@misc{10481/98702,
year = {2021},
url = {https://hdl.handle.net/10481/98702},
abstract = {Understanding the activation properties of aerosol particles as cloud condensation nuclei (CCN) is important for
the climate and hydrological cycle, but their properties are not fully understood. In this study, the CCN activation
properties of aerosols are investigated at two different sites in southern Spain: an urban background station in
Granada and a high altitude mountain station in the Sierra Nevada National Park, with a horizontal separation
of 21 km and vertical separation of 1820 m.
CCN activity at the urban environment is driven by primary sources, mainly road traffic.Maximum CCN concentrations
occurred during traffic rush hours, although this is alsowhen the activation fraction is lowest. This is due
to the characteristics of the rush hour aerosol consisting of ultrafine and less hygroscopic particles. In contrast, the
mountain site exhibited larger and more hygroscopic particles,with CCN activity driven by the joint effect of new
particle formation (NPF) and vertical transport of anthropogenic particles from Granada urban area by orographic
buoyant upward flow. This led to the maximum concentrations of CCN and aerosol particles occurring
at midday at the mountain site. Clear differences in the diurnal evolution of CCN between NPF events and nonevent
days were observed at the Sierra Nevada station, demonstrating the large contribution of NPF to CCN concentrations,
especially at high supersaturations. The isolated contribution of NPF to CCN concentration has been
estimated to be 175% higher at SS=0.5% relative to what it would be without NPF.We conclude that NPF could
be the major source of CCN at this mountain site.},
organization = {Spanish Ministry of Science and Innovation through projects CGL2016-81092-R, CGL2017-90884REDT and
RTI2018.101154.A.I00, by Junta de Andalucía, UGR and FEDER funds through project B-RNM-474-UGR18 and B-RNM-496-UGR18, by the Junta de Andalucía Excellence project P-18-RT-3820 and by University of Granada Plan Propio through Visiting Scholars program},
organization = {Gloria Titos is funded by Spanish Ministry of Science and Innovation under postdoctoral program Juan de la Cierva (IJCI-2016-29838)},
organization = {Juan Andrés Casquero-Vera is funded by MINECO under the predoctoral program FPI (BES-2017-080015).},
publisher = {Elsevier},
keywords = {Cloud condensation nuclei},
keywords = {New particle formation},
keywords = {High-altitude remote site empirical model},
title = {Activation properties of aerosol particles as cloud condensation nuclei at urban and high-altitude remote sites in southern Europe},
doi = {https://doi.org/10.1016/j.scitotenv.2020.143100},
author = {Rejano Martínez, Fernando and Titos Vela, Gloria and Casquero Vera, Juan Andrés and Lyamani, Hassan and Andrews, Elisabeth and Sheridan, P. and Cazorla Cabrera, Alberto and Castillo, Sonia and Alados Arboledas, Lucas and Olmo Reyes, Francisco José},
}