Long-Range Transport of Asian Dust and Air Pollutants to Taiwan

Lin, Chih-Hong; Liu, Shaw Chen; Chou, Charles C.‐K.; Liu, Tsun Hsien; Lee, Chung Te; Yuan, Chung Shin; Shiu, Chengshi; Young, Chea-Yuan

doi:10.3319/tao.2004.15.5.759(adse)

Cited by 94 publications

(74 citation statements)

References 35 publications

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“…For details on the variation of PM 2.5 compositions, refer to Chuang et al (2008a, b). For a discussion of their dynamics, refer to Lin et al (2004Lin et al ( , 2005Lin et al ( , 2007Lin et al ( , 2012a.…”

Section: Lrt Type: Description Of Nov 2 Episodementioning

confidence: 99%

“…These studies included research on outflows of China's dust transport to Northeast Asia (Nishikawa et al, 2000;Kim and Park, 2001;Han et al, 2004; and even North America (McKendry et al, 2001) or to southern areas, such as Taiwan Liu et al, 2006;Lee et al, 2006;Chuang et al, 2008b;Hsu et al, 2010). Lin et al (2004Lin et al ( , 2005Lin et al ( , 2007 claimed that China's dust transport is usually abundant in cold fronts and reaches Taiwan. Lee et al (2006) observed that in the transportation of dust plumes, PM 2.5 concentrations, similar to coase mode particulates, were elevated.…”

Section: Introductionmentioning

confidence: 99%

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A Simulation Study on PM2.5 Sources and Meteorological Characteristics at the Northern Tip of Taiwan in the Early Stage of the Asian Haze Period

Chuang

Chou

Lin

et al. 2017

Aerosol Air Qual. Res.

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The present study utilizes air quality modeling to probe the sources and characteristics of PM 2.5 (particles less than 2.5 micrometers in aerodynamic diameter) at the northern tip of Taiwan (CAFE station) in the early stage of the Asian haze period. Since CAFE is the first place that is influenced by the Asian haze coming from the north, this study focused on the wind field, PM 2.5 concentration, and PM 2.5 composition at CAFE. During the research period (Oct. 16, 2015, to Nov. 15, 2015, four PM 2.5 episodes occurred at CAFE. This study classified these four episodes into three types, according to their PM 2.5 sources: the long-range transport (LRT) type, the local pollution (LP) type, and the LRT/LP mix type. For the LRT type, Asian outflows prevailed in a north to northeast wind at the north of Taiwan. The proportion of NO 3 -in the PM 2.5 resolvable compositions was very small at CAFE due to evaporation during transport, whereas the relative proportion of sea salt increased due to strong winds. For the LP type, an east wind prevailed and formed a cyclone/lee vortex in northwest Taiwan. Although the background PM 2.5 concentrations were low (4-20 µg m -3 ), the cyclone transported local anthropogenic emissions northward and elevated the PM 2.5 levels at CAFE. For the LRT/LP mix type, an east wind also prevailed, but the background PM 2.5 concentrations were at an intermediate level (20-30 µg m -3 ) because the Asian outflows had already transported haze to the West Pacific. The combined LRT and LP increased PM 2.5 at CAFE. In addition, the proportions of NO 3 -(nitrate) for the LP and LRT/LP episodes were obviously higher than those on the days before and after. This suggests a considerable contribution on PM 2.5 from LP.

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Section: Lrt Type: Description Of Nov 2 Episodementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Simulation Study on PM2.5 Sources and Meteorological Characteristics at the Northern Tip of Taiwan in the Early Stage of the Asian Haze Period

Chuang

Chou

Lin

et al. 2017

Aerosol Air Qual. Res.

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“…In general, the northeast monsoon prevails from late autumn to early spring, while the southwest monsoon prevails in late spring and early autumn Lin et al, 2004;Lin et al, 2007). In this study, we investigated the variation in atmospheric PCDD/F concentrations during a northeast monsoon episode that covered the period 2007/11/29 to 2007/12/6.…”

Section: Variation In Ambient Pcdd/f Concentrations In Northern Taiwamentioning

confidence: 99%

Increase of Ambient PCDD/F Concentrations in Northern Taiwan during Asian Dust Storm and Winter Monsoon Episodes

Hsien¹,

Chou

Peng

et al. 2014

Aerosol Air Qual. Res.

