<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-6236</journal-id>
<journal-title><![CDATA[Atmósfera]]></journal-title>
<abbrev-journal-title><![CDATA[Atmósfera]]></abbrev-journal-title>
<issn>0187-6236</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-62362018000400331</article-id>
<article-id pub-id-type="doi">10.20937/atm.2018.31.04.02</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Content and composition of dissolved organic carbon in precipitation at the southern part of Mexico City]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montero-Martínez]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Arellano]]></surname>
<given-names><![CDATA[Joel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roy]]></surname>
<given-names><![CDATA[Priyadarsi D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosado-Abón]]></surname>
<given-names><![CDATA[Anielka]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Nagay]]></surname>
<given-names><![CDATA[Déborah Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Trejo]]></surname>
<given-names><![CDATA[Angélica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Andraca-Ayala]]></surname>
<given-names><![CDATA[Gema Luz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Ciencias de la Atmósfera ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Química ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>31</volume>
<numero>4</numero>
<fpage>331</fpage>
<lpage>346</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362018000400331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362018000400331&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362018000400331&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We present concentrations of dissolved total carbon (TC) and organic carbon (OC) in rainwater samples collected in 2016 in the southern part of Mexico City in a preliminary study. TC ranged from 10 to 25 mgC L-1 and OC - reported as non-purgable organic carbon (NPOC) - varied between 2.5 and 20 mgC L-1. NPOC concentrations were higher in samples collected between May and July and a change in the ratio of NPOC/TC was detected for the second part of the campaign (i.e., August-October). 1H NMR analysis indicated presence of aldehydes, carboxylic and other oxygenated hydrocarbons in the precipitation. An evaluation of air mass back-trajectories suggested no relationship between the organic contents and wind directions. Carbon contents were originated from sources within the basin of Mexico and higher pH of rainwater during the passage of air masses indicates that the sources causing rain neutralization are located in northern parts of the city.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se presentan las concentraciones de carbono total disuelto (TC) y carbono orgánico (OC) en muestras de agua de lluvia recolectadas durante 2016 en el sur de la Ciudad de México. El TC varió de 10 a 25 mgC L-1 y el OC, reportado como carbón orgánico no purgable (NPOC, por sus siglas en inglés), tuvo un rango de 2.5 a 20 mgC L-1. Los valores más altos de NPOC se midieron en las muestras recolectadas entre mayo y julio, y se detectó un cambio en la razón de NPOC/TC para la segunda parte de la campaña (es decir, agosto-octubre). El análisis por 1H RMN sugiere que aldehídos, ácidos carboxílicos y otros hidrocarburos oxigenados constituyen la fracción orgánica disuelta en las muestras de precipitación. La evaluación de las trayectorias de las masas de aire no encontró ninguna relación entre los contenidos de compuestos orgánicos y las direcciones del viento dominante para la formación de las tormentas, lo que sugiere que los compuestos orgánicos disueltos en el agua de lluvia tienen su origen en fuentes dentro de la cuenca de México. Además, los valores de pH más altos en las muestras estudiadas indican que la neutralización de la lluvia ocurre cuando las tormentas provienen del norte de la ciudad, donde se encuentran las fuentes de los agentes que producen este efecto.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Water-soluble organic compounds]]></kwd>
<kwd lng="en"><![CDATA[rainwater characterization]]></kwd>
<kwd lng="en"><![CDATA[rain neutralization]]></kwd>
<kwd lng="en"><![CDATA[urban pollution]]></kwd>
<kwd lng="en"><![CDATA[Mexico City]]></kwd>
</kwd-group>
</article-meta>
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