Diurnal source apportionment of organic and inorganic atmospheric particulate matter at a high-altitude mountain site under summer conditions (Sierra Nevada; Spain) Jaén, Clara Titos Vela, Gloria Castillo Fernández, Sonia Casans Gabasa, Andrea Rejano Martínez, Fernando Cazorla Cabrera, Alberto Herrero, Javier Alados Arboledas, Lucas Air pollution High-mountain Particulate matter Organic PM Inorganic PM Source apportionment This work was supported by the CuanTox (CTM2015-71832-P), Intempol (PGC2018-102288-B-I00) and BioCloud project (RTI2018.101154.A.I00) funded by MCIN/AEI/10.13039/501100011033 and FEDER "ERDF a way of making Europe" and NUCLEUS project (PID2021-128757OB-I00) funded by MCIN/AEI/10.13039/501100011033 and the "European Union NextGenerationEU/PRTR". The study was partially funded by the European Union's Horizon 2020 research and innovation program through project ACTRIS.IMP (grant agreement No 871115) and ATMO_ACCESS (grant agreement No 101008004), by the Spanish Ministry of Science and Innovation through projects ELPIS (PID2020-120015RB-I00), and ACTRIS-Espana (RED2022-134824-E), by the Junta de Andalucia Excellence project ADAPNE (P20-00136) and AEROPRE (P-18-RT -3820). This research was partially supported by University of Granada Plan Propio through Singular Laboratory AGORA (LS2022-1) and Scientific Units of Excellence Program (grant no. UCE-PP2017-02). IDAEA-CSIC is a Severo Ochoa Centre of Research Excellence (Spanish Ministry of Science and Innovation, CEX2018-000794-S). Funding from Generalitat de Catalunya, Research Group 2021SGR00986, is acknowledged. C.J. thanks the financial support from a Training of University Teachers (FPU 19/06826) grant from the Ministry of Science and Innovation (Spain). High-altitude mountain areas are sentinel ecosystems for global environmental changes such as anthropogenic pollution. In this study, we report a source apportionment of particulate material with an aerodynamic diameter smaller than 10 μm (PM10) in a high-altitude site in southern Europe (Sierra Nevada Station; SNS (2500 m a.s.l.)) during summer 2021. The emission sources and atmospheric secondary processes that determine the composition of aerosol particles in Sierra Nevada National Park (Spain) are identified from the concentrations of organic carbon (OC), elemental carbon (EC), 12 major inorganic compounds, 18 trace elements and 44 organic molecular tracer compounds in PM10 filter samples collected during day- and nighttime. The multivariate analysis of the joint dataset resolved five main PM10 sources: 1) Saharan dust, 2) advection from the urbanized valley, 3) local combustion, 4) smoke from a fire-event, and 5) aerosol from regional recirculation with high contribution of particles from secondary inorganic and organic aerosol formation processes. PM sources were clearly associated with synoptic meteorological conditions, and day- and nighttime circulation patterns typical of mountainous areas. Although a local pollution source was identified, the contribution of this source to PM10, OC and EC was small. Our results evidence the strong influence of middle- and long-range transport of aerosols, mainly from anthropogenic origin, on the aerosol chemical composition at this remote site. 2023-11-23T13:22:32Z 2023-11-23T13:22:32Z 2023-12-20 journal article C. Jaén et al. Diurnal source apportionment of organic and inorganic atmospheric particulate matter at a high-altitude mountain site under summer conditions (Sierra Nevada; Spain). Science of the Total Environment 905 (2023) 167178. [https://doi.org/10.1016/j.scitotenv.2023.167178] https://hdl.handle.net/10481/85834 10.1016/j.scitotenv.2023.167178 eng info:eu-repo/grantAgreement/EC/H2020/871115 http://creativecommons.org/licenses/by-nc/4.0/ open access Atribución-NoComercial 4.0 Internacional Elsevier