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EGGER, JOSEF (2011)
Publisher: Co-Action Publishing
Journal: Tellus A
Languages: English
Types: Article
Subjects:
Numerical forecasting and general circulation models which include orographic effects use a smoothed topography, where the steepness of the mountains is greatly reduced. An incorporation of more realistic profiles seems desirable. To that effect a new condition at the lower boundary of the atmosphere is tested which treats steep mountains as impenetrable vertical barriers. Numerical experiments are carried out in a channel where this blocking condition is applied to an alpine profile as an example of subgrid orography and to the massiv of Greenland. Two forecasts are made for each mountain starting from an initial state which imitates a low approaching the mountain from the west in a baroclinic zonal current. The first one uses a smoothed topography and the second one applies the blocking condition to the obstacle. The latter yields patterns which agree well with synoptic experience. Cyclogenesis is predicted in northern Italy which is observed to occur typically with cold outbreaks from the north in the rear of a low. Just so, cyclogenesis is frequent near the southern tip of Greenland when a low crosses the ice cap and is predicted indeed. Both phenomena are not forecast in the experiments with smoothed topography. These and other results indicate that steep mountains are incorporated more realistically into numerical models by he new blocking condition than by a smoothed topography.DOI: 10.1111/j.2153-3490.1972.tb01560.x
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • Baumhefner, D. P. 1971. On the effects of an imposed southern boundary on Numerical Weather Prediction in the northern hemisphere. Journa.2 of Atmospheric Science 28, 42-54.
    • Benwell, G. R. et, al. 1971. The Bushby-Timpson 10- level model on a fine mesh. Met. Olf., Sc.Pap. N o . 32, London.
    • Berkofsky, L. & Bertoni, E. A. 1965. Mean topographic charts for the entire earth. Bull. Amer. Met. SOC.36, 350-354.
    • Burger, A. P. 1958. Scale considerabionsof planetary motions of the atmosphere. Tellus 10, 195-205.
    • CENFAM 1963. Research work on the project “Cyclone Development in the Lee of the Alps”. S.T.R. No. 4, Rome.
    • Edelmann, W. 1963. On the behaviour of disturbances in a baroclinic channel. Res. Div. German Weather Service, Tech. Note 7.
    • Egger, J . 1970. On the simulation of subgrid orographic effects in numerical forecasting. J. Atm. S C .27, 896-902.
    • Egger, J. 1971a. On the treatment of subgrid orography in a baroclinic forecasting model. J. Atmos. Sc. 28, 1144-1152.
    • Egger, J. 1971b. MindestgroOe von Gebirgen und Konvektionsgebieten, die in den Modellen der numerischen Vorhersage berucksichtigt werden konnen. Beitr. Phys. Atm. 44, 245-271.
    • Kasahara, A. t Washington, W. M. 1971. General circulation experiments with a six-layer NCAR model including orography, cloudiness and surface temperature calculation. J. Atm. Sc. 28, 657-701.
    • Klein, W. 1957. Principal tracks and mean frequencies of cyclones and anticyclones in the northern hemisphere. Res. Pap. No. 40, U.S. Dep. Com.
    • Kurihara, Y. 1967. Note on finite difference expressions for the hydrostatic relation and pressure gradient force. Month. Weath. Rev. 95.
    • Putnins, P. 1970. The climate of Greenland. I n World Survey of Climatology; Climate of the Polar Regiom. Elsevier Publ. Comp., Amsterdam, London and New York.
    • Smagorinsky, J. e t al. 1965. Prediction experiments with a general circulation model. Proc. Symp. Dynamics Large-Scale Atm. Proc. Moscow, 70-134.
    • Walden, H. 1959. Statistisch-synotische Untersuchungen uber das Verhalten von Tiefdruckgebieten im Rereich von Gronland. Deutscher Wetterdienst, Seewetteramt, Einzelver. 20.
    • Y Y E T K P Y T b I X FOP B MOAEJIM YMCJIEHHOI'O n P O F H 0 3 A
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