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Seasonal variation of methane, water vapor, and nitrogen oxides near the tropopause: Satellite observations and model simulations

Identifieur interne : 000019 ( Istex/Corpus ); précédent : 000018; suivant : 000020

Seasonal variation of methane, water vapor, and nitrogen oxides near the tropopause: Satellite observations and model simulations

Auteurs : Mijeong Park ; William J. Randel ; Douglas E. Kinnison ; Rolando R. Garcia ; Wookap Choi

Source :

RBID : ISTEX:1355DC78FE9B21CBB2868CCC1EC46F24AF14CE99

Abstract

Seasonal variations of several trace constituents near the tropopause are analyzed based on satellite measurements, and results are compared to a recent numerical model simulation. We examine methane, water vapor, and nitrogen oxides (NOx) derived from Halogen Occultation Experiment (HALOE) satellite observations; these species have strong gradients near the tropopause, so that their seasonality is indicative of stratosphere‐troposphere exchange (STE) and circulation in the near‐tropopause region. Model results are from the Model for Ozone and Related Chemical Tracers (MOZART) stratosphere‐troposphere chemical transport model (CTM). Results show overall good agreement between observations and model simulations for methane and water vapor, whereas nitrogen oxides near the tropopause are much lower in the model than suggested by HALOE data. The latter difference is probably related to the lightning and convective parameterizations incorporated in MOZART, which produce NOx maxima not near the tropopause, but in the upper troposphere. Constituent seasonal variations highlight the imporatance of the Northern Hemisphere (NH) summer monsoons as regions for transport into the lowermost stratosphere. In MOZART, there is clear evidence that air from the monsoon region is transported into the tropics and entrained into the upward Brewer‐Dobson circulation, bypassing the tropical tropopause.

Url:
DOI: 10.1029/2003JD003706

Links to Exploration step

ISTEX:1355DC78FE9B21CBB2868CCC1EC46F24AF14CE99

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<title type="short">SEASONAL CONSTITUENT VARIABILITY NEAR THE TROPOPAUSE</title>
<title type="shortAuthors">Park
<i>et al</i>
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) derived from Halogen Occultation Experiment (HALOE) satellite observations; these species have strong gradients near the tropopause, so that their seasonality is indicative of stratosphere‐troposphere exchange (STE) and circulation in the near‐tropopause region. Model results are from the Model for Ozone and Related Chemical Tracers (MOZART) stratosphere‐troposphere chemical transport model (CTM). Results show overall good agreement between observations and model simulations for methane and water vapor, whereas nitrogen oxides near the tropopause are much lower in the model than suggested by HALOE data. The latter difference is probably related to the lightning and convective parameterizations incorporated in MOZART, which produce NO
<sub>x</sub>
maxima not near the tropopause, but in the upper troposphere. Constituent seasonal variations highlight the imporatance of the Northern Hemisphere (NH) summer monsoons as regions for transport into the lowermost stratosphere. In MOZART, there is clear evidence that air from the monsoon region is transported into the tropics and entrained into the upward Brewer‐Dobson circulation, bypassing the tropical tropopause.</p>
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<abstract>Seasonal variations of several trace constituents near the tropopause are analyzed based on satellite measurements, and results are compared to a recent numerical model simulation. We examine methane, water vapor, and nitrogen oxides (NOx) derived from Halogen Occultation Experiment (HALOE) satellite observations; these species have strong gradients near the tropopause, so that their seasonality is indicative of stratosphere‐troposphere exchange (STE) and circulation in the near‐tropopause region. Model results are from the Model for Ozone and Related Chemical Tracers (MOZART) stratosphere‐troposphere chemical transport model (CTM). Results show overall good agreement between observations and model simulations for methane and water vapor, whereas nitrogen oxides near the tropopause are much lower in the model than suggested by HALOE data. The latter difference is probably related to the lightning and convective parameterizations incorporated in MOZART, which produce NOx maxima not near the tropopause, but in the upper troposphere. Constituent seasonal variations highlight the imporatance of the Northern Hemisphere (NH) summer monsoons as regions for transport into the lowermost stratosphere. In MOZART, there is clear evidence that air from the monsoon region is transported into the tropics and entrained into the upward Brewer‐Dobson circulation, bypassing the tropical tropopause.</abstract>
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<topic>tropopause</topic>
<topic>methane</topic>
<topic>water</topic>
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<topic authorityURI="http://psi.agu.org/taxonomy5/0300">ATMOSPHERIC COMPOSITION AND STRUCTURE</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0341">Middle atmosphere: constituent transport and chemistry</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0368">Troposphere: constituent transport and chemistry</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0341">Middle atmosphere: constituent transport and chemistry</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0342">Middle atmosphere: energy deposition</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/3300">ATMOSPHERIC PROCESSES</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/3334">Meteorology and Atmospheric Dynamics: Middle atmosphere dynamics</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/3362">Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/3334">Middle atmosphere dynamics</topic>
</subject>
<subject>
<genre>article category</genre>
<topic>Composition and Chemistry</topic>
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<identifier type="ISSN">0148-0227</identifier>
<identifier type="eISSN">2156-2202</identifier>
<identifier type="DOI">10.1002/(ISSN)2156-2202d</identifier>
<identifier type="CODEN">JGREA2</identifier>
<identifier type="PublisherID">JGRD</identifier>
<part>
<date>2004</date>
<detail type="volume">
<caption>vol.</caption>
<number>109</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>D3</number>
</detail>
<extent unit="pages">
<start>n/a</start>
<end>n/a</end>
<total>16</total>
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<identifier type="DOI">10.1029/2003JD003706</identifier>
<identifier type="ArticleID">2003JD003706</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright 2004 by the American Geophysical Union.</accessCondition>
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