<?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>S0187-62362021000300311</article-id>
<article-id pub-id-type="doi">10.20937/atm.52804</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Meteorological data assimilation for air quality modeling with WRF-Chem: Central Mexico case study]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Sabari]]></surname>
<given-names><![CDATA[Evelyn Elisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Reynoso]]></surname>
<given-names><![CDATA[José Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Ciencias de la Atmósfera ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></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>311</fpage>
<lpage>336</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362021000300311&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362021000300311&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362021000300311&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Meteorological data assimilation from surface observations (PREPBUFR) and satellite radiance (BUFR) provided by the National Centers for Environmental Prediction (NCEP) is carried out to determine their possible influence on chemical variables concentrations such as ozone (O3), obtained from air quality modeling over central Mexico using the photochemical Weather Research and Forecasting Model with Chemistry (WRF-Chem) during a bad-pollution event due to high O3 concentrations in the Mexico City Metropolitan Area on May 1-4, 2013. For this, the Weather Research and Forecasting Data Assimilation (WRFDA) module was adapted to run with WRF-Chem, and the 3DVAR assimilation technique (which is implemented in the WRFDA) was selected. Six study cases were defined taking into account the combination of the data source type with the assimilation process start times (00:00 and 12:00 UTC). Results indicate that independently of these factors, data assimilation modifies in general the meteorological variables (temperature and wind) initial conditions to obtain a better agreement between model simulations and observations, although statistics results are even higher when the process starts at 12:00 UTC using a combination of PREPBUFR and BUFR data (PB+RD cases). It was also verified that there is an influence on O3 concentrations since the statistical metrics obtained for the different experiments carried out are modified; however, it is insufficient to considerably improve the chemical variable model performance.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se realiza la asimilación de datos meteorológicos procedentes de observaciones de superficie (PREPBUFR) y radiancia de satélites (BUFR) obtenidos de los Centros Nacionales de Predicción Ambiental (NCEP) de EUA para determinar su posible influencia en las concentraciones de variables químicas como el ozono (O3), resultado de la modelación de la calidad del aire en el centro de México empleando el modelo fotoquímico de Investigación y Pronóstico del Tiempo con Química (WRF-Chem) durante una contingencia ambiental por O3 declarada en la Zona Metropolitana de la Ciudad de México, del 1 al 4 de mayo de 2013. Para ello se adaptó a WRF-Chem el módulo de asimilación de datos de WRF (WRFDA) y se seleccionó la técnica de asimilación con variación en tres dimensiones (3DVAR) implementada en dicho módulo. Se definen seis casos de estudio tomando en cuenta la combinación del tipo de fuente de datos con el horario de comienzo del proceso de asimilación (00:00 y 12:00 UTC). Los resultados indican que, de modo general e independientemente de estos factores, la asimilación modifica las condiciones iniciales de las variables meteorológicas estudiadas (temperatura y viento) para obtener una mejor correspondencia entre las salidas del modelo y las observaciones, si bien iniciando a las 00:00 UTC y empleando una combinación de datos PREPBUFR más BUFR (caso PB+RD) los resultados estadísticos son incluso superiores. También se comprueba que sí hay influencia sobre las concentraciones de O3, ya que las métricas estadísticas obtenidas para los distintos experimentos realizados indican modificación; sin embargo, es insuficiente para mejorar considerablemente el desempeño del modelo para esta variable química.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[WRFDA]]></kwd>
<kwd lng="en"><![CDATA[WRF-Chem]]></kwd>
<kwd lng="en"><![CDATA[3DVAR]]></kwd>
<kwd lng="en"><![CDATA[meteorological data assimilation]]></kwd>
</kwd-group>
</article-meta>
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