key role in providing a long-term record of atmospheric composition and their links to climate change. The analysis of observed infrared spectra involves comparison to a computer-modeled atmosphere where knowledge of the air mass distribution is an essential component. This note summarises improvements made to an existing and widely used computer code (FSCATM) to perform refractive ray-tracing and calculation of the air mass distribution. Changes were made towards higher vertical resolution in the troposphere and increased numerical precision. The revised FSCATM improves the analysis of infrared spectra mostly through the more accurate representation of the temperature profile. Air mass differences with respect to earlier versions are documented and are typically <0.7%, exceptions being extreme cases of inversion layers. The current version provides ray tracing and air mass calculations for any terrestrial observation site. The output files are reported in a format compatible with the SFIT and SFIT2 retrieval algorithms, which are widely used for NDSC infrared atmospheric studies. The improved computer code, documentation, reference profiles, and test cases are available electronically. Published by Elsevier Ltd. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Quantitative Spectroscopy & Radiative Transfer
volume
83
issue
1
pages
109 - 113
publisher
Elsevier
external identifiers
  • wos:000185556000007
  • scopus:0141992655
ISSN
0022-4073
DOI
10.1016/S0022-4073(02)00018-3
language
English
LU publication?
no
id
0b998a31-17bf-46bb-9b12-0cdc80f0a8db (old id 3562941)
date added to LUP
2013-03-11 08:15:43
date last changed
2017-01-01 07:04:33
@article{0b998a31-17bf-46bb-9b12-0cdc80f0a8db,
  abstract     = {High-resolution ground-based infrared solar spectra are routinely recorded at the Network for the Detection of Stratospheric Change (NDSC) stations. These data sets play a key role in providing a long-term record of atmospheric composition and their links to climate change. The analysis of observed infrared spectra involves comparison to a computer-modeled atmosphere where knowledge of the air mass distribution is an essential component. This note summarises improvements made to an existing and widely used computer code (FSCATM) to perform refractive ray-tracing and calculation of the air mass distribution. Changes were made towards higher vertical resolution in the troposphere and increased numerical precision. The revised FSCATM improves the analysis of infrared spectra mostly through the more accurate representation of the temperature profile. Air mass differences with respect to earlier versions are documented and are typically &lt;0.7%, exceptions being extreme cases of inversion layers. The current version provides ray tracing and air mass calculations for any terrestrial observation site. The output files are reported in a format compatible with the SFIT and SFIT2 retrieval algorithms, which are widely used for NDSC infrared atmospheric studies. The improved computer code, documentation, reference profiles, and test cases are available electronically. Published by Elsevier Ltd.},
  author       = {Meier, Arndt and Goldman, A and Manning, PS and Stephen, TM and Rinsland, CP and Jones, NB and Wood, SW},
  issn         = {0022-4073},
  language     = {eng},
  number       = {1},
  pages        = {109--113},
  publisher    = {Elsevier},
  series       = {Journal of Quantitative Spectroscopy & Radiative Transfer},
  title        = {Improvements to air mass calculations for ground-based infrared measurements},
  url          = {http://dx.doi.org/10.1016/S0022-4073(02)00018-3},
  volume       = {83},
  year         = {2004},
}