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<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-6-4093-2006</article-id>
<title-group>
<article-title>Long-memory processes in ozone and temperature variations at the  region 60&amp;deg; S&amp;ndash;60&amp;deg; N</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Varotsos</surname>
<given-names>C.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Kirk-Davidoff</surname>
<given-names>D.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Applied Physics, University of Athens, Athens, Greece</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Department of Atmospheric and Oceanic Science, University of Maryland, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>12</day>
<month>09</month>
<year>2006</year>
</pub-date>
<volume>6</volume>
<issue>12</issue>
<fpage>4093</fpage>
<lpage>4100</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>
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<abstract>
<p>Global column ozone and tropospheric temperature observations made by
ground-based (1964&amp;ndash;2004) and satellite-borne (1978&amp;ndash;2004) instrumentation are
analyzed. Ozone and temperature fluctuations in small time-intervals are
found to be positively correlated to those in larger time-intervals in a
power-law fashion. For temperature, the exponent of this dependence is
larger in the mid-latitudes than in the tropics at long time scales, while
for ozone, the exponent is larger in tropics than in the mid-latitudes. In
general, greater persistence could be a result of either stronger positive
feedbacks or larger inertia. Therefore, the increased slope of the power distribution
of  temperature in mid-latitudes at long time scales compared to the slope in the
tropics could be connected to the poleward increase
in climate sensitivity predicted by the global climate models. The detrended
fluctuation analysis of model and observed time series provides a helpful tool
for visualizing errors in the treatment of long-range correlations, whose
correct modeling would greatly enhance confidence in long-term climate and
atmospheric chemistry modeling.</p>
</abstract>
<counts><page-count count="8"/></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"> Audit, B., Bacry, E., Muzy, J. F., and Arneodo, A.: Wavelets based estimators of scaling behavior IEEE, Trans. Information Theory 48, 11, 2938&amp;ndash;2954, 2002. </mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple"> Ausloos, M. and Ivanova, K.: Power-law correlations in the southern-oscillation-index fluctuations characterizing El Nino, Phys. Rev. E, 63, 047201, doi:10.1103/PhysRevE.63047201, 2001. </mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple"> Blender R. and Fraedrich, K.: Long time memory in global warming simulations, Geophys. Res. Lett. 30, 1769, doi:10.1029/2003GL017666, 2003. </mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple"> Brandt, J., Christensen, J., Frohn, L. M., and Berkowicz, R.: Air pollution forecasting from regional to urban street scale - implementation and validation for two cities in Denmark, Phys. Chem. Earth, 28(8), 335&amp;ndash;344, 2003. </mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple"> Camp, C. D., Roulston, M. S., and Yung, Y. L.: Temporal and spatial patterns of the interannual variability of total ozone in the tropics, J. Geophys. Res., 108 (D20): art. No. 4643 Oct 25, 2003. </mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple"> Chandra, S., Varotsos, C., and Flynn, L. E.: The mid-latitude total ozone trends in the northern hemisphere, Geophys. Res. Lett. 23, 555&amp;ndash;558, 1996. </mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple"> Chen, Z., Ivanov, P. C., Hu, K., and Stanley, H. E.: Effect of nonstationarities on detrended fluctuation analysis, Phys. Rev. E, 65, 