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@ARTICLE{Tan:857245,
author = {Tan, Zhaofeng and Rohrer, Franz and Lu, Keding and Ma,
Xuefei and Bohn, Birger and Broch, Sebastian and Dong,
Huabin and Fuchs, Hendrik and Gkatzelis, Georgios I. and
Hofzumahaus, Andreas and Holland, Frank and Li, Xin and Liu,
Ying and Liu, Yuhan and Novelli, Anna and Shao, Min and
Wang, Haichao and Wu, Yusheng and Zeng, Limin and Hu, Min
and Kiendler-Scharr, Astrid and Wahner, Andreas and Zhang,
Yuanhang},
title = {{W}intertime photochemistry in {B}eijing: observations of
{RO}x radical concentrations in the {N}orth {C}hina {P}lain
during the {BEST}-{ONE} campaign},
journal = {Atmospheric chemistry and physics},
volume = {18},
number = {16},
issn = {1680-7324},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2018-06475},
pages = {12391 - 12411},
year = {2018},
abstract = {The first wintertime in situ measurements of hydroxyl (OH),
hydroperoxy (HO2) and organic peroxy (RO2) radicals
(ROx = OH + HO2 + RO2) in combination with
observations of total reactivity of OH radicals, kOH in
Beijing are presented. The field campaign "Beijing winter
finE particle STudy – Oxidation, Nucleation and light
Extinctions" (BEST-ONE) was conducted at the suburban site
Huairou near Beijing from January to March 2016. It aimed to
understand oxidative capacity during wintertime and to
elucidate the secondary pollutants' formation mechanism in
the North China Plain (NCP). OH radical concentrations at
noontime ranged from 2.4×106 cm−3 in severely polluted
air (kOH ∼ 27 s−1) to 3.6×106 cm−3 in
relatively clean air (kOH ∼ 5 s−1). These values
are nearly 2-fold larger than OH concentrations observed in
previous winter campaigns in Birmingham, Tokyo, and New York
City. During this campaign, the total primary production
rate of ROx radicals was dominated by the photolysis of
nitrous acid accounting for $46\%$ of the identified primary
production pathways for ROx radicals. Other important
radical sources were alkene ozonolysis $(28\%)$ and
photolysis of oxygenated organic compounds $(24\%).$ A box
model was used to simulate the OH, HO2 and RO2
concentrations based on the observations of their long-lived
precursors. The model was capable of reproducing the
observed diurnal variation of the OH and peroxy radicals
during clean days with a factor of 1.5. However, it largely
underestimated HO2 and RO2 concentrations by factors up to 5
during pollution episodes. The HO2 and RO2
observed-to-modeled ratios increased with increasing NO
concentrations, indicating a deficit in our understanding of
the gas-phase chemistry in the high NOx regime. The OH
concentrations observed in the presence of large OH
reactivities indicate that atmospheric trace gas oxidation
by photochemical processes can be highly effective even
during wintertime, thereby facilitating the vigorous
formation of secondary pollutants.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {243 - Tropospheric trace substances and their
transformation processes (POF3-243)},
pid = {G:(DE-HGF)POF3-243},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000442775100004},
doi = {10.5194/acp-18-12391-2018},
url = {https://juser.fz-juelich.de/record/857245},
}