<?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>2007-2422</journal-id>
<journal-title><![CDATA[Tecnología y ciencias del agua]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnol. cienc. agua]]></abbrev-journal-title>
<issn>2007-2422</issn>
<publisher>
<publisher-name><![CDATA[Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-24222018000500246</article-id>
<article-id pub-id-type="doi">10.24850/j-tyca-2018-05-10</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Contrastes del Índice de Sequías de Palmer Estandarizado (SPDI) en tres ubicaciones climáticas de San Luis Potosí, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Comparison of the Standardized Palmer Drought Index (SPDI) in three climatic locations in San Luis Potosi, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Aranda]]></surname>
<given-names><![CDATA[Daniel Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí  ]]></institution>
<addr-line><![CDATA[San Luis Potosí San Luis Potosí]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2018</year>
</pub-date>
<volume>9</volume>
<numero>5</numero>
<fpage>246</fpage>
<lpage>279</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222018000500246&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222018000500246&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222018000500246&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las sequías meteorológicas son fenómenos naturales extremos que originan una precipitación menor que la normal, y por ello constituyen una amenaza para los ecosistemas y las sociedades humanas. Para su detección y monitoreo se emplean los índices de sequía, los cuales emplean variables climáticas, a fin de obtener un valor numérico que las caracterice y sea más útil que los datos originales. El SPDI (Standardized Palmer Drought Index) es un índice propuesto recientemente, de tipo multivariado, que utiliza un balance hídrico edafológico, con evapotranspiración potencial estimada, con el método de Thornthwaite y un enfoque probabilístico para procesar las desviaciones de humedad en diferentes duraciones de sequía. El SPDI se aplicó a los datos mensuales de precipitación y temperatura media de tres estaciones climatológicas de amplio registro (&#8805; 50 años) del estado de San Luis Potosí, México, que se ubican en cada una de sus tres áreas geográficas: Altiplano Potosino, Zona Media y Región Huasteca. Tales estaciones son las siguientes: Villa de Arriaga, Río Verde y Xilitla. En cada una de estas estaciones climatológicas se realizó un contraste de resultados del SPDI, contra los que se calculan con los dos índices predecesores el SPI y SPEI. El primero emplea sólo datos de precipitación mensual y el segundo incorpora a la evapotranspiración potencial. El contraste citado se realizó para tres duraciones de sequía de 6, 12 y 24 meses. Los resultados indican que los porcentajes de cada tipo de sequía que establecen los tres índices contrastados son valores similares en orden de magnitud, pero que difieren de manera puntual para cada duración de sequía, primordialmente en relación con las sequías severas y extremas. Por otra parte, las gráficas de evolución del SPDI permiten observar de manera clara los periodos de sequía, definiendo sus fechas de inicio y terminación, así como sus eventos máximos tanto en severidad como en fecha de ocurrencia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Meteorological Droughts are extreme natural phenomena with decreased precipitation, and thus constitute a threat to ecosystems and human societies. Drought Indices are detection and monitoring tools. These indices make use of climatic variables in order to obtain a characteristic numerical value that is more useful than the original raw data. The SPDI (Standardized Palmer Drought Index) is a recently proposed multivariate-type index, which uses a soil water balance with potential evapotranspiration estimated using the Thornthwaite method and a probabilistic approach to process moisture deviations for different durations of drought. The SPDI was applied to monthly precipitation and average temperature data from three climatological stations with large registries (&#8805; 50 years) from the state of San Luis Potosí, Mexico, located in each of its three geographical areas: Altiplano Potosino, Middle Zone and Huasteca Region. These stations are: Villa de Arriaga, Río Verde and Xilitla. A contrast between the SPDI results and those calculated with the two preceding indices (SPI and SPEI) was carried out for each of these climatological stations. The former uses only monthly precipitation data and the latter incorporates potential evapotranspiration. The aforementioned comparison covers drought durations of 6, 12 and 24 months. Results indicate that the percentages of each type of drought indicated by the three indices have similar values in terms of the order of magnitude; however, they differ in a specific way for each drought duration, mainly in relation to severe and extreme droughts. The evolution graphs of the SPDI make it possible to clearly highlight periods of drought, defining their start and end dates as well as maximum events including both severity and the date of occurrence.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[sequías meteorológicas]]></kwd>
<kwd lng="es"><![CDATA[balance hídrico edafológico]]></kwd>
<kwd lng="es"><![CDATA[evapotranspiración potencial]]></kwd>
<kwd lng="es"><![CDATA[pruebas estadísticas]]></kwd>
<kwd lng="es"><![CDATA[sumas móviles]]></kwd>
<kwd lng="es"><![CDATA[distribución Log-Logística]]></kwd>
<kwd lng="es"><![CDATA[índices SPI y SPEI]]></kwd>
<kwd lng="es"><![CDATA[tipos de sequías]]></kwd>
<kwd lng="en"><![CDATA[Meteorological droughts]]></kwd>
<kwd lng="en"><![CDATA[soil water balance]]></kwd>
<kwd lng="en"><![CDATA[potential evapotranspiration]]></kwd>
<kwd lng="en"><![CDATA[statistical tests]]></kwd>
<kwd lng="en"><![CDATA[moving sums]]></kwd>
<kwd lng="en"><![CDATA[Log-Logistic distribution]]></kwd>
<kwd lng="en"><![CDATA[SPI and SPEI indices]]></kwd>
<kwd lng="en"><![CDATA[types of droughts]]></kwd>
</kwd-group>
</article-meta>
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