Microwave Limb Sounder (MLS) observations of biomass burning products in the stratosphere from Canadian forest fires in August 2017
نویسندگان
چکیده
Abstract. Forest fires in British Columbia August 2017 caused a pyrocumulonimbus event that injected polluted air mass into the lower stratosphere. The Microwave Limb Sounder (MLS) on Aura satellite first observed 14 and continued to observe it for 60 d (100 water vapour). We estimate of CO stratosphere be 2400 Gg. Events which fire injects its burning products directly are rare: this is third four such events 16 years since launch Aura, second largest events, only one Northern Hemisphere. other three occurred Australia December 2006, February 2009 from 2019 January 2020. Unlike 2006 but like 2019–2020 event, described here had clearly elevated vapour content: between 2.5 5 times greater than surrounding atmosphere. describe evolution mass, showing rose an altitude about 24 km (31 hPa) divided several identifiable parts. In addition H2O, we enhanced amounts HCN, CH3CN, CH3Cl CH3OH with mixing ratios range expected variety measurements biomass plumes. use back trajectories plume-dispersion modelling demonstrate pollutants by MLS originated fires, likeliest source being at 53.2∘ N, 121.8∘ W 05:20 UTC 13 2017.
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ژورنال
عنوان ژورنال: Atmospheric Chemistry and Physics
سال: 2021
ISSN: ['1680-7316', '1680-7324']
DOI: https://doi.org/10.5194/acp-21-16645-2021