Characterization of aerosol sources in León (Spain) using Positive Matrix Factorization and weather types

Oduber, Fernanda; Calvo, Ana; Castro, Amaya; Blanco-Alegre, C.; Alves, Célia; Calzolai, Giulia; Nava, S.; Lucarelli, F.; Nunes, Teresa; Barata, Joana F. B.; Fraile, Roberto

doi:10.1016/j.scitotenv.2020.142045

Cited by 24 publications

(8 citation statements)

References 74 publications

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“…The last PMF-resolved factor attributed to a mixture of secondary and marine sources was dominated by Na and Mg, major components of sea salt, as well as S, which is a tracer for secondary aerosols. 49,50 The presence of BC in this marine factor profile can be attributed to emissions from the very active ports of Los Angeles and Long Beach. 51 We also observed a moderate amount of Ca and K, constituents of seawater.…”

Section: Op Source Apportionment 331 Op V Oh Factor Identificationmentioning

confidence: 98%

Aerosol Oxidative Potential in the Greater Los Angeles Area: Source Apportionment and Associations with Socioeconomic Position

Shen

Taghvaee

et al. 2022

Environ. Sci. Technol.

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Oxidative potential (OP) has been proposed as a possible integrated metric for particles smaller than 2.5 μm in diameter (PM2.5) to evaluate adverse health outcomes associated with particulate air pollution exposure. Here, we investigate how OP depends on sources and chemical composition and how OP varies by land use type and neighborhood socioeconomic position in the Los Angeles area. We measured OH formation (OPOH), dithiothreitol loss (OPDTT), black carbon, and 52 metals and elements for 54 total PM2.5 samples collected in September 2019 and February 2020. The Positive Matrix Factorization source apportionment model identified four sources contributing to volume-normalized OPOH: vehicular exhaust, brake and tire wear, soil and road dust, and mixed secondary and marine. Exhaust emissions contributed 42% of OPOH, followed by 21% from brake and tire wear. Similar results were observed for the OPDTT source apportionment. Furthermore, by linking measured PM2.5 and OP with census tract level socioeconomic and health outcome data provided by CalEnviroScreen, we found that the most disadvantaged neighborhoods were exposed to both the most toxic particles and the highest particle concentrations. OPOH exhibited the largest inverse social gradients, followed by OPDTT and PM2.5 mass. Finally, OPOH was the metric most strongly correlated with adverse health outcome indicators.

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Section: Op Source Apportionment 331 Op V Oh Factor Identificationmentioning

confidence: 98%

Aerosol Oxidative Potential in the Greater Los Angeles Area: Source Apportionment and Associations with Socioeconomic Position

Shen

Taghvaee

et al. 2022

Environ. Sci. Technol.

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“…The negative spectra of OCEC particles featured strong sulfate signals at 97 HSO 4 − and weak nitrate signals at 46 NO 2 − and 62 NO 3 − . OCEC particles mainly arise from the combustion source ( Bi et al, 2011 ; Oduber et al, 2021 ). The temporal variation of OCEC particles showed good correlations (r 2 = 0.50) with high-K-EC particles ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Ambient particle characteristics by single particle aerosol mass spectrometry at a coastal site in Hong Kong: a case study affected by the sea-land breeze

Wang

Zhang

et al. 2022

PeerJ

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The sea-land breeze (SLB) circulation plays a vital role in the transport of atmospheric pollutants in coastal cities. In this study, a single particle aerosol mass spectrometer (SPAMS) and combined bulk aerosol instruments were deployed to investigate the ambient particle characteristic at a suburban coastal site in Hong Kong from February 22 to March 10, 2013. Significant SLB circulations were captured from March 6–10, 2013, during the campaign. During the SLB periods, air quality worsened, with PM2.5 concentrations reaching a peak of 55.6 μg m−3 and an average value of 42.8 ± 4.5 μg m−3. A total of 235,894 particles were measured during the SLB stage. Eight major sources were identified by investigating the mixing states of the total particles, including the coal-burning related particles (48.1%), biomass burning particles (6.7%), vehicle emission-related particles (16.4%), sea salt (9.2%), ship emission particles (2.7%), dust/steeling industries (3.7%), waste incineration (6.3%), and road dust (3.9%). It was noteworthy that the PM2.5 concentrations and particle numbers increased sharply during the transition of land wind to the sea breeze. Meanwhile, the continental sourced pollutants recirculated back to land resulting in a cumulative increase in pollutants. Both individual and bulk measurements support the above results, with high contributions from coal burning, biomass burning, bulk K+, and NO3−, which were probably from the regional transportation from the nearby area. In contrast, the ship and vehicle emissions increased during the SLB period, with a high sulfate concentration partially originating from the ship emission. In this study, field evidence of continental-source pollutants backflow to land with the evolution of sea breeze was observed and helped our current understanding of the effect of SLB on air quality in the coastal city.

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“…In addition, information on source tracers is required for manual source identification. For example, the crustal elements including Al, Si, Ca, and Fe are markers for dust particles (Amato et al., 2009; Huang et al., 2014); Na + , K + , and Cl − are tracers to identify marine aerosol (Oduber et al., 2021). The present source profiles resolved from the PMF model are shown in Figure and detailed in Text S2.…”

Section: Methodsmentioning

confidence: 99%

Ice‐Nucleating Particle Concentrations and Sources in Rainwater Over the Third Pole, Tibetan Plateau

Chen

et al. 2021

JGR Atmospheres

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The ice‐nucleating particles (INPs) modulate the microphysics and radiative properties of clouds. However, less is known concerning their abundance and sources in the most pristine and climatic sensitive regions, such as the Tibetan Plateau (TP). Here, to our best knowledge, we conduct the first investigation on INPs in rainwater collected in the TP region under mixed‐phase cloud conditions. The value of INP concentrations varies from 0.002 to 0.675 L−1 air over the temperature range from −7.1 to −27.5°C. This is within the INP spectra derived from precipitation under worldwide geophysical conditions and is also comparable with INP concentrations in the Arctic regions. The heat‐sensitive INPs account for 57% ± 30% of the observed INPs at −20°C and become increasingly important at higher temperatures, indicating biological particles as major contributors to INPs at temperatures above −20°C over the TP, especially on the day with additional input of biogenic materials carried by dust particles. Chemical analysis demonstrates that the rainwater components are mixture of dust particles, marine aerosol, and anthropogenic pollutants. Combined with the backward trajectory analysis, we show that dust particles transported from the surrounding deserts and originated from ground surface of TP may contribute to the heat‐resistant INPs at temperatures below −20°C.

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Characterization of aerosol sources in León (Spain) using Positive Matrix Factorization and weather types

Cited by 24 publications

References 74 publications

Aerosol Oxidative Potential in the Greater Los Angeles Area: Source Apportionment and Associations with Socioeconomic Position

Aerosol Oxidative Potential in the Greater Los Angeles Area: Source Apportionment and Associations with Socioeconomic Position

Ambient particle characteristics by single particle aerosol mass spectrometry at a coastal site in Hong Kong: a case study affected by the sea-land breeze

Ice‐Nucleating Particle Concentrations and Sources in Rainwater Over the Third Pole, Tibetan Plateau

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