Automatic sequential rain sampling to study atmospheric particulate and dissolved wet deposition

Audoux, Thomas; Bouchet, L.; Chevaillier, Servanne; Féron, Anaïs; Pangui, Edouard; Maisonneuve, Franck; Desboeufs, Karine; Triquet, Sylvain; Noyalet, Gael; Lauret, Olivier; Huet, F.

doi:10.1016/j.atmosenv.2022.119561

Cited by 5 publications

(8 citation statements)

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“…1a). Sampling, conditioning and analysis of rain samples are described in detail in Audoux et al (2023); thus, it is only briefly reminded here. The rain is collected using a Teflon pyramid funnel with a collection surface of 1 m 2 in combination with a sampling unit.…”

Section: Measurement Site and Sampling Strategy Of Wet Deposition And...mentioning

confidence: 99%

“…The sampling is conducted based on volume, and as a result, it is dependent on the rainfall rate. The sequential sampler is able to correctly collect rainfall fractions for low rainfall intensities, as well as for more intense rainfall recorded by the rain gauge and disdrometer, in comparison to standardized measurements (Audoux et al, 2023). The materials that make up the sampler have been chosen to allow for analysis of the ionic and elemental composition of the dissolved and particulate phase at high and low concentration levels (from several milligrams per litre (mg L −1 ) to hundreds of nanograms per litre (ng L −1 )).…”

Section: Measurement Site and Sampling Strategy Of Wet Deposition And...mentioning

confidence: 99%

“…Indeed, BCS was considered to be less important than ICS regarding wet deposition in several modelling studies (Croft et al, 2010;Yang et al, 2015;Kim et al, 2021). However, recent observation studies have found that BCS could represent a significant fraction of the wet deposition (Xu et al, 2019;Ge et al, 2021a;Chatterjee et al, 2010;Karşı et al, 2018;Audoux et al, 2023). Grythe et al (2017) also emphasized the significance of BCS, indicating that it is more responsible for the removal of aerosols in the lower atmosphere, while ICS dominates the wet removal in the free troposphere.…”

Section: Introductionmentioning

confidence: 99%

“…Laquer, 1990). It is of particular interest to study the dependence of wet deposition content on rainfall characteristics (intensity, droplet size and distribution), which also evolve during the event (Audoux et al, 2023). In addition, the study of the chemical composition of wet deposition and its evolution throughout a rain event allows for determining the influences of several aerosol sources (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The intra-event evolution of rain chemical composition has also been used to discuss the relative contribution of ICS and BCS mechanisms to wet deposition (e.g. Aikawa and Hiraki, 2009;Ge et al, 2021a;Audoux et al, 2023). Indeed, it is generally assumed that the first increments of the rain event are influenced by both mechanisms, while the last fractions could be attributed to ICS only (Aikawa and Hiraki, 2009;Chatterjee et al, 2010;Germer et al, 2007;Karşı et al, 2018;Desboeufs et al, 2010), although the relative proportion of ICS and BCS evolves during the event (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Intra-event evolution of elemental and ionic concentrations in wet deposition in an urban environment

Audoux,

Laurent,

Desboeufs

et al. 2023

Atmos. Chem. Phys.

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Abstract. A measurement campaign was conducted in the Paris region, focusing on the evolution of chemical composition of wet deposition during rainfall events from sequential sampling. A total of eight rain events were documented and characterized by varying meteorological conditions, atmospheric dynamics, and aerosol particle concentrations representative of urban conditions and influenced by long-range mineral dust transport. The intra-event evolution of the chemical composition of wet deposition revealed the predominant role of meteorological parameters and local sources in the observed mass concentration variability. From selected case studies, the washout ratios (WRs) and scavenging coefficients were quantified by conducting simultaneous measurements of aerosol particle composition and wet deposition. The results highlighted a variability of the WR and scavenging coefficients depending on the rainfall rate and on the chemical species. Scavenging coefficients estimated from WR ranged from 5.4×10-8 to 1.1×10-5 s−1 for chemical elements, and they are within the range of values reported in the literature for 0.2–2 µm particle diameters. Our results pointed out that the scavenging coefficient increases with rainfall rate according to a power law, as previously shown in the literature, indicating a stronger removal of particles from the atmosphere with greater precipitation intensity. Quantitative analysis of the data allowed us to estimate the relative contributions of in-cloud scavenging (ICS) for selected rain events. The ICS relative contributions ranged on average from 23 % to 62 % depending on the rain events, and they varied according to the chemical species within the same rain event. This highlights the variability and complexity of the wet deposition process and the influence of specific factors on the contribution of ICS, such as aerosol particle size and hygroscopicity. Overall, this study highlights the variability of wet deposition and its chemical composition and the need to consider the specificities of each event to fully understand the underlying mechanisms.

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Section: Measurement Site and Sampling Strategy Of Wet Deposition And...mentioning

confidence: 99%

Section: Measurement Site and Sampling Strategy Of Wet Deposition And...mentioning

confidence: 99%