• Title, Summary, Keyword: Asian dust

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The Characteristics of the Aerosol Number Concentration in Jeju Area During Asian Dust Events (황사 시 제주지역 에어로졸의 수농도 특성)

  • Kang, Chang-Hee;Hu, Chul-Goo
    • Journal of Environmental Science International
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    • v.22 no.3
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    • pp.347-358
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    • 2013
  • The aerosol number concentration have measured with an aerodynamic particle sizer spectrometer(APS) at Gosan in Jeju Island, which is known as background area in Korea, from March 2010 to February 2011. The obtained results of asian dust events and non-asian dust period have been compared. The results show that the entire averaged aerosol number concentration from APS measurement during asian dust events and non-asian dust period are about 341 particles/$cm^3$ and 240 particles/$cm^3$, respectively. During asian dust events, the number concentration in small size ranges(${\leq}0.4{\mu}m$) are similar to non-asian dust period, however, those in large size ranges(${\geq}0.7{\mu}m$) are very higher than non-asian dust period. The contributions of the size resolved number concentration(23 channel in $0.25{\sim}10.0{\mu}m$) to total number concentration in that range are dramatically decreased with increased particle size. The contributions of smaller size ranges(${\leq}0.4{\mu}m$) during asian dust events are very low compared with non-asian dust period, on the other hand, those of larger size ranges(${\geq}0.4{\mu}m$) are higher than non-asian dust period. The number concentration in each size range are strongly correlated with the concentration in adjacent size range. And the total aerosol number concentration are depended on the number concentration in range of smaller than $0.58{\mu}m$ during non-asian dust period and asian dust events. On the other hand, $PM_{10}$ mass concentration has mainly affected with the number concentration in range of smaller than $1.0{\mu}m$ during non-asian dust period, however, during asian dust events, the mass concentration has mainly affected with the number concentration in range of $0.65{\sim}3.0{\mu}m$.

Relationship between Asian Dust and Asthma Disease in Seoul during 2005~2008 (황사현상이 천식질환에 미치는 영향도 분석: 2005년부터 2008년 서울지역을 중심으로)

  • Lee, Joong-Woo;Lee, Ki-Kwang
    • Journal of Environmental Science International
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    • v.20 no.4
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    • pp.493-500
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    • 2011
  • This study investigates the relationship between Asian dust and asthma disease in Seoul, using data of Asian dust occurrences and the number of treatments for asthma between 2005 and 2008. The data include the number of treatments for asthma on the basic day paired with the average number of treatments for asthma on the compared days. The compared day is defined by the day of no Asian dust in same month and day of the week as the basic day, when Asian dust occurs. Also, the basic day is expanded to the day after three days from the day of Asian dust. The paired two sample t-test for the number of treatments for asthma on the basic day and the compared days revealed that the Asian dust occurrences are correlated with the asthma disease. The number of treatments for asthma is significantly increased on the one and two days after Asian dust occurs. On the other hand, there's no significant difference in the number of treatments for asthma between the days of Asian dust occurrence and the days of no Asian dust, which implies that people usually try not to go out when Asian dust occurs.

Characteristics of wintertime Asian Dust occurrence at Busan (부산지역의 겨울철 황사 발생 특성)

  • Jeon, Byung-Il
    • Journal of Environmental Impact Assessment
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    • v.21 no.4
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    • pp.581-591
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    • 2012
  • The purpose of this study was to analyze the characteristics of fine particles concentration and meteorological parameters, and long range transport of wintertime Asian dust at Busan. Also we studied occurrence frequency and tendency of wintertime Asian dust from 1961 to 2010 in Korea. Asian dust occurred most frequently in the spring, the next to winter in Korea. Wintertime Asian dust is steadily increasing recently. Asian dust in Busan was the most occurred in 2001 with 21 days, followed by 12 days in 2002, and 10 days in 2006. The annual mean frequency during the past 12 years(1999~2010) was 7.5 days, and it was two times more than that during the past 50 years(3.8 days). Wintertime Asian dust in Busan has occurred 6 episodes since 2008, and it all occurred in December except for 20 Feb. 2009. The highest concentration of wintertime Asian dust was recorded mostly at Hakjangdong and Jangrimdong which are industrial area. Maintenance time of Asian dust at Busan was from 1hr 30min to 9hr 20min, it was shorter than in the spring. It took from 10 to 15 hours move to Busan after Asian dust was first detected in Korea. Wintertime Asian dust originated from Gobi desert in Mongolia and inner Mongolia near China, except for 9 Dec. 2008 at Busan.

