<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2011000100010</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On the phenomenology underlying Taylor's hypothesis in atmospheric turbulence]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[J.J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carsteanu]]></surname>
<given-names><![CDATA[A.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fuentes]]></surname>
<given-names><![CDATA[J.D]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados Departamento de Física]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas Departamento de Matemáticas]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,The Pennsylvania State University Department of Meteorology ]]></institution>
<addr-line><![CDATA[ PA]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>1</numero>
<fpage>60</fpage>
<lpage>64</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[G.I. Taylor's hypothesis of transposition of turbulent statistics from the spatial to the temporal domain (and vice-versa) is usually explained in terms of smaller features being advected by a large-scale transport velocity, while intrinsic temporal velocity fluctuations are slower than the corresponding inertial terms, and turbulent velocity fluctuations remain small in comparison with the transport velocity. This formulation, widely known as "frozen turbulence", is undoubtedly correct in laboratory experiments where the stated conditions are being fulfilled, and perhaps in many natural settings. However, temporal structure functions of measured velocities in the atmospheric boundary layer during periods of higher transport velocities (tropical day time), when compared with periods of low activity (night time), show a very similar behavior, hereby raising the question whether the space-time similarity of turbulent fluctuations in terms of statistical moments is really due only to transport-like advection, or there might exist a different underlying phenomenology leading to the same result, and accounting for the behavior during low-advection periods. Based on the multifractality observed in the structure functions, the alternative explanation of a 4-D space-time multifractal field is suggested.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La hipótesis de G.I. Taylor con respecto a la transposición de estadísticas del dominio espacial al dominio temporal (y viceversa) en turbulencia, se explica generalmente en términos de las estructuras turbulentas más pequeñas siendo arrastradas por una velocidad de transporte a escalas grandes, mientras que las fluctuaciones de velocidad intrínsicamente temporales sean más lentas que sus contrapartes inerciales y las fluctuaciones turbulentas de velocidad sean despreciables en comparación con la velocidad de transporte. Esta explicación, comunmente conocida como "turbulencia congelada", es sin duda correcta en el caso de aquellos experimentos de laboratorio donde se cumplen las condiciones enunciadas, así como en ciertos casos que ocurren en la naturaleza. Sin embargo, las funciones estructurales de las variaciones temporales de velocidad en la capa límite atmosfírica durante períodos con velocidades de transporte más altas (mañanas tropicales), se muestran muy parecidas a las calculadas para períodos de baja intensidad de viento (noches), suscitando así la cuestión si realmente la similaridad espacio-temporal de los momentos estadísticos de las fluctuaciones turbulentas de velocidad se debe a una advección, o bien podría existir otra fenomenología subyacente que llevara al mismo resultado estadístico, pero que pudiese explicar también el mismo comportamiento durante los períodos de baja advección. Basados en la multifractalidad observada en las funciones estructurales, proponemos una explicación alternativa, involucrando un campo multifractal espacio-temporal.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Boundary layer processes]]></kwd>
<kwd lng="en"><![CDATA[multifractal field]]></kwd>
<kwd lng="en"><![CDATA[Taylor's hypothesis]]></kwd>
<kwd lng="en"><![CDATA[turbulence]]></kwd>
<kwd lng="es"><![CDATA[Capa límite]]></kwd>
<kwd lng="es"><![CDATA[campo multifractal]]></kwd>
<kwd lng="es"><![CDATA[hipótesis de Taylor]]></kwd>