041107, doi:10.1103/PhysRevE.65.041107, 2002. </mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple"> Chen, Z., Hu, K., Carpena, P., Bernaola-Galvan, P., Stanley, H. E., and Ivanov, P. C.: Effect of nonlinear filters on detrended fluctuation analysis, Phys. Rev. E, 71, 011104, doi:10.1103/PhysRevE.71.011104, 2005. </mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple"> Collette, C. and Ausloos M.: Scaling analysis and evolution equation of the North Atlantic oscillation index fluctuations, ArXiv:nlin.CD/0406068 29, 2004. </mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple"> Crutzen, P. J., Lawrence, M. G., and Pöschl, U.: On the background photochemistry of tropospheric ozone, Tellus A, 51(1), 123&amp;ndash;146, 1999. </mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple"> Dameris, M., Grewe, V., Hein, R., and Schnadt, C.: Assessment of the future development of the ozone layer, Geophys. Res. Lett., 25(19), 3579&amp;ndash;3582, 1998. </mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple"> Dameris, M., Grewe, V., Ponater, M., Deckert, R., Eyring, V., Mager, F., Matthes, S., Schnadt, C., Stenke, A., Steil, B., Bruhl, C., and Giorgetta, M. A.: Long-term changes and variability in a transient simulation with a chemistry-climate model employing realistic forcing, Atmos. Chem. Phys., 5, 2121&amp;ndash;2145, 2005. </mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple"> Dameris, M., Matthes, S., Deckert, R., Grewe, V., and Ponater, M.: Solar cycle effect delays onset of ozone recovery, Geoph. Res. Lett., 33(3), L03806, doi:10.1029/2005GL024741, 2006. </mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple"> Ebel, A.: Evaluation and reliability of meso-scale air pollution simulations, Lect. Notes Comput. Sci., 2179, 255&amp;ndash;263, 2001. </mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple"> Fraedrich, K. and Blender, R.: Scaling of atmosphere and ocean temperature correlations in observations and climate models, Phys. Rev. Lett. 90, 108501, doi:10.1103/PhysRevLett.90.108501, 2003. </mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple"> Galmarini, S., Steyn, D. G., and Ainslie, B.: The scaling law relating world point-precipitation records to duration, Int. J. Climatology, 24(5), 533&amp;ndash;546, 2004. </mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple"> Grytsai, A., Grytsai, Z., Evtushevsky, A., and Milinevsky, G.: Interannual variability of planetary waves in the ozone layer at 65 degrees S, Int. J Remote Sens., 26(16), 3377&amp;ndash;3387, 2005. </mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple"> Hu, K., Ivanov, P. C., Chen, Z., Carpena, P., and Stanley, H. E.: Effect of trends on detrended fluctuation analysis, Phys. Rev. E, 64, 011114, doi:10.1103/PhysRevE.64.011114, 2001. </mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple"> Hudson, R. D., Frolov, A. D., Andrade, M. F., and Follette, M. B.: The total ozone field separated into meteorological regimes. Part I: Defining the regimes, J. Atmos. Science, 60, 1669&amp;ndash;1677, 2003. </mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple"> Hurst, H. E.: Long term storage capacity of reservoirs. Trans. Am. Soc. Civil Eng., 116, 770&amp;ndash;808, 1951. </mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple"> Jacovides, C. P., Varotsos, C., Kaltsounides, N. A., Petrakis, M., and Lalas, D. P.: Atmospheric turbidity parameters in the highly polluted site of Athens basin, Renewable Energy, 4(5), 465&amp;ndash;470, 1994. </mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple"> Kantelhardt, J. W., Zschiegner, S. A., Koscielny-Bunde, E., Havlin, S., Bunde, A., and Stanley, H. E.: Multifractal detrended fluctuation analysis of nonstationary time series, Physica A, 316(1&amp;ndash;4), 87&amp;ndash;114, 