气候变化领域集成服务门户(CCPortal): Sources and characteristics of size-resolved particulate organic acids and methanesulfonate in a coastal megacity: Manila; Philippines

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DOI	10.5194/acp-20-15907-2020
	Sources and characteristics of size-resolved particulate organic acids and methanesulfonate in a coastal megacity: Manila; Philippines
	Stahl C.; Templonuevo Cruz M.; Angela Banãga P.; Betito G.; Braun R.A.; Azadi Aghdam M.; Obiminda Cambaliza M.; Rose Lorenzo G.; MacDonald A.B.; Hilario M.RicardoA.; Corazon Pabroa P.; Robin Yee J.; Bernard Simpas J.; Sorooshian A.
发表日期	2020
ISSN	1680-7316
起始页码	15907
结束页码	15935
卷号	20 期号:24
英文摘要	A 16-month (July 2018-October 2019) dataset of size-resolved aerosol composition is used to examine the sources and characteristics of five organic acids (oxalate, succinate, adipate, maleate, phthalate) and methanesulfonate (MSA) in Metro Manila, Philippines. As one of the most polluted megacities globally, Metro Manila offers a view of how diverse sources and meteorology impact the relative amounts and size distributions of these species. A total of 66 sample sets were collected with a Micro-Orifice Uniform Deposit Impactor (MOUDI), of which 54 sets were analyzed for composition. Organic acids and MSA surprisingly were less abundant than in other global regions that are also densely populated. The combined species accounted for an average of 0.80 ± 0.66 % of total gravimetric mass between 0.056 and 18 μm, still leaving 33.74 % of mass unaccounted for after considering black carbon and water-soluble ions and elements. The unresolved mass is suggested to consist of non-water-soluble metals as well as both water-soluble and non-water-soluble organics. Oxalate was approximately an order of magnitude more abundant than the other five species (149 ± 94 ng m-3 versus others being < 10 ng m-3) across the 0.056-18 μm size range. Both positive matrix factorization (PMF) and correlation analysis are conducted with tracer species to investigate the possible sources of organic acids and MSA. Enhanced biomass burning influence in the 2018 southwest monsoon resulted in especially high levels of submicrometer succinate, MSA, oxalate, and phthalate. Peculiarly, MSA had negligible contributions from marine sources but instead was linked to biomass burning and combustion. Enhanced precipitation during the two monsoon seasons (8 June-4 October 2018 and 14 June-7 October 2019) coincided with a stronger influence from local emissions rather than long-range transport, leading to notable concentration enhancements in both the sub- A nd supermicrometer ranges for some species (e.g., maleate and phthalate). While secondary formation via gas-to-particle conversion is consistent with submicrometer peaks for the organic acids and MSA, several species (i.e., phthalate, adipate, succinate, oxalate) exhibited a prominent peak in the coarse mode, largely owing to their association with crustal emissions (i.e., more alkaline aerosol type) rather than sea salt. Oxalate's strong association with sulfate in the submicrometer mode supports an aqueous-phase formation pathway for the study region. However, high concentrations during periods of low rain and high solar radiation suggest photo-oxidation is an important formation pathway. © 2020 Author(s).
英文关键词	aerosol composition; biomass burning; black carbon; coastal zone; concentration (composition); megacity; organic acid; particle size; size distribution; National Capital Region; Philippines
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168871
作者单位	Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ 85721, United States; Manila Observatory, Quezon City, 1108, Philippines; Institute of Environmental Science and Meteorology, University of the Philippines, Diliman, Quezon City, 1101, Philippines; Department of Physics, School of Science and Engineering, Ateneo de Manila University, Quezon City, 1108, Philippines; Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ 85721, United States; Philippine Nuclear Research Institute, Department of Science and Technology, Commonwealth Avenue, Diliman, Quezon City, 1101, Philippines
推荐引用方式 GB/T 7714	Stahl C.,Templonuevo Cruz M.,Angela Banãga P.,et al. Sources and characteristics of size-resolved particulate organic acids and methanesulfonate in a coastal megacity: Manila; Philippines[J],2020,20(24).
APA	Stahl C..,Templonuevo Cruz M..,Angela Banãga P..,Betito G..,Braun R.A..,...&Sorooshian A..(2020).Sources and characteristics of size-resolved particulate organic acids and methanesulfonate in a coastal megacity: Manila; Philippines.Atmospheric Chemistry and Physics,20(24).
MLA	Stahl C.,et al."Sources and characteristics of size-resolved particulate organic acids and methanesulfonate in a coastal megacity: Manila; Philippines".Atmospheric Chemistry and Physics 20.24(2020).