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      <dc:title>Long-term aerosol optical hygroscopicity study at the ACTRIS SIRTA observatory: synergy between ceilometer and in situ measurements</dc:title>
      <dc:creator>Bedoya-Velásquez, Andrés Esteban</dc:creator>
      <dc:creator>Titos Vela, Gloria</dc:creator>
      <dc:creator>Bravo Aranda, Juan Antonio</dc:creator>
      <dc:creator>Casquero Vera, Juan Andrés</dc:creator>
      <dc:creator>Olmo Reyes, Francisco José</dc:creator>
      <dc:creator>Alados Arboledas, Lucas</dc:creator>
      <dc:creator>Guerrero Rascado, Juan Luis</dc:creator>
      <dc:description>An experimental setup to study aerosol hygroscopicity&#xd;
 is proposed based on the temporal evolution of attenuated&#xd;
 backscatter coefficients from a ceilometer colocated&#xd;
 with an instrumented tower equipped with meteorological&#xd;
 sensors at different heights. This setup is used to analyze&#xd;
 a 4.5-year database at the ACTRIS SIRTA observatory in&#xd;
 Palaiseau (Paris, France, 2.208 E, 48.713 N; 160m above&#xd;
 sea level). A strict criterion-based procedure has been established&#xd;
 to identify hygroscopic growth cases using ancillary&#xd;
 information, such as online chemical composition, resulting&#xd;
 in 8 hygroscopic growth cases from a total of 107 potential&#xd;
 cases. For these eight cases, hygroscopic growth-related&#xd;
 properties, such as the attenuated backscatter enhancement&#xd;
 factor fbeta (RH) and the hygroscopic growth coefficient y, are&#xd;
 evaluated. This study shows that the hygroscopicity parameter y is negatively correlated with the aerosol organic mass&#xd;
 fraction but shows a positive correlation with the aerosol inorganic&#xd;
 mass fraction. Among inorganic species, nitrate exhibited&#xd;
 the highest correlation.&#xd;
 This is the first time that hygroscopic enhancement factors&#xd;
 are directly retrieved under ambient aerosols using remotesensing&#xd;
 techniques, which are combined with online chemical&#xd;
 composition in situ measurements to evaluate the role of&#xd;
 the different aerosol species in aerosol hygroscopicity.</dc:description>
      <dc:date>2019-10-24T10:04:47Z</dc:date>
      <dc:date>2019-10-24T10:04:47Z</dc:date>
      <dc:date>2019-06-13</dc:date>
      <dc:type>info:eu-repo/semantics/article</dc:type>
      <dc:identifier>Bedoya-Velásquez, A. E., Titos, G., Bravo-Aranda, J. A., Haeffelin, M., Favez, O., Petit, J. E., ... &amp; Alados-Arboledas, L. (2019). Long-term aerosol optical hygroscopicity study at the ACTRIS SIRTA observatory: synergy between ceilometer and in situ measurements. Atmospheric Chemistry and Physics, 19(11), 7883-7896.</dc:identifier>
      <dc:identifier>http://hdl.handle.net/10481/57492</dc:identifier>
      <dc:identifier>10.5194/acp-19-7883-2019</dc:identifier>
      <dc:language>eng</dc:language>
      <dc:rights>http://creativecommons.org/licenses/by/3.0/es/</dc:rights>
      <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
      <dc:rights>Atribución 3.0 España</dc:rights>
      <dc:publisher>European Geosciences Union</dc:publisher>
   </ow:Publication>
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