首页|Seasonal and wildfire biomass burning impact on gas-fuel heated northern European megacity: brown carbon apportionment

Seasonal and wildfire biomass burning impact on gas-fuel heated northern European megacity: brown carbon apportionment

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  • NETL
  • NSTL
  • Elsevier
Biomass burning (BB) has a major impact on air quality and population health, with the brown carbon (BrC) of special concern as an important source of pollution and absorbing incoming radiation. The impact of BB was quantified in an urban area of Moscow, the northern gas-fuel heated European megacity, during warm and cold seasons. Real-time measurements of aerosol optical properties were performed by an aethalometer. Heating and non-heating periods are marked by Absorption Angstrom exponent (AAE) equal 1.1 and 1.2, spring agricultural and summer wildfires by 1.3 and 1.4, respectively. Light absorption babs of 10 f 9 Mm-1 at 880 nm and 29 f 27 Mm-1 at 370 nm was independent on heating activity. No significant seasonal difference was revealed by mass absorption coefficient for black carbon (BC) of 13.5 m2 g-1 and BrC of 0.9 m2 g-1. BC contribution to total absorption dominated in all wavelength ranges and seasons. During heating period, BrC contribution to total absorption at 370 nm (%babsBrC) was 16 f 21 %, lower than in other European and Asian megacities where populations widely burn biomass and coal. It was 24 f 31 % in spring due to agricultural fire impact and increased BB activity because of the population migration out of the city during the May holiday. Ryazan wildfire plumes affected Moscow, with babs(880) and babs(370) increase 1.7 and 2.4 times, respectively, with a high % babsBrC of 37 +/- 59 %, and strong BrC absorption capacity in both day and nighttime. The relative absorption forcing of BrC compared to BC was estimated to range between 36.2 +/- 1.1 % and 29.8 +/- 2.7 % in ultraviolet and visible radiation range, respectively. Backward trajectory cluster and concentration weighted trajectory analyses revealed the regional origin of BB sources, coinciding with areas of observed wildfires. Collocated 12 h sampling and chemical composition analyses of BB tracers (levoglucosan and K+) identified the emission sources by significant correlations with BrC absorption. Four factors of BrC apportionment were identified via positive matrix factorization, showing contributions from fossil fuel combustion and secondary organic (82 %), and BB (18 %). As a result, regional population activity and spring and summer wildfires highlighted the uniqueness of Moscow as the northern gas-fuel heated megacity for BB impact studies in Europe and Asia.

Megacitylight absorptionbiomass burningbrown carbonsourcesFINE-PARTICLE EMISSIONSSOLUBLE ORGANIC-CARBONLARGE-SCALE WILDFIRESBLACK-CARBONAIR-QUALITYOPTICAL-PROPERTIESCHEMICAL-CHARACTERIZATIONPARTICULATE MATTERAEROSOL-ABSORPTIONLIGHT-ABSORPTION

Popovicheva, Olga、Chichaeva, Marina、Kovach, Roman、Tsai, Ying I.、Diapouli, Evangelia、Kasimov, Nikolay

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Lomonosov Moscow State Univ

Chia Nan University of Pharmacy and Science Department of Environmental Engineering and Science

NCSR Demokritos

2025

10.1016/j.atmosenv.2025.121325

Atmospheric environment

Atmospheric environment

SCI
ISSN：1352-2310
年,卷(期)：2025.357(Sep.)
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