AbstractHalocarbons, such as CFC-11, CFC-12 and HCFC-22, are important trace gases in the atmosphere through their role as greenhouse gases and their influence on stratospheric ozone chemistry. This paper focuses on an initial study using integration of spectral radiance measurements from a spaceborne limb sounding Fourier Transform Spectrometer (FTS) to retrieve these compounds in the upper troposphere and lower stratosphere (UTLS). The instrument employed in this study is the Michelson Interferometer for Passive Atmospheric Sounding onboard ENVISAT (MIPAS-E) which obtains spectral data in the altitude range of 6–68km at an unapodized spectral resolution of 0.025cm−1. We have used optimal estimation techniques to retrieve vertical information for these compounds using a radiometric approach.It is shown that significant retrieval information is obtained at up to five measured levels in the UTLS for CFC-11, up to six for CFC-12 and up to two levels for HCFC-22. An initial error analysis indicates significant sensitivity of our retrievals to variability in operationally retrieved pressure and temperature data. For each halocarbon, gain, offset and spectroscopic uncertainties generally each contribute less than 10% to the total error. Finally, tracer correlations are used to compare the datasets to equivalent relationships derived here from version 2 ATMOS data with very good agreements for CFC-12 but with more variability in the CFC-11 comparisons.
The potential for radiometric retrievals of halocarbon concentrations from the MIPAS-E instrument
Advances in Space Research ; 37 , 12 ; 2238-2246
2005-06-15
9 pages
Article (Journal)
Electronic Resource
English
The potential for radiometric retrievals of halocarbon concentrations from the MIPAS-E instrument
Online Contents | 2006
|The potential for radiometric retrievals of halocarbon concentrations from the MIPAS-E instrument
British Library Conference Proceedings | 2006
|Mesospheric Retrievals from MIPAS
British Library Conference Proceedings | 2007
|Radiometric Accuracy of MIPAS Calibrated Spectra
British Library Conference Proceedings | 2007
|MIPAS AS A MESOSPHERIC INSTRUMENT
British Library Conference Proceedings | 2007
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