Changes in ionic constituents of free tropospheric aerosol particles obtained at Mt. Norikura (2770 a.s.l.), central Japan, during the Shurin period in 2000

Osada, Kazuo; Kido, Masaru; Nishita, Chiharu; Matsunaga, Katsuji; Iwasaka, Yasunobu; Nagatani, Masahiro; Nakada, Hiroshi

doi:10.1016/s1352-2310(02)00663-5

Cited by 34 publications

(20 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Table 5 shows the mean ionic concentrations of PM 10 during both AD and NAD periods. Previous studies indicated the concentration of nss-Ca 2+ in PM 10 dramaticlly increased when dust phenomena were observed over Japan (Osada et al 2002;Suzuki et al 2008). Our result also suggested that nss-Ca 2+ in PM 10 was marked high in AD periods.…”

Section: Influence Of the Asian Dust Storm Intrusionsupporting

confidence: 73%

Long-term characterization of major water-soluble inorganic ions in PM10 in coastal site on the Japan Sea

et al. 2011

View full text Add to dashboard Cite

PM 10 samples were collected over three years at Monzenmachi, the Japan Sea coast, the Noto Peninsula, Ishikawa, Japan from January 17, 2001 to December 18, 2003, using a high volume air sampler with quartz filters. The concentrations of the water-soluble inorganic ions in PM 10 were determined with using ion chromatography. By analyzing the characteristics of these, the evidences were found that the Asian outflow had an obviously influence on the air quality at our study site. The results were as follows: the secondary pollutants SO 4 2− , NO 3 − and NH 4 + were the primary water-soluble inorganic ions at our study site. The monthly mean concentrations of SO 4 2− , NH 4 + , NO 3 − and Ca 2+ have prominent peak in spring due to the strong influence of the Asian continent outflow-these according to backward air trajectory analysis, the maximum of which were 6.09 for nss-SO 4 2− in May, 2.87 for NO 3 − and 0.68 μg m −3 for nss-Ca 2+ in April, respectively. Comparable to similar data reported from various points around East Asia, it had the characteristics of a polluted coastal area at our study site. The concentration of nss-Ca 2+ in PM 10 drastically increased when the Asian dust invaded, the mean value during the Asian dust days(AD) was 0.86 μg m −3 , about 4 times higher than those of normal days (NAD). Meanwhile, the mean concentrations of nss-SO 4 2− , NO 3 − and NH 4 + in AD periods were higher than those in NAD periods which were 5.87, 1.76 and 1.82 μg m −3 , respectively, it is due to the interaction between dust and secondary particles during the long-range transport of dust storms. Finally, according to the source apportionment with positive matrix factorization (PMF) method in this study, the major source profiles of PM 10 at our study site were categorized as (1) marine salt, (2) secondary sulfate, (3) secondary nitrate and (4) crustal source.

show abstract

Section: Influence Of the Asian Dust Storm Intrusionsupporting

confidence: 73%

Long-term characterization of major water-soluble inorganic ions in PM10 in coastal site on the Japan Sea

et al. 2011

View full text Add to dashboard Cite

show abstract

“… Akimoto and Narita [1994] and Hatakeyama et al [1995] noticed high concentrations of SO 2 under the outflow of anthropogenic pollutants from the Asian continent. Likewise, Osada et al [2002] suggested high concentrations of sulfate particles in the free troposphere over Japan. Hence to characterize the distributions of aerosol particles and CCN in the east Asia region, vertical observations were performed on clear days over the ocean near the southwest islands of Japan.…”

Section: Resultsmentioning

confidence: 99%

Vertical distribution of cloud condensation nuclei concentrations and their effect on microphysical properties of clouds over the sea near the southwest islands of Japan

