posted on 2021-12-13, 18:45authored byMingchen Ma, Yang Gao, Aijun Ding, Hang Su, Hong Liao, Shuxiao Wang, Xuemei Wang, Bin Zhao, Shaoqing Zhang, Pingqing Fu, Alex B. Guenther, Minghuai Wang, Shenshen Li, Biwu Chu, Xiaohong Yao, Huiwang Gao
Biogenic
volatile organic compound (BVOC) emissions have long been
known to play vital roles in modulating the formation of ozone and
secondary organic aerosols (SOAs). While early studies have evaluated
their impact globally or regionally, the BVOC emissions emitted from
urban green spaces (denoted as U-BVOC emissions) have been largely
ignored primarily due to the failure of low-resolution land cover
in resolving such processes, but also because their important contribution
to urban BVOCs was previously unrecognized. In this study, by utilizing
a recently released high-resolution land cover dataset, we develop
the first set of emission inventories of U-BVOCs in China at spatial
resolutions as high as 1 km. This new dataset resolved densely distributed
U-BVOCs in urban core areas. The U-BVOC emissions in megacities could
account for a large fraction of total BVOC emissions, and the good
agreement of the interannual variations between the U-BVOC emissions
and ozone concentrations over certain regions stresses their potentially
crucial role in influencing ozone variations. The newly constructed
U-BVOC emission inventory is expected to provide an improved dataset
to enable the research community to re-examine the modulation of BVOCs
on the formation of ozone, SOA, and atmospheric chemistry in urban
environments.