<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd">
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" article-type="research-article" dtd-version="3.0" xml:lang="en">
<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACP</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACP</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7324</issn>
<publisher><publisher-name>Copernicus GmbH</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-10-11277-2010</article-id>
<title-group>
<article-title>Multi sensor reanalysis of total ozone</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>van der A</surname>
<given-names>R. J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Allaart</surname>
<given-names>M. A. F.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Eskes</surname>
<given-names>H. J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>KNMI, P.O. Box 201, 3730 AE De Bilt, The Netherlands</addr-line>
</aff>
<pub-date pub-type="epub">
<day>30</day>
<month>11</month>
<year>2010</year>
</pub-date>
<volume>10</volume>
<issue>22</issue>
<fpage>11277</fpage>
<lpage>11294</lpage>
<permissions>
<license xlink:type="simple">
<license-p>This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
<self-uri xlink:href="http://www.atmos-chem-phys.net/10/11277/2010/acp-10-11277-2010.html">This article is available from http://www.atmos-chem-phys.net/10/11277/2010/acp-10-11277-2010.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys.net/10/11277/2010/acp-10-11277-2010.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/11277/2010/acp-10-11277-2010.pdf</self-uri>
<abstract>
<p>A single coherent total ozone dataset, called the Multi Sensor Reanalysis
(MSR), has been created from all available ozone column data measured by
polar orbiting satellites in the near-ultraviolet Huggins band in the last
thirty years. Fourteen total ozone satellite retrieval datasets from the
instruments TOMS (on the satellites Nimbus-7 and Earth Probe), SBUV
(Nimbus-7, NOAA-9, NOAA-11 and NOAA-16), GOME (ERS-2), SCIAMACHY (Envisat),
OMI (EOS-Aura), and GOME-2 (Metop-A) have been used in the MSR. As first
step a bias correction scheme is applied to all satellite observations,
based on independent ground-based total ozone data from the World Ozone and
Ultraviolet Data Center. The correction is a function of solar zenith angle,
viewing angle, time (trend), and effective ozone temperature. As second step
data assimilation was applied to create a global dataset of total ozone
analyses. The data assimilation method is a sub-optimal implementation of
the Kalman filter technique, and is based on a chemical transport model
driven by ECMWF meteorological fields. The chemical transport model provides
a detailed description of (stratospheric) transport and uses
parameterisations for gas-phase and ozone hole chemistry. The MSR dataset
results from a 30-year data assimilation run with the 14 corrected satellite
datasets as input, and is available on a grid of
1× 1 1/2° with a sample
frequency of 6 h for the complete time period (1978–2008). The
Observation-minus-Analysis (OmA) statistics show that the bias of the MSR
analyses is less than 1% with an RMS standard deviation of about 2%
as compared to the corrected satellite observations used.</p>
</abstract>
<counts><page-count count="18"/></counts>
</article-meta>
</front>
<body/>
<back>
<ref-list>
<title>References</title>
<ref id="ref1">