<kwd lng="es"><![CDATA[turbulencia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>On the phenomenology underlying Taylor's hypothesis in atmospheric turbulence</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>J.J. Castro&ordf;, A.A. Carsteanu<sup>b</sup> and J.D. Fuentes<sup>c</sup></b></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>a </sup>Departamento de F&iacute;sica, Centro de Investigaci&oacute;n y de Estudios Avanzados del Instituto Polit&eacute;cnico Nacional, Apartado Postal 14&#150;740, M&eacute;xico, D.F., 07000, M&eacute;xico, e&#150;mail:</i> <a href="mailto:jjcastro@fis.cinvestav.mx">jjcastro@fis.cinvestav.mx</a>.</font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>b </sup>Departamento de Matem&aacute;ticas, Escuela Superior de F&iacute;sica y Matem&aacute;ticas del Instituto Polit&eacute;cnico Nacional, U.P. Adolfo L&oacute;pez Mateos, Edif. 9, M&eacute;xico, D.F., 07738, M&eacute;xico.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Department of Meteorology, The Pennsylvania State University, University Park, PA 16802, USA.</i></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Recibido el 20 de agosto de 2010    <br>     Aceptado el 14 de octubre de 2010</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p> 	    <p align="justify"><font face="verdana" size="2">G.I. Taylor's hypothesis of transposition of turbulent statistics from the spatial to the temporal domain (and vice&#150;versa) is usually explained in terms of smaller features being advected by a large&#150;scale transport velocity, while intrinsic temporal velocity fluctuations are slower than the corresponding inertial terms, and turbulent velocity fluctuations remain small in comparison with the transport velocity. This formulation, widely known as "frozen turbulence", is undoubtedly correct in laboratory experiments where the stated conditions are being fulfilled, and perhaps in many natural settings. However, temporal structure functions of measured velocities in the atmospheric boundary layer during periods of higher transport velocities (tropical day time), when compared with periods of low activity (night time), show a very similar behavior, hereby raising the question whether the space&#150;time similarity of turbulent fluctuations in terms of statistical moments is really due only to transport&#150;like advection, or there might exist a different underlying phenomenology leading to the same result, and accounting for the behavior during low&#150;advection periods. Based on the multifractality observed in the structure functions, the alternative explanation of a 4&#150;D space&#150;time multifractal field is suggested.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Boundary layer processes; multifractal field; Taylor's hypothesis; turbulence.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p> 	    <p align="justify"><font face="verdana" size="2">La hip&oacute;tesis de G.I. Taylor con respecto a la transposici&oacute;n de estad&iacute;sticas del dominio espacial al dominio temporal (y viceversa) en turbulencia, se explica generalmente en t&eacute;rminos de las estructuras turbulentas m&aacute;s peque&ntilde;as siendo arrastradas por una velocidad de transporte a escalas grandes, mientras que las fluctuaciones de velocidad intr&iacute;nsicamente temporales sean m&aacute;s lentas que sus contrapartes inerciales y las fluctuaciones turbulentas de velocidad sean despreciables en comparaci&oacute;n con la velocidad de transporte. Esta explicaci&oacute;n, comunmente conocida como "turbulencia congelada", es sin duda correcta en el caso de aquellos experimentos de laboratorio donde se cumplen las condiciones enunciadas, as&iacute; como en ciertos casos que ocurren en la naturaleza. Sin embargo, las funciones estructurales de las variaciones temporales de velocidad en la capa l&iacute;mite atmosf&iacute;rica durante per&iacute;odos con velocidades de transporte m&aacute;s altas (ma&ntilde;anas tropicales), se muestran muy parecidas a las calculadas para per&iacute;odos de baja intensidad de viento (noches), suscitando as&iacute; la cuesti&oacute;n si realmente la similaridad espacio&#150;temporal de los momentos estad&iacute;sticos de las fluctuaciones turbulentas de velocidad se debe a una advecci&oacute;n, o bien podr&iacute;a existir otra fenomenolog&iacute;a subyacente que llevara al mismo resultado estad&iacute;stico, pero que pudiese explicar tambi&eacute;n el mismo comportamiento durante los per&iacute;odos de baja advecci&oacute;n. Basados en la multifractalidad observada en las funciones estructurales, proponemos una explicaci&oacute;n alternativa, involucrando un campo multifractal espacio&#150;temporal.</font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Capa l&iacute;mite; campo multifractal; hip&oacute;tesis de Taylor; turbulencia.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">PACS: 44.25.+f; 47.27.eb; 47.53.+n</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v57n1//v57n1a10.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgments</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Jorge Castro and Alin Carsteanu acknowledge the CONACYT&#150;SEMARNAT Grant C01&#150;0306/2002. J.D. Fuentes acknowledges the support received from NASA to participate in the TRMM&#150;LBA project.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p> 	    ]]></body>
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