Climate and weather characteristics in association with the active fires in northern Southeast Asia and spring air pollution in Taiwan during 2010 7-SEAS/Dongsha Experiment

Yen, Ming Cheng; Peng, Chi Ming; Chen, Tsing Chang; Chen, Ching Sen; Lin, Neng Huei; Tzeng, Ren Yow; Lee, Yung An; Lin, Cheng Chih

doi:10.1016/j.atmosenv.2012.11.015

Cited by 70 publications

(57 citation statements)

References 40 publications

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“…Mt. Lulin is under the influence of Southeast Asian biomass-burning particle emissions in spring due to transport by high altitude westerlies (Yen et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

Experimental Comparison of Two Portable and Real-Time Size Distribution Analyzers for Nano/Submicron Aerosol Measurements

Hsiao

Lee

Chen

et al. 2016

Aerosol Air Qual. Res.

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Two portable, battery powered particle size distribution analyzers, TSI NanoScan scanning mobility particle sizer (TSI NanoScan SMPS 3910, USA) and Kanomax Portable Aerosol Mobility Spectrometer (Kanomax PAMS 3300, Japan), have been recently introduced to the market. Both are compact and allow researchers to rapidly measure and monitor ambient or indoor ultrafine and nanoparticles in real time. In addition, both instruments apply the SMPS measuring scheme, utilizing a corona charger in place of a radioactive neutralizer, and are integrated with a hand-held condensation particle counter (CPC). In this study, the different designs, flow schemes, and operational settings of both instruments have been summarized based on the information released by the manufacturers and the available published literature. The performance characteristics and monitoring capability of these two portable ultrafine to nanoparticle sizers were investigated and compared to a reference TSI 3936 lab-based SMPS under identical conditions. Reasonable agreement was found between the three instruments in terms of their efficiency in sizing and counting polydispersed particles. Of the two portable analyzers, PAMS was able to provide a higher sizing resolution for monodispersed particle measurements than NanoScan, when operated under the High Mode (higher sheath to aerosol flow ratio).

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“…Mt. Lulin is under the influence of Southeast Asian biomass-burning particle emissions in spring due to transport by high altitude westerlies (Yen et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

Experimental Comparison of Two Portable and Real-Time Size Distribution Analyzers for Nano/Submicron Aerosol Measurements

Hsiao

Lee

Chen

et al. 2016

Aerosol Air Qual. Res.

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“…Surface and ozonesonde measurements in southern China in the spring showed significant enhancements in CO, black carbon aerosol (BC), PM 2.5 , PM 10 , and ozone when the local air was impacted by air masses back-traceable to PSEA (Liu et al, 1999;Chan et al, 2000;Deng et al, 2008;Lin et al, 2009Yen et al, 2012). Using a regional model, Fu et al (2012) found that the long-range transport of PSEA biomass-burning emissions during spring 2006 contributed significantly to the monthly mean surface concentrations of CO (20-50 %), ozone (10-30 %), and PM 2.5 (10-70 %) in southern China, as well as leading to 2-5 ppbv ozone enhancement in the lower troposphere over the western Pacific.…”

Section: Y Jian and T-m Fu: Injection Heights Of Springtime Biomasmentioning

confidence: 99%

Injection heights of springtime biomass-burning plumes over peninsular Southeast Asia and their impacts on long-range pollutant transport

Yuan

2014

Atmos. Chem. Phys.

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Abstract. We analyzed observations from the Multi-angle Imaging SpectroRadiometer (MISR) to determine the injection heights of biomass-burning smoke plumes over peninsular Southeast Asia (PSEA, here defined as Vietnam, Cambodia, Thailand, Laos, and Myanmar) in the spring, with the goal of evaluating the impacts on long-range pollutant transport. We retrieved the heights of 22 000 MISR smoke pixels from 607 smoke plumes over PSEA during February to April of the years 2001-2010. Forty-five percent of the analyzed smoke pixels were above the local mean boundary layer (1 km) at MISR overpass time (10:30 a.m. local time). We used the GEOS-Chem model to simulate the transport of PSEA biomass-burning pollutants in March 2001. On a monthly mean basis, we found that the direct injection of 40 % of the PSEA biomass-burning emissions had little impact on the long-range transport of CO to downwind regions, compared to a control simulation where all biomass-burning emissions were released in the boundary layer. This was because CO at the surface over PSEA was efficiently lifted into the free troposphere by deep convection associated with synoptic-scale weather systems. For pollutants with lifetimes shorter than the synoptic timescale, such as black carbon aerosol (BC), their long-range transport was much more sensitive to the initial plume injection height. The direct injection of NO x from PSEA biomass burning into the free troposphere drove increased formation and transport of peroxyacetyl nitrate (PAN), which in turn led to a small increase in ozone over downwind southern China and the northwestern Pacific. The Pacific subtropical high transported BC emitted from PSEA biomass burning to the marine boundary layer over the tropical northwestern Pacific. We compared our model results to aircraft measurements over the northwestern Pacific during the TRACE-P campaign (March 2001). The direct injection of 40 % of the PSEA biomass-burning pollutants into the free troposphere in the model led to a more pronounced BC peak at 3 km over the northwestern Pacific. Our analysis highlights the point that the injection heights of smoke plumes presents great uncertainty over the interpretation of BC measurements downwind of biomass-burning regions.

