Evaluation of ionic pollutants in cloud droplets at a mountain ridge in northern Japan using constrained oblique rotational factor analysis

Ogawa, Norio; Kikuchi, Ryoei; Okamura, Tomoko; Inotsume, Junko; Adzuhata, Tetsuya; Ozeki, Toru; Kajikawa, Masahiro

doi:10.1016/s0169-8095(00)00050-8

Cited by 14 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These processes could influence the distribution and the concentration of pollutants both in the cloud phase and in the aerosol phase, and also influence the microphysical properties of the clouds Lee et al, 2012;Ogawa et al, 2000). For example, for a given supersaturated condition, an increase in the concentration of CCN will lead to the formation of small droplets (Borys et al, 2000;Gultepe and Milbrandt, 2007).…”

Section: Introductionmentioning

confidence: 99%

Chemical composition and droplet size distribution of cloud at the summit of Mount Tai, China

Li¹,

Wang²,

Chen³

et al. 2017

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. The chemical composition of 39 cloud samples and droplet size distributions in 24 cloud events were investigated at the summit of Mt. Tai from July to October 2014. Inorganic ions, organic acids, metals, HCHO, H 2 O 2 , sulfur(IV), organic carbon, and elemental carbon as well as pH and electrical conductivity were analyzed. The acidity of the cloud water significantly decreased from a reported value of pH 3.86 during (Guo et al., 2012 to pH 5.87 in the present study. The concentrations of nitrate and ammonium were both increased since 2007-2008, but the overcompensation of ammonium led to an increase in the mean pH value. The microphysical properties showed that cloud droplets were smaller than 26.0 µm and most were in the range of 6.0-9.0 µm at Mt. Tai. The maximum droplet number concentration (N d ) was associated with a droplet size of 7.0 µm. High liquid water content (LWC) values could facilitate the formation of larger cloud droplets and broadened the droplet size distribution. Cloud droplets exhibited a strong interaction with atmospheric aerosols. Higher PM 2.5 levels resulted in higher concentrations of water-soluble ions and smaller sizes with increased numbers of cloud droplets. The lower pH values were likely to occur at higher PM 2.5 concentrations. Clouds were an important sink for soluble materials in the atmosphere. The dilution effect of cloud water should be considered when estimating concentrations of soluble components in the cloud phase.

show abstract

Section: Introductionmentioning

confidence: 99%

Chemical composition and droplet size distribution of cloud at the summit of Mount Tai, China

Li¹,

Wang²,

Chen³

et al. 2017

Atmos. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Cloud plays a significant role in scavenging aerosols via drop deposition (directly or by coalescence into precipitation) and in creating new particles and trace gases (Herckes et al, 2002). These processes influence the distribution and concentration of pollutants in both the cloud phase and the aerosol phase, and they also influence the microphysical properties of the clouds (Collett Jr et al, 2002;Lee et al, 2012;Ogawa et al, 2000). For example, for a given supersaturated condition, an increase in the concentration of CCN will lead to the formation of small droplets (Borys et al, 2000;Gultepe and Milbrandt, 2007).…”

mentioning

confidence: 99%

Chemical composition and droplet size distribution of cloud at the summit of Mount Tai, China

Li¹,

Wang²,

Chen³

et al. 2017

Preprint

View full text Add to dashboard Cite

Abstract. Chemical composition of 39 cloud samples and droplet size distribution in 24 cloud events were investigated at the summit of Mt. Tai from July to October 2014. Inorganic ions, organic acids, metals, HCHO, H2O2, sulfur(IV), organic carbon, element carbon as well as pH and electrical conductivity were analyzed. The acidity of the cloud water significantly decreased from a reported value of pH 3.86 in 2007&#8211;2008 (Guo et al., 2012) to pH 5.87 in the present study. The concentrations of nitrate and ammonium were both increased since 2007&#8211;2008, but the overcompensation of ammonium led to the increase of the mean pH value. The microphysical properties showed that cloud droplets were smaller than 26.0&#8201;&#956;m and the most were in the range of 6.0&#8211;9.0&#8201;&#956;m. The maximum droplet number concentration (Nd) was associated with droplet sizes of 7.0&#8201;&#956;m. Cloud droplets exhibited a strong interaction with atmospheric aerosols. High PM2.5 level resulted in higher concentrations of water soluble ions and smaller sizes with more numbers of cloud droplets, and further gave rise to relatively high acidity. High degrees of relative humidity facilitated the formation of large cloud droplets and led to high liquid water contents under low PM2.5 level. The cloud droplets to wet deposition acted as an important sink of soluble material in the atmosphere and the dilution effect of the water content should be considered when estimating concentrations of soluble components in the cloud phase.

show abstract

The degree of Cl-loss for the particulate matter (PM) and fog water sampled at the same air mass at the Hachimantai mountain range in northern Japan

Kikuchi

Takada

Hifumi

et al. 2009

Atmospheric Research

View full text Add to dashboard Cite

Evaluation of ionic pollutants in cloud droplets at a mountain ridge in northern Japan using constrained oblique rotational factor analysis

Cited by 14 publications

References 8 publications

Chemical composition and droplet size distribution of cloud at the summit of Mount Tai, China

Chemical composition and droplet size distribution of cloud at the summit of Mount Tai, China

Chemical composition and droplet size distribution of cloud at the summit of Mount Tai, China

The degree of Cl-loss for the particulate matter (PM) and fog water sampled at the same air mass at the Hachimantai mountain range in northern Japan

Contact Info

Product

Resources

About