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2 edition of Subgrid-scale vertical energy fluxes over the African-Atlantic region found in the catalog.

Subgrid-scale vertical energy fluxes over the African-Atlantic region

Thomas Burkhardt

Subgrid-scale vertical energy fluxes over the African-Atlantic region

by Thomas Burkhardt

  • 192 Want to read
  • 7 Currently reading

Published by Dümmler in Bonn .
Written in English

    Places:
  • Africa.,
  • Atlantic Ocean.
    • Subjects:
    • Intertropical convergence zone.,
    • Atmospheric circulation -- Africa.,
    • Atmospheric circulation -- Atlantic Ocean.,
    • Energy budget (Geophysics) -- Africa.,
    • Energy budget (Geophysics) -- Atlantic Ocean.,
    • Enthalpy.

    • Edition Notes

      StatementThomas Burkhardt.
      SeriesBonner meteorologische Abhandlungen,, Heft 39
      Classifications
      LC ClassificationsQC851 .B64 Heft 39, QC993.5 .B64 Heft 39
      The Physical Object
      Pagination105, [9] p. :
      Number of Pages105
      ID Numbers
      Open LibraryOL1659523M
      ISBN 103427759911
      LC Control Number91222183

      Meteorol. Zeitschrift, N.F. 1, (April ) @ by Gebriider Borntraeger Water vapour as an amplifier of the greenhouse effect: new aspects. H. FLOHN, A. T1 - Subgrid-scale energy transfer and near-wall turbulence structure. AU - Piomelli, Ugo. AU - Yu, Yunfang. AU - Adrian, Ronald J. PY - /1/1. Y1 - /1/1. N2 - Conditional averages of the velocity field, subgrid-scale (SGS) stresses and SGS dissipation are calculated using the velocity fields obtained from the DNS of plane channel flow.

        Figure 8(b) shows the normalized total and partial (resolved and subgrid-scale) streamwise fluxes obtained from the 3 simulation using the MGM and the normalized total streamwise fluxes obtained from the 64 3 simulations using the MGM and the MSM with two constant Sc sgs values. Unlike the normalized wall-normal fluxes, which should be. Below PB the subgrid scale fluxes of sand q are linear in p with the values (Fs)o and (Fq)o at the surface Po and the values (Fs)B and CFq)B just below PBo The subgrid scale flux of f is zero everywhere below PBo Above PB the subgrid scale fluxes are accomplished by the cloud ensemble.

        The size of this cold region is not set by the length scale of stationary waves 9, but is controlled by the distance over which wave groups are radiated westwards before they dissipate. In this paper, data from the US DOE Cloud and Radiation Testbed (CART) site is combined with results from a mesoscale model to examine the effects of spatially-varying surface fluxes on some features of the planetary boundary layer (PBL). Precipitation data from several sources was used to generate.


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Subgrid-scale vertical energy fluxes over the African-Atlantic region by Thomas Burkhardt Download PDF EPUB FB2

Over the Saharan latitudes, there is considerable convective flux of sensible heat, but not of latent heat. Over the ocean, deep convection in the ITCZ is weaker than over Africa, and it is consistently correlated with upward converging subscale moisture flux.

The fields of the subscale vertical fluxes are coherent in space and by: 1. The vertical correlation decays fastest for enthalpy, where the correlation drops below after a distance of 75 hPa. Vertical correlation becomes negative for all errors for distances larger than hPa.

The vertical correlations indicate a clear vertical structure of the transport : Michiel Van Ginderachter, Michiel Van Ginderachter, Daan Degrauwe, Daan Degrauwe, Stéphane Vannitsem.

In the YSU and MYJ simulations, the resolved eyewall perturbations with wavenumbers greater than 20 contribute roughly one third of the total energy of vertical and horizontal fluxes, whereas the disturbances with low wavenumber 1–4 collectively contribute about 20% of the total energy for buoyancy fluxes and about 25–30% for moisture by: Subgrid-Scale Vertical Energy Fluxes over the African-Atlantic Region Bonner Meteorologische Abhandlun p Burkhardt, Th.: Subgrid-Scale Vertical Heat Fluxes for the African Region Meteorol.

Atmos. Phys., 46, Mitarbeit bei: Kraus, H.: Die Atmosphäre der Erde Springer, ISBN Kraus, H. Subgrid-scale upper ocean vertical mixing is too low in EC-Earth when compared to estimates from reanalysis data, potentially giving rise to the warm bias.

