<?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>S0016-71692018000100067</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Impact of powerful volcanic eruptions and solar activity on the climate above the Arctic Circle]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kasatkina]]></surname>
<given-names><![CDATA[Elena A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Shumilov]]></surname>
<given-names><![CDATA[Oleg I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Timonen]]></surname>
<given-names><![CDATA[Mauri]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kanatjev]]></surname>
<given-names><![CDATA[Alexander G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Polar Geophysical Institute  ]]></institution>
<addr-line><![CDATA[Apatity ]]></addr-line>
<country>Russia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Natural resources Institute Finland (LUKE)  ]]></institution>
<addr-line><![CDATA[Rovaniemi ]]></addr-line>
<country>Finland</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<volume>57</volume>
<numero>1</numero>
<fpage>67</fpage>
<lpage>77</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692018000100067&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692018000100067&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692018000100067&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  The tree growth response in polar region (Kola Peninsula and Finnish Lapland) to the most powerful (VEI&gt;4) volcanic eruptions is assessed over a period of 1445-2005. The analysis was based on the Loparskaya (1445-2005) and Finnish supra-long (~ 7500 years) tree-ring chronologies. These chronologies were developed from Pinus sylvestris L. samples collected near the northern tree line at Loparskaya station (68.63º N, 33.25º E) and Finnish Lapland (68-70º N; 20-30º E), respectively. A superposed epoch analysis indicated a significant decrease in polar tree-ring growth over 7 years after the eruptions with subsequent recovery to its normal level. The level of tree growth in polar region is affected by most powerful low-latitude volcanic eruptions. By contrast, high-latitude Icelandic volcanoes have no significant impact on the climate of Kola Peninsula and Finnish Lapland. The application of wavelet analysis for the Loparskaya tree ring chronology allowed to identify the existence of the main cycles of solar activity (11, 20-25, and ~ 100 years). Moreover, the wavelet analysis revealed a strong coherence in the 8-13 and 20-30 year bands, indicating a possible link between solar activity and climate change on a regional scale.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En este trabajo, se evalúa la respuesta del crecimiento de los árboles en la región polar (Península de Kola y la Laponia de Finlandia) a las erupciones volcánicas más potentes (VEI &gt; 4) durante un periodo de 1445-2005. El análisis se basó en dos cronologías de anillos de árboles de elevada resolución: Loparskaya (1445-2005) y Finnish (~ 7500 años). Estas cronologías se desarrollaron a partir de muestras de Pinus sylvestris L. recogidas cerca de la línea de árboles del norte en la estación de Loparskaya (68.63º N, 33.25º E) y la Laponia finlandesa (68-70º N; 20-30º E), respectivamente. El análisis de sobreposición de época indicó una disminución significativa en el crecimiento de los anillos de los árboles polares durante 7 años después de las erupciones. Asimismo, el estudio de los anillos muestra que el nivel de crecimiento de los árboles en la región polar se ve afectado por las más poderosas erupciones volcánicas producidas en latitudes bajas. En cambio, los volcanes islandeses no tienen un impacto significativo en el clima de la Península de Kola y la Laponia finlandesa. La aplicación del análisis wavelet para la cronología del anillo de árboles de Loparskaya permitió identificar la existencia de los ciclos principales de actividad solar (11, 20-25 y ~ 100 años). Además el análisis wavelet reveló una fuerte coherencia en las bandas 8-13 y 20-30 años indicando un posible vínculo entre la actividad solar y el cambio climático a escala regional.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[volcanic eruptions]]></kwd>
<kwd lng="en"><![CDATA[tree-ring data]]></kwd>
<kwd lng="en"><![CDATA[climate change]]></kwd>
<kwd lng="en"><![CDATA[solar activity]]></kwd>
<kwd lng="es"><![CDATA[erupciones volcánicas]]></kwd>
<kwd lng="es"><![CDATA[datos de los anillos de los árboles]]></kwd>
<kwd lng="es"><![CDATA[cambio climático]]></kwd>
<kwd lng="es"><![CDATA[actividad solar]]></kwd>
</kwd-group>
</article-meta>
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