2002. </mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple"> Kirk-Davidoff, D. B., Anderson, J. G., Hintsa, E. J., and Keith, D. W.: The effect of climate change on ozone depletion through stratospheric H&lt;sub&gt;2&lt;/sub&gt;O, Nature, 402, 399, 1999. </mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple"> Kondratyev, K. Y. and Varotsos, C.: Atmospheric ozone variability: Implications for climate change, human health and ecosystems, Springer, New York, 2000. </mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple"> Kondratyev, K. Y. and Varotsos, C.: Global tropospheric ozone dynamics &amp;ndash; Part I: Tropospheric ozone precursors - Part II: Numerical modelling of tropospheric ozone variability, Environ. Sci. Pollut. Res., 8(1), 57&amp;ndash;62 2001a. </mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple"> Kondratyev, K. Y. and Varotsos, C.: Global tropospheric ozone dynamics &amp;ndash; Part II: Numerical modelling of tropospheric ozone variability &amp;ndash; Part I: Tropospheric ozone precursors, Environ. Sci. Pollut. Res., 8(2), 113&amp;ndash;119 2001b. </mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple"> Koscielny-Bunde, E. A., Bunde, S. Havlin, H. E. Roman, Y., and Goldreich, Schellnhuber, H. J.: Indication of a universal persistence law governing atmospheric variability. Phys. Rev. Lett., 81(3), 729&amp;ndash;732, 1998. </mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple"> Lawrence, M. G., Crutzen, P. J., Rasch, P. J., Eaton, B. E., and Mahowald, N. M.: A model for studies of tropospheric photochemistry: Description, global distributions, and evaluation, J. Geophys. Res.-Atmos., 104, 26 245&amp;ndash;26 277, 1999. </mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple"> Lovejoy, S.: Area-perimeter relation for rain and cloud areas, Science, 216(4542), 185&amp;ndash;187, 1982. </mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple"> Lovejoy, S. and Schertzer, D.: Direct evidence of multiffractal cascades from planetary scales down to 1 km, Phys. Rev. Lett., 86, 5200, doi:10.1103/PhysRevLett.86.5200, 2001. </mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple"> Maraun, D., Rust, H. W., and Timmer, J.: Tempting long-memory &amp;ndash; on the interpretation of DFA results, Nonlin. Proc. Geoph., 11, 495&amp;ndash;503, 2004. </mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple"> Peng, C. K., Buldyrev, S. V., Havlin, S., Simons, M., Stanley, H. E., and Goldberger, A. L.: Mosaic organization of DNA nucleotides, Phys. Rev. E, 49(2), 1685&amp;ndash;1689, 1994. </mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple"> Richardson, L. F.: Atmospheric diffusion shown on a distance-neighbour graph, Proc. Roy. Soc. A, 110, 709&amp;ndash;737, , 1926. </mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple"> Rust, H.: Interactive comment on &quot;Long-memory processes in global ozone and temperature variations&quot;, edited by: Varotsos, C. and Kirk-Davidoff, D., Atmos. Chem. Phys. Discuss. 6, S1182&amp;ndash;S1185, 2006. </mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple"> Sander, R.: Modeling atmospheric chemistry: Interactions between gas-phase species and liquid cloud/aerosol particles, Surv. Geophys., 20(1), 1&amp;ndash;31, 1999. </mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple"> Schertzer, D. and Lovejoy, S.: The dimension and intermittency of atmospheric dynamics, in Turbulent Shear Flows, Vol. 4, Springer, New York, 7&amp;ndash;33, 1985. </mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple"> Schulz, A., Rex, M., Harris, N. R. P., Braathen, G. O., Reimer, E., Alfier, R., Kilbane-Dawe, I., Eckermann, S., Allaart, M., Alpers, M., Bojkov, B., Cisneros, J., Claude, H., Cuevas, E., Davies, J., De Backer, H., Dier, H., Dorokhov, V., Fast, H., Godin, S., Johnson, B., Kois, B., Kondo, Y., Kosmidis, E., Kyro, E., Litynska, Z., Mikkelsen, I. S., Molyneux, M. J., Murphy, G., Nagai, T., Nakane, H., O&apos;Connor, F., Parrondo, C., Schmidlin, F. J., Skrivankova, P., Varotsos, C., Vialle, C., Viatte, P., Yushkov, V., Zerefos, C., and von der Gathen, P.: Arctic ozone loss in threshold conditions: Match observations in 1997/1998 and 1998/1999, J. Geophys. Res.