<?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>S0187-62362022000100027</article-id>
<article-id pub-id-type="doi">10.20937/atm.52919</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The anomalous wet 2020 southeast Brazil austral summer: Characterization and possible mechanisms]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vasconcellos]]></surname>
<given-names><![CDATA[Fernanda Cerqueira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Souza]]></surname>
<given-names><![CDATA[Juan Neres De]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Rio de Janeiro Instituto de Geociências Departamento de Meteorologia]]></institution>
<addr-line><![CDATA[Rio de Janeiro ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>27</fpage>
<lpage>38</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362022000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362022000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362022000100027&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This paper analyzed the anomalous rainy austral summer of 2020 over the southeastern region of Brazil (SEB), investigating its possible mechanisms. The SEB experienced dry summers in the years before 2020; however, the austral summer of 2020 in this region was the wettest since 1991. A wave train starting from the Indian Ocean to the Pacific Ocean, plus a wave train from the tropical north (U-shape), and another from the western equatorial Pacific (PSA-like) contributed to an anomalous anticyclonic circulation at high levels southward South America. This merged wave train continued its path with an anomalous cyclonic circulation over the southern region of Brazil and the state of Sao Paulo, and anticyclonic northward, enhancing (inhibiting) convection over SEB (southern Brazil). Besides, the Southern Annular Mode (SAM) pattern was in a positive phase, and there were negative sea surface temperature (SST) anomalies near SEB and Argentina, contributing for the configuration over the continent. Comparisons of the main differences between the austral summer of 2019 (dry) and the summer of 2020 show there was no anomalous divergence at high levels over the Indian Ocean in 2019, triggering a wave train from this region to the Pacific. The two wave trains from the Pacific merged in an anomalous anticyclonic circulation over the southeastern Pacific, near the South American coast. The SAM pattern was neutral in 2019; however, there were positive SST anomalies near SEB, southern Brazil and Argentina coastal. The South Atlantic SST and the wave trains generated an anticyclonic anomalous circulation over the southern region of Brazil and cyclonic northward, in opposition to the 2020 configuration.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se analizan las anomalías del verano austral húmedo de 2020 en el sudeste de Brasil (SEB) y se investigan sus posibles mecanismos. En los años previos a 2020 se registraron veranos secos en el SEB; no obstante, el verano de 2020 fue el más lluvioso desde 1991. Un tren de ondas iniciado en el océano Índico con dirección al océano Pacífico, más un tren de ondas del norte tropical (con forma de U) y otro del Pacífico ecuatorial occidental (similar al patrón Pacífico-América del Sur), contribuyeron a una circulación anticiclónica anómala en altos niveles hacia el sur de Sudamérica. Este tren de ondas combinado continuó su trayectoria como circulación ciclónica anómala sobre el sur de Brasil y el estado de Sao Paulo, y como circulación anticiclónica hacia el norte, acentuando/inhibiendo la convección sobre el SEB. Por otra parte, el patrón del Modo Anular del Sur (SAM, por sus siglas en inglés) se encontraba en fase positiva y se detectó la presencia de anomalías negativas en la temperatura superficial del mar (SST) cerca del SEB y Argentina, lo cual contribuyó a la configuración del fenómeno sobre el continente. Comparaciones entre el verano austral de 2019 (seco) y el de 2020 para establecer sus principales diferencias muestran que no hubo una divergencia anómala en altos niveles sobre el océano Pacífico en 2019 que haya desencadenado un tren de ondas de esta región al Pacífico. Los dos trenes de ondas procedentes del Pacífico se combinaron como circulación anticiclónica anómala sobre el Pacífico sudoccidental, cerca de la costa de Sudamérica. El SAM fue neutral en 2019; sin embargo, hubo anomalías positivas de la SST cerca del SEB, el sur de Brasil y la costa de Argentina. La SST del Atlántico sur y los trenes de ondas generaron una circulación anticiclónica anómala sobre el sur de Brasil y ciclónica hacia el norte, en contraposición con la configuración de 2020.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[southeastern Brazil]]></kwd>
<kwd lng="en"><![CDATA[wavetrain]]></kwd>
<kwd lng="en"><![CDATA[Atlantic SST]]></kwd>
<kwd lng="en"><![CDATA[Southern Annular Mode]]></kwd>
</kwd-group>
</article-meta>
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