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Identification of close relationship between atmospheric oxidation and ozone
formation regimes in a photochemically active region
#MMPMID33637263
Zhao K
; Luo H
; Yuan Z
; Xu D
; Du Y
; Zhang S
; Hao Y
; Wu Y
; Huang J
; Wang Y
; Jiang R
J Environ Sci (China)
2021[Apr]; 102
(?): 373-383
PMID33637263
show ga
Understanding ozone (O(3)) formation regime is a prerequisite in formulating an
effective O(3) pollution control strategy. Photochemical indicator is a simple
and direct method in identifying O(3) formation regimes. Most used indicators are
derived from observations, whereas the role of atmospheric oxidation is not in
consideration, which is the core driver of O(3) formation. Thus, it may impact
accuracy in signaling O(3) formation regimes. In this study, an advanced
three-dimensional numerical modeling system was used to investigate the
relationship between atmospheric oxidation and O(3) formation regimes during a
long-lasting O(3) exceedance event in September 2017 over the Pearl River Delta
(PRD) of China. We discovered a clear relationship between atmospheric oxidative
capacity and O(3) formation regime. Over eastern PRD, O(3) formation was mainly
in a NO(x)-limited regime when HO(2)/OH ratio was higher than 11, while in a
VOC-limited regime when the ratio was lower than 9.5. Over central and western
PRD, an HO(2)/OH ratio higher than 5 and lower than 2 was indicative of
NO(x)-limited and VOC-limited regime, respectively. Physical contribution,
including horizontal transport and vertical transport, may pose uncertainties on
the indication of O(3) formation regime by HO(2)/OH ratio. In comparison with
other commonly used photochemical indicators, HO(2)/OH ratio had the best
performance in differentiating O(3) formation regimes. This study highlighted the
necessities in using an atmospheric oxidative capacity-based indicator to infer
O(3) formation regime, and underscored the importance of characterizing behaviors
of radicals to gain insight in atmospheric processes leading to O(3) pollution
over a photochemically active region.
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