<?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>S2007-24222018000300213</article-id>
<article-id pub-id-type="doi">10.24850/j-tyca-2018-03-10</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis estadístico de la ocurrencia de sequías meteorológicas anuales según el tipo de clima del estado de San Luis Potosí, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Statistical analysis of the occurrence of annual meteorological droughts according to climate type in the state of 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 ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>9</volume>
<numero>3</numero>
<fpage>213</fpage>
<lpage>231</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222018000300213&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222018000300213&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222018000300213&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las sequías son un fenómeno natural recurrente y regional, gobernado por los parámetros climáticos locales. Siendo la precipitación media anual la magnitud fundamental que define al clima, en este estudio se emplea para su clasificación y para identificar la ocurrencia de las sequías meteorológicas. Se procesaron 32 registros completos de precipitación anual del estado de San Luis Potosí, México, cuyas amplitudes variaron de 45 a 55 años. Tales series anuales definen cuatro climas y en ellas se aplica un modelo extremadamente simple de detección y estimación de la severidad de las sequías. Se obtienen los valores representativos por climas del porcentaje de ocurrencia de sequías (% O) y de su intensidad media (IM). En el clima árido, el % O representativo es de 26.9, con una IM de 0.446. En el clima semiárido, el % O baja a 22.2, con una IM de 0.379; en el clima subhúmedo, ambos indicadores descienden a 18.5 y 0.336. Por último, en el clima húmedo, el % O se reduce hasta 16.4, pero la IM aumenta ligeramente a 0.344. El análisis de las ocurrencias de las sequías en los años analizados permite formular conclusiones sobre su distribución temporal, por años y espacial, dentro del estado de San Luis Potosí, México. Dada la importancia de las estimaciones citadas, para entender el comportamiento de las sequías meteorológicas de una región o estado se recomienda realizar estos análisis en otras regiones del país.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Droughts are a regional and recurrent natural phenomenon, which is governed by local climatic parameters. Since the annual average precipitation is the fundamental quantity defining the climate, in this study it is used for the classification and the identification of the occurrence of meteorological droughts. Thirty-two complete annual rainfall records were processed from the state of San Luis Potosi, Mexico, whose amplitudes ranged from 45 to 55 years. These annual series define four climates, and an extremely simple model to detect and estimate the severity of droughts was applied to them. Two representative values of each climate were obtained: drought occurrence percentage (%O) and average intensity (AI). In the arid climate, the representative %O was 26.9, with a 0.446 AI. For the semiarid climate the %O decreased to 22.2 with an AI of 0.379. In the subhumid climate, both indicators fell, to 18.5 and 0.336, respectively. Lastly, in the humid climate the %O decreased to 16.4, but the AI increased slightly to 0.344. The analysis of the occurrences of droughts in the years analyzed enables drawing conclusions about their temporal distribution, yearly and spatially, within the state of San Luis Potosi, Mexico. Conducting these analyses in other regions of the country is recommended, due to the importance of those estimations in order to understand the behavior of meteorological droughts in a region or state.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[precipitación anual]]></kwd>
<kwd lng="es"><![CDATA[espectro climático]]></kwd>
<kwd lng="es"><![CDATA[pruebas estadísticas]]></kwd>
<kwd lng="es"><![CDATA[porcentaje de ocurrencias]]></kwd>
<kwd lng="es"><![CDATA[severidad de sequías]]></kwd>
<kwd lng="es"><![CDATA[déficit relativo de precipitación]]></kwd>
<kwd lng="es"><![CDATA[años de sequía]]></kwd>
<kwd lng="en"><![CDATA[Annual precipitation]]></kwd>
<kwd lng="en"><![CDATA[climate spectrum]]></kwd>
<kwd lng="en"><![CDATA[statistical tests]]></kwd>
<kwd lng="en"><![CDATA[percentage of occurrences]]></kwd>
<kwd lng="en"><![CDATA[drought severity]]></kwd>
<kwd lng="en"><![CDATA[relative precipitation deficit]]></kwd>
<kwd lng="en"><![CDATA[drought years]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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