<?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>0016-7169</journal-id>
<journal-title><![CDATA[Geofísica internacional]]></journal-title>
<abbrev-journal-title><![CDATA[Geofís. Intl]]></abbrev-journal-title>
<issn>0016-7169</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geofísica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-71692020000100039</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Distribution and current status of permafrost in the highest volcano in North America: Citlaltepetl (Pico de Orizaba), Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto Molina]]></surname>
<given-names><![CDATA[Víctor Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado Granados]]></surname>
<given-names><![CDATA[Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>59</volume>
<numero>1</numero>
<fpage>39</fpage>
<lpage>53</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692020000100039&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692020000100039&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692020000100039&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The occurrence of permafrost in the Citlaltepetl volcano was emphasized and its coverage was updated. Through an empirical and statistical analysis of topo-climatic variables and based on linear regression it was found that the lower limit of continuous permafrost is positioned above 4,880 masl on its northern slope and at 4,963 on the southern slope; on the other hand, discontinuous and isolated patches start at 4,780 and 4,863 meters in the north and south respectively. A high correlation was found between the temperature of the ground profiles and the air temperature at their corresponding altitude. The temperature found in the permafrost classifies it as "warm" permafrost as in most mountains of medium and low latitude and at the same time it is classified as "compromised" and potentially unstable. In spite of the degradation observed from its first estimation during the 1970s, it is estimated that this indicator of climatic change in high mountains will remain at least for a few decades after the Citlaltepetl's glacier has been extinguished.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se enfatiza la presencia de permafrost en el volcán Citlaltépetl y se actualiza su cubertura. Mediante el análisis empírico-estadístico de variables topo-climáticas y con base en el modelo de regresión lineal fue posible determinar que el límite inferior de permafrost continuo se ubica por encima de 4,880 msnm en la ladera norte y por arriba de 4,963 msnm en su ladera sur; por su parte, porciones discontinuas y aisladas inician a partir de 4,780 y 4,863 msnm al norte y sur del cono volcánico respectivamente. Se encontró una alta correlación entre la temperatura de los perfiles del suelo y la del aire en su altitud correspondiente. Las condiciones de temperatura del permafrost permiten considerarlo como "cálido", tal como sucede en montañas de mediana y baja latitud, y al mismo tiempo se puede clasificar como "comprometido" y potencialmente inestable. No obstante la degradación que presenta a partir de su primera estimación en los años 1970, se estima que este indicador de cambio climático de alta montaña permanezca al menos durante algunas décadas una vez que el glaciar del Citlaltépetl se haya extinguido.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Permafrost]]></kwd>
<kwd lng="es"><![CDATA[Citlaltépetl]]></kwd>
<kwd lng="es"><![CDATA[Cambio climático]]></kwd>
<kwd lng="es"><![CDATA[Temperatura del aire]]></kwd>
<kwd lng="es"><![CDATA[Temperatura del suelo]]></kwd>
<kwd lng="es"><![CDATA[Regresión lineal]]></kwd>
<kwd lng="en"><![CDATA[Permafrost]]></kwd>
<kwd lng="en"><![CDATA[Citlaltepetl]]></kwd>
<kwd lng="en"><![CDATA[Climate Change]]></kwd>
<kwd lng="en"><![CDATA[Air temperature]]></kwd>
<kwd lng="en"><![CDATA[Ground temperature]]></kwd>
<kwd lng="en"><![CDATA[Linear regression]]></kwd>
</kwd-group>
</article-meta>
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