@misc{10481/57492,
year = {2019},
month = {6},
url = {http://hdl.handle.net/10481/57492},
abstract = {An experimental setup to study aerosol hygroscopicity
 is proposed based on the temporal evolution of attenuated
 backscatter coefficients from a ceilometer colocated
 with an instrumented tower equipped with meteorological
 sensors at different heights. This setup is used to analyze
 a 4.5-year database at the ACTRIS SIRTA observatory in
 Palaiseau (Paris, France, 2.208 E, 48.713 N; 160m above
 sea level). A strict criterion-based procedure has been established
 to identify hygroscopic growth cases using ancillary
 information, such as online chemical composition, resulting
 in 8 hygroscopic growth cases from a total of 107 potential
 cases. For these eight cases, hygroscopic growth-related
 properties, such as the attenuated backscatter enhancement
 factor fbeta (RH) and the hygroscopic growth coefficient y, are
 evaluated. This study shows that the hygroscopicity parameter y is negatively correlated with the aerosol organic mass
 fraction but shows a positive correlation with the aerosol inorganic
 mass fraction. Among inorganic species, nitrate exhibited
 the highest correlation.
 This is the first time that hygroscopic enhancement factors
 are directly retrieved under ambient aerosols using remotesensing
 techniques, which are combined with online chemical
 composition in situ measurements to evaluate the role of
 the different aerosol species in aerosol hygroscopicity.},
organization = {This work was supported by the Andalusia
Regional Government through project P12-RNM-2409; the Spanish
Ministry of Economy and Competitiveness through projects
CGL2013-45410-R, CGL2016-81092-R, and CGL2017-83538-C3-
1-R; the Excellence network CGL2017-90884-REDT; the Juan de
la Cierva grant IJCI-2016-29838; and the University of Granada
trough the Plan Propio Program P9 Call-2013 contract and project
UCE-PP2017. Andrés Esteban Bedoya-Velásquez has been supported
by a grant for PhD studies in Colombia, COLCIENCIAS
(Doctorado Nacional – 647), associated with the Physics Sciences
program at the Universidad Nacional de Colombia, Sede
Medellín, and the Asociación Universitaria Iberoamericana de
Postgrado (AUIP). Financial support for EARLINET was provided
through ACTRIS-2 Research Infrastructure Project EU
H2O20 (grant agreement no. 654109), particularly for staying 2
weeks at SIRTA observatory and developing this investigation
(TNA 3 SIR AHEAAARS). The authors gratefully acknowledge
the FEDER program for the instrumentation used in this work.
Juan Antonio Bravo-Aranda has received funding from the Marie
Sklodowska-Curie Action Cofund 2016 EU project – Athenea3i under
grant agreement no. 754446.},
publisher = {European Geosciences Union},
title = {Long-term aerosol optical hygroscopicity study at the ACTRIS SIRTA observatory: synergy between ceilometer and in situ measurements},
doi = {10.5194/acp-19-7883-2019},
author = {Bedoya-Velásquez, Andrés Esteban and Titos Vela, Gloria and Bravo Aranda, Juan Antonio and Casquero Vera, Juan Andrés and Olmo Reyes, Francisco José and Alados Arboledas, Lucas and Guerrero Rascado, Juan Luis},
}