<?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>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082019000100133</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.697</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización de la turbulencia atmosférica en una gran zona verde de una megaciudad andina tropical]]></article-title>
<article-title xml:lang="en"><![CDATA[Characterization of the atmospheric turbulence in a tropical Andes megacity large urban park]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[Edison Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jimenez]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fochesatto]]></surname>
<given-names><![CDATA[Gilberto J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Rincon]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Ingeniería Química y Ambiental Grupo de Investigación en Calidad del Aire]]></institution>
<addr-line><![CDATA[Bogotá D.C ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Alaska Geophysical Institute, and Department of Atmospheric Sciences ]]></institution>
<addr-line><![CDATA[Fairbanks ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2019</year>
</pub-date>
<volume>43</volume>
<numero>166</numero>
<fpage>133</fpage>
<lpage>145</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082019000100133&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082019000100133&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082019000100133&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La turbulencia generada por las interacciones superficie-atmósfera, y su disipación, determinan en gran parte la dispersión de contaminantes y, por lo tanto, su impacto en la salud pública. La parametrización de la turbulencia en los modelos de transporte y dispersión de contaminantes ha sido observacionalmente obtenida y validada principalmente en latitudes medias, pero muy poco en el trópico. En este artículo se reporta la caracterización estadística de la turbulencia atmosférica en un sitio representativo del Área Metropolitana de Bogotá - Colombia (4°39'30.48"N, 74°5'2.38"O, 2577 m s.n.m.m.), una megaciudad andina tropical, a partir de mediciones de alta frecuencia con un anemómetro ultrasónico de tres ejes, validado en exposición y operado a 10 Hz, a 7.8 m de altura, entre agosto y noviembre del 2014. El análisis revela que, durante el periodo de medición, la turbulencia lateral en Bogotá, expresada como desviación estándar, fue elevada y comparable a la turbulencia longitudinal ( ), lo que caracteriza su atmósfera como horizontalmente isotrópica. Las intensidades turbulentas observadas (   ) fueron ~2 a ~3 veces más altas que las reportadas para latitudes medias a las bajas velocidades del viento en Bogotá. El análisis espectral es consistente con el estadístico, con espectros longitudinales y verticales comparables a los reportados para condiciones neutrales a ligeramente inestables, y espectros laterales con frecuencias pico de un orden de magnitud menor que los reportados en la literatura, lo que indica una elevada producción de turbulencia lateral. Se estima que los remolinos al inicio de la cascada de energía tuvieron longitudes características de ~120 m y ~10 m en los planos horizontal y vertical, respectivamente. © 2019. Acad. Colomb. Cienc. Ex. Fis. Nat.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The turbulence produced by surface-atmosphere interactions and its dissipation largely determine the dispersion of pollutants and, therefore, their public health impact. Turbulence parameterizations in pollutant transport and dispersion models have been observationally obtained and validated mainly for mid-latitudes, but very little for the tropics. In this article, we report the statistical characterization of the atmospheric turbulence at a representative site of the Metropolitan Area of Bogota - Colombia (4°39'30.48"N, 74°5'2.38"W, 2577 m ASL), a tropical Andean megacity, using high frequency measurements obtained with a 3-axis ultrasonic anemometer validated for exposure and operated at 10 Hz, at 7.8 m height between August and November 2014. Our analysis reveals that during the measurement period the lateral turbulence in Bogota, expressed as standard deviation, was high and comparable to the longitudinal turbulence ( ), which characterizes its atmosphere as horizontally isotropic. The turbulent intensities observed ( ) were ~2 to ~3 times higher than those reported for mid-latitudes at the low wind speeds at Bogota. The spectral analysis was consistent with the statistical one, with longitudinal and vertical spectra comparable to those reported for neutral to slightly unstable conditions, and lateral spectra with peak frequencies an order of magnitude lower than the reported in the literature, which indicates high production of lateral turbulence. We estimate that the eddies at the beginning of the energy cascade had characteristic lengths of ~120 m and ~10 m in the horizontal and vertical, respectively. © 2019. Acad. Colomb. Cienc. Ex. Fis. Nat.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Andes tropicales]]></kwd>
<kwd lng="es"><![CDATA[Turbulencia atmosférica]]></kwd>
<kwd lng="es"><![CDATA[Anemómetro ultrasónico]]></kwd>
<kwd lng="es"><![CDATA[Energía cinética turbulenta]]></kwd>
<kwd lng="es"><![CDATA[Escalas de tiempo y longitud]]></kwd>
<kwd lng="es"><![CDATA[Espectros de energía]]></kwd>
<kwd lng="en"><![CDATA[Tropical Andes]]></kwd>
<kwd lng="en"><![CDATA[Atmospheric turbulence]]></kwd>
<kwd lng="en"><![CDATA[Ultrasonic anemometer]]></kwd>
<kwd lng="en"><![CDATA[Turbulent kinetic energy]]></kwd>
<kwd lng="en"><![CDATA[Time and length scales]]></kwd>
<kwd lng="en"><![CDATA[Energy spectra]]></kwd>
</kwd-group>
</article-meta>
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