Incremental effect of festive biomass burning on wintertime PM₁₀ in Brahmaputra Valley of Northeast India

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• 作者：Pratibha Deka ; Raza Rafiqul Hoque ; ^{rrh@tezu.ernet.in" class="auth_mail}
• 关键词：PM10 ; Meji ; Festive biomass burning ; Carbon ; Bromine ; MBIE
• 刊名：Atmospheric Research
• 出版年：15 June, 2014
• 年：2014
• 卷：143
• 期：Complete
• 页码：380-391
• 全文大小：1764 K

文摘

PM₁₀ concentration was monitored at a receptor site in the Brahmaputra Valley during a unique, local, episodic festive biomass burning called meji burning. Mean mass concentration of PM₁₀ during monitoring was found to be 149 卤 45 渭g m^鈭?#xA0;3 with maximum and minimum concentrations of 293 渭g m^鈭?#xA0;3 and 93 渭g m^鈭?#xA0;3 respectively. Elemental analysis by Energy Dispersive X-ray Spectrometer (EDX) revealed high carbonaceous and Br content in PM₁₀ samples. Particulate carbon showed high significant correlation with PM₁₀ and dominance in samples taken during night time. Back trajectory analysis supported long range transport of carbonaceous aerosol from the Indo-Gangetic Plain (IGP) to the region under study. Prevailing meteorology - thermal inversion and low mixing heights - was found to have a strong influence on PM₁₀ levels in the post festive burning period. Enrichment factors of several elements ranged above thousand which indicated a strong influence of anthropogenic activities and input of aged particulates driven from long distance. Incremental effect of meji burning, which we coined as Meji Burning Induced Enrichments (MBIEs), was calculated. MBIE values supported incremental effects explicitly.