Advanced

Evidence of reduced measurement uncertainties from an FTIR instrument intercomparison at Kiruna, Sweden

Meier, Arndt LU ; Paton-Walsh, C; Bell, W; Blumenstock, T; Hase, F; Goldman, A; Steen, A; Kift, R; Woods, P and Kondo, Y (2005) In Journal of Quantitative Spectroscopy & Radiative Transfer 96(1). p.75-84
Abstract
We report the results of an intercomparison of vertical column amounts of HCl, HF, N(2)O, HNO(3), CH(4), O(3), CO(2) and N(2) derived from the spectra recorded by two ground-based FTIR spectrometers operated side-by-side using the sun as a source. The procedures used to record spectra and derive vertical column amounts followed the format of previous instrument intercomparisons organised by the Network for Detection of Stratospheric Change (NDSC), but the level of agreement achieved was significantly better than for previous intercomparisons. For most gases the differences were typically 1% or less, with at least one of the five datasets showing no statistically significant difference between the results from different instruments.... (More)
We report the results of an intercomparison of vertical column amounts of HCl, HF, N(2)O, HNO(3), CH(4), O(3), CO(2) and N(2) derived from the spectra recorded by two ground-based FTIR spectrometers operated side-by-side using the sun as a source. The procedures used to record spectra and derive vertical column amounts followed the format of previous instrument intercomparisons organised by the Network for Detection of Stratospheric Change (NDSC), but the level of agreement achieved was significantly better than for previous intercomparisons. For most gases the differences were typically 1% or less, with at least one of the five datasets showing no statistically significant difference between the results from different instruments. Principal exceptions were HNO(3) and CO(2) when measured on the Mercury Cadmium Telluride (MCT) detectors. For these gases differences of between 2% and 3% were more typical. We present evidence that these larger differences are due to the effects of detector non-linearity and show that by applying an established non-linearity correction method the typical level of agreement can be improved to better than 1% for these gases. We suggest that the improved level of agreement achieved during this intercomparison is indicative of the current state of the art within the NDSC infra-red working group and is a result of improved understanding of the importance of critical alignment parameters and newly developed techniques to characterise the spectrometers' performance. (c) 2005 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
FTIR, intercomparison, atmospheric spectroscopy, trace gases, remote, sensing
in
Journal of Quantitative Spectroscopy & Radiative Transfer
volume
96
issue
1
pages
75 - 84
publisher
Elsevier
external identifiers
  • wos:000229870700005
  • scopus:21044445749
ISSN
0022-4073
DOI
10.1016/j.jqsrt.2005.02.001
language
English
LU publication?
no
id
ba2be5fe-a67f-4c9d-a6cd-d31aca9cad2c (old id 3562919)
date added to LUP
2013-03-11 08:16:48
date last changed
2017-01-01 06:37:10
@article{ba2be5fe-a67f-4c9d-a6cd-d31aca9cad2c,
  abstract     = {We report the results of an intercomparison of vertical column amounts of HCl, HF, N(2)O, HNO(3), CH(4), O(3), CO(2) and N(2) derived from the spectra recorded by two ground-based FTIR spectrometers operated side-by-side using the sun as a source. The procedures used to record spectra and derive vertical column amounts followed the format of previous instrument intercomparisons organised by the Network for Detection of Stratospheric Change (NDSC), but the level of agreement achieved was significantly better than for previous intercomparisons. For most gases the differences were typically 1% or less, with at least one of the five datasets showing no statistically significant difference between the results from different instruments. Principal exceptions were HNO(3) and CO(2) when measured on the Mercury Cadmium Telluride (MCT) detectors. For these gases differences of between 2% and 3% were more typical. We present evidence that these larger differences are due to the effects of detector non-linearity and show that by applying an established non-linearity correction method the typical level of agreement can be improved to better than 1% for these gases. We suggest that the improved level of agreement achieved during this intercomparison is indicative of the current state of the art within the NDSC infra-red working group and is a result of improved understanding of the importance of critical alignment parameters and newly developed techniques to characterise the spectrometers' performance. (c) 2005 Elsevier Ltd. All rights reserved.},
  author       = {Meier, Arndt and Paton-Walsh, C and Bell, W and Blumenstock, T and Hase, F and Goldman, A and Steen, A and Kift, R and Woods, P and Kondo, Y},
  issn         = {0022-4073},
  keyword      = {FTIR,intercomparison,atmospheric spectroscopy,trace gases,remote,sensing},
  language     = {eng},
  number       = {1},
  pages        = {75--84},
  publisher    = {Elsevier},
  series       = {Journal of Quantitative Spectroscopy & Radiative Transfer},
  title        = {Evidence of reduced measurement uncertainties from an FTIR instrument intercomparison at Kiruna, Sweden},
  url          = {http://dx.doi.org/10.1016/j.jqsrt.2005.02.001},
  volume       = {96},
  year         = {2005},
}