<?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>S0187-62362017000300189</article-id>
<article-id pub-id-type="doi">10.20937/atm.2017.30.03.01</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Mapping recession risk for cultural heritage stone in Mexico City due to dry and wet deposition of urban air pollutants]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo-Miranda]]></surname>
<given-names><![CDATA[Javier Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Jardón]]></surname>
<given-names><![CDATA[Ricardo]]></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 contrib-type="author">
<name>
<surname><![CDATA[Mar-Morales]]></surname>
<given-names><![CDATA[Bertha E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Gómez]]></surname>
<given-names><![CDATA[Francisco Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Ruárez]]></surname>
<given-names><![CDATA[Luis Gerardo]]></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>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Química Departamento de Ingeniería Metalúrgica]]></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>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>189</fpage>
<lpage>207</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362017000300189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362017000300189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362017000300189&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Air pollution is a threat to cultural heritage because it accelerates the natural deterioration of monuments, palaces, churches, and archaeological ruins, which have an irreplaceable value. In the Mexico City Metropolitan Area (MCMA), there are 19 968 buildings registered as archaeological, historic, or artistic monuments. Some are built with calcareous rocks (limestone and marble) but many of them are made with andesite, tezontle and tuff stone. This paper reports for the first time the spatial distribution of the potential risk of deterioration on calcareous rocks in terms of surface recession with regard to Mexican cultural heritage in the MCMA for the base year 2007. The risk estimate was performed using Lipfert&#8217;s damage function, only applicable to carbonate stones of medium and low porosity. These include mainly medium/high density limestone and marble. Carrara white marble has a density of 2.69 g cm-3 and a porosity of 0.37%, and limestone has a density of 2.2-2.6 g cm-3 and a porosity of 5-20%. For high porosity (low density) limestone the function would be applicable with a potential under-estimation. In this function, annual recession rate is a function of annual averages of precipitation, pH, and dry deposition of SO2 and HNO3. Data from several meteorological monitoring networks, the MCMA air quality and acid deposition monitoring networks, and a 3D air quality model (MCCM) were interpolated in a GIS in order to obtain map layers for these variables. These overlaid maps were used to apply the Lipfert functions at the specific coordinates of a small sample of relevant historic or artistic monuments. The complexity of climate gradients, wind patterns, and emissions distribution within the Mexico Megacity leads to gradients as large as 50% in estimated recession rates using the Lipfert function at nearby sites made of the same type of building materials. The Comisión Ambiental de la Megalópolis (Environmental Commission of the Megacity) divides the MCMA into five sectors. Differences in recession rates between them were, in 1990, as large as those between estimated values for Oviedo, Paris, and Prague in Europe for the period 1980-2000. Recession rates decreased by about 50% from 1990 to 2007, the base year for this report, due to the success of air pollution control actions focused on the protection of public health. Nevertheless, strong recession gradients are still expected for carbonate stone within the MCMA. The recession values reported in this work must be taken as conservative estimates due to the not yet optimal performance of 3D air quality models in urban meteorology and the high degree of uncertainty in modeling emissions inventories. Most notable is the SO2 emissions inventory. These maps call for a program of experimental determination of recession rates for building materials that comprise a very large part of Mexico&#8217;s unique cultural heritage. These maps should also be added to the critical level maps obtained for human exposure, crops, and ecosystems in order to properly estimate the actual cost of air pollution in the MCMA and the area under its influence.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La contaminación del aire representa una amenaza para el patrimonio cultural, ya que acelera el deterioro natural de monumentos, edificaciones, iglesias y vestigios arqueológicos cuyo valor es irremplazable. En la Zona Metropolitana del Valle de México (ZMVM) hay 19 968 edificaciones registradas como monumentos arqueológicos, artísticos o históricos. Algunas de ellas están construidas con roca calcárea (piedra caliza o mármol); en muchas otras los materiales utilizados son andesita, tezontle y piedra volcánica. En este trabajo se analiza por primera vez la distribución espacial del riesgo potencial de deterioro de piedra calcárea en términos de erosión superficial, con relación al patrimonio cultural mexicano ubicado en la ZMVM para el año base 2007. Para estimar el riesgo se utilizó la función de daño de Lipfert, que sólo es aplicable a las piedras carbonatadas de baja y mediana porosidad, las cuales incluyen piedra caliza y marfil de densidad media a alta. El mármol blanco de Carrara tiene una densidad de 2.69 g cm-3 y una porosidad de 0.37%, en tanto que la piedra caliza tiene una densidad de 2.2-2.6 g cm-3 y una porosidad de 5-20%. En la piedra caliza de alta porosidad (baja densidad), la función sería aplicable con una subestimación potencial. En esta función, la tasa anual de erosión es a su vez una función de los promedios anuales de precipitación, pH, y deposición seca de SO2 y HNO3. Se interpolaron en un sistema de información geográfica datos de varias redes de monitoreo meteorológico, la red de monitoreo de calidad del aire y deposición ácida de la ZMVM, y un modelo en 3D de la misma ZMVM, con el fin de obtener capas de mapa para estas variables. Estos mapas superpuestos se usaron para aplicar las funciones de Lipfert a coordenadas específicas de una pequeña muestra de monumentos artísticos o históricos relevantes. La complejidad de los gradientes de clima, patrones de vientos y distribución de emisiones dentro de la megalópolis mexicana inducen gradientes de hasta 50% en las tasas de erosión estimadas con la función de Lipfert en sitios cercanos en los cuales se utilizaron los mismos materiales de construcción. La Comisión Ambiental de la Megalópolis divide la ZMVM en cinco sectores. En 1990, las diferencias en las tasas de erosión entre dichas zonas eran tan amplias como las existentes entre los valores estimados para Oviedo, París y Praga en Europa durante el periodo 1980-2000. Las tasas de erosión disminuyeron alrededor de 50% de 1997 a 2007 (el año base para este informe) gracias al éxito de las acciones de control de la contaminación del aire enfocadas a la protección de la salud pública. No obstante, aún se esperan altos gradientes de erosión para las piedras carbonatadas dentro de la ZMVM. Los valores de erosión reportados en este trabajo deben tomarse como estimaciones conservadores debido al desempeño aún imperfecto de los modelos 3D de calidad del aire en la meteorología urbana, así como al alto grado de incertidumbre en la modelación de inventarios de emisiones. En este sentido, el más notable es el inventario de emisiones de SO2. Estos mapas obligan a la creación de un programa para la determinación experimental de tasas de erosión que abarquen gran parte del singular patrimonio cultural mexicano; asimismo, deben añadirse a los mapas de niveles críticos obtenidos para la exposición de personal, cultivos y ecosistemas con el fin de estimar de forma adecuada el costo real de la contaminación del aire en la ZMVM y su área circundante.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cultural heritage]]></kwd>
<kwd lng="en"><![CDATA[air pollution]]></kwd>
<kwd lng="en"><![CDATA[MCMA]]></kwd>
<kwd lng="en"><![CDATA[Mexico Megacity]]></kwd>
<kwd lng="en"><![CDATA[recession rates]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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