Boundary-Layer Meteorology

, Volume 134, Issue 2, pp 327–351 | Cite as

Idealised Simulations of Daytime Pollution Transport in a Steep Valley and its Sensitivity to Thermal Stratification and Surface Albedo

  • M. Lehner
  • A. Gohm


Numerical simulations of tracer transport in an idealised, east-west aligned valley are performed with the Regional Atmospheric Modeling System (RAMS), both two-dimensional and three-dimensional. The results are qualitatively consistent with wintertime observations in the Austrian Inn Valley. The simulations show an asymmetry in wind circulation and tracer distribution between the valley sidewalls according to the orientation of the slope with respect to the sun. Two-dimensional sensitivity experiments are run to investigate the influence of vertical inhomogeneities in thermal stratification and vegetation coverage on the slope-wind circulation and therewith the tracer transport. It is shown that a transition to a layer of higher stability or to a region with higher surface albedo causes a reduction of the mass flux in the upslope-wind layer and due to mass continuity a quasi-horizontal transport out of the slope-wind layer.


Anabatic winds Cross-valley winds Numerical modelling Tracer transport 


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  1. Anquetin S, Guilbaud C, Chollet J-P (1998) The formation and destruction of inversion layers within a deep valley. J Appl Meteorol 37: 1547–1560CrossRefGoogle Scholar
  2. Anquetin S, Guilbaud C, Chollet J-P (1999) Thermal valley inversion impact on the dispersion of a passive pollutant in a complex mountainous area. Atmos Environ 33: 3953–3959CrossRefGoogle Scholar
  3. Bader DC, McKee TB (1983) Dynamical model simulation of the morning boundary layer development in deep mountain valleys. J Clim Appl Meteorol 22: 341–351CrossRefGoogle Scholar
  4. Bader DC, McKee TB (1985) Effects of shear, stability and valley characteristics on the destruction of temperature inversions. J Clim Appl Meteorol 24: 822–832CrossRefGoogle Scholar
  5. Bader DC, Whiteman CD (1989) Numerical simulation of cross-valley plume dispersion during the morning transition period. J Appl Meteorol 28: 652–664CrossRefGoogle Scholar
  6. Banta RM, Gannon PT (1995) Influence of soil moisture on simulations of katabatic flow. Theor Appl Clim 52: 85–94CrossRefGoogle Scholar
  7. Chazette P, Couvert P, Randriamiarisoa H, Sanak J, Bonsang B, Moral P, Berthier S, Salanave S, Toussaint F (2005) Three-dimensional survey of pollution during winter in French Alps valleys. Atmos Environ 39: 1035–1047CrossRefGoogle Scholar
  8. Chen C, Cotton WR (1983) A one-dimensional simulation of the stratocumulus-capped mixed layer. Boundary-Layer Meteorol 25: 289–321CrossRefGoogle Scholar
  9. Chow FK, Weigel AP, Street RL, Rotach MW, Xue M (2006) High-resolution large-eddy simulations of flow in a steep Alpine valley. Part I: methodology, verification, and sensitivity experiments. J Appl Meteorol Clim 45: 63–86CrossRefGoogle Scholar
  10. Colette A, Chow FK, Street RL (2003) A numerical study of inversion-layer breakup and the effects of topographic shading in idealized valleys. J Appl Meteorol 42: 1255–1272CrossRefGoogle Scholar
  11. Cotton WR, Pielke RA, Walko RL, Liston GE, Tremback CJ, Jiang H, McAnelly RL, Harrington JY, Nicholls ME, Carrio GG, McFadden JP (2003) RAMS 2001: current status and future directions. Meteorol Atmos Phys 82: 5–29CrossRefGoogle Scholar
