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dc.contributor.authorMellado González, Juan Pedro
dc.contributor.authorStevens, Bjorn
dc.contributor.authorSchmidt, Heiko
dc.contributor.authorPeters, Norbert
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.date.accessioned2020-06-15T10:30:39Z
dc.date.available2020-06-15T10:30:39Z
dc.date.issued2009-04-28
dc.identifier.citationMellado, J. P. [et al.]. Buoyancy reversal in cloud-top mixing layers. "Quarterly journal of the Royal Meteorological Society", 28 Abril 2009, vol. 135, p. 963-978.
dc.identifier.issn0035-9009
dc.identifier.urihttp://hdl.handle.net/2117/190714
dc.description.abstractA theoretical and numerical small-scale study of the evaporative cooling phenomenon that might appear in the stratocumulus-topped boundary layers is presented. An ideal configuration of a cloud-top mixing layer is considered as defined by two non-turbulent horizontal layers, stably stratified and with buoyancy reversal within a certain range of mixture fractions due to the evaporative cooling. Linear stability analysis of the shear-free configuration is employed to provide a new interpretation of the buoyancy reversal parameter, namely in terms of a time-scale ratio between the stable and the unstable modes of the system. An incompressible high-order numerical algorithm to perform direct numerical simulation of the configuration is described and two-dimensional simulations of single-mode perturbations are presented. These simulations confirm the role of the different parameters identified in the linear stability analysis and show that convoluted flow patterns can be generated by the evaporative cooling even for the low levels of buoyancy reversal found in stratocumulus clouds. They also show that there is no enhancement of turbulent entrainment of upper-layer fluid in the shear-free configuration, and turbulent mixing enhancement by the evaporative cooling is restricted to the lower layer.
dc.format.extent16 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshHeat--Convection, Natural
dc.subject.lcshTurbulence
dc.subject.lcshFluid dynamics
dc.subject.lcshStratos
dc.subject.otherBuoyancy reversal instability
dc.subject.otherStratocumulus
dc.subject.otherFree convection
dc.subject.otherFree turbulent flows
dc.titleBuoyancy reversal in cloud-top mixing layers
dc.typeArticle
dc.subject.lemacDinàmica de fluids
dc.subject.lemacConvecció (Meteorologia)
dc.subject.lemacNúvols
dc.identifier.doi10.1002/qj.417
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://rmets.onlinelibrary.wiley.com/doi/abs/10.1002/qj.417
dc.rights.accessOpen Access
local.identifier.drac27658036
dc.description.versionPostprint (published version)
local.citation.authorMellado, J. P.; Stevens, B.; Schmidt, H.; Peters, N.
local.citation.publicationNameQuarterly journal of the Royal Meteorological Society
local.citation.volume135
local.citation.startingPage963
local.citation.endingPage978


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