<?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>S0187-62362019000400305</article-id>
<article-id pub-id-type="doi">10.20937/atm.2019.32.04.04</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Ozone variation during a case of cyclogenesis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Basset]]></surname>
<given-names><![CDATA[H. Abdel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Badawy]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Eid]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Al-Azhar University Faculty of Science Department of Astronomy and Meteorology]]></institution>
<addr-line><![CDATA[Cairo ]]></addr-line>
<country>Egypt</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Egyptian Meteorological Authority  ]]></institution>
<addr-line><![CDATA[Cairo ]]></addr-line>
<country>Egypt</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>32</volume>
<numero>4</numero>
<fpage>305</fpage>
<lpage>322</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362019000400305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362019000400305&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362019000400305&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The relationship between total column ozone (TCO) and the development of a cyclonic system that occurred in the period from January 18 to January 25, 1981 has been studied using the ERA-Interim reanalysis database. It was found that TCO increases and decreases with the development and weakening of the cyclonic system. Also, a good correlation between TCO and the thickness of the layer was found between 1000-100 hPa and tropopause pressure. The study of daily variations in TCO based on the vertical distribution of the ozone mass mixing ratio (OMR) illustrate that with the beginning of the growth period there is a high decrease of the tropopause height, which was associated to high deepening of the cyclone and was accompanied by a significant vertical increase of OMR in the troposphere and stratosphere. The obvious significant increase of OMR starts at the stratospheric layer and is then transported to the tropospheric layer. The analysis of the time-height variation of the differences of OMR between the average of the domain containing the center of the cyclone at each level and the corresponding monthly average, illustrates that during the days of maximum deepening the positive values of OMR extend downwards to reach the 850 hPa level. The increase in positive values continues to be higher in the upper levels and reaches maximum values between 300-100 hPa and also between the 60-10 hPa layer. The characteristics of these changes of OMR concentrations from layer to layer are predominantly due to dynamical processes. Also, this was attributed to the effect of horizontal advection of ozone from a different neighboring region into the column, and by a vertical exchange of air between the high ozone at the stratosphere and low ozone at troposphere.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se estudió la relación entre el ozono total en columna (TCO, por sus siglas en inglés) y el desarrollo de un sistema ciclónico que se presentó entre el 18 y el 25 de enero de 1981, utilizando para ello la base de datos del reanálisis ERA-Interim. Se encontró que el TCO aumenta y disminuye con el desarrollo y debilitamiento del sistema ciclónico. También se encontró una buena correlación entre el TCO y el grosor de la capa de 1000 a 100 hPa y la presión de la tropopausa. El estudio de las variaciones diarias del TCO con base en la distribución vertical de la razón de mezcla de la masa de ozono (OMR, por sus siglas en inglés) demuestra que al inicio del periodo de crecimiento hay una importante disminución en la altura de la tropopausa asociada con la intensificación del ciclón y acompañada de un aumento vertical significativo de la OMR en la troposfera y la estratosfera. El aumento obviamente significativo de la OMR empieza en la capa estratosférica y después se traslada a la troposfera. El análisis de la variación en la altura de la OMR con relación al tiempo, respecto del promedio del dominio donde se ubica el centro del ciclón y el correspondiente promedio mensual, demuestran que en los días de máxima intensificación los valores positivos de la OMR se extienden hacia abajo hasta alcanzar el nivel de los 850 hPa. El incremento de los valores positivos de la OMR continúa siendo mayor en los niveles superiores y alcanza valores máximos entre 300 y 100 hPa, así como en la capa de 60-10 hPa. Las características de estos cambios en las concentraciones de la OMR entre capas se deben a procesos dinámicos, al efecto de la advección horizontal de ozono desde una región cercana hacia el interior de la columna, y al intercambio vertical de aire entre el ozono estratosférico y el troposférico.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[total column ozone]]></kwd>
<kwd lng="en"><![CDATA[cyclone]]></kwd>
<kwd lng="en"><![CDATA[cyclogenesis]]></kwd>
<kwd lng="en"><![CDATA[tropopause pressure]]></kwd>
<kwd lng="en"><![CDATA[atmospheric thickness]]></kwd>
<kwd lng="en"><![CDATA[stratosphere]]></kwd>
<kwd lng="en"><![CDATA[troposphere]]></kwd>
<kwd lng="en"><![CDATA[ozone mixing ratio]]></kwd>
</kwd-group>
</article-meta>
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