On the Preferred Mode of Cumulus Convection in a Conditionally Unstable Atmosphere

Asai, Tomio

doi:10.1007/978-94-009-7890-4_10

Cited by 4 publications

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References 20 publications

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“…The model of the previous paper (Asai and Nakasuji, 1977) is revised to deal with water vapor explicitly. A preferred mode of cumulus convection is obtained by the same method as the previous paper.…”

Section: Discussionmentioning

confidence: 99%

“…The cumulus convection in a conditionally unstable atmosphere was studied by Asai and Nakasuji (1977), which hereafter will be referred to as paper AN, to see how the preferred mode depends on a mean vertical motion and a static stability in the atmospheric layer and the magnitude of each term of the energy equations depends on the cell size of cumulus convection. The results obtained are that the preferred cell size decreases and the preferred area ratio of the ascending region to the descending one increases as the mean vertical velocity increases.…”

Section: Introductionmentioning

confidence: 99%

“…

AbstractNumerical experiments are made to determine a preferred mode of cumulus convection in a conditionally unstable atmosphere.The model developed in the previous study (Asai and Nakasuji, 1977) is extended to deal with water vapor explicitly. The preferred mode of cumulus convection is regarded as the steady convection cell attained eventually after a random potential temperature disturbance is imposed initially.

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confidence: 99%

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A Further Study of the Preferred Mode of Cumulus Convection in a Conditionally Unstable Atmosphere

Asai

Nakasuji

1982

Journal of the Meteorological Society of Japan

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Numerical experiments are made to determine a preferred mode of cumulus convection in a conditionally unstable atmosphere.The model developed in the previous study (Asai and Nakasuji, 1977) is extended to deal with water vapor explicitly. The preferred mode of cumulus convection is regarded as the steady convection cell attained eventually after a random potential temperature disturbance is imposed initially. It is shown that the preferred scale of the convection cell and the preferred cloud coverage depend on mean vertical velocity, static stability and relative humidity. It is confirmed that the preferred cumulus convection minimizes the potential energy and consequently the mean temperature lapse-rate in the convective layer. IntroductionThe cumulus convection in a conditionally unstable atmosphere was studied by Asai and Nakasuji (1977), which hereafter will be referred to as paper AN, to see how the preferred mode depends on a mean vertical motion and a static stability in the atmospheric layer and the magnitude of each term of the energy equations depends on the cell size of cumulus convection. The results obtained are that the preferred cell size decreases and the preferred area ratio of the ascending region to the descending one increases as the mean vertical velocity increases. Without a mean upward motion the preferred cell size increases and the preferred area ratio decreases as the static instability decreases. While with a mean upward motion the preferred cell size decreases and the preferred area ratio increases as the static instability decreases smaller than a certain value. The preferred mode of a cumulus convection cell is the one for which the potential energy of the convective layer is at the lowest so that the mean temperature lapse-rate beccmes minimum.It was assumed in the previous paper that the ascending motion was always saturated with water vapor while the descending motion was always unsaturated.This assumption may be allowed only when the convective layer is supplied with water vapor sufficiently.In the present paper water vapor is introduced into the model in an explicit form to examine the results obtained in the previous paper AN.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

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confidence: 99%

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A Further Study of the Preferred Mode of Cumulus Convection in a Conditionally Unstable Atmosphere

Asai

Nakasuji

1982

Journal of the Meteorological Society of Japan

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“…Asai andNakasuji (1977, 1982) studied moist convection in a quasi-steady state using a model with simplified microphysics. The earliest long-term simulations of moist radiative-convective equilibrium were based on two-dimensional (2D) experiments.…”

Section: Introductionmentioning

confidence: 99%

A Theory for Buoyancy and Velocity Scales in Deep Moist Convection

Parodi

Emanuel

2009

Journal of the Atmospheric Sciences

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Buoyancy and velocity scales for dry convection in statistical equilibrium were derived in the early twentieth century by Prandtl, but the scaling of convective velocity and buoyancy, as well as the fractional area coverage of convective clouds, is still unresolved for moist convection.In this paper, high-resolution simulations of an atmosphere in radiative-convective equilibrium are performed using the Weather Research and Forecasting (WRF) model, a three-dimensional, nonhydrostatic, convection-resolving, limited-area model. The velocity and buoyancy scales for moist convection in statistical equilibrium are characterized by prescribing different constant cooling rates to the system.It is shown that the spatiotemporal properties of deep moist convection and buoyancy and velocity scales at equilibrium depend on the terminal velocity of raindrops and a hypothesis is developed to explain this behavior. This hypothesis is evaluated and discussed in the context of the numerical results provided by the WRF model. The influence of domain size on radiative-convective equilibrium statistics is also assessed. The dependence of finescale spatiotemporal properties of convective structures on numerical and physical details is investigated.

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Stability and wind shear effects on meso-scale cellular convection

Zhang

Atkinson

1995

Boundary-Layer Meteorol

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On the Preferred Mode of Cumulus Convection in a Conditionally Unstable Atmosphere

Cited by 4 publications

References 20 publications

A Further Study of the Preferred Mode of Cumulus Convection in a Conditionally Unstable Atmosphere

A Further Study of the Preferred Mode of Cumulus Convection in a Conditionally Unstable Atmosphere

A Theory for Buoyancy and Velocity Scales in Deep Moist Convection

Stability and wind shear effects on meso-scale cellular convection

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