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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	16807316
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.
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
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132327
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]. Atmospheric Chemistry and Physics,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.,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".20.1(2020).