<?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>S0016-71692015000400299</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Surface Energy Balance model for high-altitude glacial system at 19°N on Glaciar Norte, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ontiveros-González]]></surname>
<given-names><![CDATA[Guillermo]]></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 contrib-type="author">
<name>
<surname><![CDATA[Cortés-Ramos]]></surname>
<given-names><![CDATA[Jorge]]></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 Departamento de Vulcanología]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>54</volume>
<numero>4</numero>
<fpage>299</fpage>
<lpage>314</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692015000400299&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692015000400299&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692015000400299&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The glaciers of Mexico are very small ice bodies located on top of the highest mountains of Mexico. They represent a natural gauge for the climatic changes at the 19°N latitude where no other ice bodies are located around the world. Glaciar Norte glacier on Citlaltépetl Volcano, Mexico, has been retreating in a huge scale, just like other glaciers close to the tropics. Following the current trend of the small glaciers around the world, this glacier will probably disappear before mid-century and with its disappearance an important climatic gauge at this latitude will be gone. Therefore, it is important to identify the factors influencing the retreat and eventual demise of the glaciers. This study focuses on the analysis of the energy fluxes of Glaciar Norte's surface on the northern flank of Citlaltépetl Volcano, Mexico. From this, it was calculated the energy balance for a single point on the glacier surface. Here, the glacio-meteorological study is described using data from automatic weather stations installed at &gt;5100 masl with the energy balance model developed from this data. The results suggest that net radiation is the main component responsible for the retreat of Mexican glaciers since this parameter controls the energy balance variability. This situation was compared to the energy balance regime present on other tropical and mid-latitude glaciers and it was possible to establish a first approximation of the energy balance regime on glaciers near 19N latitude based on energy balance variability.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los glaciares de México son pequeños cuerpos de hielo situados en la cima de las montañas más altas de México. Representan un indicador natural para los cambios climáticos en la latitud de 19° norte, donde no hay algún otro cuerpo de hielo en todo el mundo. El Glaciar Norte del Volcán Citlaltépetl, México, ha mostrado un fuerte retroceso igual que otros glaciares cerca de los trópicos. Siguiendo la tendencia actual de los pequeños glaciares de todo el mundo, este glaciar tal vez haya desaparecido antes de mediados de siglo y con esta desaparición se habrá perdido un importante indicador del clima en esta latitud. Por lo tanto, es importante identificar los factores que influyen en el retroceso y eventual desaparición de los glaciares. Este estudio se centra en el análisis de los flujos de energía en la superficie del Glaciar Norte, en el flanco norte del volcán Citlaltépetl, México. A partir de esto, se calcula el balance de energía para un solo punto en la superficie del glaciar. Aquí se describe el estudio glacio-meteorológico realizado a partir de datos de estaciones meteorológicas automáticas instaladas en una elevación &gt;5100 metros y el modelo de balance de energía. Los resultados sugieren que la radiación neta es el principal componente radiativo responsable del retroceso de los glaciares mexicanos ya que este parámetro domina la variabilidad del balance energético. Este comportamiento se comparó con el régimen actual de los glaciares tropicales y de latitudes medias y fue posible establecer una primera aproximación del régimen de este tipo de glaciares basado en la variabilidad del balance energético.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[glaciares mexicanos]]></kwd>
<kwd lng="es"><![CDATA[balance de energía]]></kwd>
<kwd lng="es"><![CDATA[flujo radiativo]]></kwd>
<kwd lng="es"><![CDATA[balance radiativo]]></kwd>
<kwd lng="es"><![CDATA[régimen climatico]]></kwd>
<kwd lng="en"><![CDATA[Mexican glaciers]]></kwd>
<kwd lng="en"><![CDATA[energy balance]]></kwd>
<kwd lng="en"><![CDATA[radiative fluxes]]></kwd>
<kwd lng="en"><![CDATA[radiative balance]]></kwd>
<kwd lng="en"><![CDATA[climate regime]]></kwd>
</kwd-group>
</article-meta>
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