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Turbulent Dispersion of Non-uniformly Emitted Passive Tracers in the Convective Boundary Layer

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Abstract

The impact of spatially non-uniform emissions on the turbulence dispersion of passive tracers in the convective boundary layer is studied by means of large-eddy simulation. We explicitly calculated the different terms of the budget equations for the concentrations, fluxes and variances, and used sub-domain averaging where each sub-domain is the typical size of a large-scale model grid cell. We found that the concentration profiles in the sub-domain where the emission takes place are lightly affected by the size of the emission release. This effect becomes more relevant in the downwind sub-domain. Although sub-domain averaged fluxes are not affected by the emission source size, concentration variances are dramatically increased when the emission shrinks. This increase originates from the mixing of highly concentrated air parcels with those of low concentrations. We also found that the concentration variance at the surface is driven neither by the position of the emission source nor the strength of the shear forcing but solely by the emission variance.

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References

  • Auger L, Legras B (2007) Chemical segregation by heterogeneous emissions. Atmos Environ 41: 2303–2318

    Article  Google Scholar 

  • Chatfield RB, Brost RA (1987) A two-stream model of the vertical transport of trace species in the convective boundary layer. J Geophys Res 92: 13262–13276

    Google Scholar 

  • Cuijpers JWM, Duynkerke PG (1993) Large eddy simulations of trade wind with cumulus clouds. J Atmos Sci 50: 3894–3908

    Article  Google Scholar 

  • Cuijpers JWM, Holtslag AAM (1998) Impact of skewness and nonlocal effects on scalar and buoyancy fluxes in convective boundary layers. J Atmos Sci 55: 151–162

    Article  Google Scholar 

  • Deardorff J (1979) Prediction of convective mixed-layer entrainment for realistic capping inversion structure. J Atmos Sci 36: 424–436

    Article  Google Scholar 

  • Ebert EE, Schumann U, Stull RB (1989) Nonlocal turbulent mixing in the convective boundary layer evaluated from large-eddy simulation. J Atmos Sci 46: 2178–2207

    Article  Google Scholar 

  • Fiedler BH, Moeng C-H (1985) A practical integral closure model for the mean vertical transport of a scalar in a convective boundary layer. J Atmos Sci 42: 359–363

    Article  Google Scholar 

  • Galmarini S, Vinuesa J-F, Martilli A (2008) Modelling the impact of sub-grid scale emission variability on upper-air concentration. Atmos Chem Phys 8: 141–158

    Google Scholar 

  • Krol MC, Molemaker MJ, Vilà-Guerau de Arellano J (2000) Effects of turbulence and heterogeneous emissions on photochemically active species in the convective boundary layer. J Geophys Res 105: 6871–6884

    Article  Google Scholar 

  • Lamb RG (1978) A numerical simulation of dispersion from an elevated point source in the convective boundary layer. Atmos Environ 12: 1297–1304

    Article  Google Scholar 

  • Moeng C-H, Wyngaard JC (1984) Statistics of conservative scalars in the convective boundary layer. J Atmos Sci 41: 3161–3169

    Article  Google Scholar 

  • Nieuwstadt JC, de Valk JPJMM (1987) A large eddy simulation of buoyant and non-buoyant plume dispersion in the atmospheric boundary layer. Atmos Environ 21: 2573–2587

    Article  Google Scholar 

  • Schumann U (1989) Large-eddy simulation of turbulent diffusion with chemical reactions in the convective boundary layer. Atmos Env 23: 1713–1729

    Article  Google Scholar 

  • Siebesma AP, Cuijpers JWM (1995) Evaluation of parametric assumptions for shallow cumulus convection. J Atmos Sci 52: 650–666

    Article  Google Scholar 

  • Sun W-Y, Chang C-Z (1986) Diffusion model for a convective layer. Part 2: plume released from a continuous point source. J Climate Appl Meteorol 25: 1454–1463

    Article  Google Scholar 

  • Vilà-Gueraude Arellano J, Cuijpers JWM (2000) The chemistry of a dry cloud: the effects of radiation and turbulence. J Atmos Sci 57: 1573–1584

    Article  Google Scholar 

  • Vinuesa J-F, Galmarini S (2007) Characterization of the 222Rn family turbulent transport in the convective atmospheric boundary layer. Atmos Chem Phys 7: 697–712

    Article  Google Scholar 

  • Wyngaard JC (1985) Structure of the planetary boundary layer and implications for its modeling. J Appl Meteorol 24: 1131–1142

    Article  Google Scholar 

  • Wyngaard JC, Brost RA (1984) Top-down and bottom-up diffusion of a scalar in the convective boundary layer. J Atmos Sci 41: 102–112

    Article  Google Scholar 

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Authors and Affiliations

  1. Institute for Environment and Sustainability, Joint Research Centre, European Commission, 21020, Ispra, Italy

    Jean-François Vinuesa & Stefano Galmarini

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  1. Jean-François Vinuesa
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  2. Stefano Galmarini
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Correspondence to Stefano Galmarini.

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Vinuesa, JF., Galmarini, S. Turbulent Dispersion of Non-uniformly Emitted Passive Tracers in the Convective Boundary Layer. Boundary-Layer Meteorol 133, 1–16 (2009). https://doi.org/10.1007/s10546-009-9416-0

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  • DOI: https://doi.org/10.1007/s10546-009-9416-0

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