<?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>S0187-62362018000400317</article-id>
<article-id pub-id-type="doi">10.20937/atm.2018.31.04.01</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Acid rain in a Mexican site on the coast of the Gulf of Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sosa-Echeverría]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bravo-Álvarez]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alarcón-Jiménez]]></surname>
<given-names><![CDATA[Ana Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Barrera]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jaimes-Palomera]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Álvarez]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Granados-Hernández]]></surname>
<given-names><![CDATA[Elías]]></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 Sección de Contaminación Ambiental]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Secretaría del Medio Ambiente  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro Tecnológico Aragón Laboratorio de Ingeniería Ambiental]]></institution>
<addr-line><![CDATA[ Estado 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>317</fpage>
<lpage>330</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362018000400317&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362018000400317&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362018000400317&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The activities taking place along the coast of the Gulf of Mexico are of great economic importance; however, these activities are potential sources of acid rain precursors. Potentially sensitive receptors to acid deposition in the coastal region of the Gulf of Mexico are lakes, rivers, forests, soils and monuments of cultural heritage. The aim of this study was to evaluate the chemical composition, enrichment factors and trends of wet atmospheric deposition at La Mancha, Veracruz, from 2003 to 2014. The major ions, pH and conductivity were analyzed daily during rainy and dry seasons. The following value ranges of the annual volume weighted mean (VWM) were: pH: 4.78-5.40; SO4 2-: 16-32 &#956;eq L-1; NO3 -: 4-15 &#956;eq L-1, among others. The principal findings were found: (1) acid rain has been present for more than a decade along the coast of the Gulf of Mexico; (2) the non-marine ions in decreasing order were: NO3 -, NH4 +, Ca+ and SO4 2-; (3) all of the ions were present in major concentrations during the dry season due to minimal precipitation; (4) in several cases, the value of the pH events was low during the rainy season due to the low presence of chemical species that could favor neutralization; (5) the VWM pH in wet deposition was in the range of 4.78 to 5.40 during the study period (2003-2014), and (6) a significant increasing trend for pH was observed during the entire study period, while an increasing trend occurred from 2003 to 2008 for SO4 2-, NO3 -, K+ and Ca2+, which decreased until 2011 and then increased until 2014.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las actividades que tienen lugar a lo largo de la costa del Golfo de México son de gran importancia económica; sin embargo, son una fuente potencial de precursores de lluvia ácida. Los receptores potencialmente sensibles al depósito atmosférico ácido en la región costera del Golfo de México son lagos, ríos, bosques, suelos y monumentos del patrimonio cultural. El objetivo de este estudio fue evaluar la composición química, los factores de enriquecimiento y las tendencias del depósito atmosférico húmedo en La Mancha, Veracruz, de 2003 a 2014. Se analizaron los principales iones, el pH y la conductividad diariamente, tanto en la época de lluvias como de secas. Se obtuvieron los siguientes intervalos de valores anuales para el promedio ponderado por volumen (PPV): pH: 4.78-5.40; SO4 2-: 16-32 &#956;eq L-1; NO3 -: 4-15 &#956;eq L-1, entre otros. Los principales hallazgos fueron: 1) el fenómeno de lluvia ácida ha estado presente durante más de una década a lo largo de la costa del Golfo de México; 2) los iones provenientes de origen no marino en orden decreciente fueron: NO3 -, NH4 +, Ca+ y SO4 2-; 3) todos los iones estuvieron presentes en grandes concentraciones durante la época de secas debido a una menor precipitación; 4) en varios casos, el valor de los eventos de pH fue bajo durante la estación de lluvias debido a la baja presencia de especies químicas que podrían favorecer la neutralización; 5) el intervalo de valores de PPV para el pH fue de 4.78 a 5.40 durante el periodo de estudio (2003-2014), y 6) se observó una tendencia creciente significativa de pH durante todo el periodo de estudio, mientras que entre 2003 y 2008 se produjo una tendencia creciente para SO4 2-, NO3 -, K+ y Ca2+, la cual disminuyó hasta 2011 y luego aumentó hasta 2014.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Gulf of Mexico]]></kwd>
<kwd lng="en"><![CDATA[wet deposition]]></kwd>
<kwd lng="en"><![CDATA[acid rain]]></kwd>
<kwd lng="en"><![CDATA[rain chemical composition]]></kwd>
</kwd-group>
</article-meta>
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