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<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACPD</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics Discussions</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACPD</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7375</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/acpd-4-1665-2004</article-id>
<title-group>
<article-title>Highly resolved global distribution of tropospheric NO&lt;sub&gt;2&lt;/sub&gt; using GOME narrow swath mode data</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Beirle</surname>
<given-names>S.</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>Platt</surname>
<given-names>U.</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>Wenig</surname>
<given-names>M.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Wagner</surname>
<given-names>T.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Institut für Umweltphysik, Universität Heidelberg, Germany</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA</addr-line>
</aff>
<pub-date pub-type="epub">
<day>16</day>
<month>03</month>
<year>2004</year>
</pub-date>
<volume>4</volume>
<issue>2</issue>
<fpage>1665</fpage>
<lpage>1689</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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<self-uri xlink:href="http://www.atmos-chem-phys-discuss.net/4/1665/2004/acpd-4-1665-2004.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/4/1665/2004/acpd-4-1665-2004.pdf</self-uri>
<abstract>
<p>The Global Ozone Monitoring Experiment (GOME, since 1995) allows the retrieval of global total column densities of atmospheric 
trace gases, including NO&lt;sub&gt;2&lt;/sub&gt;. Tropospheric vertical column densities (VCDs) are derived by estimating the stratospheric fraction from measurements over the remote ocean. Mean maps of tropospheric NO&lt;sub&gt;2&lt;/sub&gt; VCDs derived from GOME clearly allow to detect regions with enhanced industrial activity, but the standard spatial resolution of the GOME ground pixels (320&amp;times;40 km&lt;sup&gt;2&lt;/sup&gt;) is insufficient to resolve regional trace gas distributions or individual cities.

&lt;br&gt;&lt;br&gt;
Within the nominal GOME operation, every tenth day measurements in the so called narrow swath mode are executed with 
a much better spatial resolution
(80&amp;times;40 km&lt;sup&gt;2&lt;/sup&gt;). Though the global coverage of these data is &amp;ndash; due to the narrow swath &amp;ndash; rather 
poor, the mean distribution over several years (1997&amp;ndash;2001) allows to construct a much more detailed picture of the global NO&lt;sub&gt;2&lt;/sub&gt; distribution, especially if corrected for seasonal effects. It vividly illustrates the shortcomings of the standard size GOME pixels and reveals an unprecedented wealth of details in the global distribution of tropospheric NO&lt;sub&gt;2&lt;/sub&gt;. Sharply localised spots of enhanced 
NO&lt;sub&gt;2&lt;/sub&gt; VCD can be associated directly to cities, large power plants, and heavy industry centers.

&lt;br&gt;&lt;br&gt;
The long time series of GOME data allows a quantitative comparison of the narrow swath mode data to the nominal resolution that holds general information on the dependency of NO&lt;sub&gt;2&lt;/sub&gt; VCDs on pixel size. This is important for new instruments like 
SCIAMACHY (launched March 2002 on ENVISAT) or OMI and GOME II (to be launched 2004 and 2005, respectively) with an 
improved spatial resolution.</p>
</abstract>
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