Spatial and temporal (short and long-term) variability of submicron, fine and sub-10 μm particulate matter (PM1, PM2.5, PM10) in Cyprus

Pikridas, Michael; Vrekoussis, Mihalis; Sciare, Jean; Kleanthous, Savvas; Vasiliadou, Emily; Kizas, Christos; Savvides, Chrysanthos; Mihalopoulos, Nikolaos

doi:10.1016/j.atmosenv.2018.07.048

Cited by 77 publications

(43 citation statements)

References 81 publications

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“…Here, k 0 represents the coefficient of H 2 SO 4 production term due to the well-known SO 2 -OH reaction (Petäjä et al, 2009) and k 2 is the coefficient of H 2 SO 4 production via stabilized Criegee intermediates (sCI) produced by the ozonolysis of alkenes (Mauldin et al, 2012). We use available monoterpene concentration (MT) here as a proxy for alkenes in Hyytiälä as they are the dominating species in the boreal forest environment (Hakola et al, 2012;Hellén et al, 2018;Rinne et al, 2005). For Beijing, we use urban-dominating aromatic alkenes.…”

Section: Derivation Of the New Proxymentioning

confidence: 99%

Sources and sinks driving sulfuric acid concentrations in contrasting environments: implications on proxy calculations

et al. 2020

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Abstract. Sulfuric acid has been shown to be a key driver for new particle formation and subsequent growth in various environments, mainly due to its low volatility. However, direct measurements of gas-phase sulfuric acid are oftentimes not available, and the current sulfuric acid proxies cannot predict, for example, its nighttime concentrations or result in significant discrepancies with measured values. Here, we define the sources and sinks of sulfuric acid in different environments and derive a new physical proxy for sulfuric acid to be utilized in locations and during periods when it is not measured. We used H2SO4 measurements from four different locations: Hyytiälä, Finland; Agia Marina, Cyprus; Budapest, Hungary; and Beijing, China, representing semi-pristine boreal forest, rural environment in the Mediterranean area, urban environment and heavily polluted megacity, respectively. The new proxy takes into account the formation of sulfuric acid from SO2 via OH oxidation and other oxidation pathways, specifically via stabilized Criegee intermediates. The sulfuric acid sinks included in the proxy are its condensation sink (CS) and atmospheric clustering starting from H2SO4 dimer formation. Indeed, we found that the observed sulfuric acid concentration can be explained by the proposed sources and sinks with similar coefficients in the four contrasting environments where we have tested it. Thus, the new proxy is a more flexible and an important improvement over previous proxies. Following the recommendations in this paper, a proxy for a specific location can be derived.

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Section: Derivation Of the New Proxymentioning

confidence: 99%

Sources and sinks driving sulfuric acid concentrations in contrasting environments: implications on proxy calculations

et al. 2020

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“…2.2.2 and 2.2.3 for the instruments used in this study. The equivalent black carbon (eBC) mass concentration (expressed in µg m −3 ) can be calculated based on 880 nm wavelength b atn (λ) (Ramachandran and Rajesh, 2007), using either Eq. (4) or (5),…”

Section: Principle Of Operationmentioning

confidence: 99%

On-flight intercomparison of three miniature aerosol absorption sensors using unmanned aerial systems (UASs)

Pikridas

Bezantakos

Močnik³

et al. 2019

Atmos. Meas. Tech.

