Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue
The GOMOS ozone profiles have been analysed to evaluate the GOMOS ability to capture the long-term ozone evolution at mid-latitudes during the expected recovery phase of the ozone layer. Version 5 of the operational GOMOS ozone data has been compared with data from two of the longest ground-based in...
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doaj-1be0347dfbd148749bc2aa54c8a598792020-11-24T21:57:23ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242010-12-011023118391184910.5194/acp-10-11839-2010Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issueP. Keckhut0A. Hauchecorne1L. Blanot2K. Hocke3S. Godin-Beekmann4J.-L. Bertaux5G. Barrot6E. Kyrölä7J. A. E. van Gijsel8A. Pazmino9LATMOS-IPSL, CNRS/INSU, UMR 8190, UVSQ, UPMC, Guyancourt, FranceLATMOS-IPSL, CNRS/INSU, UMR 8190, UVSQ, UPMC, Guyancourt, FranceACRI-ST, Sophia Antipolis, Sophia Antipolis, FranceInstitute of Applied Physics, University of Bern, Bern, SwitzerlandLATMOS-IPSL, CNRS/INSU, UMR 8190, UVSQ, UPMC, Guyancourt, FranceLATMOS-IPSL, CNRS/INSU, UMR 8190, UVSQ, UPMC, Guyancourt, FranceACRI-ST, Sophia Antipolis, Sophia Antipolis, FranceFMI, Helsinki, FinlandRIVM, Bilthoven, The NetherlandsLATMOS-IPSL, CNRS/INSU, UMR 8190, UVSQ, UPMC, Guyancourt, FranceThe GOMOS ozone profiles have been analysed to evaluate the GOMOS ability to capture the long-term ozone evolution at mid-latitudes during the expected recovery phase of the ozone layer. Version 5 of the operational GOMOS ozone data has been compared with data from two of the longest ground-based instruments based on different techniques and already involved with many other previous space instrument validations. Comparisons between ground-based and GOMOS data confirm the occurrence of spurious retrievals mainly occurring since 2006. Using a selected set of data it is shown that some bad retrievals are induced by the increasing dark charge of the detectors combined with an inadequate method for its correction. This effect does not only induce a continuous bias, but is rather exhibiting a bimodal distribution including the correct profiles and the bad retrievals. For long-term analyses it is recommended filtering the data according to background light conditions and star temperature (spectrum shape). The new method of the dark charge estimate proposed to be implemented in the version 6 of the ESA algorithm seems to significantly reduce the occurrence of such effects and should allow to monitor stratospheric ozone using GOMOS data with greater confidence.http://www.atmos-chem-phys.net/10/11839/2010/acp-10-11839-2010.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
P. Keckhut A. Hauchecorne L. Blanot K. Hocke S. Godin-Beekmann J.-L. Bertaux G. Barrot E. Kyrölä J. A. E. van Gijsel A. Pazmino |
spellingShingle |
P. Keckhut A. Hauchecorne L. Blanot K. Hocke S. Godin-Beekmann J.-L. Bertaux G. Barrot E. Kyrölä J. A. E. van Gijsel A. Pazmino Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue Atmospheric Chemistry and Physics |
author_facet |
P. Keckhut A. Hauchecorne L. Blanot K. Hocke S. Godin-Beekmann J.-L. Bertaux G. Barrot E. Kyrölä J. A. E. van Gijsel A. Pazmino |
author_sort |
P. Keckhut |
title |
Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue |
title_short |
Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue |
title_full |
Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue |
title_fullStr |
Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue |
title_full_unstemmed |
Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue |
title_sort |
mid-latitude ozone monitoring with the gomos-envisat experiment version 5: the noise issue |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2010-12-01 |
description |
The GOMOS ozone profiles have been analysed to evaluate the GOMOS
ability to capture the long-term ozone evolution at mid-latitudes
during the expected recovery phase of the ozone layer. Version 5 of
the operational GOMOS ozone data has been compared with data from
two of the longest ground-based instruments based on different
techniques and already involved with many other previous space
instrument validations. Comparisons between ground-based and GOMOS
data confirm the occurrence of spurious retrievals mainly occurring
since 2006. Using a selected set of data it is shown that some bad
retrievals are induced by the increasing dark charge of the
detectors combined with an inadequate method for its correction.
This effect does not only induce a continuous bias, but is rather
exhibiting a bimodal distribution including the correct profiles and
the bad retrievals. For long-term analyses it is recommended
filtering the data according to background light conditions and star
temperature (spectrum shape). The new method of the dark charge
estimate proposed to be implemented in the version 6 of the ESA
algorithm seems to significantly reduce the occurrence of such
effects and should allow to monitor stratospheric ozone using GOMOS
data with greater confidence. |
url |
http://www.atmos-chem-phys.net/10/11839/2010/acp-10-11839-2010.pdf |
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