A Development and Application of the Environmental Education Text Book about the Asian Dust in the Elementary School (초등학교에서 황사에 관한 환경교육 교재의 개발과 적용)

  • Chun, Jong-Suk;Moon, Yun-Seob;Hur, Yong-Won
    • Hwankyungkyoyuk
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    • v.21 no.2
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    • pp.51-67
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    • 2008
  • The purpose of this study is to develop and applicate the elementary environmental textbook in order to solve its problem and to improve attitude related to the Asian dust. The results in this research are as follows. First, it was showed that three groups who composed of teachers, parents and students in the elementary school had recognized the serosities and problems caused by the Asian dust form TV, and that such problems was associated with increase of the desertification and the global warming. Especially the student group insist that the cause in Asian dust is due to the natural phenomena or industrialization. Second, as a result in analysis on the Asian dust through both textbooks on the 7th elementary curriculum and subsidiary textbooks, contents concerning Asian dusts was little or noting. In addition, in the subjects of Science, Society and Health for the 5th and 6th grade students in the elementary school, they were explained partially as one of the air pollutants. Third, the elementary environmental textbook on the Asian dust was developed for the 5th and 6th grade students. The textbook is composed of four contents on the material which is harmful of the human health and life in Asian dust, the special news of Asian dust, and the best answer to solve Asian dust as well as the cause and the source of Asian dust. Forth, as a result in classes using the environmental textbook developed by four themes about the Asian dust, its application is meaningful in the level of p value in the view of knowledge, awareness and attitude of the experiment group. They was more improved in 37%, 14%, and 15%, respectively, than the comparative group. In conclusion, the environmental textbook related to Asian dust will play an important role in useful tool to understand the right knowledge, awareness, and attitude which makes an effort on its effective management in the elementary school.

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Perceptions of the Asian Dust - Analysis of the Newspaper Articles about the Asian Dust - (황사에 대한 인식 조사 -황사 관련 신문 기사 내용 분석-)

  • Im, Hyoung-June;Ha, Mi-Na;Cho, Soo-Hun;Kwon, Ho-Jang
    • Journal of Preventive Medicine and Public Health
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    • v.36 no.3
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    • pp.298-301
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    • 2003
  • Objectives : There is an increasing concern for the social, economic, environmental and health effects of the Asian dust (Hwang-sa in Korean language) in Korea. In this study, we intended to indirectly determine ordinary people's perception about the Asian dust by analyzing the contents of newspaper articles dealing with it. Methods: By using article searching services in the internet websites of three newspaper companies, we collected newspaper articles dealing with the Asian dust during the period from January $1^{st}$ of 1998 to December $31^{st}$ of 2002. We classified the articles into four categories: those forecasting the occurrence of the Asian dust, those about measures to cope with it, those about its occurrence in the neighboring foreign countries, and those about its effects. In particular, we analyzed articles about the health effects of the Asian dust more distinctly. Results : A total of 1,225 articles dealing with the Asian dust were found during the 5 year period. The number of articles increased from 102 in 1998 to 518 in 2002, approximately a five-fold increase, The numbers of articles about health effects, environmental effects and economical effects were 191 (44%), 171 (41%) and 147 (34%), respectively. It was reported that various diseases such as respiratory diseases (87%), eye problems (69%), and skin diseases (12%) were associated with the Asian dust. Conclusion : The increasing concern for the negative effects of the Asian dust necessitates more studios about this field. As the effects of the Asian dust are various, the information on the major concern of ordinary people could help establish the research agendas and measures for the Asian dust.

The Recognition for Asian-dust in North-East Asia (동북아 황사문제에 대한 일반인의 인식)

  • Jung Chang-Hoon
    • Journal of Environmental Science International
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    • v.13 no.12
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    • pp.1145-1150
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    • 2004
  • Dust phenomenon is a critical thing in the East Asian countries. However, it is quite recent that Asian dust has drawn much attention and the scientific investigation of dust particles began. In this study, the recognition for Asian-dust in Northeast Asia region was analyzed. The survey results show that the people generally recognize the origins and seriousness of Asian dust and understand the difficulty in solving the dust related problems. However, approaches to figure out Asian dust have many difficulties and limits in scientific, economic and political points of view and more detailed road map is needed based on government policy.

Characteristics of Recent Occurrence Frequency of Asian dust over the Source Regions - Analysis of the dust Occurrences since 2002 (최근의 황사 발원지에서의 먼지 발생 특성-2002년 이후 먼지발생 경향 분석)

  • Lee, Jong-Jae;Kim, Cheol-Hee
    • Atmosphere
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    • v.18 no.4
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    • pp.493-506
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    • 2008
  • In order to examine the variational features of Asian dust outbreak in recent years, observed WMO synop data were employed for the period from 1996 to 2007. We first divided Asian dust source regions into four subregions; 1) Taklamakan, 2) Gobi, 3) Inner Mongolia-Manchuria and 4) Loess, and the meteorogical variables such as wind speed, precipitation and threshold wind speed observed during the Asian dust outbreak period were compared with those during non-Asian dust period. The results showed that temporal variation of occurrence frequency of dust outbreak had a strong positive correlation with the frequency of strong wind speed and low precipitation in each of the 4 source regions. Spatial distributions of frequency of dust occurrence after 2002 showed increasing trend in Gobi and Inner Mongolia-Manchuria but decreasing trend in Loess region. This is showing a shift in main source region toward Northwest, especially since 2003.

