2018
DOI: 10.5194/acp-2018-960
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Transport of Po Valley aerosol pollution to the northwestern Alps. Part 1: phenomenology

Abstract: Abstract. Mountainous regions are often considered pristine environments, however they can be affected by pollutants emitted in more populated and industrialised areas, transported by regional winds. Based on experimental evidence, further supported by modelling tools, we demonstrate and quantify here the impact of air masses transported from the Po Valley, a European atmospheric pollution hotspot, to the northwestern Alps. This is achieved through a detailed investigation of the phenomenology of near-range (f… Show more

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Cited by 5 publications
(6 citation statements)
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“…When coupled with mesoscale aerosol modeling, observations of vertical atmospheric profiles of aerosols, cloud, and wind by remote-sensing instrumentation located in valley bottoms can provide a powerful means by which the transport of aerosol pollution to high-mountain regions can be characterized. 77 Taking measurements along vertical transects, which can also provide information about the vertical variability of radiative fluxes and aerosol deposition, represents an alternative, complementary approach.…”
Section: Measuring Emcvsmentioning
confidence: 99%
“…When coupled with mesoscale aerosol modeling, observations of vertical atmospheric profiles of aerosols, cloud, and wind by remote-sensing instrumentation located in valley bottoms can provide a powerful means by which the transport of aerosol pollution to high-mountain regions can be characterized. 77 Taking measurements along vertical transects, which can also provide information about the vertical variability of radiative fluxes and aerosol deposition, represents an alternative, complementary approach.…”
Section: Measuring Emcvsmentioning
confidence: 99%
“…These two sites have higher dispersion (FWHM = 0.03), and approximately 30 % of the data are included in the interval −0.01-0.01 for the red and blue histograms at both sites, which is probably due to the different aerosol load affecting the different ALICEnet stations. As pointed out by the low value of the average AOT computed at ASC for the analyzed dataset ( AOT = 0.027), low pollution levels generally characterize this site, with some exceptions due to wind-driven aerosol transport from the nearby Po Valley (Diémoz et al, 2014(Diémoz et al, , 2018a. Conversely, RTV ( AOT = 0.044) and especially SPC in the Po Valley ( AOT = 0.076) are characterized by higher aerosol content and pollution levels, which explain the larger histogram dispersions.…”
Section: Model-based Retrieval Of Aerosol Optical Propertiesmentioning
confidence: 82%
“…Starting from 18:00 UTC, the ALC derives an aerosol volume concentration higher than the OPC concentration by a factor of 3-3.5. This disagreement could be related to both the presence/arrival of fine particles (< 0.3 m) not measured by the optical counter (see for example Diémoz et al, 2018a), or to aerosol hygroscopic effects (increase in volume associated with hygroscopic growth seen by the ALC but not by the OPC that dries the air samples). This latter effect is confirmed by the large RH values (RH > 90 %) measured after 18:00 UTC.…”
Section: Model-based Retrieval Of Aerosol Volume (And Mass)mentioning
confidence: 99%
“…Several studies show the importance of the pollution transport from this area to the surrounding regions (e.g. Diémoz et al, 2019aDiémoz et al, , 2019b and the complexity of chemical and dynamical processes within the Po Valley mixing layer (e.g. Curci et al, 2015).…”
Section: Mpc Po Valley and Romementioning
confidence: 99%