<label>1</label><mixed-citation publication-type="other" xlink:type="simple"> % vor jede Referenz Balis, D., Lambert, J.-C., Van Roozendael, M., Spurr, R., Loyola, D., Livschitz, Y., Valks, P., Amiridis, V., Gerard, P., Granville, J., and Zehner, C.: Ten years of GOME/ERS-2 total ozone data – The new GOME data processor (GDP) version 4: 2. Ground-based validation and comparisons with TOMS V7/V8, J. Geophys. Res., 111, D07307, doi:10.1029/2005JD006376, 2007a. </mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple"> Balis, D., Kroon, M., Koukouli, M. E., Brinksma, E. J., Labow, G., Veefkind, J. P., and McPeters, R. D.: Validation of Ozone Monitoring Instrument total ozone column measurements using Brewer and Dobson spectrophotometer ground-based observations, J. Geophys. Res., 112, D24S46, doi:10.1029/2007JD008796, 2007b. </mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple"> Bhartia, P. K. and Wellemeyer, C.: TOMS-V8 total O3 algorithm, in OMI Algorithm Theoretical Basis Document, vol. II, OMI Ozone Products, ATBD-OMI-02, edited by P. K. Bhartia, 15–31, NASA Goddard Space Flight Cent., Greenbelt, Md., http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/atbd/, 2002. </mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple"> Bodeker, G. E., Scott, J. C., Kreher, K., and McKenzie, R. L.: Global ozone trends in potential vorticity coordinates using TOMS and GOME intercompared against the Dobson network: 1978–1998, J. Geophys. Res., 106(D19), 23029–23042, 2001. </mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple"> Bodeker, G. E., Shiona, H., and Eskes, H.: Indicators of Antarctic ozone depletion, Atmos. Chem. Phys., 5, 2603–2615, doi:10.5194/acp-5-2603-2005, 2005. </mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple"> Bovensmann, H., Burrows, J. P., Buchwitz, M., Frerick, J., No\&quot;el, S., Rozanov, V. V., Chance, K. V., and Goede, A. P. H.: SCIAMACHY: Mission Objectives and Measurement Modes, J. Atmos. Sci., 56, 127–150, 1999. </mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple"> Brunner, D., Staehelin, J., Maeder, J. A., Wohltmann, I., and Bodeker, G. E.: Variability and trends in total and vertically resolved stratospheric ozone based on the CATO ozone data set, Atmos. Chem. Phys., 6, 4985–5008, doi:10.5194/acp-6-4985-2006, 2006a. </mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple"> Brunner, D., Staehelin, J., Künsch, H.-R., and Bodeker, G. E.: A Kalman filter reconstruction of the vertical ozone distribution in an equivalent latitude-potential temperature framework from TOMS/GOME/SBUV total ozone observations, J. Geophys. Res., 111, D12308, doi:10.1029/2005JD006279, 2006b. </mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple"> Burrows, J. P., Weber, M., Buchwitz, M., Rozanov, V., Ladstätter-Weißenmayer, A., Richter, A., De Beek, R., Hoogen, R., Bramstedt, K., Eichmann, K. U., Eisinger, M., and Perner, D.: The Global Ozone Monitoring Experiment (GOME): Mission Concept and First Scientific Results, J. Atmos. Sci., 56, 151–175, 1999. </mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple"> Callies, J., Corpaccioli, E., Eisinger, M., Hahne, A., and Lefebvre, A.: GOME-2 – Metop&apos;s Second Generation sensor for Operational Ozone Monitoring, ESA Bulletin, 102, 2000 </mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple"> Cariolle, D. and Teyssèdre, H.: A revised linear ozone photochemistry parameterization for use in transport and general circulation models: multi-annual simulations, Atmos. Chem. Phys., 7, 2183–2196, doi:10.5194/acp-7-2183-2007, 2007. </mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple"> Derber, J. C. and Wu, W.-S.: The Use of TOVS Cloud-Cleared Radiances in the NCEP SSI Analysis System, Mon. Weather Rev., 126, 2287–2299, 1998. </mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple">Dethof, A. and Hólm, E. V.: Ozone assimilation in the ERA-40 reanalysis project, Q. J. Roy. Meteor. Soc., 130, 2851–2872, 2004. </mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple"> Eskes, H. J., van Velthoven, P. F. J., Valks, P. J. M. and Kelder, H. M.: Assimilation of GOME total ozone satellite observations in a three-dimensional tracer transport model, Q. J. Roy. Meteorol. Soc., 129, 1663–1681, 2003. </mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple"> Eskes, H. J., van der A, R. J., Brinksma, E. J., Veefkind, J. P., de Haan, J. F., and Valks, P. J. M.: Retrieval and validation of ozone columns derived from measurements of SCIAMACHY on Envisat, Atmos. Chem. Phys. Discuss., 