Evaluation of the contribution of new particle formation to cloud droplet number concentration in the urban atmosphere
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Published:2021-09-27
Issue:18
Volume:21
Page:14293-14308
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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:
Jiang Sihui, Zhang FangORCID, Ren Jingye, Chen Lu, Yan XingORCID, Liu Jieyao, Sun YeleORCID, Li ZhanqingORCID
Abstract
Abstract. The effect of new particle formation (NPF) on cloud condensation nuclei (CCN)
varies widely in diverse environments. CCN or cloud droplets from NPF
sources remain highly uncertain in the urban atmosphere; they are greatly
affected by the high background aerosols and frequent local emissions. In
this study, we quantified the effect of NPF on cloud droplet number
concentration (CDNC, or Nd) at typical updraft velocities (V) in clouds
based on field observations on 25 May–18 June 2017 in urban Beijing. We
show that NPF increases the Nd by 32 %–40 % at V=0.3–3 m s−1
during the studied period. The Nd is reduced by 11.8 ± 5.0 % at
V=3 m s−1 and 19.0 ± 4.5 % at V=0.3 m s−1 compared to
that calculated from constant supersaturations due to the water vapor
competition effect, which suppresses the cloud droplet formation by decreasing
the environmental maximum supersaturation (Smax). The effect of water
vapor competition becomes smaller at larger V that can provide more
sufficient water vapor. However, under extremely high aerosol particle
number concentrations, the effect of water vapor competition becomes more
pronounced. As a result, although a larger increase of CCN-sized particles by
NPF events is derived on clean NPF days when the number concentration of
preexisting background aerosol particles is very low, no large discrepancy
is presented in the enhancement of Nd by NPF between clean and
polluted NPF days. We finally reveal a considerable impact of the primary
sources on the evaluation of the contribution of NPF to CCN number
concentration (NCCN) and Nd
based on a case study. Our study highlights the importance of full
consideration of both the environmental meteorological conditions and
multiple sources (i.e., secondary and primary) to evaluate the effect of NPF on
clouds and the associated climate effects in polluted regions.
Funder
National Key Research and Development Program of China National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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