<?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>0187-6236</journal-id>
<journal-title><![CDATA[Atmósfera]]></journal-title>
<abbrev-journal-title><![CDATA[Atmósfera]]></abbrev-journal-title>
<issn>0187-6236</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-62362021000300357</article-id>
<article-id pub-id-type="doi">10.20937/atm.52737</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Modeling photosynthetically active radiation: A review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noriega Gardea]]></surname>
<given-names><![CDATA[Moisés Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corral Martínez]]></surname>
<given-names><![CDATA[Luis Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anguiano Morales]]></surname>
<given-names><![CDATA[Marcelino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trujillo Schiaffino]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salas Peimbert]]></surname>
<given-names><![CDATA[Didia Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Tecnológico Nacional de México Instituto Tecnológico de Chihuahua División de Estudios de Posgrado e Investigación]]></institution>
<addr-line><![CDATA[Chihuahua Chihuahua]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>34</volume>
<numero>3</numero>
<fpage>357</fpage>
<lpage>370</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362021000300357&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362021000300357&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362021000300357&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Photosynthetically active radiation (PAR) is important in applications related to plant physiology or the carbon cycle. However, despite its importance, a global network for its measurement has not yet been established. This work consists of the revision of a series of works related to the development of empirical models for the estimation of PAR in places where it is not regularly measured, using for this purpose measurements of meteorological and radiation parameters available in weather stations. A list of the models developed, the study site, the results obtained, and the nomenclature used in each of them is made. The most common way to develop empirical estimation models is by studying spatio-temporal changes in the relationship between PAR and global solar radiation. Other estimation methods include the use of satellite-derived products such as MODIS-derived products and the use of artificial neural networks. Despite being more efficient for estimating PAR, the use of artificial neural networks is not as widespread because its use is more complex than the development of empirical models. The PAR to global solar radiation ratio reached its maximum in the summer months and the minimum in the winter months; in addition, the daily values per hour reached their maximum at sunrise and sunset, and their minimum around noon.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La radiación fotosintéticamente activa (PAR) es importante en aplicaciones referentes a la fisiología de las plantas o el ciclo del carbono. No obstante, aún no se ha establecido una red global para su medición a pesar de su importancia. En este trabajo se revisa una serie de estudios referentes a la creación de modelos empíricos para la estimación de la radiación PAR en lugares donde no es medida con regularidad, utilizando para ello datos de parámetros meteorológicos y de radiación disponibles en estaciones meteorológicas. Se hace un listado de los modelos desarrollados, el sitio de estudio, los resultados obtenidos y la nomenclatura utilizada en cada uno de ellos. La manera más común de elaborar modelos empíricos de estimación es mediante el estudio de los cambios espaciotemporales en la relación entre la radiación PAR y la radiación solar global. Otros métodos de estimación incluyen el uso de productos derivados de satélites como los del satélite MODIS, así como el uso de redes neuronales artificiales. No obstante, a pesar de que estas últimas son más eficientes para la estimación de la radiación PAR, su uso no es tan extendido porque es más complejo que el desarrollo de modelos empíricos. La relación entre la radiación PAR y la radiación solar global alcanzó sus máximos en los meses de verano y los mínimos en los meses de invierno; además, los valores diarios por hora alcanzaron sus máximos al amanecer y al atardecer y sus mínimos alrededor del mediodía.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[photosynthetically active radiation]]></kwd>
<kwd lng="en"><![CDATA[radiometry]]></kwd>
<kwd lng="en"><![CDATA[estimation models]]></kwd>
<kwd lng="en"><![CDATA[meteorological parameters]]></kwd>
</kwd-group>
</article-meta>
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