Enhanced summertime ozone and SOA from biogenic volatile organic compound (BVOC) emissions due to vegetation biomass variability during 1981–2018 in China
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Published:2022-02-21
Issue:4
Volume:22
Page:2351-2364
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Cao Jing,Situ Shuping,Hao Yufang,Xie Shaodong,Li Lingyu
Abstract
Abstract. Coordinated control of fine particulate matter
(PM2.5) and ozone (O3) has become a new and urgent issue for
China's air pollution control. Biogenic volatile organic compounds (BVOCs)
are important precursors of O3 and secondary organic aerosol (SOA)
formation. China experienced a rapid increase in BVOC emissions as a result
of increased vegetation biomass. We applied WRF-Chem3.8 coupling with
MEGAN2.1 to conduct long-term simulations for impacts of BVOC emissions on
O3 and SOA during 1981–2018, using the emission factors extrapolated
by localized emission rates and annual vegetation biomass. In summer
2018, BVOC emissions were 9.91 Tg (in June), which led to an average
increase of 8.6 ppb (16.75 % of the total) in daily maximum 8 h (MDA8)
O3 concentration and 0.84 µg m−3 (73.15 % of the total) in
SOA over China. The highest contribution to O3 is concentrated in the
Great Khingan Mountains, Qinling Mountains, and most southern regions while
in southern areas for SOA. Isoprene has the greatest contribution to O3,
while monoterpene has the largest SOA production. BVOC emissions have
distinguished impacts in different regions. The Chengdu–Chongqing (CC) region
has the highest O3 and SOA generated by BVOCs, while
the Beijing–Tianjin–Hebei (BTH) region has the lowest. From 1981 to 2018, the
interannual variation of BVOC emissions caused by increasing leaf biomass
resulted in O3 concentration increasing by 7.38 % at an average rate
of 0.11 ppb yr−1 and SOA increasing by 39.30 % at an average rate of
0.008 µg m−3 yr−1. Due to the different changing trends of
leaf biomass by region and vegetation type, O3 and SOA show different
interannual variations. The Fenwei Plain (FWP), Yangtze River Delta (YRD), and
Pearl River Delta (PRD) regions have the most rapid O3 increment, while
the increasing rate of SOA in CC is the highest. BTH has the smallest
enhancement in O3 and SOA concentration. This study will help to
recognize the impact of historical BVOC emissions on O3 and SOA and
further provide a reliable scientific basis for the precise prevention and
control of air pollution in China.
Funder
National Natural Science Foundation of China National Outstanding Youth Science Fund Project of National Natural Science Foundation of China Science and Technology Support Plan for Youth Innovation of Colleges and Universities of Shandong Province of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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