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“…The contributions of BB and non-BB emissions were 16% and 84%, respectively, from April 16 to April 30, 2010. This finding follows the peak of the SEA BB activity in March 2010 and the subsequent decline in April 2010 as observed by Yen et al (2013).…”

Section: Impact Of Pm 25 From Bb and Non-bb Emissionsmentioning

confidence: 64%

“…Later, Yen et al (2013) suggested that a cold surge causes a downward flow that drags high-altitude BB pollutants to the ground and found that a cold surge accompanied with a cold front or a cold surge that occurred one or two days after a cold front passed Taiwan on March 9, 16, and 25 and on April 2, 7, and 13 in 2010 resulted in the deterioration of the air quality at the Hengchun ground site. Therefore, Yen et al (2013) suggested that the high-altitude BB plume is the cause of occasional air quality deterioration in Hengchun. In the present study, the downward motion in the cold surge may transport the high-altitude BB plume to the ground.…”

Section: High-altitude Bb Plume Affected the Air Quality On The Groundmentioning

confidence: 99%

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The Simulation of Long-Range Transport of Biomass Burning Plume and Short-Range Transport of Anthropogenic Pollutants to a Mountain Observatory in East Asia during the 7-SEAS/2010 Dongsha Experiment

Chuang

Lee

et al. 2016

Aerosol Air Qual. Res.

Self Cite

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The Community Multi-scale Air Quality Model (CMAQ) is used to simulate the long-range transport of biomass burning (BB) pollutants from Southeast Asia (SEA) towards the Taiwan Central Mountain Range (CMR) in March and April 2010. The results show that a proportion of the BB plume was blocked and compressed at the windward side of CMR. High-altitude BB plume is shown to influence air quality on the ground via three mechanisms: (1) the subsidence in the anticyclone, (2) the downward motion in the cold surge, and (3) the vertical mixing of the boundary layer over land. Two case studies are further investigated to probe the chemical evolution of the air parcel approaching Mt. Lulin. The first case shows that the third mechanism also explained the increase in the concentrations of peroxyacyl nitrate (PAN), higher peroxyacyl nitrate (PANX), NH 3 , SO 2 , and volatile organic compounds in the BB plume when entering the land over western Taiwan. Meanwhile, the percentage of NO 3 -in the plume is also significantly increased. The second case reveals that valley wind transported air pollutants from the ground to the mountains. The air parcel, accompanied with considerable concentrations of PAN, PANX, SULF, and anthropogenic secondary organic aerosol, moved up Mt. Lulin. The pollutant concentrations, except for elemental carbon, in the air parcel decreased on approach to Mt. Lulin because the air parcel was mixed with a clean air.

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Climate and weather characteristics in association with the active fires in northern Southeast Asia and spring air pollution in Taiwan during 2010 7-SEAS/Dongsha Experiment

Cited by 70 publications

References 40 publications

Experimental Comparison of Two Portable and Real-Time Size Distribution Analyzers for Nano/Submicron Aerosol Measurements

Experimental Comparison of Two Portable and Real-Time Size Distribution Analyzers for Nano/Submicron Aerosol Measurements

Injection heights of springtime biomass-burning plumes over peninsular Southeast Asia and their impacts on long-range pollutant transport

The Simulation of Long-Range Transport of Biomass Burning Plume and Short-Range Transport of Anthropogenic Pollutants to a Mountain Observatory in East Asia during the 7-SEAS/2010 Dongsha Experiment

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