et al. 2005

View full text Add to dashboard Cite

[1] Aircraft observations were performed over the sea near the southwest islands of Japan under Asian Atmospheric Particulate Environmental Change Experiment 2/Asian Pacific Regional Aerosol Characterization Experiment (APEX-E2/ACE-Asia) project during the period of 16-28 April 2001. The polluted air mass from east Asia was associated with very high concentrations of SO 2 (1-10 ppb) and aerosol particles (3000-5000 cm À3 ) in the marine boundary layer. The cloud condensation nuclei (CCN) concentration at 0.3% supersaturation was as high as 800-2000 cm À3 during the penetrations of air pollutants from east Asia. The correlation coefficient between SO 2 and aerosol particles was significant in such polluted atmosphere. Concentration of CCN (N CCN ) was linearly related to concentration of aerosol particles (N AP ) according to N CCN $ 0.75N AP . The ratio of CCN to aerosol condensation nuclei particle concentrations was lower than 0.3 in the relatively clean maritime atmosphere, but it was as high as $0.5 in the continentally influenced atmosphere in the boundary layer. These results indicated that the influence of anthropogenic pollutants from east Asia increased the contribution percentage of aerosol particles to CCN in the polluted atmosphere over the observation area. The observational results also indicated that a mean cloud droplet concentration (N C ) in the continentally influenced clouds was $2 times as much as N C in the relatively clean maritime clouds. The slope of log-log relationship between N C and N CCN was $0.39. This study strongly suggests that high CCN concentration formed many cloud droplets and decreased their effective radius at similar liquid water content under the outflow of air pollutants from east Asia.

show abstract

“…For decades, the chemical characteristics of water-soluble ionic species in aerosols have been intensively studied in various parts of the world. Despite of differences in both meteorological constraints and emission sources, several studies concluded that Cl -and SO 4 2-are major contributors of WSIS mostly found in maritime aerosols whilst K + and NH 4 + have tended to be the main compositions of those particles originated from biomass and agricultural waste burnings (Allen et al, [30]; Kocaka et al [34]; Matsumoto et al [35]; Osada et al [36]; Park et al [31]). Since particulate NO 3 -is a good indicator of those aerosols derived from traffic emissions and other imperfect combustions of fossil fuels, one can take advantage of binary ratios between maritime and biomass burning WSIS to traffic exhaust originated NO 3 -to classify aerosol types.…”

Section: Impact Of Aerosol Types On Variation Of Socmentioning

confidence: 99%

Diurnal variation and vertical distribution of carbonaceous aerosols in the southern part of Thailand

Pongpiachan¹,

Pongnailert²,

Ho³

et al. 2014

WIT Transactions on Ecology and the Environment

View full text Add to dashboard Cite

Carbonaceous compositions, water-soluble ionic species and trace gaseous species were identified and quantified in Hat-Yai city, Thailand. All samples were collected every three hours consecutively from 21:00 h December 17 th to 21:00 h December 20 th at Site 1 (30 m agl), Site 2 (60 m agl) and Site 3 (125 m agl). The averaged concentration of OC was significantly higher at Site 1 than those detected at Site 2 and Site 3 suggesting that anthropogenic activities at ground level might play a major role in governing air quality at ground level. The main objective of this study is to investigate the vertical distribution of carbonaceous aerosols in Hat-Yai's atmosphere for the first time by using IMPROVE TOC (Interagency Monitoring to Protect Visual Environments Total Organic Carbon) protocol. The morning peak of carbonaceous compositions observed during the sampling period of 06:00-09:00 emphasized the main contribution of traffic emissions on OC/EC contents in Hat-Yai city. In this study, we found that aged maritime aerosols from long-range transportation and/or biomass burning particles overwhelmed carbonaceous aerosols at the top of building. Whilst hierarchical cluster analysis and Pearson correlation analysis show some considerable influences of night-time tourism activities on carbonaceous contents at ground level, principal component analysis highlights Air Pollution XXII 63

show abstract

Changes in ionic constituents of free tropospheric aerosol particles obtained at Mt. Norikura (2770 a.s.l.), central Japan, during the Shurin period in 2000

Cited by 34 publications

References 26 publications

Long-term characterization of major water-soluble inorganic ions in PM10 in coastal site on the Japan Sea

Long-term characterization of major water-soluble inorganic ions in PM10 in coastal site on the Japan Sea

Vertical distribution of cloud condensation nuclei concentrations and their effect on microphysical properties of clouds over the sea near the southwest islands of Japan

Diurnal variation and vertical distribution of carbonaceous aerosols in the southern part of Thailand

Contact Info

Product

Resources

About