A three-stage cloud impactor for size-resolved measurement of cloud drop chemistry

Collett, Jeffrey L.; Iovinelli, Ralph J.; Demoz, Belay

doi:10.1016/1352-2310(94)00338-l

Cited by 43 publications

(25 citation statements)

References 22 publications

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“…Stages in the same set of samples were distinguished by numbers, example E-1.1_1, E-1.1_2 and E-1.1_3 respectively represented samples of stage 1, stage 2 and stage 3 from E-1.1. (Collett et al, 1995;Raja et al, 2009;Van Pinxteren et al, 2016), minor ions were found diverse size distribution profiles and this may depend on sampling sites and compound species. The pH of cloud droplets was mainly determined by the combined effect of acidic and acid-neutralizing components.…”

Section: Resultsmentioning

confidence: 99%

Chemical Composition and Bacterial Community in Size-Resolved Cloud Water at the Summit of Mt. Tai, China

Zhu

Chen

Wang

et al. 2018

Aerosol Air Qual. Res.

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A three-stage collector was used to collect size-resolved cloud samples at the summit of Mt. Tai. Subsequently, analyses of pH values, water-soluble ions, and trace metals were performed and bacterial community were conducted using MiSeq amplicon sequencing. The pH values of the samples decreased as droplet sizes decreased. Sulfate (SO 4 2-), nitrate (NO 3 -) and ammonium (NH 4 + ) were the main secondary inorganic ions which their concentration distributed significantly different from size-resolved cloud water. The NH 4 + concentration was higher in smaller droplets. The SO 4 2-and NO 3 -concentrations were higher in larger droplets. The Ca 2+ concentration increased as droplet size increased. Small droplet samples tended to have lower pH value, mainly because of the more acidic (SO 4 2-and NO 3 -) and less acid-neutralizing (NH 4 + and Ca 2+ ) components. The bacterial community in size-resolved cloud samples were firstly recognized and dominated by the genera of Lactococcus (average abundance 34.9%) and Bacillus (average abundance 34.0%). Linear discriminant analysis effect size (LEfSe) revealed differences of the bacterial community in size-resolved cloud water samples, which was probably caused by the bacterial size. Redundancy analysis suggested several minor correlations that the H 2 O 2 , NO 2 -concentrations, and trace metals exert effects on the bacterial community.

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Section: Resultsmentioning

confidence: 99%

Chemical Composition and Bacterial Community in Size-Resolved Cloud Water at the Summit of Mt. Tai, China

Zhu

Chen

Wang

et al. 2018

Aerosol Air Qual. Res.

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“…The inorganic fraction of cloud composition has been studied extensively (Chandler et al, 1988a, b;Collett et al, 1993Collett et al, , 1995Erel et al, 1993;Fuzzi et al, 1992Fuzzi et al, , 1998Hegg and Hobbs, 1986). While data on the organic content are sparse, it is clear that organic content can constitute a significant fraction of the solute mass (Aneja, 1993;Fuzzi and Zappoli, 1996;Novakov and Penner, 1993;Hadi et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Cloud chemistry at the Puy de Dôme: variability and relationships with environmental factors

et al. 2004

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Abstract. The chemical composition of cloud water was investigated during the winter-spring months of 2001 and 2002 at the Puy de Dôme station (1465 m above sea level, 45 • 46 22 N, 2 • 57 43 E) in an effort to characterize clouds in the continental free troposphere. Cloud droplets were sampled with single-stage cloud collectors (cut-off diameter approximately 7 µm) and analyzed for inorganic and organic ions, as well as total dissolved organic carbon. Results show a very large variability in chemical composition and total solute concentration of cloud droplets, ranging from a few mg l −1 to more than 150 mg l −1 . Samplings can be classified in three different categories with respect to their total ionic content and relative chemical composition: background continental (BG, total solute content lower than 18 mg l −1 ), anthropogenic continental (ANT, total solute content from 18 to 50 mg l −1 ), and special events (SpE, total solute content higher than 50 mg l −1 ). The relative chemical composition shows an increase in anthropogenic-derived species (NO We observed a high contribution of solute in cloud water derived from the dissolution of gas phase species in all cloud events. This was evident from large solute fractions of nitrate, ammonium and mono-carboxylic acids in cloud water, relative to their abundance in the aerosol phase. The comparison between droplet and aerosol composition clearly shows the limited ability of organic aerosols to act as cloud condensation nuclei. The strong contribution of gas-phase species limits the establishment of direct relationships between cloud water solute concentration and LWC that are expected from nucleation scavenging.

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“…In tropical latitudes, however, there are few studies examining either the inorganic (Gordon et al 1994;Clark et al 1998) or organic (Sanhueza et al 1992) composition of cloud water. The inorganic components of cloud water have been extensively studied (Falconer and Falconer 1980;Hegg and Hobbs 1981;Collett et al 1995) primarily because some of these species (e.g., sulfate and nitrate) are important in acid deposition (Khwaja et al 1995). In temperate regions with strong anthropogenic influence, SO 4 2− , NO 3 − , H + , and NH 4 + often dominate cloud water composition (Weathers et al 1988;Khwaja et al 1995;Marinoni et al 2004;Collett et al 2002;Brüggemann et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Chemical Composition of Cloud Water in the Puerto Rican Tropical Trade Wind Cumuli

Gioda

Mayol-Bracero

Morales-García

et al. 2008

Water Air Soil Pollut

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As part of the Rain In Cumulus over the Ocean Experiment (RICO) and the Puerto Rico Aerosol and Cloud Study (PRACS), cloud water was collected at East Peak (EP) in Puerto Rico. The main objective of this study was to determine the concentrations of water-soluble species (Cl liquid phase concentrations of all inorganic substances were similar to those found in clouds in other clean maritime environments.

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A three-stage cloud impactor for size-resolved measurement of cloud drop chemistry

Cited by 43 publications

References 22 publications

Chemical Composition and Bacterial Community in Size-Resolved Cloud Water at the Summit of Mt. Tai, China

Chemical Composition and Bacterial Community in Size-Resolved Cloud Water at the Summit of Mt. Tai, China

Cloud chemistry at the Puy de Dôme: variability and relationships with environmental factors

Chemical Composition of Cloud Water in the Puerto Rican Tropical Trade Wind Cumuli

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