Coarse and accumulation mode particles associated with Asian dust in southwestern Japan

Zhang, Daizhou; Iwasaka, Yasunobu; Matsuki, Atsushi; Ueno, Kazunori; Matsuzaki, Tatsuya

doi:10.1016/j.atmosenv.2005.10.037

Cited by 53 publications

(33 citation statements)

References 27 publications

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“…Thus the air at the time of D1-D5 collection was typically postfrontal air (weather charts omitted). Similar postfrontal air has been frequently observed at the AERU areas in previous studies (e.g., Zhang et al, 2006).…”

Section: Correspondence To Aerosol Constitutions Under Relatively Drysupporting

confidence: 59%

Dependence of Backscattering Coefficients of Atmospheric Particles on their Concentration and Constitution under Dry and Humid Conditions at Southwestern Japanese Coast in Spring

Fukushima

Zhang

Shibata

et al. 2016

Aerosol Air Qual. Res.

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The dependence of atmospheric particles' backscattering coefficients (BSCs) on their concentration and constitution in the near surface air at southwestern Japanese coast in the spring of 2011-2015 was investigated. The BSCs were measured with a ceilometer at the wavelength 905 ± 5 nm. The size-segregated concentrations of particles larger than 0.3 µm were measured with optical particle counters. The constitution of particles in each of eight episodes, i.e., the portions of mineral dust, sea salt, sulfate and soot particles, was obtained with individual particle analysis by using an electron microscope. There was a close correlation (R 2 = 0.76) between the BSCs and the volume concentrations of the particles when the relative humidity (RH) was lower than ~70%, regardless of the difference in particle constitutions. In contrast, the BSCs normalized with aerosol concentrations differed largely even at similar concentrations of particles when the RH was larger than 70%. The BSCs of particles dominated by marine origin (sea salt) could be several times larger than those dominated by land origin (dust and soot) at 90% RH, as the latter might be slightly larger than the BSCs under the dry conditions. On the other hand, the difference of volume-size distributions of particles likely also made the BSCs largely different from each other under the humid conditions. These results indicate that the concentration of atmospheric particles was the key parameter to determine the BSCs under dry conditions, while the BSCs under humid conditions were closely dependent on the content of deliquescent components and the size distributions of the particles.

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Section: Correspondence To Aerosol Constitutions Under Relatively Drysupporting

confidence: 59%

Dependence of Backscattering Coefficients of Atmospheric Particles on their Concentration and Constitution under Dry and Humid Conditions at Southwestern Japanese Coast in Spring

Fukushima

Zhang

Shibata

et al. 2016

Aerosol Air Qual. Res.

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“…Mineral dust particles over East Asia may be modified and become internally mixed particles through the adsorption of gases or coagulation with other kinds of aerosol particles during their transport. The internally mixed particles of dust and sea salt were often found in the boundary layer over Japan in the spring and its fraction often exceeded 80% of total dust particles (e.g., Zhang et al 2003Zhang et al , 2006Yamashita et al 2005). Although it is possible that the CCN ability of the mineral dust particles changes with such modifications, few studies have addressed this issue.…”

Section: Discussionmentioning

confidence: 98%

CCN Ability of Asian Mineral Dust Particles and Their Effects on Cloud Droplet Formation

Yamashita¹,

Murakami²,

Hashimoto³

et al. 2011

Journal of the Meteorological Society of Japan

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To understand the cloud condensation nuclei (CCN) ability of Asian mineral dust particles, we investigated the activation spectrum (fraction) and the hygroscopicity parameter κ of the certified reference materials for Asian mineral dust (CAD) particles. The CAD particles were dispersed in dry conditions using a rotating brush generator and then measured with a cloud condensation nuclei counter and a condensation particle counter. The concentration ratios of CCN to condensation nuclei (CN) of the CAD particles were 0.7 at supersaturation (SS) = 0.2% and 0.8 at SS = 0.4%. This suggests that Asian mineral dust particles, by themselves, may effectively act as CCN. The mean hygroscopic parameter κ of the CAD particles estimated from the relationship between the measured critical supersaturation and dry diameter was 0.014. Using this κ-value, we simulated the change in the size distribution from CCN to droplets during adiabatic ascent by a parcel model. The simulation suggested that the CAD (low hygroscopicity) particles do not grow large enough to promote collision-coalescence in the early stage of cloud formation. The hygroscopic parameter κ of internally mixed particles of CAD and sea salt was calculated by using the κ-Köhler theory, and their activation and subsequent condensation growth processes during adiabatic ascent were also simulated with the parcel model. The simulation results suggest that the hygroscopicity of Asian mineral dust particles was considerably enhanced, and droplets activated on them grew much larger than those activated on pure mineral dust particles.

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“…Early morning on that day, there was a volcanic eruption on Miyakejima island, which is approximately 200 km southeast of Matsumoto; this eruption that might account for the high Ca 2+ and SO 4 2-concentrations in the precipitation samples (Fujita et al, 2003;Matsuda et al, 2004). On the other hand, a high concentration of Ca 2+ and SO 4 2-was observed in samples containing yellow sand that were transported from winter to spring (Zhang et al, 2006). Table 1 shows the correlation matrix of each ion concentration.…”

Section: Origin Of Each Ion In Precipitationmentioning

confidence: 99%

Seasonal and temporal changes in the fluxes of major inorganic ions via wet and dry depositions, observed in Matsumoto, central Japan

Suzuki

Shirohada

2006

Geochem. J.

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Wet and dry deposits were collected using an automatic fractionation precipitation collector for three and a half years in Matsumoto city, central Japan. Because of the imperfect collection of some inorganic ions, the fraction collected as dry deposit is named "dry dish sample" in this study. The collected samples were analyzed for major cations and anions using ion chromatography. Based on the elemental ratios, Na + , Cl -, and Mg 2+ in the precipitation are considered to be of sea salt origin. However, the Cl -found in the dry dish samples was deficient with respect to Na + , possibly resulting from chlorine loss from aerosols, and the Mg 2+ content of dry dish samples is thought to be derived from the soil. Abnormally high concentrations of Ca 2+ and SO 4 2-were observed in both the precipitation and dry dish samples for a few days after the eruption of Miyakejima volcano. The Na + and Cl -concentrations in precipitation showed high values in winter, and the yellow sand carried from China in the spring affected the concentrations of Ca 2+ and Mg 2+ in the precipitation, as well as those in the dry dish sample. High time-resolution sampling of the precipitation disclosed short variations in its composition, which would have otherwise escaped our attention. When continuous precipitation from stratiform clouds occurred due to a warm front, the concentration of chemical constituents in the precipitation was high in the first fraction of precipitation, but was subsequently markedly reduced. On the other hand, when intermittent precipitation was produced from cumuliform clouds due to a cold front, it became more complex: in such cases, there was no predictable pattern for the subsequent concentration fluctuations, i.e., the concentrations of the chemical constituents fluctuated within a day.

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Coarse and accumulation mode particles associated with Asian dust in southwestern Japan

Cited by 53 publications

References 27 publications

Dependence of Backscattering Coefficients of Atmospheric Particles on their Concentration and Constitution under Dry and Humid Conditions at Southwestern Japanese Coast in Spring

Dependence of Backscattering Coefficients of Atmospheric Particles on their Concentration and Constitution under Dry and Humid Conditions at Southwestern Japanese Coast in Spring

CCN Ability of Asian Mineral Dust Particles and Their Effects on Cloud Droplet Formation

Seasonal and temporal changes in the fluxes of major inorganic ions via wet and dry depositions, observed in Matsumoto, central Japan

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