<?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>S0187-62362020000400319</article-id>
<article-id pub-id-type="doi">10.20937/atm.52710</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evapotranspiration flux partitioning at a multi-species shrubland with stable isotopes of soil, plant, and atmosphere water pools]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tarin]]></surname>
<given-names><![CDATA[Tonantzin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yépez]]></surname>
<given-names><![CDATA[Enrico A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garatuza-Payan]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Julio C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez-Barroso]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Watts]]></surname>
<given-names><![CDATA[Christopher J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vivoni]]></surname>
<given-names><![CDATA[Enrique R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Sonora Departamento de Ciencias del Agua y Medio Ambiente ]]></institution>
<addr-line><![CDATA[Ciudad Obregón Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Delaware Department of Plant and Soil Sciences ]]></institution>
<addr-line><![CDATA[Newark Delaware]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Laboratorio Nacional de Geoquímica y Mineralogía Sede Regional Sur de Sonora ]]></institution>
<addr-line><![CDATA[Ciudad Obregón Sonora]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Sonora Departamento de Agricultura y Ganadería ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Sonora Departamento de Física ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Arizona State University School of Earth and Space Exploration ]]></institution>
<addr-line><![CDATA[ Arizona]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Arizona State University School of Sustainable Engineering and the Built Environment ]]></institution>
<addr-line><![CDATA[Tempe Arizona]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>33</volume>
<numero>4</numero>
<fpage>319</fpage>
<lpage>335</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362020000400319&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362020000400319&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362020000400319&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Evapotranspiration is the second largest component of the hydrological cycle after rainfall precipitation in semiarid regions such as northwestern Mexico. In this study, we partitioned the evapotranspiration (ET) flux using stable isotopes of water in the soil-plant-atmosphere continuum in combination with eddy covariance flux measurements. We considered three methods for determining the isotopic composition of transpiration (&#948;  T ): (1) isotopic steady state, (2) non-steady state, and (3) non-steady state weighting the relative importance of dominant species cover and accounting for the relative values of stomatal conductance. Three approaches of T/ET partitioning were estimated during several wet and dry days at the study site in Sonora, Mexico. The total ET flux was variable across years due to differences in precipitation amount between years. ET was lower during the drier-year and reached higher values during the wetter-year. Soil evaporation (E) dominated ET soon after large rain events (40 to 70 mm d-1 [DOY-196 and DOY-197] in 2008) but showed a rapid decrease in dominance as the soil surface dried. Estimated values of T/ET based on an isotopic mass balance were in the same range independent of three methods used. The mean T/ET ratio across all the periods studied was in the range of other studies in semiarid ecosystems and global trends with values of ~0.67 ± 0.02. This work contributes to a better understanding of the surface atmosphere interactions in semi-arid regions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La evapotranspiración es el segundo componente más grande del ciclo hidrológico, después de la precipitación, en regiones semiáridas como el noroeste de México. En este estudio, separamos el flujo de evapotranspiración (ET) usando isótopos estables de agua en el continuo suelo-planta-atmósfera en combinación con mediciones de flujo de covarianza de vórtices. Consideramos tres métodos para determinar la composición isotópica de la transpiración (&#948;  T ): 1) estado isotópico estable (ISS), 2) estado isotópico no estable (NSS), y 3) estado isotópico no estable ponderando la importancia relativa (RI) de la cobertura de especies dominantes y teniendo en cuenta los valores relativos de conductancia estomática. Se estimaron tres enfoques de separación T/ET durante varios días húmedos y secos en el sitio de estudio en Sonora, México. El flujo de ET total fue variable a lo largo de los años debido a las diferencias en la cantidad de precipitación entre años. ET fue menor durante el año más seco y alcanzó valores más altos durante el año más húmedo. La evaporación del suelo (E) dominó la ET poco después de grandes eventos de lluvia (40 a 70 mm d-1 [DOY-196 y DOY-197 en 2008]), pero mostró una rápida disminución a medida que se secaba la superficie del suelo. Los valores estimados de T/ET basados en un balance de masa isotópico estaban en el mismo rango, independientemente de los tres métodos utilizados. La relación T/ET media en todos los periodos estudiados estuvo en el rango de otros estudios en ecosistemas semiáridos y tendencias globales con valores de ~0.67 ± 0.02. Este trabajo contribuye a una mejor comprensión de las interacciones de la atmósfera superficial en las regiones semiáridas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ecohydrology]]></kwd>
<kwd lng="en"><![CDATA[subtropical ecosystem]]></kwd>
<kwd lng="en"><![CDATA[water availability]]></kwd>
<kwd lng="en"><![CDATA[Keeling plots]]></kwd>
<kwd lng="en"><![CDATA[North American monsoon]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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