5, 4429–4475, doi:10.5194/acpd-5-4429-2005, 2005. </mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple"> Fioletov, V. E., Bodeker, G. E., Miller, A. J., McPeters, R. D., and Stolarski, R. S.: Global and zonal total ozone variations estimated from ground-based and satellite measurements: 1964–2000, J. Geophys. Res 107(D22), 4647, doi:10.1029/2001JD001350, 2002. </mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple"> Fioletov, V. E., Labow, G., Evans, R., Hare, E. W., Köhler, U., McElroy, C. T., Miyagawa, K., Redondas, A., Savastiouk, V., Shalamyansky, A. M., Staehelin, J., Vanicek, K., and Weber, M.: Performance of the ground-based total ozone network assessed using satellite data, J. Geophys. Res., 113, D14313, doi:10.1029/2008JD009809, 2008. </mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple"> Fortuin, J. P. F. and Kelder, H.: &quot;An ozone climatology base on ozonesonde and satellite measurements&quot;, J. Geophys. Res., 103, 31709–31734, available at: http://www.temis.nl/data/fortuin.html, 1998. </mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple"> Geer, A. J., Lahoz, W. A., Bekki, S., Bormann, N., Errera, Q., Eskes, H. J., Fonteyn, D., Jackson, D. R., Juckes, M. N., Massart, S., Peuch, V.-H., Rharmili, S., and Segers, A.: The ASSET intercomparison of ozone analyses: method and first results, Atmos. Chem. Phys., 6, 5445–5474, doi:10.5194/acp-6-5445-2006, 2006. </mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple"> Harris, N. R. P., Kyrö, E., Staehelin, J., Brunner, D., Andersen, S.-B., Godin-Beekmann, S., Dhomse, S., Hadjinicolaou, P., Hansen, G., Isaksen, I., Jrrar, A., Karpetchko, A., Kivi, R., Knudsen, B., Krizan, P., Lastovicka, J., Maeder, J., Orsolini, Y., Pyle, J. A., Rex, M., Vanicek, K., Weber, M., Wohltmann, I., Zanis, P., and Zerefos, C.: Ozone trends at northern mid- and high latitudes – a European perspective, Ann. Geophys., 26, 1207–1220, doi:10.5194/angeo-26-1207-2008, 2008. </mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple"> Kerr, J. B.: New methodology for deriving total ozone and other atmospheric variables from Brewer spectrophotometer direct sun spectra, J. Geophys. Res., 107(D23), 4731, doi:10.1029/2001JD001227, 2002. </mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple"> Kiesewetter, G., B.-M. Sinnhuber, M. Vountas, M. Weber, and J. P. Burrows, A long-term stratospheric ozone data set from assimilation of satellite observations: High-latitude ozone anomalies, J. Geophys. Res., 115, D10307, doi:10.1029/2009JD013362, 2010. </mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple"> Krol, M., Houweling, S., Bregman, B., van den Broek, M., Segers, A., van Velthoven, P., Peters, W., Dentener, F., and Bergamaschi, P.: The two-way nested global chemistry-transport zoom model TM5: algorithm and applications, Atmos. Chem. Phys., 5, 417–432, doi:10.5194/acp-5-417-2005, 2005. </mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple"> Krzy\&apos;scin, J. W.: Statistical reconstruction of daily total ozone over Europe 1950 to 2004, J. Geophys. Res., 113, D07112, doi:10.1029/2007JD008881, 2008. </mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple"> Lambert, J.-C., Granville, J., Lerot, C., Gerard, P., Fayt, C., Van Roozendael, M. and the ACVT/GBMCD Ozone Column Team: GDP 4.0 transfer to SGP 3.0 for SCIAMACHY ozone column processing: verification with SDOAS/GDOAS prototype algorithms and delta-validation with NDACC and WOUDC network data, Proceedings of the Third Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-3), 4-7 Dec. 2006, ESA/ESRIN, Frascati, Italy, ESA Publications Division Special Publication SP-642 (CD), 2007. </mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple"> Lerot, C., Van Roozendael, M., van Geffen, J., van Gent, J., Fayt, C., Spurr, R., Lichtenberg, G., and von Bargen, A.: Six years of total ozone column measurements from SCIAMACHY nadir observations, Atmos. Meas. Tech., 2, 87–98, doi:10.5194/amt-2-87-2009, 