<?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>S0187-62362023000300110</article-id>
<article-id pub-id-type="doi">10.20937/atm.53134</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The influence of snow cover on Ozone Monitor Instrument formaldehyde observations]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Howlett]]></surname>
<given-names><![CDATA[CareyAnne]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Abad]]></surname>
<given-names><![CDATA[Gonzalo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chan Miller]]></surname>
<given-names><![CDATA[Christopher]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nowlan]]></surname>
<given-names><![CDATA[Caroline Rebecca]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayazpour]]></surname>
<given-names><![CDATA[Zolal]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[Lei]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Northeastern University Khoury College of Computer Science ]]></institution>
<addr-line><![CDATA[Boston MA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Harvard-Smithsonian Center for Astrophysics  ]]></institution>
<addr-line><![CDATA[Cambridge MA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Harvard University John A. Paulson School of Engineering and Applied Sciences ]]></institution>
<addr-line><![CDATA[Cambridge MA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University at Buffalo Structural and Environmental Engineering Department of Civil]]></institution>
<addr-line><![CDATA[Buffalo NY]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Southern University of Science and Technology School of Environmental Science and Engineering ]]></institution>
<addr-line><![CDATA[Shenzhen Guangdong]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>37</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362023000300110&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362023000300110&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362023000300110&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Formaldehyde (HCHO) is measured from space using backscattered ultraviolet sun-light. Because of HCHO&#8217;s short lifetime, space-based observations of HCHO can serve as a proxy for volatile organic compounds, helping to characterize their global emissions and distributions. HCHO satellite observations rely on air mass factor (AMF) calculations to transform fitted slant columns into vertical column densities (VCD&#8217;s). Most HCHO satellite products do not explicitly consider the presence of snow on the ground during the calculation of AMFs. In this study, we leverage information from the Moderate-Resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF), MODIS snow cover information, and the Interactive Multisensor Snow and Ice Mapping System to evaluate the impact of ground snow on Ozone Monitoring Instrument (OMI) HCHO retrievals. We focus our analysis on the year 2005. We compare AMFs computed using daily MODIS BRDF to AMFs computed using OMI&#8217;s surface reflectance climatology, the baseline for NASA&#8217;s OMHCHO product. Over snow-covered regions, both sets of AMFs show significant differences. We observe two different behaviors. Regions with permanent snow cover (Greenland and Antarctica) show smaller AMFs calculated with MODIS BRDF than with the OMI climatology resulting in a 6% median annual increase of HCHO VCDs. Over regions with seasonal snow cover, the situation is more complex with more variability in the differences during the year. For example, a February 2005 case study over Europe shows that the NASA OMHCHO VCDs (calculated using the OMI Lambertian climatology) are on average 16% larger than HCHO columns retrieved using daily MODIS BRDF information.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La concentración de formaldehido (HCHO) se puede medir desde el espacio usando luz solar ultravioleta. Dada su corta vida media, el HCHO se usa como indicador de la presencia de compuestos orgánicos volátiles, ayudando a caracterizar sus emisiones y distribución a escala global. Las observaciones de HCHO desde satélites requieren el cálculo el de los factores de masa de aire (AMF, por su sigla en inglés) para convertir densidades de columnas inclinadas a densidades de columnas verticales (VCD). La mayor parte de los productos satelitales de HCHO no consideran de manera explícita la presencia de nieve en la superficie de la tierra. En este estudio, usamos información del Espectrorradiómetro de Imágenes de Media Resolución (MODIS) sobre la función de distribución bidireccional de la reflexión (BRDF) y de la cobertura de nieve facilitada por el Sistema Multisensor Interactivo de Mapeo de Nieve y Hielo para evaluar el impacto de la nieve en superficie sobre las observaciones de HCHO realizadas por el Instrumento de Monitoreo de Ozono (OMI). Centramos nuestro análisis en 2005. Comparamos los AMF calculados usando MODIS BRDF con los AMF calculados usando la climatología de reflexión lambertiana del OMI (la información a priori utilizada por el producto operacional de la NASA, OMHCHO). Las diferencias entre ambos cálculos son importantes en regiones nevadas. Podemos distinguir claramente dos situaciones: en regiones permanentemente nevadas (Groenlandia y la Antártida) los AMF calculados usando MODIS BRDF son menores que los calculados con la climatología de OMI, lo que conduce a un incremento medio anual de 6% en los VCD de HCHO. Sobre regiones con cobertura de nieve estacional la situación es más compleja. Por ejemplo, en un estudio de caso realizado sobre Europa en febrero de 2005, los VCD del producto OMHCHO de la NASA (usando la climatología lambertiana del OMI) fueron en promedio 16% mayores que nuestros cálculos realizados usando datos diarios de MODIS BRDF.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[OMI]]></kwd>
<kwd lng="en"><![CDATA[formaldehyde]]></kwd>
<kwd lng="en"><![CDATA[MODIS]]></kwd>
<kwd lng="en"><![CDATA[BRDF]]></kwd>
<kwd lng="en"><![CDATA[snow]]></kwd>
<kwd lng="en"><![CDATA[ice]]></kwd>
<kwd lng="en"><![CDATA[air mass factor]]></kwd>
</kwd-group>
</article-meta>
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