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Abstract. The present study investigates and compares the ground and in-flight performance of three miniaturized aerosol absorption sensors integrated on board small-sized Unmanned Aerial Systems (UASs). These sensors were evaluated during two contrasted field campaigns performed at an urban site, impacted mainly by local traffic and domestic wood burning sources (Athens, Greece), and at a remote regional background site, impacted by long-range transported sources including dust (Cyprus Atmospheric Observatory, Agia Marina Xyliatou, Cyprus). The miniaturized sensors were first intercompared at the ground-level against two commercially available instruments used as a reference. The measured signal of the miniaturized sensors was converted into the absorption coefficient and equivalent black carbon concentration (eBC). When applicable, signal saturation corrections were applied, following the suggestions of the manufacturers. The aerosol absorption sensors exhibited similar behavior against the reference instruments during the two campaigns, despite the diversity of the aerosol origin, chemical composition, sources, and concentration levels. The deviation from the reference during both campaigns concerning (eBC) mass was less than 8 %, while for the absorption coefficient it was at least 15 %. This indicates that those sensors that report black carbon mass are tuned and corrected to measure eBC more accurately than the absorption coefficient. The overall potential use of miniature aerosol absorption sensors on board small UASs is also illustrated. UAS-based absorption measurements were used to investigate the vertical distribution of eBC over Athens up to 1 km above sea level during January 2016, exceeding the top of the planetary boundary layer (PBL). Our results reveal a heterogeneous boundary layer concentration of absorbing aerosol within the PBL intensified in the early morning hours due to the concurrent peak traffic emissions at ground-level and the fast development of the boundary layer. After the full development of the PBL, homogenous concentrations are observed from 100 m a.g.l. to the PBL top.

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“…), a rural background site located close to Agia Marina Xyliatou village, between February 22 and March 3, 2018. For more details, see for example Pikridas et al (2018).…”

Section: Measurement Locations Observations and Instrumentationmentioning

confidence: 99%

Sources and sinks driving sulphuric acid concentrations in contrasting environments: implications on proxy calculations

Dada¹,

Ylivinkka²,

Baalbaki³

et al. 2020

Preprint

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Abstract. Sulphuric acid has been shown to be a key driver for new particle formation and subsequent growth in various environments mainly due to its low volatility. However, direct measurements of gas-phase sulphuric acid are oftentimes not available, and the current sulphuric acid proxies cannot predict for example its nighttime concentrations or result in significant discrepancies with measured values. Here, we define the sources and sinks of sulphuric acid in different environments and derive a new physical proxy for sulphuric acid to be utilized in locations and during periods when it is not measured. We used H2SO4 measurements from four different locations: Hyytiälä, Finland; Agia Marina, Cyprus; Budapest, Hungary; and Beijing, China, representing semi-pristine boreal forest, rural environment in the Mediterranean area, urban environment and heavily polluted megacity, respectively. The new proxy takes into account the formation of sulphuric acid from SO2 via OH oxidation and other oxidation pathways, specifically that via stabilized Criegee Intermediates. The sulphuric acid sinks included in the proxy are its condensation sink (CS) and atmospheric clustering starting from H2SO4 dimer formation. Indeed, we found that the observed sulphuric acid concentration can be explained by the proposed sources and sinks with similar coefficients in the four contrasting environments where we have tested it. Thus, the new proxy is a more flexible and an important improvement of previous proxies. Following the recommendations in the manuscript, a proxy for a specific location can be derived.

show abstract

Spatial and temporal (short and long-term) variability of submicron, fine and sub-10 μm particulate matter (PM1, PM2.5, PM10) in Cyprus

Cited by 77 publications

References 81 publications

Sources and sinks driving sulfuric acid concentrations in contrasting environments: implications on proxy calculations

Sources and sinks driving sulfuric acid concentrations in contrasting environments: implications on proxy calculations

On-flight intercomparison of three miniature aerosol absorption sensors using unmanned aerial systems (UASs)

Sources and sinks driving sulphuric acid concentrations in contrasting environments: implications on proxy calculations

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Spatial and temporal (short and long-term) variability of submicron, fine and sub-10 μm particulate matter (PM1, PM2.5, PM10) in Cyprus

Cited by 77 publications

References 81 publications

Sources and sinks driving sulfuric acid concentrations in contrasting environments: implications on proxy calculations

Sources and sinks driving sulfuric acid concentrations in contrasting environments: implications on proxy calculations

On-flight intercomparison of three miniature aerosol absorption sensors using unmanned aerial systems (UASs)

Sources and sinks driving sulphuric acid concentrations in contrasting environments: implications on proxy calculations

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Spatial and temporal (short and long-term) variability of submicron, fine and sub-10 μm particulate matter (PM1, PM2.5, PM10) in Cyprus