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2004: An evaluation of mass flux closures for diurnal cycles of shallow cumulus

by R. A. J. Neggers, A. P. Siebesma, G. Lenderink, A. A. M. Holtslag - Mon. Wea. Rev
"... Three closure methods for the mass flux at cloud base in shallow cumulus convection are critically examined for the difficult case of a diurnal cycle over land. The closure methods are first evaluated against large-eddy simulations (LESs) by diagnosing all parameters appearing in the closure equatio ..."
Abstract - Cited by 9 (4 self) - Add to MetaCart
is then studied by its implementation in an offline single-column model of a regional atmospheric climate model. The LES results show that the boundary layer quasi-equilibrium closure typically overestimates the cloud-base mass flux after cloud onset, due to the neglect of significant moisture and temperature

2010: Evaluating boundary layer–based mass flux closures using cloud–resolving model simulations of deep convection

by Jennifer K. Fletcher, Christopher, S. Bretherton - J. Atmos. Sci
"... High-resolution three-dimensional cloud resolving model simulations of deep cumulus convection under a wide range of large-scale forcings are used to evaluate a mass flux closure based on boundary layer con-vective inhibition (CIN) that has previously been applied in parameterizations of shallow cum ..."
Abstract - Cited by 5 (1 self) - Add to MetaCart
cumulus convec-tion. With minor modifications, it is also found to perform well for deep oceanic and continental cumulus convection, and it matches simulated cloud-base mass flux much better than a closure based only on the boundary layer convective velocity scale. CIN closure maintains an important

unknown title

by Virginie Lorant, Æ Norman, A. Mcfarlane, John F. Scinocca
"... Abstract The present study investigates the sensitivity of the frequency distribution of precipitation rates to the closure employed in the penetrative mass flux cumulus parameterization of Zhang and McFarlane in the Canadian regional climate model (CRCM) and in the Canadian Centre for Climate Model ..."
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in the frequency distribution of precipitation rates and cloud base mass-flux are examined as a function of the parameters that define each closure scheme. The relationship between the frequency distribution of

The string dual of a confining four-dimensional gauge theory

by Joseph Polchinski, Matthew J. Strassler , 2000
"... We study N = 1 gauge theories obtained by adding finite mass terms to N = 4 Yang-Mills theory. The Maldacena dual is nonsingular: in each of the many vacua, there is an extended brane source, arising from Myers’ dielectric effect. The source consists of one or more (p,q) 5-branes. In particular, the ..."
Abstract - Cited by 353 (8 self) - Add to MetaCart
We study N = 1 gauge theories obtained by adding finite mass terms to N = 4 Yang-Mills theory. The Maldacena dual is nonsingular: in each of the many vacua, there is an extended brane source, arising from Myers’ dielectric effect. The source consists of one or more (p,q) 5-branes. In particular

(www.interscience.wiley.com) DOI: 10.1002/qj.105 Variance scaling in shallow-cumulus-topped mixed layers

by R. A. J. Neggers, B. Stevens, J. D. Neelin
"... ABSTRACT: Scaling of thermodynamic variance in shallow-cumulus-topped mixed layers is studied using large-eddy simulation (LES). First, the performance of the top-down scaling (the turbulent flux at mixed-layer top divided by w∗) is evaluated for transient shallow-cumulus convection over land. The r ..."
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of cloud-base transition-layer depth to sub-cloud mixed-layer depth. This puts ‘valve’- or ventilation-type closures for the cloud-base mass flux in the context of the variance budget for the sub-cloud layer. Copyright 2007 Royal Meteorological