  12. Derbyshire SH (1999) Boundary-layer decoupling over cold surfaces as a physical boundary-instability. Boundary-Layer Meteorol 90: 297–325CrossRefGoogle Scholar
  13. De Wekker SFJ, Steyn DG, Nyeki S (2004) A comparison of aerosol-layer and convective boundary-layer structure over a mountain range during STAAARTE ’97. Boundary-Layer Meteorol 113: 249–271CrossRefGoogle Scholar
  14. De Wekker SFJ, Steyn DG, Fast JD, Rotach MW, Zhong S (2005) The performance of RAMS in representing the convective boundary layer structure in a very steep valley. Environ Fluid Mech 5: 35–62CrossRefGoogle Scholar
  15. Gal-Chen T, Sommerville RCJ (1975) On the use of a coordinate transformation for the solution of the Navier–Stokes equations. J Comput Phys 17: 209–228CrossRefGoogle Scholar
  16. Gohm A, Harnisch F, Fix A (2006) Boundary layer structure in the Inn Valley during high air pollution (INNAP). In: Extended abstract of the 12th conference on mountain meteorology. Santa Fe, New Mexico. Accessed 24 Apr 2009
  17. Gohm A, Harnisch F, Vergeiner J, Obleitner F, Schnitzhofer R, Hansel A, Fix A, Neininger B, Emeis S, Schäfer K (2009) Air pollution transport in an Alpine valley: results from airborne and ground-based observations. Boundary-Layer Meteorol. doi: 10.1007/s10546-009-9371-9
  18. Hanna SR, Strimaitis DG (1990) Rugged terrain effects on diffusion. In: Blumen W (ed) Atmospheric processes over complex terrain, meteorological monographs, vol 23. American Meteorological Society, pp 109–143Google Scholar
  19. Harnisch F, Gohm A, Fix A, Schnitzhofer R, Hansel A, Neininger B (2009) Spatial distribution of aerosols in the Inn Valley atmosphere during wintertime. Meteorol Atmos Phys 103: 223–235CrossRefGoogle Scholar
  20. Heimann D, de Franceschi M, Emeis S, Lercher P, Seibert P (eds) (2007) Air pollution, traffic noise and related health effects in the Alpine space—a guide for authorities and consulters. ALPNAP comprehensive report. Università degli Studi di Trento, Dipartimento di Ingegneria Civile e Ambientale, Trento, Italy, 335 ppGoogle Scholar
  21. Hill GE (1974) Factors controlling the size and spacing of cumulus clouds as revealed by numerical experiments. J Atmos Sci 31: 646–673CrossRefGoogle Scholar
  22. Klemp JB, Wilhelmson RB (1978) The simulation of three-dimensional convective storm dynamics. J Atmos Sci 35: 1070–1096CrossRefGoogle Scholar
  23. Lehner M (2008) Idealized sensitivity study of pollution transport over Alpine terrain. Master’s thesis, Institute of Meteorology and Geophysics, University of Innsbruck, 160 ppGoogle Scholar
  24. Lilly DK (1962) On the numerical simulation of buoyant convection. Tellus XIV:148–172Google Scholar
  25. Louis JF, Tiedtke M, Geleyn J-F (1981) A short history of the operational PBL—parameterization at ECMWF. In: Proc workshop on planetary boundary layer parameterization. ECMWF, Reading, United Kingdom, pp 59–79Google Scholar
  26. McNider RT, Pielke RA (1984) Numerical simulation of slope and mountain flows. J Clim Appl Meteorol 23: 1441–1453Google Scholar
  27. Meesters AGCA, Tolk LF, Dolman AJ (2008) Mass conservation above slopes in the regional atmospheric modelling system (RAMS). Environ Fluid Mech 8: 239–248CrossRefGoogle Scholar
  28. Michioka T, Chow FK (2008) High-resolution large-eddy simulations of scalar transport in atmospheric boundary layer flow over complex terrain. J Appl Meteorol Clim 47: 3150–3169CrossRefGoogle Scholar
