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,
    Simulating the transport and chemical evolution of biomass burning pollutants originating from Southeast Asia during 7-SEAS/2010 Dongsha experiment
    (2015-07-01)
    Chuang, Ming Tung
    ;
    Fu, Joshua S.
    ;
    Lin, Neng Huei
    ;
    Lee, Chung Te
    ;
    Gao, Yang
    This study aimed to simulate the transport of biomass burning (BB) aerosol originating from Southeast Asia (SEA) during the Dongsha Experiment conducted from March 2010 to April 2010. Transport pathways were reanalyzed and steering flow in the mid-latitude areas and anticyclones in low-latitude areas were found to control the transport of BB plume after it was injected to a high atmosphere. For the 12 simulated and observed events at Mt. Lulin (2862m MSL; 23°28'07″ N, 120°52'25″ E), the 72h backward trajectories were all tracked back to southern China and northern Indochina, which were the locations of the largest BB fire activities in SEA. Chemical evolutions of BB pollutants along the moving trajectories showed that organic matter was always the dominant component in PM<inf>2.5</inf>, consistent with the observations at both near-source regions and Mt. Lulin. For nitrogen species, nearly all NO<inf>x</inf> molecules oxidized into HNO<inf>3</inf>, NO<inf>3</inf><sup>-</sup>, PAN, and PANX in fires or near fires. The synchronic consumption of NO<inf>x</inf>, SO<inf>2</inf>, and NH<inf>3</inf> explained the production of the major components of inorganic salts. In the moving BB plume, sulfate concentration increased with decreased nitrate concentration. Ratios of ammonium to PM<inf>2.5</inf> and elemental carbon to PM<inf>2.5</inf> remained nearly constant because additional sources were lacking.
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    Item type:Publication,
    Long-term analysis of NO2, CO, and AOD seasonal variability using satellite observations over Asia and intercomparison with emission inventories and model
    (2013-12-01)
    Lalitaporn, Pichnaree
    ;
    Kurata, Gakuji
    ;
    Matsuoka, Yuzuru
    ;
    Thongboonchoo, Narisara
    ;
    Surapipith, Vanisa
    Long-term analysis of tropospheric nitrogen dioxide (NO<inf>2</inf>) columns retrieved from GOME, SCIAMACHY, OMI and GOME-2 satellites, carbon monoxide (CO) columns from MOPITT satellite, and aerosol optical depths (AODs) from MODIS satellite was performed for Southeast Asian countries including Japan and China during 1996-2012. The results show that significant increasing levels of tropospheric NO<inf>2</inf> columns can be clearly observed during the study period, especially above the eastern regions of China. The cities located in different latitude zones present the seasonal cycle of NO<inf>2</inf> columns, CO columns, and AODs differently. For the cities located around mid-latitude zone, the maximum levels of NO<inf>2</inf> and CO columns can be observed in the winter (November-March) and the minimum in the summer (June-September). On the contrary, the maximum levels for the cities near Equator zone are revealed in dry season (June-October). In the case of AODs, the maximum peaks normally occur during biomass burning season. Ground monitoring concentrations of NO<inf>2</inf>, CO, and PM<inf>10</inf> were also comparably analyzed with satellite NO<inf>2</inf> columns, CO columns, and AODs, respectively. Anthropogenic and biomass burning emissions were derived to investigate the consistency with satellite retrievals. The results show that satellite observations are able to capture the trend and seasonal variability of the emissions and ground concentrations. The model simulations were conducted using CMAQ model. Generally, simulated model results agree well with those retrieved from satellite measurements for spatial distribution and seasonal pattern. However, the modeled results underestimate satellite data probably due to the inaccuracy in emission inventories, the inaccuracy of spatial and temporal allocations, and the uncertainties in the satellite retrievals. © 2013 Springer Science+Business Media Dordrecht.