Aerosol Vertical Distribution Measured by LIDARs in Baengnyeongdo, Munsan, and Gunsan during 10~11 May 2010 (백령도, 문산, 군산의 라이다로 측정한 에어로졸 연직분포 -2010년 5월 10~11일 황사를 중심으로-)

  • Lee, Hae-Jung;Kim, Jeong Eun;Chun, Youngsin
    • Atmosphere
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    • v.23 no.4
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    • pp.519-526
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    • 2013
  • This study aims to analyze the vertical distribution of Asian dust measured by LIDARs at three weather stations in Baengnyeongdo (BND), Munsan (MS), and Gunsan (GS) during 10~11 May 2010, and thereby investigate their effectiveness. Asian dust passed through from central to south-western part of Korea. Although dust particles were detected over the surface in MS and GS, LIDAR data showed that the Asian dust with non-spherical particles was observed in all of the three regions. It seems that the naked-eye observation could not detect dust over the surface of BND due to the temperature inversion below a height of 0.45 km. During the Asian dust events, the duration time of dust presented 9.5 hr (BND), 19.5 hr (MS), and 24.5 hr (GS), respectively with the longest time in GS, whereas dust altitudes ranged from 0.4 to 1.3 km (BND), 0.1 to 2.8 km and 4.1 to 4.2 km (MS), and 0.2 to 2.0 km (GS), respectively, while showing the highest altitude in MS. Aerosol optical thickness (AOT) retrieved by LIDAR and skyradiometer (SR), located close to the LIDAR sites, was compared. MS (LIDAR) and Seoul (SR) attained the AOT of 0.64 and 0.50, and GS (LIDAR) and Gongju (SR) attained the AOT of 0.38 and 0.54, respectively. As SR-derived angstrom exponents (AE) during the time period determined as Asian dust by LIDAR data were 0.17 in Seoul (near MS) and 0.30 in Gongju (near GS), it can be said that the characteristics of dust particles were appeared. During the study period, depolarization ratio could serve as a useful indicator to determine dust aerosol. But, it still seems essential to conduct further investigation with longer period of data to better describe the discrepancy of AOT between LIDARs and SR.

Environmental Analysis in Asian Dust Source Region Using Satellite Remotely Sensed Data

  • Kyung, Hye-Mee;Kim, Young-Seup;Kim, Sang-Woo
    • Korean Journal of Remote Sensing
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    • v.19 no.3
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    • pp.223-231
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    • 2003
  • With the negative influences and damage from Asian dust increasing, it's getting important to investigate the climate and soil condition of the source region of Asian dust. There is a high possibility that the desertification and the drastic decrease of plants in China and Mongolia make worse the situation (bad effects of Asian Dust). To detect the movement of Asian dust caused by air circulation, we need to watch the state of the source region to get useful information for the prevention of the dust pollution, and to predict what part of China will become the source region. Therefore, using TOMS aerosol index data, NCEP reanalysis data that is Remote Sensing data from 1981 to 2000 (except 1993~1996, 4 years), for 16 years, examined the relation between the dust occurrence and weather elements. Dust occurrence appeared much in spring season from March to May in study areas. It had a dry climate during that season as follows : relative humidity about 20~40%, temperature about -5~5$^{\circ}C$, precipitation about 33-180 mm, wind speed about 4-10 ms-1. Dust occurrence and weather element annual change in study areas decreased gradually till 1990, but in Gobi desert the incidence of dust occurrence increased since 1997. As a result, found out that the more the precipitation, the less dust occurrence, because the precipitation and surface wind speed had a direct influence on the soil of the source region of dust.

The Features of Asian Dust Events Originated in Manchuria (만주에서 발원한 황사현상 (II) -2001년 이후 사례를 중심으로-)

  • Kim, Sumin;Chun, Youngsin;Kim, Seung-Bum
    • Atmosphere
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    • v.20 no.3
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    • pp.273-286
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    • 2010
  • The northeast part of China(hereafter Manchuria) is one of Asian dust source regions along with Gobi, Inner Mongolia and Loess Plateau. In this study, a geographical survey over the area was carried out to determine its soil characteristics in June 2009. It revealed that some parts of the area, especially near Keerchin desert, consist of alkali clay soil mixed up with sand. Manchuria, where is a vast cornfield, can be a potential source region of Asian dust from fall to following spring after harvesting. The frequency of Asian dust over the region from 1996 to 2009 was examined using 3-hourly GTS SYNOP data and it showed that the occurrence of Asian dust over the region is high in the springtime. It was also revealed that snow cover is the key parameter affecting on the frequency through the analysis of NCEP reanalysis data. To scrutinize the path and structure of Asian dust from Manchuria, the event on 3~4 April 2008 and 25 January 2010 were intensively investigated with regard to features of synoptic weather patterns, satellite imagery, airstream, naked eye-observations, concentrations of PM10, 2.5 and 1.0. For this case, the Asian dust from the area reached to Korea less than a day. However, the duration time of the dust in Korea was short (< 7 hours). The average of hourly PM10 reached up to $340{\mu}g/m^{3}$ at Baengnyeondo during the period. The high PM2.5 and PM1.0 concentrations were also observed at several sites in Korea, indicating that air pollutants could be transported along with the dust.