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<p>In order to understand the influence of forest fires on one of the critical pollutants impacting air quality over a hilly station, this study was undertaken utilizing integrated observation from in-situ station, satellites and reanalysis data. Black Carbon (BC) surface mass concentration was measured over Mizoram, the southernmost state of North east India (NEI) for the first time during 4th March − 3rd April 2022 under a campaign mode. Mean BC during the study period was 6.18 ± 3.1&#xa0;µg/m<sup>3</sup> that varied between a daily mean of 2.43 ± 0.41&#xa0;µg/m<sup>3</sup> to 12.87 ± 2.12&#xa0;µg/m<sup>3</sup>. Reanalysis data is found as not sufficiently representative for this region as MERRA-2 reanalysis significantly overestimated BC (~ 4 times than the observed mean) over Mizoram during the fire active period while underestimated during other times. The possibilities of long range transport increasing the BC load over Mizoram was found limited during the study period. An average absorption Ångström exponent (AAE) of 1.22 ± 0.1 suggests dominant influence of biomass burning, consistent with flaming combustion of local and regional wood sources. Higher forest fire activity within 250&#xa0;km of the station coincided with increased BC levels and implicated forest fire as dominant BC emission source during this season. CALIPSO Lidar observations detected an elevated smoke layer at 4.5–5&#xa0;km AMSL, indicating fire induced convective activities, which was gradually replaced by dust and polluted dust as the season advanced. This study highlights the importance of long-term in-situ measurements of aerosols over fragile ecosystems like the NEI. </p>

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Impact of forest fire on surface black carbon concentration over Mizoram, North-east India

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Arundhati Kundu,
  • Shyam S. Kundu,
  • Arup Borgohain,
  • Arban S. Youroi,
  • Rahul Mahanta,
  • Mukunda M. Gogoi,
  • S. Suresh Babu,
  • Kasturi Chakraborty

摘要

In order to understand the influence of forest fires on one of the critical pollutants impacting air quality over a hilly station, this study was undertaken utilizing integrated observation from in-situ station, satellites and reanalysis data. Black Carbon (BC) surface mass concentration was measured over Mizoram, the southernmost state of North east India (NEI) for the first time during 4th March − 3rd April 2022 under a campaign mode. Mean BC during the study period was 6.18 ± 3.1 µg/m3 that varied between a daily mean of 2.43 ± 0.41 µg/m3 to 12.87 ± 2.12 µg/m3. Reanalysis data is found as not sufficiently representative for this region as MERRA-2 reanalysis significantly overestimated BC (~ 4 times than the observed mean) over Mizoram during the fire active period while underestimated during other times. The possibilities of long range transport increasing the BC load over Mizoram was found limited during the study period. An average absorption Ångström exponent (AAE) of 1.22 ± 0.1 suggests dominant influence of biomass burning, consistent with flaming combustion of local and regional wood sources. Higher forest fire activity within 250 km of the station coincided with increased BC levels and implicated forest fire as dominant BC emission source during this season. CALIPSO Lidar observations detected an elevated smoke layer at 4.5–5 km AMSL, indicating fire induced convective activities, which was gradually replaced by dust and polluted dust as the season advanced. This study highlights the importance of long-term in-situ measurements of aerosols over fragile ecosystems like the NEI.