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	<journal>
		<journal_title>Atmospheric Chemistry and Physics Discussions</journal_title>
		<journal_url>www.atmos-chem-phys-discuss.net</journal_url>
		<issn>1680-7367</issn>
		<eissn>1680-7375</eissn>
		<volume_number>9</volume_number>
		<issue_number>2</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/acpd-9-10487-2009</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/9/10487/2009/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/9/10487/2009/acpd-9-10487-2009.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/9/10487/2009/acpd-9-10487-2009.pdf</fulltext_pdf>
	<start_page>10487</start_page>
	<end_page>10511</end_page>
	<publication_date>2009-04-30</publication_date>
	<article_title content_type="html">Satellite measurements of formaldehyde from shipping emissions</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>T. Marbach</name>
			<email>marbach@mpch-mainz.mpg.de</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>S. Beirle</name>
		</author>
		<author numeration="3" affiliations="2">
			<name>U. Platt</name>
		</author>
		<author numeration="4" affiliations="1">
			<name>P. Hoor</name>
		</author>
		<author numeration="5" affiliations="3">
			<name>F. Wittrock</name>
		</author>
		<author numeration="6" affiliations="3">
			<name>A. Richter</name>
		</author>
		<author numeration="7" affiliations="3">
			<name>M. Vrekoussis</name>
		</author>
		<author numeration="8" affiliations="1">
			<name>M. Grzegorski</name>
		</author>
		<author numeration="9" affiliations="3,4">
			<name>J. P. Burrows</name>
		</author>
		<author numeration="10" affiliations="1">
			<name>T. Wagner</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Max Planck Institute for Chemistry, Mainz, Germany</affiliation>
		<affiliation numeration="2" content_type="html">Institute of Environmental Physics, Heidelberg, Germany</affiliation>
		<affiliation numeration="3" content_type="html">Institute of Environmental Physics, Bremen, Germany</affiliation>
		<affiliation numeration="4" content_type="html">Center for Ecology and Hydrology, Wallingford, UK</affiliation>
	</affiliations>
	<abstract content_type="html">International shipping is recognized as a pollution source of growing
      importance, in particular in the remote marine boundary
      layer. Nitrogen dioxide originating from ship emissions has previously
      been detected in satellite measurements. This study presents the first
      satellite measurements of formaldehyde (HCHO) linked to shipping
      emissions as derived from observations made by the Global Ozone
      Monitoring Experiment (GOME) instrument.
&lt;br&gt;&lt;br&gt;
      We analyzed enhanced HCHO tropospheric columns from shipping emissions
      over the Indian Ocean between Sri Lanka and Sumatra. This region
      offers good conditions in term of plume detection with the GOME
      instrument as all ship tracks follow a single narrow track in the same
      east-west direction as used for the GOME pixel scanning. The HCHO
      signal alone is weak but could be clearly seen in the high-pass
      filtered data. The line of enhanced HCHO in the Indian Ocean as seen
      in the 7-year composite of cloud free GOME observations clearly
      coincides with the distinct ship track corridor from Sri Lanka to
      Indonesia. The observed mean HCHO column enhancement over this
      shipping route is about 2.0&amp;times;10&lt;sup&gt;15&lt;/sup&gt; molec/cm&lt;sup&gt;2&lt;/sup&gt;.
&lt;br&gt;&lt;br&gt;
      The observed HCHO pattern also agrees qualitatively well with results
      from the coupled earth system model ECHAM5/MESSy applied to
      atmospheric chemistry (EMAC). However, the modelled HCHO values over
      the ship corridor are two times lower than in the GOME high-pass
      filtered data. This might indicate that the used emission inventories
      are too low and/or that the in-plume chemistry taking place in the
      narrow path of the shipping lanes are not well represented at the
      rather coarse model resolution.</abstract>
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