  29. Pielke RA, Cotton WR, Walko RL, Tremback CJ, Lyons WA, Grasso LD, Nicholls ME, Moran MD, Wesley DA, Lee TJ, Copeland JH (1992) A comprehensive meteorological modeling system RAMS. Meteorol Atmos Phys 49: 69–91CrossRefGoogle Scholar
  30. Poulos GS, Burns SP (2003) An evaluation of bulk Ri-based surface layer flux formulas for stable and very stable conditions with intermittent turbulence. J Atmos Sci 60: 2523–2537CrossRefGoogle Scholar
  31. Poulos GS, Bossert JE, McKee TB, Pielke RA (2000) The interaction of katabatic flow and mountain waves. Part I: observations and idealized simulations. J Atmos Sci 57: 1919–1936CrossRefGoogle Scholar
  32. Reuten C, Steyn DG, Strawbridge KB, Bovis P (2005) Observations of the relation between upslope flows and the convective boundary layer in steep terrain. Boundary-Layer Meteorol 116: 37–61CrossRefGoogle Scholar
  33. Reuten C, Steyn DG, Allen SE (2007) Water tank studies of atmospheric boundary layer structure and air pollution transport in upslope flow systems. J Geophys Res 112: D11114CrossRefGoogle Scholar
  34. Schnitzhofer R, Norman M, Wisthaler A, Vergeiner J, Harnisch F, Gohm A, Obleitner F, Fix A, Neininger B, Hansel A (2009) A multimethodological approach to study the spatial distribution of air pollution in an Alpine valley during wintertime. Atmos Chem Phys 9: 3385–3396CrossRefGoogle Scholar
  35. Smagorinsky J (1963) General circulation experiments with the primitive equations. I: the basic experiment. Mon Weather Rev 91: 99–164CrossRefGoogle Scholar
  36. Vergeiner I, Dreiseitl E (1987) Valley winds and slope winds—observations and elementary thoughts. Meteorol Atmos Phys 36: 264–286CrossRefGoogle Scholar
  37. Vosper SB, Brown AR (2008) Numerical simulations of sheltering in valleys: the formation of nighttime cold-air pools. Boundary-Layer Meteorol. doi: 10.1007/s10546-008-9272-3
  38. Weigel AP, Chow FK, Rotach MW, Street RL, Xue M (2006) High-resolution large-eddy simulations of flow in a steep Alpine valley. Part II: flow structure and heat budgets. J Appl Meteorol Clim 45: 87–107CrossRefGoogle Scholar
  39. Whiteman CD (1989) Morning transition tracer experiments in a deep narrow valley. J Appl Meteorol 28: 626–635CrossRefGoogle Scholar
  40. Whiteman CD, McKee TB (1982) Breakup of temperature inversions in deep mountain valleys: Part II. Thermodynamic model. J Appl Meteorol 21: 290–302CrossRefGoogle Scholar
  41. Zängl G (2002) An improved method for computing horizontal diffusion in a sigma-coordinate model and its application to simulations over mountainous topography. Mon Weather Rev 130: 1423–1432CrossRefGoogle Scholar
  42. Zängl G, Gohm A, Obleitner F (2007) The impact of the PBL scheme and the vertical distribution of model layers on simulations of Alpine foehn. Meteorol Atmos Phys. doi: 10.1007/s00703-007-0276-1
  43. Zhang D, Anthes RA (1982) A high-resolution model of the planetary boundary layer—sensitivity tests and comparisons with SESAME-79 data. J Appl Meteorol 21: 1594–1609CrossRefGoogle Scholar
  44. Zhong S, Whiteman CD (2008) Downslope flows on a low-angle slope and their interactions with valley inversions. Part II: numerical Modeling. J Appl Meteorol Clim 47: 2039–2057CrossRefGoogle Scholar

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© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Institute of Meteorology and GeophysicsUniversity of InnsbruckInnsbruckAustria
  2. 2.Department of Atmospheric SciencesUniversity of UtahSalt Lake CityUSA

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