Deconvolution of boundary layer depth and aerosol constraints on cloud water path in subtropical stratocumulus decks
TL;DR: In this article, the LWP adjustment due to aerosol-cloud interactions in marine stratocumulus remains a considerable source of uncertainty for climate sensitivity estimates, and the authors use the susceptibility framework to quantify the potential change in liquid water path (LWP) adjustment with boundary layer (BL) depth.
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Abstract: . 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.
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References
An emulator approach to stratocumulus susceptibility
Franziska Glassmeier,Franziska Glassmeier,Fabian Hoffmann,Fabian Hoffmann,Jill S. Johnson,Takanobu Yamaguchi,Takanobu Yamaguchi,Kenneth S. Carslaw,Graham Feingold +8 more
TL;DR: The authors derived the dependence of cloud fraction CF, cloud albedo AC, and the relative cloud radiative effect rCRE = CF ⋅ A C on cloud droplet number N and liquid water path LWP from 159 large-eddy simulations of nocturnal stratocumulus.
Cloud Adiabaticity and Its Relationship to Marine Stratocumulus Characteristics Over the Northeast Pacific Ocean
Rachel A. Braun,Hossein Dadashazar,Alexander B. MacDonald,Ewan Crosbie,Haflidi Jonsson,Roy K. Woods,Richard C. Flagan,John H. Seinfeld,Armin Sorooshian +8 more
TL;DR: In this paper, the authors examined the relationship between α and the vertical profiles and cloud top characteristics for both the cloud droplet-only spectrum and full spectrum (cloud and rain droplets) for 86 cloud events over the Northeast Pacific Ocean based on data collected during four separate summertime airborne campaigns.
43
How important is the vertical structure for the representation of aerosol impacts on the diurnal cycle of marine stratocumulus
TL;DR: In this paper, large-eddy simulations are performed to examine the impact of hygroscopic aerosols on the diurnal cycle of marine stratocumulus clouds, under varying meteo-rological forcing conditions.
Factors Controlling Cloud Albedo in Marine Subtropical Stratocumulus Regions in Climate Models and Satellite Observations
TL;DR: In this paper, the radiative properties of five subtropical marine stratocumulus cloud regions, on monthly mean scale, were examined through examination of the relation between total albedo and cloud fraction, and its variability and relation to other parameters.
32
Automatic detection of ship tracks in ATSR-2 satellite imagery
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