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Volume 11, issue 12
Atmos. Chem. Phys., 11, 5975-5995, 2011
https://doi.org/10.5194/acp-11-5975-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 11, 5975-5995, 2011
https://doi.org/10.5194/acp-11-5975-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 24 Jun 2011

Research article | 24 Jun 2011

NDACC/SAOZ UV-visible total ozone measurements: improved retrieval and comparison with correlative ground-based and satellite observations

F. Hendrick1, J.-P. Pommereau2, F. Goutail2, R. D. Evans3, D. Ionov2,4, A. Pazmino2, E. Kyrö5, G. Held6, P. Eriksen7, V. Dorokhov8, M. Gil9, and M. Van Roozendael1 F. Hendrick et al.
  • 1Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
  • 2LATMOS, CNRS, and University of Versailles Saint Quentin, Guyancourt, France
  • 3Earth System Research Laboratory/Global Monitoring Division, National Oceanic and Atmospheric Administration (NOAA), Boulder, Colorado, USA
  • 4Department of Atmospheric Physics, Research Institute of Physics, St. Petersburg State University, St. Petersburg, Russia
  • 5Arctic Research Center, Finnish Meteorological Institute (FMI), Sodankyla, Finland
  • 6Meteorological Research Institute, Universidade Estadual Paulista, Bauru, S.P., Brazil
  • 7Danish Meteorological Institute, Copenhagen, Denmark
  • 8Central Aerological Observatory, Moscow, Russia
  • 9Instituto de Tecnica Aerospacial (INTA), Torrejón de Ardoz, Spain

Abstract. Accurate long-term monitoring of total ozone is one of the most important requirements for identifying possible natural or anthropogenic changes in the composition of the stratosphere. For this purpose, the NDACC (Network for the Detection of Atmospheric Composition Change) UV-visible Working Group has made recommendations for improving and homogenizing the retrieval of total ozone columns from twilight zenith-sky visible spectrometers. These instruments, deployed all over the world in about 35 stations, allow measuring total ozone twice daily with limited sensitivity to stratospheric temperature and cloud cover. The NDACC recommendations address both the DOAS spectral parameters and the calculation of air mass factors (AMF) needed for the conversion of O3 slant column densities into vertical column amounts. The most important improvement is the use of O3 AMF look-up tables calculated using the TOMS V8 (TV8) O3 profile climatology, that allows accounting for the dependence of the O3 AMF on the seasonal and latitudinal variations of the O3 vertical distribution. To investigate their impact on the retrieved ozone columns, the recommendations have been applied to measurements from the NDACC/SAOZ (Système d'Analyse par Observation Zénithale) network. The revised SAOZ ozone data from eight stations deployed at all latitudes have been compared to TOMS, GOME-GDP4, SCIAMACHY-TOSOMI, SCIAMACHY-OL3, OMI-TOMS, and OMI-DOAS satellite overpass observations, as well as to those of collocated Dobson and Brewer instruments at Observatoire de Haute Provence (44° N, 5.5° E) and Sodankyla (67° N, 27° E), respectively. A significantly better agreement is obtained between SAOZ and correlative reference ground-based measurements after applying the new O3 AMFs. However, systematic seasonal differences between SAOZ and satellite instruments remain. These are shown to mainly originate from (i) a possible problem in the satellite retrieval algorithms in dealing with the temperature dependence of the ozone cross-sections in the UV and the solar zenith angle (SZA) dependence, (ii) zonal modulations and seasonal variations of tropospheric ozone columns not accounted for in the TV8 profile climatology, and (iii) uncertainty on the stratospheric ozone profiles at high latitude in the winter in the TV8 climatology. For those measurements mostly sensitive to stratospheric temperature like TOMS, OMI-TOMS, Dobson and Brewer, or to SZA like SCIAMACHY-TOSOMI, the application of temperature and SZA corrections results in the almost complete removal of the seasonal difference with SAOZ, improving significantly the consistency between all ground-based and satellite total ozone observations.

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