Observed size-dependent effect of the marine air on aerosols hygroscopicity at a coastal site of Shenzhen, China

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric Research Pub Date : 2024-11-30 DOI:10.1016/j.atmosres.2024.107830
SongJian Zou , Lu Chen , Honghao Xu , Rou Zhang , Mengyu Liu , Guiquan Liu , Jianhuai Ye , Honglong Yang , Hao Wu , Yinshan Yang , Fang Zhang
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Abstract

Aerosols hygroscopicity and CCN activity in coastal area is influenced by continental-marine air interaction, probably exerting a profound climate effect. In this study, combining field measurement at a coastal site in Shenzhen with a back trajectory model, we have identified an externally-mixed sea salt mode in accumulated particles, where the hygroscopic parameter (κ) ranges from 0.97 to 1.14. The sea salt mode, however, was not observed for ultrafine particles in nucleation/Aitken modes. Nonetheless, the.
hygroscopicity of the particles across all sizes under the influence of marine air were remarkably enhanced by 49 %–64 % compared to the continental air masses. Moreover, we reveal a considerable transport of marine-sourced sulfate aerosols when the marine air dominated, explaining the enhanced hygroscopicity. We attribute the absence of externally-mixed sea salt in nucleation/Aitken modes to that the ultrafine marine-sourced aerosols are generally with lower quantity and tend to be collided and internally-mixed during transport. We finally made a global review using observations at 21 sites, deriving the κ of 0.21–0.25, 0.23–0.32, and 0.51–0.60 categorized by continental, coastal, and oceanic respectively. Our study illustrates the size-dependent effect of the continental-marine air interaction on particles hygroscopicity and provides observational basis for model simulation.

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在中国深圳沿海观测到的海洋空气对气溶胶吸湿性的大小依赖效应
沿海地区气溶胶吸湿性和CCN活动受陆海空气相互作用的影响,可能产生深远的气候效应。本研究结合深圳沿海地区的现场测量和反向轨迹模型,确定了沉积颗粒的外混合海盐模式,其吸湿参数(κ)范围为0.97 ~ 1.14。然而,超细颗粒在成核/艾特肯模式下没有观察到海盐模式。尽管如此,。
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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