Temporal variation of 212Pb concentration in outdoor air of Milan and a comparison with 214Bi

Marcazzan, G.; Caprioli, E; Valli, G.; Vecchi, R.

doi:10.1016/s0265-931x(02)00089-9

Cited by 22 publications

(29 citation statements)

References 27 publications

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“…However, there have been very few studies on 220 Rn (thoron), yet it is an interesting subject in its own right, because it has somewhat different characteristics. A very recent study was www.elsevier.com/locate/jenvrad by Marcazzan et al (2003), who emphasized the variation within a day; our study complements their work rather well. Normal radon (i.e.…”

Section: Introductionsupporting

confidence: 70%

“…(They claimed that above 15 (C, the activity and temperature were negatively correlated; we shall come back to this questionable result later.) Marcazzan et al (2003) also used adetection, explicitly explaining that they detected the high-energy a from 212 Po decay, but showed that it is highly correlated to 212 Pb concentration. They presented hourly activities for a whole year (calendar, 2000), and their data showed a strong diurnal variation for both 212 Pb and 214 Bi ( from 222 Rn); variations of 5:1 (night/day) were common and even 10:1 was observed.…”

Section: Introductionmentioning

confidence: 99%

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A simple model for describing the concentration of 212Pb in the atmosphere

Measday

2005

Journal of Environmental Radioactivity

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Section: Introductionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

A simple model for describing the concentration of 212Pb in the atmosphere

Measday

2005

Journal of Environmental Radioactivity

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“…Following Schmidt et al (1996), 222 Rn and its decay products were considered in secular radioactive equilibrium in this work. Further details on the experimental procedure are reported in Marcazzan et al (2003) and Sesana et al (2003).…”

Section: Soil Chambersmentioning

confidence: 99%

Canopy uptake dominates nighttime carbonyl sulfide fluxes in a boreal forest

et al. 2017

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Abstract. Nighttime vegetative uptake of carbonyl sulfide (COS) can exist due to the incomplete closure of stomata and the light independence of the enzyme carbonic anhydrase, which complicates the use of COS as a tracer for gross primary productivity (GPP). In this study we derived nighttime COS fluxes in a boreal forest (the SMEAR II station in Hyytiälä, Finland; 61 • 51 N, 24 • 17 E; 181 m a.s.l.) from June to November 2015 using two different methods: eddycovariance (EC) measurements (F COS-EC ) and the radontracer method (F COS-Rn ). The total nighttime COS fluxes averaged over the whole measurement period were −6.8 ± 2.2 and −7.9 ± 3.8 pmol m −2 s −1 for F COS-Rn and F COS-EC , respectively, which is 33-38 % of the average daytime fluxes and 21 % of the total daily COS uptake. The correlation of 222 Rn (of which the source is the soil) with COS (average R 2 = 0.58) was lower than with CO 2 (0.70), suggesting that the main sink of COS is not located at the ground. These observations are supported by soil chamber measurements that show that soil contributes to only 34-40 % of the total nighttime COS uptake. We found a decrease in COS uptake with decreasing nighttime stomatal conductance and increasing vapor-pressure deficit and air temperature, driven by stomatal closure in response to a warm and dry period in August. We also discuss the effect that canopy layer mixing can have on the radon-tracer method and the sensitivity of (F COS-EC ) to atmospheric turbulence. Our results suggest that the nighttime uptake of COS is mainly driven by the tree foliage and is significant in a boreal forest, such that it needs to be taken into account when using COS as a tracer for GPP.

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“…To evaluate atmospheric dispersion conditions, 222 Rn short-lived decay products measurements were performed using the experimental methodology reported in Marcazzan et al (2003). Mixing layer heights (MLHs) with hourly resolution were obtained by means of a box model suitably set up by the group of the Institute of Physics using 222 Rn concentration measurements as input data (Pacifico, 2005).…”

Section: Additional Measurementsmentioning

confidence: 99%

The impact of fireworks on airborne particles

Vecchi

Bernardoni

Cricchio

et al. 2008

Atmospheric Environment

221

139

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Fireworks are one of the most unusual sources of pollution in atmosphere; although transient, these pollution episodes are responsible for high concentrations of particles (especially metals and organic compounds) and gases. In this paper, results of a study on chemical-physical properties of airborne particles (elements, ions, organic and elemental carbon and particles size distributions) collected during a fireworks episode in Milan (Italy) are reported. Elements typically emitted during pyrotechnic displays increased in 1 h as follows: Sr (120 times), Mg (22 times), Ba (12 times), K (11 times), and Cu (6 times). In our case study, Sr was recognised as the best fireworks tracer because its concentration was very high during the event and lower than, or comparable with, minimum detection limits during other time intervals, suggesting that it was mainly due to pyrotechnic displays. In addition, particles number concentrations increased significantly during the episode (up to 6.7 times in 1 h for the 0.5odo1 mm size bin). Contributions (e.g. Cu, elemental carbon and nitrogen oxides) to air pollution due to the large traffic volume registered during the same night were also singled out.The original application of Positive Matrix Factorisation and Multiple Linear Regression allowed, as far as we know, here for the first time, the quantification of the fireworks contribution to atmospheric particulate matter (PM) and the resolution of their chemical profile. The contribution of fireworks to the local environment in terms of PM 10 mass, elements and chemical components was assessed with 4-h time resolution. PM 10 mass apportioned by fireworks was up to 33.6 mg m À3 (about 50% of the total PM 10 mass). Major contributors were elemental and organic carbon (2.8 and 8.1 mg m À3, respectively) as well as metals like Mg, K, Sr, Ba, and Cu (0.4, 0.7, 0.07, 0.1, and 0.1 mg m À3 , respectively).

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Temporal variation of 212Pb concentration in outdoor air of Milan and a comparison with 214Bi

Cited by 22 publications

References 27 publications

A simple model for describing the concentration of 212Pb in the atmosphere

A simple model for describing the concentration of 212Pb in the atmosphere

Canopy uptake dominates nighttime carbonyl sulfide fluxes in a boreal forest

The impact of fireworks on airborne particles

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