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DOI	10.5194/acp-20-29-2020
	Modelling the relationship between liquid water content and cloud droplet number concentration observed in low clouds in the summer Arctic and its radiative effects
	Dionne J.; Von Salzen K.; Cole J.; Mahmood R.; Richard Leaitch W.; Lesins G.; Folkins I.; Chang R.Y.-W.
发表日期	2020
ISSN	1680-7316
起始页码	29
结束页码	43
卷号	20 期号:1
英文摘要	Low clouds persist in the summer Arctic with important consequences for the radiation budget. In this study, we simulate the linear relationship between liquid water content (LWC) and cloud droplet number concentration (CDNC) observed during an aircraft campaign based out of Resolute Bay, Canada, conducted as part of the Network on Climate and Aerosols: Addressing Key Uncertainties in Remote Canadian Environments study in July 2014. Using a singlecolumn model, we find that autoconversion can explain the observed linear relationship between LWC and CDNC. Of the three autoconversion schemes we examined, the scheme using continuous drizzle (Khairoutdinov and Kogan, 2000) appears to best reproduce the observed linearity in the tenuous cloud regime (Mauritsen et al., 2011), while a scheme with a threshold for rain (Liu and Daum, 2004) best reproduces the linearity at higher CDNC. An offline version of the radiative transfer model used in the Canadian Atmospheric Model version 4.3 is used to compare the radiative effects of the modelled and observed clouds. We find that there is no significant difference in the upward longwave cloud radiative effect at the top of the atmosphere from the three autoconversion schemes (p = 0.05) but that all three schemes differ at p = 0.05 from the calculations based on observations. In contrast, the downward longwave and shortwave cloud radiative effect at the surface for the Wood (2005b) and Khairoutdinov and Kogan (2000) schemes do not differ significantly (p = 0.05) from the observation-based radiative calculations, while the Liu and Daum (2004) scheme differs significantly from the observation-based calculation for the downward shortwave but not the downward longwave fluxes. © Author(s) 2020.
语种	英语
scopus关键词	atmospheric modeling; cloud droplet; concentration (composition); radiation budget; radiative transfer; summer; water content; Arctic; Canada; Cornwallis Island; Nunavut; Queen Elizabeth Islands; Resolute Bay
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/141637
作者单位	Physics and Atmospheric Science Department, Dalhousie University, Halifax, NS, Canada; Climate Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, ON, Canada; School of Earth and Ocean Sciences, University of VictoriaVIC, Canada; Earth, Ocean, and Atmospheric Sciences Department, University of British Columbia, Vancouver, BC, Canada; Barcelona Supercomputing Center, Barcelona, Spain
推荐引用方式 GB/T 7714	Dionne J.,Von Salzen K.,Cole J.,et al. Modelling the relationship between liquid water content and cloud droplet number concentration observed in low clouds in the summer Arctic and its radiative effects[J],2020,20(1).
APA	Dionne J..,Von Salzen K..,Cole J..,Mahmood R..,Richard Leaitch W..,...&Chang R.Y.-W..(2020).Modelling the relationship between liquid water content and cloud droplet number concentration observed in low clouds in the summer Arctic and its radiative effects.Atmospheric Chemistry and Physics,20(1).
MLA	Dionne J.,et al."Modelling the relationship between liquid water content and cloud droplet number concentration observed in low clouds in the summer Arctic and its radiative effects".Atmospheric Chemistry and Physics 20.1(2020).