2014
DOI: 10.1175/jas-d-13-0114.1
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Factors Controlling Rapid Stratocumulus Cloud Thinning

Abstract: The relationship between the inversion stability and the liquid water path (LWP) tendency of a vertically well-mixed, adiabatic stratocumulus cloud layer is investigated in this study through the analysis of the budget equation for the LWP. The LWP budget is mainly determined by the turbulent fluxes of heat and moisture at the top and the base of the cloud layer, as well as by the source terms due to radiation and precipitation. Through substitution of the inversion stability parameter k into the budget equati… Show more

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Cited by 46 publications
(30 citation statements)
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“…In the classical cases and in FTDH3, the decrease in ⟨LWP⟩ is accompanied by a decrease in cc. Similar trends are seen in previously published LES studies of classical MSc, where both LWP and cc decrease with an increase in when > * (usually * > 0.2; e.g., Lock, 2009;Noda et al, 2013;Sandu & Stevens, 2011;Xiao et al, 2011;van der Dussen et al, 2014). We note that in C3, C4, and C5 (with increasingly dry free-tropospheric air) is smaller than 0.2, but MSc breakup still occurs in these cases.…”
Section: Effects Of the Ctei Parametersupporting
confidence: 92%
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“…In the classical cases and in FTDH3, the decrease in ⟨LWP⟩ is accompanied by a decrease in cc. Similar trends are seen in previously published LES studies of classical MSc, where both LWP and cc decrease with an increase in when > * (usually * > 0.2; e.g., Lock, 2009;Noda et al, 2013;Sandu & Stevens, 2011;Xiao et al, 2011;van der Dussen et al, 2014). We note that in C3, C4, and C5 (with increasingly dry free-tropospheric air) is smaller than 0.2, but MSc breakup still occurs in these cases.…”
Section: Effects Of the Ctei Parametersupporting
confidence: 92%
“…In general, the LWP is controlled by both the thermodynamics of the ambient air and the cloud-scale dynamics (Petty, 2006). As shown by van der Dussen et al (2014), there are five main physical processes that contribute to changes in the LWP: entrainment, subsidence, radiation, cloud-base turbulent fluxes, and precipitation. We use the LWP budget equation developed by van der Dussen et al (2014) and van der Dussen et al (2016) to quantify the contributions of individual physical processes to the LWP tendency:…”
Section: 1029/2018ms001295mentioning
confidence: 99%
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“…Henceforth, the subscript z i next to a variable indicates that the variable is evaluated at z = z i . Once a parameterization for w e in terms of large-scale properties is available, we can close an integral representation of the PBL (e.g., Lilly 1968, Turton & Nicholls 1987, Stevens 2006, and we can evaluate the response of cloud cover and other important properties to changes in synoptic-scale and mesoscale conditions (e.g., Bretherton & Wyant 1997, Caldwell et al 2013, van der Dussen et al 2014). An analytical expression to calculate w e can be derived from the integral analysis of a control volume extending from z = z i upward (see Figure 2).…”
Section: Scope: the Fluid Mechanics Of Cloud-top Boundariesmentioning
confidence: 99%
“…Another open question is, What is the most convenient set of thermodynamic parameters, e.g., {D, χ s } or {κ, β q ,0 } (see Section 5.1)? In particular, it would be helpful to learn whether the dependence of w e on the thermodynamic parameters can be well represented in terms of just one parameter instead of two, like in terms of D/χ s + 1 (e.g., de Lozar & Mellado 2015a), or in terms of κ, which has often been used to parameterize not only w e , but also cloud thinning and cloud cover (e.g., Moeng 2000, Yamaguchi & Randall 2008, Lock 2009, Sandu & Stevens 2011, Xiao et al 2011, van der Dussen et al 2014. Moreover, the effect of condensational growth by radiative cooling needs to be better quantified, and this effect introduces one more thermodynamic parameter, for example, ψ s , which defines the saturation line, ψ −1 s ψ + χ −1 s χ = 1 (see Figure 4), and the fraction of radiative cooling affecting the enthalpy but not the buoyancy, β q ,0 ψ −1 s (see Equation 19).…”
Section: To Account For This Effect In Equation 18]mentioning
confidence: 99%