We perform sensitivity experiments to examine the effect of enhanced vertical mixing on the SST bias in quasi equilibrium present day climate and its impact on projected climate : Anna Lena Deppenmeier, Rein J. Haarsma, Philippe LeSager, Wilco Hazeleger. Conditional averages of the velocity field, subgrid‐scale (SGS) stresses and SGS dissipation are calculated using the velocity fields obtained from the DNS of plane channel flow.

The detection criteria isolate the coherent turbulent structures that contribute most strongly to the energy transfer between the large, resolved scales and the subgrid, unresolved, ones. results with such filter scales are generally insensitive to the subgrid-scale (SGS) model employed (Nieuwstadt & de Valk ; Mason ).

In LES of high-Reynolds-number turbulent boundary layers, however, the filter scale in the near-wall region is inevitably in the energy. Vertical heat flux response to a uniform +2°C warming perturbation.

(a) Change from the equilibrium vertical heat fluxes, averaged over the first 10 years of the perturbation, integrated over the entire domain (solid lines) and the contribution from the southern region (dashed lines). Vertical Eddy Energy Fluxes in the North Atlantic Subtropical and Subpolar Gyres Over 80% of the wind energy input is found to be released by the generation of eddies through baroclinic instability.

The eddy energy generation is located near the surface in the subtropical gyre but vertical energy flux associated with the internal waves/.

Ian Simmonds, Anthony Rafter, Timothy Cowan, Andrew B. Watkins, Kevin Keay, Large-scale Vertical Momentum, Kinetic Energy and Moisture Fluxes in the Antarctic Sea-ice Region, Boundary-Layer Meteorology, /s,1, (), ().

T h u s, there may still be vertical subgrid scale transports of total static energy b y processes expressed by the primed terms in equation (6) even when M goes zero. Parameterization of c the cloud fluxes in numerical models b y only the first part of term II in equation (6) will therefore normally result in unrealistic values of M and.

Subgrid-scale vertical fluxes of various types of precipitating condensate—namely, rain, graupel, cloud ice, and snow—are examined using a high-resolution cloud-resolving simulation of continental deep convection. An eddy-diffusion approximation to the vertical hydrometeor flux is evaluated against the benchmark simulation.

This goal can be accomplished by investigating the energy fluxes by the SGS terms averaged over the longitudinal direction.

We define the longitudinal average of work of Reynolds stress F T, work of the SGS Lorentz force F M, and magnetic energy flux by the SGS induction term F a as, (24) F T = 1 2 π ∫ - u ̃ i ∂ T ij ∂ x j d ϕ, ( The vertical profiles of KH1 and KH are similar in the lower half of the CBL, but KH falls off at the top of the CBL owing to the absence of the model predicted subgrid-scale TKE.

The profile of KH1 mainly follows that of the fitted according to Eq. Time series of at m AGL is presented in Fig. 10b to show its temporal evolution.

Generally, the subgrid‐scale dynamic component consists of the subgrid‐scale vertical flux divergences and horizontal flux divergences that are not parameterized. The nonparameterized component must be included as part of the large‐scale forcing, as we will see in section 2.

In the latest GCMs, the subgrid‐scale vertical fluxes. Simulating model uncertainty of subgrid-scale processes by sampling model errors at convective scales Article (PDF Available) May with 98 Reads How we measure 'reads'.

Ghasem Akbari and Nader Montazerin, A-priori study of subgrid-scale models for the flow field in the rotor exit region of a centrifugal turbomachine, International Journal of. Large-eddy simulation is used to study the influence of free-atmosphere stratification on the structure of atmospheric boundary-layer flow inside and above very large wind farms, as well as the power extracted by the wind turbines.

In the simulations, tuning-free Lagrangian scale-dependent dynamic models are used to model the subgrid-scale turbulent fluxes, while the turbine-induced forces are. The subgrid-scale kinetic energy is defined as.

The subgrid-scale stress can then be written as this gives us the transport equation for subgrid-scale kinetic energy. The subgrid-scale eddy viscosity, is computed using as.

Here we discuss a technique to estimate this quantity within the lower part of an atmospheric column by relating b to the subgrid-scale fluxes of sensible and latent heat in form of their sum (the. UDC ()''" Mass and Energy Transports in an Undisturbed Atlantic Trade-Wind flow ERNST AUGSTEIN-Institute fur Radiometeorologie und (UDC ()''\.Compared to the representation of vertical turbulent mixing through various planetary boundary layer (PBL) schemes, the treatment of horizontal turbulent mixing in the boundary layer has received much less attention.

In mesoscale and convective-scale models, subgrid-scale. The results we present are averages over the last days of, day simulations (with 1 day = s, irrespective of the planetary rotation rate).

During the first, days of the simulation, we adjusted the subgrid-scale dissipation parameters to the values stated above to ensure there was no energy build-up at the smallest resolved.