TY - JOUR
T1 - Characterization of aerosol chemical properties from near-source biomass burning in the northern Indochina during 7-SEAS/Dongsha experiment
AU - Chuang, Ming Tung
AU - Chou, Charles C.K.
AU - Sopajaree, Khajornsak
AU - Lin, Neng Huei
AU - Wang, Jia Lin
AU - Sheu, Guey Rong
AU - Chang, You Jia
AU - Lee, Chung Te
N1 - Funding Information:
We express our deep gratitude for the financial support from the Taiwan National Science Council under grant NSC 98-2111-M-008-023-MY3 and for the assistance from Chiangmai University , Thailand. We would also like to acknowledge the US NOAA for providing satellite images for BB fire detection.
PY - 2013/10
Y1 - 2013/10
N2 - Biomass burning (BB) in Indochina produces a great amount of aerosols, but related information on this phenomenon is scarce. In the present study, aerosol samples were collected from Suthep Mountain (98° 53'E, 18° 48'N, 1396m) in Chiangmai, Northern Indochina, in March and April 2010. To our knowledge, this study is the first to reveal the chemical characteristics of BB aerosol near the burning sources in Indochina. The composition analyzed included water-soluble ions, carbonaceous fractions obtained using the thermal optical reflectance method, low-molecular-weight dicarboxylates, anhydrosugars, and water-soluble organic carbon (WSOC). Enriched tracers from the collected aerosols, such as potassium ion (K+) and levoglucosan, confirmed that the samples were influenced by BB activity. The percentage of K+ in PM2.5 (2.51%±0.31%) in the present study is higher than that in other studies. The analysis also showed that directly emitted organic carbon (OC) is the most abundant component in the collected particles. The percentage of WSOC in OC in the present study is greater than that in laboratory experiments. Moreover, the char-EC to soot-EC ratio (defined as the ratio of the subtraction of pyrolized OC from the measured EC1, EC1-OP, over the sum of EC2 and EC3) of 9.4±3.8 in PM2.5 is similar to the value of BB in the literature. Using the recognized BB aerosol tracers K+ and levoglucosan, the present study inferred that PM2.5 EC1-OP and OC3 are also good BB tracers near sources. The collected BB aerosols may have been contributed by the smoldering state of softwood burning.
AB - Biomass burning (BB) in Indochina produces a great amount of aerosols, but related information on this phenomenon is scarce. In the present study, aerosol samples were collected from Suthep Mountain (98° 53'E, 18° 48'N, 1396m) in Chiangmai, Northern Indochina, in March and April 2010. To our knowledge, this study is the first to reveal the chemical characteristics of BB aerosol near the burning sources in Indochina. The composition analyzed included water-soluble ions, carbonaceous fractions obtained using the thermal optical reflectance method, low-molecular-weight dicarboxylates, anhydrosugars, and water-soluble organic carbon (WSOC). Enriched tracers from the collected aerosols, such as potassium ion (K+) and levoglucosan, confirmed that the samples were influenced by BB activity. The percentage of K+ in PM2.5 (2.51%±0.31%) in the present study is higher than that in other studies. The analysis also showed that directly emitted organic carbon (OC) is the most abundant component in the collected particles. The percentage of WSOC in OC in the present study is greater than that in laboratory experiments. Moreover, the char-EC to soot-EC ratio (defined as the ratio of the subtraction of pyrolized OC from the measured EC1, EC1-OP, over the sum of EC2 and EC3) of 9.4±3.8 in PM2.5 is similar to the value of BB in the literature. Using the recognized BB aerosol tracers K+ and levoglucosan, the present study inferred that PM2.5 EC1-OP and OC3 are also good BB tracers near sources. The collected BB aerosols may have been contributed by the smoldering state of softwood burning.
KW - Aerosol chemical composition
KW - Aerosol source profile
KW - Biomass burning aerosol tracers
KW - Indochina
UR - http://www.scopus.com/inward/record.url?scp=84882635835&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2012.06.056
DO - 10.1016/j.atmosenv.2012.06.056
M3 - 期刊論文
AN - SCOPUS:84882635835
SN - 1352-2310
VL - 78
SP - 72
EP - 81
JO - Atmospheric Environment
JF - Atmospheric Environment
ER -