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In the spring, Asian dust storms that originate in the deserts of Mongolia and China eventually reach the populated areas of East Asia. The dust storm particles usually contain diverse organic matter and nutrients that may have an adverse effect on human health. In winter, northeast monsoon episodes that originate in the mainland China not only bring cold air but also transport dust and air pollutants to Taiwan over long distances. Based on the above, the presence of persistent organic pollutants (POPs), including polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), in the suspended particles undergoing long-range transport needs to be investigated. In this study, the atmospheric concentrations of PCDD/Fs were monitored and investigated during an Asian dust storm episode and northeast monsoon episode in northern Taiwan. The sampling results indicate that the atmospheric PCDD/Fs observed at two remote sampling sites ranged from 7.46 ± 0.7 to 37. rd December 2008, respectively. Specifically, higher levels of PCDFs (by 70%-76%) were measured in northern Taiwan during these long-range transport periods. As no specific dioxin emission sources exist within 20 km of our sampling sites, the increase in PCDD/F concentrations observed at these two remote sampling sites is likely to be related to the Asian dust storm and northeast monsoon episodes and the pollutants would seem to have come from mainland China.

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“…Therefore, we finally selected four remote sites instead in this study. Lin et al (2004) estimated that the occurrence frequency of long-range transport of air pollutants and dust reached 7% in winter and spring, by examining the air pollution data of both clean and polluted days. In this study, we just focused on the pollution events in Shanghai.…”

Section: Impact Of Pollutant Transport On Air Qualitymentioning

confidence: 99%

“…Frequent biomass burning in Zhejiang, Jiangsu and Anhui provinces may also worsen the air quality of Shanghai during the harvest time around May and June every year . Lin et al (2004) developed an objective method to classify transport processes and estimate the contribution of long-range transport to the air quality of Taiwan. Wai and Tanner (2005) analyzed the influence of meteorological factors and estimated the impact of long-range transport on the air quality of Hong Kong.…”

Section: Introductionmentioning

confidence: 99%

Impact of Pollutant Transport on the Air Quality of Shanghai in 2007

Yan

Wang

et al. 2011

SOLA

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Pollutant transport has a significant impact on the air quality of Shanghai. To quantify this impact, we comprehensively analyze the characteristics and formation mechanisms of air pollution in Shanghai, using a data set covering five selected air quality monitoring sites and a meteorological site. We find air pollution events occur ~10% of the year. These events are classified into three typical categories, namely the local pollution case (LP), the dust storm case (DS) and the regional transport case (RT), based on temporal variations and spatial distributions of PM 10 and gaseous pollutants as well as meteorological factors and backward trajectories. The ratios of SO 2 /PM 10 , NO 2 /PM 10 and PM 2.5 /PM 10 are used as indicators of long-range transport of mineral dust, while CO proves to be a good tracer of regional transport of anthropogenic pollutants. In 2007, 64% of all pollution events were RT and the mean PM 10 concentration reached 220 μg m . We estimate that transport contribution to PM 10 abundance was within the range of 34% to 64% by comparing the anomaly of the background concentration with the urban concentration.

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Long-Range Transport of Asian Dust and Air Pollutants to Taiwan

Abstract: Vol. 15, No. 5, December 2004 760 range transport. When this contribution is taken into account, we estimate that the contribution of long-range transport to PM 10 abundance in northern Taiwan during winter and spring to be in the range of 50% to 75%.

Cited by 94 publications

References 35 publications

A Simulation Study on PM2.5 Sources and Meteorological Characteristics at the Northern Tip of Taiwan in the Early Stage of the Asian Haze Period

A Simulation Study on PM2.5 Sources and Meteorological Characteristics at the Northern Tip of Taiwan in the Early Stage of the Asian Haze Period

Increase of Ambient PCDD/F Concentrations in Northern Taiwan during Asian Dust Storm and Winter Monsoon Episodes

Impact of Pollutant Transport on the Air Quality of Shanghai in 2007

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