气候变化领域集成服务门户(CCPortal): Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks

CCPortal

DOI	10.5194/acp-20-3609-2020
	Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks
	Possner A.; Eastman R.; Bender F.; Glassmeier F.
发表日期	2020
ISSN	16807316
起始页码	3609
结束页码	3621
卷号	20 期号:6
英文摘要	The liquid water path (LWP) adjustment due to aerosol-cloud interactions in marine stratocumulus remains a considerable source of uncertainty for climate sensitivity estimates. An unequivocal attribution of LWP adjustments to changes in aerosol concentration from climatology remains difficult due to the considerable covariance between meteorological conditions alongside changes in aerosol concentrations. We utilise the susceptibility framework to quantify the potential change in LWP adjustment with boundary layer (BL) depth in subtropical marine stratocumulus. We show that the LWP susceptibility, i.e. the relative change in LWP scaled by the relative change in cloud droplet number concentration, in marine BLs triples in magnitude from -0.1 to -0.31 as the BL deepens from 300 to 1200 m and deeper. We further find deep BLs to be underrepresented in pollution tracks, process modelling, and in situ studies of aerosol-cloud interactions in marine stratocumulus. Susceptibility estimates based on these approaches are skewed towards shallow BLs of moderate LWP susceptibility. Therefore, extrapolating LWP susceptibility estimates from shallow BLs to the entire cloud climatology may underestimate the true LWP adjustment within subtropical stratocumulus and thus overestimate the effective aerosol radiative forcing in this region. Meanwhile, LWP susceptibility estimates in deep BLs remain poorly constrained. While susceptibility estimates in shallow BLs are found to be consistent with process modelling studies, they overestimate pollution track estimates. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
关键词	aerosol boundary layer climatology cloud droplet cloud water concentration (composition)deconvolution radiative forcing stratocumulus
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/132143
推荐引用方式 GB/T 7714	Possner A.,Eastman R.,Bender F.,et al. Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks[J]. Atmospheric Chemistry and Physics,2020,20(6).
APA	Possner A.,Eastman R.,Bender F.,&Glassmeier F..(2020).Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks.,20(6).
MLA	Possner A.,et al."Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks".20.6(2020).