-Atmos., 106, 7495&amp;ndash;7503, 2001. </mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple"> Stanley, E.: Scaling, universality, and renormalization: Three pillars of modern critical phenomena, Rev. Mod. Phys., 71(2), S358&amp;ndash;S366, 1999. </mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple"> Steinbrecht, W., Hassler, B., Bruhl, C., Dameris, M., Giorgetta, M.A., Grewe, V., Manzini, E., Matthes, S., Schnadt, C., Steil, B., and Winkler, P.: Interannual variation patterns of total ozone and lower stratospheric temperature in observations and model simulations, Atmos. Chem. Phys., 6, 349&amp;ndash;374, 2006. </mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple"> Steinbrecht, W., Hassler, B., Claude, H., Winkler, P., and Stolarski R.S.: Global distribution of total ozone and lower stratospheric temperature variations, Atmos. Chem. Phys., 3, 1421&amp;ndash;1438, 2003. </mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple"> Stohl, A., Cooper, O. R., and James, P.: A cautionary note on the use of meteorological analysis fields for quantifying atmospheric mixing, J. Atmos. Sci., 61(12), 1446&amp;ndash;1453, 2004. </mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple"> Syroka, J. and Toumi, R.: Scaling and persistence in observed and modelled surface Temperature, Geophys. Res. Lett., 28(17), 3255&amp;ndash;3258, 2001. </mixed-citation>
</ref>
<ref id="ref43">
<label>43</label><mixed-citation publication-type="other" xlink:type="simple"> Talkner, P. and Weber, R. O.: Power spectrum and detrended fluctuation analysis: Application to daily temperatures, Phys. Rev. E, 62(1), 150&amp;ndash;160, 2000. </mixed-citation>
</ref>
<ref id="ref44">
<label>44</label><mixed-citation publication-type="other" xlink:type="simple"> Toumi, R., Syroka, J., Barnes, C., and Lewis, P.: Robust non-Gaussian statistics and long-range correlation of total ozone, Atmos. Sci. Lett., 2(1&amp;ndash;4), 94&amp;ndash;103, 2001. </mixed-citation>
</ref>
<ref id="ref45">
<label>45</label><mixed-citation publication-type="other" xlink:type="simple"> Tuck, A. F.: Interactive comment on &quot;Long-memory processes in global ozone and temperature variations&quot;, edited by: Varotsos, C. and Kirk-Davidoff, D., Atmos. Chem. Phys. Discuss., 6, S1053&amp;ndash;S1054, 2006. </mixed-citation>
</ref>
<ref id="ref46">
<label>46</label><mixed-citation publication-type="other" xlink:type="simple"> Tuck, A. F. and Hovde, S. J.: Fractal behavior of ozone, wind and temperature in the lower stratosphere, Geophys. Res. Lett., 26, 1271&amp;ndash;1274, 1999. </mixed-citation>
</ref>
<ref id="ref47">
<label>47</label><mixed-citation publication-type="other" xlink:type="simple"> Tuck, A. F. Hovde, S. J., and Bui, T. P.: Scale invariance in jet streams:ER-2 data around the lower stratospheric polar night vortex, Q. J. R. Meteorol. Soc., 130, 2423&amp;ndash;2444, 2004. </mixed-citation>
</ref>
<ref id="ref48">
<label>48</label><mixed-citation publication-type="other" xlink:type="simple"> Tuck, A. F., Hovde, S. J., Gao, R. S., and Richard, E. C.: Law of mass action in the Arctic lower stratospheric polar vortex January&amp;ndash;March 2000: ClO scaling and the calculation of ozone loss rates in a turbulent fractal medium. J. Geophys. Res.-Atmos., 108(D15), 4451, doi:10.1029/2002JD002832, 2003. </mixed-citation>
</ref>
<ref id="ref49">