2009. </mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple"> Levelt, P. F., van den Oord, G. H. J., Dobber, M. R., Mälkki, A., Visser, H., de Vries, J., Stammes, P., Lundell, J., and Saari, H.: The Ozone Monitoring Instrument, IEEE T. Geoscu. Remote, 44(5), 1093–1101, doi:10.1109/TGRS.2006.872333, 2006. </mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple"> Lindfors, A., Tanskanen, A., Arola, A., van der A, R., Bais, A., Feister, U., Janouch, M., Josefsson, W., Koskela, T., Lakkala, K., den Outer, P. N., Smedley, A. R. D., Slaper, H., and Webb, A. R.: The PROMOTE UV Record: Toward a Global Satellite-Based Climatology of Surface Ultraviolet Irradiance, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2(3), 207–212, doi:10.1109/JSTARS.2009.2030876, 2009. </mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple"> Mäder, J. A., Staehelin, J., Brunner, D., Stahel, W. A., Wohltmann, I., and Peter, T.: Statistical modeling of total ozone: Selection of appropriate explanatory variables, J. Geophys. Res., 112, D11108, doi:10.1029/2006JD007694, 2007. </mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple"> McPeters, R. D. and Labow, G. J.: An assessment of the accuracy of 14.5 years of Nimbus 7 TOMS version 7 ozone data by comparison with the Dobson network, Geophys. Res. Lett., 23(25), 3695–3698, 1996. </mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple"> McPeters, R., Kroon, M., Labow, G., Brinksma, E., Balis, D., Petropavlovskikh, I., Veefkind, J. P., Bhartia, P. K., and Levelt, P. F.: Validation of the Aura Ozone Monitoring Instrument total column ozone product, J. Geophys. Res., 113, D15S14, doi:10.1029/2007JD008802, 2008. </mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple"> Miller, A. J., Nagatani, R. M., Flynn, L. E., Kondragunta, S., Beach, E., Stolarski, R., McPeters, R. D., Bhartia, P. K., DeLand, M. T., Jackman, C. H., Wuebbles, D. J., Patten, K. O., and Cebula, R. P.: A cohesive total ozone data set from the SBUV(/2) satellite system, J. Geophys. Res., 107(D23), 4701, doi:10.1029/2001JD000853, 2002. </mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple"> Prather, M. J.: Numerical advection by conservation of ozone data in weather-prediction models, Q. J. Roy. Meteorol. Soc., 122, 1545–1571, 1986. </mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple"> Randel, W. J., Shine, K. P., Austin, J., Barnett, J., Claud, C., Gillett, N. P., Keckhut, P., Langematz, U., Lin, R., Long, C., Mears, C., Miller, A., Nash, J., Seidel, D. J., Thompson, D. W. J., Wu, F., and Yoden, S.: An update of observed stratospheric temperature trends, J. Geophys. Res., 114, D02107, doi:10.1029/2008JD010421, 2009. </mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple"> Redondas, A. and Cede, A.: Brewer algorithm sensitivity analysis, SAUNA workshop, Puerto de la Cruz, Tenerife, November, 2006. </mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple"> Reinsel, C. G., Miller, A. J., Weatherhead, E. C., Flynn, L. E., Nagatani, R. M., Tiao, G. C., and Wuebbles, D. J.: Trend analysis of total ozone data for turn- around and dynamical contributions, J. Geophys. Res., 110, D16306, doi:10.1029/2004JD004662, 2005. </mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple"> Stajner, I., Wargan, K., Pawson, S., Hayashi, H., Chang, L.-P., Hudman, R. C., Froidevaux, L., Livesey, N., Levelt, P. F., Thompson, A. M., Tarasick, D. W., Stübi, R., Andersen, S. B., Yela, M., König-Langlo, G., Schmidlin, F. J., and Witte, J. C.: Assimilated ozone from EOS-Aura: Evaluation of the tropopause region and tropospheric columns, J. Geophys. Res., 113, D16S32, doi:10.1029/2007JD008863, 2008. </mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple"> Staehelin, J., Harris N. R. P., Appenzeller, C., and Eberhard, J.: Ozone Trends: A Review, Rev. Geophys., 39(2), 231–290, 2001. </mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple"> Staehelin, J., Kerr, J., Evans, R., and Vanicek, K.: Comparison