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<article language="en">
	<journal>
		<journal_title>Atmospheric Measurement Techniques Discussions</journal_title>
		<journal_url>www.atmos-meas-tech-discuss.net</journal_url>
		<eissn>1867-8610</eissn>
		<volume_number>2</volume_number>
		<issue_number>1</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/amtd-2-439-2009</doi>
	<article_url>http://www.atmos-meas-tech-discuss.net/2/439/2009/</article_url>
	<abstract_html>http://www.atmos-meas-tech-discuss.net/2/439/2009/amtd-2-439-2009.html</abstract_html>
	<fulltext_pdf>http://www.atmos-meas-tech-discuss.net/2/439/2009/amtd-2-439-2009.pdf</fulltext_pdf>
	<start_page>439</start_page>
	<end_page>487</end_page>
	<publication_date>2009-02-25</publication_date>
	<article_title content_type="html">MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O&lt;sub&gt;3&lt;/sub&gt;, HNO&lt;sub&gt;3&lt;/sub&gt;, N&lt;sub&gt;2&lt;/sub&gt;O, H&lt;sub&gt;2&lt;/sub&gt;O and relative humidity over ice: retrievals and comparison to MLS</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>S. Chauhan</name>
			<email>swarup.chauhan@imk.fzk.de</email>
		</author>
		<author numeration="2" affiliations="1">
			<name>M. Höpfner</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>G. P. Stiller</name>
		</author>
		<author numeration="4" affiliations="1">
			<name>T. von Clarmann</name>
		</author>
		<author numeration="5" affiliations="2">
			<name>B. Funke</name>
		</author>
		<author numeration="6" affiliations="1">
			<name>N. Glatthor</name>
		</author>
		<author numeration="7" affiliations="1">
			<name>U. Grabowski</name>
		</author>
		<author numeration="8" affiliations="1">
			<name>A. Linden</name>
		</author>
		<author numeration="9" affiliations="1">
			<name>S. Kellmann</name>
		</author>
		<author numeration="10" affiliations="1,4">
			<name>M. Milz</name>
		</author>
		<author numeration="11" affiliations="1,5">
			<name>T. Steck</name>
		</author>
		<author numeration="12" affiliations="1">
			<name>H. Fischer</name>
		</author>
		<author numeration="13" affiliations="3">
			<name>L. Froidevaux</name>
		</author>
		<author numeration="14" affiliations="3">
			<name>A. Lambert</name>
		</author>
		<author numeration="15" affiliations="3">
			<name>M. L. Santee</name>
		</author>
		<author numeration="16" affiliations="3">
			<name>M. Schwartz</name>
		</author>
		<author numeration="17" affiliations="3">
			<name>W. G. Read</name>
		</author>
		<author numeration="18" affiliations="3">
			<name>N. J. Livesey</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Institut für Meteorologie und Klimaforschung, Forschungszentrum Karlsruhe, Germany</affiliation>
		<affiliation numeration="2" content_type="html">Instituto de Astrof{í}sica de Andaluc{í}a CSIC, Granada, Spain</affiliation>
		<affiliation numeration="3" content_type="html">Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA</affiliation>
		<affiliation numeration="4" content_type="html">now at: Luleå Tekniska Universitet Institutionen för Rymdvetenskap, Kiruna, Sweden</affiliation>
		<affiliation numeration="5" content_type="html">now at: Gymnasium, Neckartenzlingen, Germany</affiliation>
	</affiliations>
	<abstract content_type="html">During several periods since 2005 the Michelson Interferometer for Passive
Atmospheric Sounding (MIPAS) on Envisat has performed observations dedicated
to the region of the upper troposphere/lower stratosphere (UTLS). For the
duration of November/December 2005 global distributions of temperature and
several trace gases from MIPAS UTLS-1 mode measurements have been retrieved
using the IMK/IAA (Institut für Meteorologie und Klimaforschung/Instituto
de Astrofísica de Andalucía) scientific processor. In the UTLS
region a vertical resolution of 2.5 to 3 km has been achieved. The retrieved
temperature, H&lt;sub&gt;2&lt;/sub&gt;O, O&lt;sub&gt;3&lt;/sub&gt;, HNO&lt;sub&gt;3&lt;/sub&gt;, N&lt;sub&gt;2&lt;/sub&gt;O, and relative
humidity over ice are intercompared with the Microwave Limb Sounder
(MLS/Aura) v2.2 data. In general, MIPAS and MLS temperatures agree within
&amp;plusmn;4 K over the whole pressure range of 316–0.68 hPa. Systematic,
latitude-independent differences of &amp;minus;2 to &amp;minus;4 K (MIPAS-MLS) at 121 hPa
are explained by previously observed biases in the MLS v2.2 temperature
retrievals. Temperature differences of &amp;minus;4 K up to 12 K above 10.0 hPa
are present similarly in MIPAS and MLS with respect to ECMWF (European Centre
for Medium-Range Weather Forecasts) and are likely due to deficiencies of the
ECMWF analysis data. MIPAS and MLS stratospheric volume mixing ratios (vmr)
of H&lt;sub&gt;2&lt;/sub&gt;O agree within &amp;plusmn;1 ppmv, with indication of oscillations between
146 and 26 hPa in the MLS dataset. Tropical upper tropospheric values of
relative humidity over ice measured by the two instruments differ by
&amp;plusmn;20% in the pressure range ~146 to 68 hPa. These differences are
mainly caused by the MLS temperature biases. Ozone mixing ratios agree within
0.5 ppmv (10 to 20%) between 68 and 14 hPa. At pressures smaller than
10 hPa, MIPAS O&lt;sub&gt;3&lt;/sub&gt; vmr are higher than MLS by an average of 0.5 ppmv
(10%). General agreement between MIPAS and MLS HNO&lt;sub&gt;3&lt;/sub&gt; is within the range
of &amp;minus;1.0 (&amp;minus;10%) to 1.0 ppbv (20%). MIPAS HNO&lt;sub&gt;3&lt;/sub&gt; is 1.0 ppbv (10%)
higher compared to MLS in the height range of 46 to 10 hPa over the Northern Hemisphere. Over the tropics at 31.6 hPa MLS shows a low bias of more than
1 ppbv (&amp;gt;50%). In general, MIPAS and MLS N&lt;sub&gt;2&lt;/sub&gt;O vmr agree within 20 to
40 ppbv (20 to 40%). Differences in the height range between 100 to 21 hPa
are attributed to a known 20% positive bias in MIPAS N&lt;sub&gt;2&lt;/sub&gt;O data.</abstract>
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</article>