The variability of modelled tropical precipitation

by John F. Scinocca, Norman, A. Mcfarlane - J. Atmos. Sci , 2004
"... This paper investigates the temporal properties of tropical precipitation in the Canadian Centre for Climate Modelling and Analysis (CCCma) third-generation atmospheric general circulation model (AGCM3). AGCM3 employs the penetrative mass-flux (PMF) scheme of Zhang and McFarlane (ZM) for the paramet ..."
Abstract - Cited by 23 (1 self) - Add to MetaCart
) for the parameterization of deep cumulus convection. It is found that the temporal variability of the ZM scheme is sensitive to a number of its internal parameters as well to the use of a prognostic, rather than diagnostic, closure condition for the cloud-base mass flux. Sensitivity experiments suggest that the ZM scheme

A Minimal Three-Dimensional Tropical Cyclone Model

by Hongyan Zhu , Roger K. Smith, Wolfgang Ulrich , 2001
"... A minimal 3D numerical model designed for basic studies of tropical cyclone behavior is described. The model is formulated in s coordinates on an f or b plane and has three vertical levels, one characterizing a shallow boundary layer and the other two representing the upper and lower troposphere, ..."
Abstract - Cited by 4 (0 self) - Add to MetaCart
the effects of precipitation-cooled downdrafts. They differ from one another in the closure that determines the cloud-base mass flux. One closure is based on the assumption of boundary layer quasi-equilibrium proposed by Raymond and Emanuel. It is shown that a realistic hurricane-like vortex develops from

Bulk parameterization of air-sea fluxes for Tropical Ocean-Global Atmosphere Coupled-Ocean Atmosphere Response Experiment

by C. W. Fairall, E. F. Bradley, D. P. Rogers, J. B. Edson, G. S. Young S - Journal of Geophysical Research , 1996
"... Abstract. This paper describes the various physical processes relating near-surface atmospheric and oceanographic bulk variables; their relationship to the surface fluxes of momentum, sensible heat, and latent heat; and their expression in a bulk flux algorithm. The algorithm follows the standard Mo ..."
Abstract - Cited by 223 (9 self) - Add to MetaCart
the convective limit. Additionally, we have considered the contribu-tions of the sensible heat carried by precipitation and the requirement hat the net dry mass flux be zero (the so-called Webb correction [Webb et al., 1980]). The algorithm has been tuned to fit measurements made on the R/V Moana Wave

RR flux on Calabi-Yau and partial supersymmetry breaking

by Tomasz R. Taylor, Cumrun Vafa - Phys. Lett. B , 2000
"... We show how turning on Flux for RR (and NS-NS) field strengths on non-compact Calabi-Yau 3-folds can serve as a way to partially break supersymmetry from N = 2 to N = 1 by mass deformation. The freezing of the moduli of Calabi-Yau in the presence of the flux is the familiar phenomenon of freezing of ..."
Abstract - Cited by 194 (9 self) - Add to MetaCart
We show how turning on Flux for RR (and NS-NS) field strengths on non-compact Calabi-Yau 3-folds can serve as a way to partially break supersymmetry from N = 2 to N = 1 by mass deformation. The freezing of the moduli of Calabi-Yau in the presence of the flux is the familiar phenomenon of freezing

The MODIS aerosol algorithm, products, and validation,

by L A Remer , Y J Kaufman , D Tanré , S Mattoo , D A Chu , J V Martins , R.-R Li , ## C Ichoku , R C Levy , R G Kleidman , T F Eck , @@ E Vermote , B N Holben , Lorraine A Remer@nasa , Gov - J. Atmos. Sci., , 2005
"... ABSTRACT The Moderate Resolution Imaging Spectroradiometer (MODIS) aboard both NASA's Terra and Aqua satellites is making near-global daily observations of the earth in a wide spectral range (0.41-15 m). These measurements are used to derive spectral aerosol optical thickness and aerosol size ..."
Abstract - Cited by 247 (27 self) - Add to MetaCart
contributed by the aerosol, mass concentration, and number of cloud condensation nuclei round out the list of available aerosol products over the ocean. The spectral optical thickness and effective radius of the aerosol over the ocean are validated by comparison with two years of Aerosol Robotic Network
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