of total ozone measurements of Dobson and Brewer spectrophotometers and recommended transfer functions, Tech. Rep., WMO, World Meteorological Organization Global Atmosphere Watch (WMO-GAW) Report 149, 2003. </mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple"> Stolarski, R. S., Bloomfield, P., McPeters, R. D., and Herman, J. R.: Total Ozone trends deduced from Nimbus 7 Toms data, Geophys. Res. Lett., 18(6), 1015–1018, 1991. </mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple"> Stolarski, R. S., Labow, G. J., and McPeters, R. D.: Springtime Antarctic total ozone measurements in the early 1970s from the BUV instrument on Nimbus 4, Geophys. Res. Lett., 24(5), 591–594, 1997. </mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple"> Stolarski, R. S. and Frith, S. M.: Search for evidence of trend slow-down in the long-term TOMS/SBUV total ozone data record: the importance of instrument drift uncertainty, Atmos. Chem. Phys., 6, 4057–4065, doi:10.5194/acp-6-4057-2006, 2006a. </mixed-citation>
</ref>
<ref id="ref43">
<label>43</label><mixed-citation publication-type="other" xlink:type="simple"> Stolarski, R. S., Douglass, A. R., Steenrod, S., and Pawson, S.: Trends in stratospheric ozone: Lessons learned from a 3-D chemical transport model, J. Atmos. Sci., 63, 1028–1041, 2006b. </mixed-citation>
</ref>
<ref id="ref44">
<label>44</label><mixed-citation publication-type="other" xlink:type="simple"> Taylor, S. L., Cebula, R. P., Deland, M. T., Huang, L.-K., Stolarski, R. S., and McPeters, R. D.: Improved calibration of NOAA-9 and NOAA-11 SBUV/2 total ozone data using in-flight validation methods, Int. J. Remote Sens., 24.2, 315–328, doi:10.1080/01431160304977, 2003. </mixed-citation>
</ref>
<ref id="ref45">
<label>45</label><mixed-citation publication-type="other" xlink:type="simple"> Valks, P. J. M., De Haan, J. F., Veefkind, J. P., Van Oss, R. F., and Balis, D. S.: TOGOMI: An improved total ozone retrieval algorithm for GOME, XX Quadrennial Ozone Symposium, 1/6/2004-8/6/2004, edited by: Zerefos, C. S., Athens, University of Athens, 129–130, 2004. </mixed-citation>
</ref>
<ref id="ref46">
<label>46</label><mixed-citation publication-type="other" xlink:type="simple"> Valks, P. J. M., Loyola, D., Hao, N., and Rix, M.: Algorithm Theoretical Baseline Document for GOME-2 total column products of ozone, minor trace gases, and cloud properties, DLR/GOME-2/ATBD/01, 2008. </mixed-citation>
</ref>
<ref id="ref47">
<label>47</label><mixed-citation publication-type="other" xlink:type="simple"> Van Roozendael, M., Loyola, D., Spurr, R., Balis, D., Lambert, J.-C., Livschitz, Y., Valks, P., Ruppert, T., Kenter, P., Fayt, C., and Zehner, C.: Ten years of GOME/ERS-2 total ozone data – The new GOME data processor (GDP) version 4: 1. Algorithm description, J. Geophys. Res., 111, D14311, doi:10.1029/2005JD006375, 2006. </mixed-citation>
</ref>
<ref id="ref48">
<label>48</label><mixed-citation publication-type="other" xlink:type="simple"> Veefkind, J. P., de Haan, J. F., Brinksma, E. J., Kroon, M., and Levelt, P. F.: Total Ozone from the Ozone Monitoring Instrument (OMI) Using the DOAS technique, IEEE T. Geosci. Remote, 44(5), 1239–1244, doi:10.1109/TGRS.2006.871204, 2006. </mixed-citation>
</ref>
<ref id="ref49">
<label>49</label><mixed-citation publication-type="other" xlink:type="simple"> WMO (World Meteorological Organisation), Scientific Assessment of Ozone Depletion: 2006, Global Ozone Research and Monitoring Project – Report No. 50, 572~pp., Geneva, Switzerland, 2007. </mixed-citation>
</ref>
<ref id="ref50">
<label>50</label><mixed-citation publication-type="other" xlink:type="simple"> WOUDC: These data were obtained from the World Ozone and Ultraviolet Radiation Data Centre (WOUDC) operated by Environment Canada, Toronto, Ontario, Canada under the auspices of the World Meteorological Organization, available at: http://www.woudc.org/, last access: March 2009. </mixed-citation>
</ref>
</ref-list>
</back>
</article>