Thongboonchoo, Narisara

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Thongboonchoo, Narisara
Alternative Name
Thongboonchoo, N.
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Email
narisara.th@kmitl.ac.th

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    Item type:Publication,
    A Lagrangian model investigation of chemico-microphysical evolution of northeast Asian pollution plumes within the MBL during TRACE-P
    (2007-12-01)
    Song, C. H.
    ;
    Han, K. M.
    ;
    Cho, H. J.
    ;
    Kim, J.
    ;
    Carmichael, G. R.
    In this work, we determine the major channels through which air pollutants, mainly originating in Northeast Asian mega-cities, flow out into the Northwestern Pacific atmosphere. For this purpose, comprehensive backward/forward trajectory analyses are conducted. Two important channels along which pollutants from the Northeast Asian mega-cities flow out are defined, and are labeled as "DC8 transport path" and "P3B transport path". We then comprehensively examine the chemico-microphysical transformations of the anthropogenic pollutants from the Northeast Asian mega-cities along the two major transport paths, using a new Lagrangian forward-trajectory photochemical model. In the newly developed model, state-of-the-science parameterizations for considering chemico-microphysical aging processes and atmospheric aerosol processes are incorporated. As air masses travel toward low latitudes through the marine boundary layer (MBL), the temperature increases along the trajectories and large amounts of PAN experience thermal decomposition. By this process, PAN can be an important supplier of NO<inf>2</inf> in the remote MBL. The O<inf>3</inf> productions in the remote Northwestern Pacific MBL are fueled and maintained by NO<inf>x</inf> provided from the PAN decomposition. High O<inf>3</inf> levels (>50 ppb) are observed within the remote MBL of the Northwestern Pacific Oceans from several TRACE-P DC8 and P3B measurements under the continental outflow situations. Gas-phase SO<inf>2</inf> is continuously converted into nss-sulfate via heterogeneous oxidation reaction with H<inf>2</inf>O<inf>2</inf> at a particle pH of 2-5. The Lagrangian-trajectory modeling studies also indicate that in the remote MBL of Northwestern Pacific Ocean under continental outflow situations, conditions are unfavorable for nucleation events, because of the depletion of SO<inf>2</inf>, the large aerosol surface areas available for H<inf>2</inf>SO<inf>4</inf> sink, and high temperatures. © 2007 Elsevier Ltd. All rights reserved.
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    Item type:Publication,
    A compilation and development of spatial and temporal profiles of high-resolution emissions inventory over Thailand
    (2009-01-01)
    Vongmahadlek, Chatchawan
    ;
    Thao, Pham Thi Bich
    ;
    Satayopas, Boonsong
    ;
    Thongboonchoo, Narisara
    Thailand, located in Southeast Asia, has both anthropogenic and natural emission sources. It is important to develop an emission information system to provide fundamental data to support emission control strategies and air quality studies. In this research, emissions were compiled for the year 2005. Emission sources cover key anthropogenic and natural emission sources. The methodology to calculate emissions is based on the bottom-up approach using local specific data. For gaseous species, annual emission estimation is found as follows: 9465.9 Gg of carbon monoxide, 2583.1 Gg of nonmethane volatile organic compounds, 886.0 Gg of sulfur dioxide, 790.3 Gg of oxides of nitrogen, and 439.2 Gg of ammonia. For aerosol species, annual emission estimations are 1277.4 Gg of particulate matter smaller than or equal to 10 μm in aerodynamic diameter, 325.5 Gg of organic carbon, and 136.4 Gg of black carbon. The intercomparison with literature shows an acceptable agreement of annual estimation. Emissions are projected until the year 2027 based on a Business-as-Usual scenario from governmental trends. Spatial allocations with 1- by 1-km resolution and temporal (i.e., monthly, weekly, and diurnal) allocation profiles are also developed to investigate the variation of emissions. Copyright 2009 Air & Waste Management Association.