The study analysed spatio-temporal distribution of fire radiative power (FRP) and estimates of trace gases [volatile organic compounds (VOCs) and nitrogen oxides (NO x )] along with their reactivity during biomass burning period of March (2003–2017) over the northeast region (NER), India. Reanalysis data of FRP along with emission rates of trace gases have been retrieved from Global Fire Assimilation System. Results showed that average FRP was estimated to be 0.37 Wm −2 with the highest value in Mizoram (0.16 Wm −2 ) among 7-states of the study region. Temporally, relatively higher FRP occurred during the year of 2006 and 2010 while lowest in 2017. FRP-based VOCs and NO x emission estimates were 431 and 69.5 mg/m 2 /day, respectively which are consistent with observed FRP. Among different groups of VOCs, oxygenated species were the largest group (~56%) estimated followed by alkenes, alkanes, aromatics, and biogenic. Photochemical reactivities of VOCs were estimated using propylene-equivalent and maximum incremental reactivity methods which showed oxygenated species had the highest contributions in chemical reactivity. Based on the MIR scale, the top ten leading contributor species for ozone (O 3 ) formation were in descending order of formaldehyde, acetaldehyde, ethene, propene, toluene, butane, isoprene, methanol, pentene, and hexane which accounted for approximately 97% of total ozone formation. We also examined the ozone formation regime using VOCs/NO x ratios which indicated that O3 formation was likely to be VOC-sensitive over NER. Our results could be used for the understanding of FRP-based trace gas emissions during biomass burning and to establish effective preventive measures for reduction in O 3 pollution.

中文翻译：

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印度东北部生物质燃烧期间（2003-2017 年）微量气体（VOC 和 NOx）的排放估算及其反应性

该研究分析了火辐射功率 (FRP) 的时空分布和微量气体 [挥发性有机化合物 (VOC) 和氮氧化物 (NO x )] 的时空分布及其在 3 月（2003-2017 年）生物质燃烧期间的反应性东北地区（NER），印度。FRP 的再分析数据以及痕量气体的排放率已从全球火灾同化系统中检索到。结果表明，平均 FRP 估计为 0.37 Wm -2 ，其中米佐拉姆邦的最高值 (0.16 Wm -2 ) 在研究区域的 7 个州中。从时间上看，2006 年和 2010 年 FRP 相对较高，而 2017 年最低。基于 FRP 的 VOCs 和 NO x 排放估计分别为 431 和 69.5 mg/m 2 /day，与观察到的 FRP 一致。在不同的 VOCs 组中，含氧物种是估计的最大组别 (~56%)，其次是烯烃、烷烃、芳烃和生物。使用丙烯当量和最大增量反应性方法估计 VOC 的光化学反应性，表明含氧物质对化学反应性的贡献最高。根据MIR标度，臭氧（O 3 ）形成的前十位主要贡献物种依次为甲醛、乙醛、乙烯、丙烯、甲苯、丁烷、异戊二烯、甲醇、戊烯和己烷，约占97%臭氧形成总量。我们还使用 VOCs/NO x 比率检查了臭氧形成机制，这表明 O3 的形成可能对 NER 的 VOC 敏感。