<?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>S0187-62362020000400301</article-id>
<article-id pub-id-type="doi">10.20937/atm.52768</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Climatic variation in the high mountains of central Mexico: Temperature and precipitation indices at Nevado de Toluca volcano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto]]></surname>
<given-names><![CDATA[Victor H.]]></given-names>
</name>
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</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yoshikawa]]></surname>
<given-names><![CDATA[Kenji]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schörghofer]]></surname>
<given-names><![CDATA[Norbert]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Veracruzana Facultad de Ciencias Biológicas y Agropecuarias ]]></institution>
<addr-line><![CDATA[Tuxpan Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Alaska Water and Environmental Research Center ]]></institution>
<addr-line><![CDATA[Fairbanks Alaska]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Planetary Science Institute  ]]></institution>
<addr-line><![CDATA[Honolulu Hawaii]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>33</volume>
<numero>4</numero>
<fpage>301</fpage>
<lpage>318</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362020000400301&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362020000400301&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362020000400301&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Nevado de Toluca weather station (4283 masl, 19 ºN) has recorded meteorological data for over half a century, and this combination of elevation and duration provides a rare opportunity to study climate trends in a tropical high-mountain environment. The climatic variability during the period 1965-2015 at the Nevado de Toluca volcano was analyzed. Nine standard climate indices for temperature and seven for precipitation were calculated from daily data from its weather station. The results, with a high level of statistical significance, show an increase in the number of days with night frost and cold periods; likewise, results indicate an increase in the diurnal thermal oscillation. Total accumulated precipitation shows an increasing tendency over time, although the periods with precipitation are increasingly isolated. This suggests that seasonal snow on the summit of the volcano will be increasingly isolated but, at the same time, the snowpack will persist longer. This work is expected to serve as a reference for other high-mountain tropical environmental studies, where air temperature and precipitation are crucial issues.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La estación meteorológica del Nevado de Toluca (4283 masl, 19 ºN) ha registrado datos climáticos por más de medio siglo, y su combinación de altura y extenso periodo de registro proporciona una excelente oportunidad para estudiar tendencias climáticas en un ambiente tropical de alta montaña. Se analizó la variabilidad climática en el volcán Nevado de Toluca durante el periodo 1965-2015. Se calcularon nueve índices climáticos estándar para temperatura y siete para precipitación a partir de datos diarios de la estación. Los resultados, que poseen un alto nivel de significancia estadística, muestran un incremento en el número de días con heladas nocturnas y periodos fríos; de manera similar, muestran un incremento en la variación térmica diurna. La precipitación total acumulada exhibe una tendencia ascendente a lo largo del tiempo, aunque los periodos con precipitación son cada vez más aislados. Esto sugiere también que se incrementará el aislamiento de la nieve estacional en la cima del volcán, pero la capa de nieve durará más tiempo. El objetivo de este trabajo es servir como referencia para otros estudios ambientales de alta montaña en los que la temperatura del aire y la precipitación son aspectos cruciales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[climate variability]]></kwd>
<kwd lng="en"><![CDATA[Nevado de Toluca volcano]]></kwd>
<kwd lng="en"><![CDATA[temperature]]></kwd>
<kwd lng="en"><![CDATA[precipitation]]></kwd>
<kwd lng="en"><![CDATA[climate trend]]></kwd>
</kwd-group>
</article-meta>
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