<label>49</label><mixed-citation publication-type="other" xlink:type="simple"> Tuck, A. F., Hovde, S. J., Richard, E. C., Fahey, D. W., Gao, R. S., and Bui, T. P.: A scaling analysis of ER-2 data in the inner Arctic vortex during January&amp;ndash;March 2000, J. Geophys. Res.-Atmos., 108(D5), 8306, doi:10.1029/JD000879, 2002. </mixed-citation>
</ref>
<ref id="ref50">
<label>50</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos C.: Modern computational techniques for environmental data: Application to the global ozone layer, Proceedings of the ICCS 2005 in Lect. Notes Comput. Sc., 3516, 504&amp;ndash;510, 2005. </mixed-citation>
</ref>
<ref id="ref51">
<label>51</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, C. and Kirk-Davidoff, D.: Interactive comment on &quot;Long-memory processes in global ozone and temperature variations&quot; edited by: Varotsos, C. and Kirk-Davidoff, D., Reply to the Comment by: Rust, H., Atmos. Chem. Phys. Discuss., 6, S2602&amp;ndash;S2605, 2006a. </mixed-citation>
</ref>
<ref id="ref52">
<label>52</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, C. and Kirk-Davidoff, D.: Interactive comment on &quot;Long-memory processes in global ozone and temperature variations&quot;, edited by: Varotsos, C. and Kirk-Davidoff, D., Reply to Reviewer #2, Atmos. Chem. Phys. Discuss., 6, S2613&amp;ndash;S2616, 2006b. </mixed-citation>
</ref>
<ref id="ref53">
<label>53</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, C., Kondratyev, K. Y., and Efstathiou, M.: On the seasonal variation of the surface ozone in Athens, Greece, Atmos. Environ., 35(2), 315&amp;ndash;320 2001. </mixed-citation>
</ref>
<ref id="ref54">
<label>54</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, P. A., Sarlis, N. V., and Skordas, E. S.: Long-range correlations in the electric signals that precede rupture: Further investigations, Phys. Rev. E, 66, 011902(7), doi:10.1103/PhysRevE.66.011902, 2002. </mixed-citation>
</ref>
<ref id="ref55">
<label>55</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, P. A., Sarlis, N. V., and Skordas, E. S.: Long-range correlations in the electric signals that precede rupture: Further investigations, Phys. Rev. E, 67, 021109, doi:10.1103/PhysRevE.67.021109, 2003a. </mixed-citation>
</ref>
<ref id="ref56">
<label>56</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, P. A., Sarlis, N. V., and Skordas, E. S.: Attempt to distinguish electric signals of a dichotomous nature, Phys. Rev. E, 68, 031106, doi:10.1103/PhysRevE.68.031106, 2003b. </mixed-citation>
</ref>
<ref id="ref57">
<label>57</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, C., Ondov, J., and Efstathiou, M.: Scaling properties of air pollution in Athens, Greece, and Baltimore, Maryland, Atmos. Environ., 39(22) 4041&amp;ndash;4047, 2005. </mixed-citation>
</ref>
<ref id="ref58">
<label>58</label><mixed-citation publication-type="other" xlink:type="simple"> Varotsos, P. A., Sarlis, N. V., Skordas, E. S., Tanaka, H. K., and Lazaridou, M. S.: Entropy of seismic electric signals:Analysis in natural time under time reversal, Phys. Rev. E, 73, 031114, doi:10.1103/PhysRevE.73.031114, 2006. </mixed-citation>
</ref>
<ref id="ref59">
<label>59</label><mixed-citation publication-type="other" xlink:type="simple"> Vinnikov, K. Y. and Grody, N. C.: Global warming trend of mean tropospheric temperature observed by satellites, Science, 302, 269&amp;ndash;272, 2003. </mixed-citation>
</ref>
<ref id="ref60">
<label>60</label><mixed-citation publication-type="other" xlink:type="simple"> Weber, R. O. and Talkner, P.: Spectra and correlations of climate data from days to decades, J. Geophys. Res., 106, 20 131&amp;ndash;20 144, 2001. </mixed-citation>
</ref>
<ref id="ref61">
<label>61</label><mixed-citation publication-type="other" xlink:type="simple"> World Meteorological Organization: Scientific assessment of ozone depletion 2002, Rep. 47, World Meteorol. Organ., Geneva, Switzerland, 2003. </mixed-citation>
</ref>
</ref-list>
</back>
</article>