气候变化领域集成服务门户(CCPortal): Aerosol activation characteristics and prediction at the central European ACTRIS research station of Melpitz, Germany

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DOI	10.5194/acp-22-15943-2022
	Aerosol activation characteristics and prediction at the central European ACTRIS research station of Melpitz, Germany
	Wang, Yuan; Henning, Silvia; Poulain, Laurent; Lu, Chunsong; Stratmann, Frank; Wang, Yuying; Niu, Shengjie; Poehlker, Mira L.; Herrmann, Hartmut; Wiedensohler, Alfred
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	15943
结束页码	15962
卷号	22 期号:24 页码:20
英文摘要	Understanding aerosol particle activation is essential for evaluating aerosol indirect effects (AIEs) on climate. Long-term measurements of aerosol particle activation help to understand the AIEs and narrow down the uncertainties of AIEs simulation. However, they are still scarce. In this study, more than 4 years of comprehensive aerosol measurements were utilized at the central European research station of Melpitz, Germany, to gain insight into the aerosol particle activation and provide recommendations on improving the prediction of number concentration of cloud condensation nuclei (CCN, N-CCN). (1) The overall CCN activation characteristics at Melpitz are provided. As supersaturation (SS) increases from 0.1 % to 0.7 %, the median NCCN increases from 399 to 2144 cm(-3), which represents 10 % to 48 % of the total particle number concentration with a diameter range of 10-800 nm, while the median hygroscopicity factor (kappa) and critical diameter (D-c) decrease from 0.27 to 0.19 and from 176 to 54 nm, respectively. (2) Aerosol particle activation is highly variable across seasons, especially at low-SS conditions. At SS = 0.1 %, the median NCCN and activation ratio (AR) in winter are 1.6 and 2.3 times higher than the summer values, respectively. (3) Both kappa and the mixing state are size-dependent. As the particle diameter (D-p) increases, kappa increases at D-p of similar to 40 to 100 nm and almost stays constant at D-p of 100 to 200 nm, whereas the degree of the external mixture keeps decreasing at D-p of similar to 40 to 200 nm. The relationships of kappa vs. D-p and degree of mixing vs. Dp were both fitted well by a power-law function. (4) Size-resolved kappa improves the N-CCN prediction. We recommend applying the kappa-D-p power-law fit for N-CCN prediction at Melpitz, which performs better than using the constant kappa of 0.3 and the kappa derived from particle chemical compositions and much better than using the N-CCN (AR) vs. SS relationships. The kappa-D-p power-law fit measured at Melpitz could be applied to predict N-CCN for other rural regions. For the purpose of improving the prediction of N-CCN, longterm monodisperse CCN measurements are still needed to obtain the kappa-D-p relationships for different regions and their seasonal variations.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000900231200001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273249
作者单位	Leibniz Institut fur Tropospharenforschung (TROPOS); Nanjing University of Information Science & Technology; Lanzhou University; Nanjing Tech University
推荐引用方式 GB/T 7714	Wang, Yuan,Henning, Silvia,Poulain, Laurent,et al. Aerosol activation characteristics and prediction at the central European ACTRIS research station of Melpitz, Germany[J],2022,22(24):20.
APA	Wang, Yuan.,Henning, Silvia.,Poulain, Laurent.,Lu, Chunsong.,Stratmann, Frank.,...&Wiedensohler, Alfred.(2022).Aerosol activation characteristics and prediction at the central European ACTRIS research station of Melpitz, Germany.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(24),20.
MLA	Wang, Yuan,et al."Aerosol activation characteristics and prediction at the central European ACTRIS research station of Melpitz, Germany".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.24(2022):20.