Search Results - (Author, Cooperation:R. M. Banta)

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  1. 1
    Staff View
    Publication Date:
    2014-10-03
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    1434-4483
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Geosciences
    Physics
    Notes:
    Summary The study investigates two effects that a valley or canyon opening onto a plain can have on flow and contaminant dispersion over the downwind plain. The first effect is the channeling of strong ambient flow by the canyon when the wind is nearly aligned with the canyon axis. Two cases showed that these conditions produced a region of focused flow downwind of the canyon mouth. The second effect is the formation of canyon exit jets on nights with weaker ambient flow. In two case studies under these conditions strong exit jets formed that were several hundred meters deep. The jets remained narrow and strong at least 10 km onto the plains, and in one of the cases the jet extended more than 20 km over the plains. These deep jets only lasted 2–3 h, and they had a small but significant effect on surface-released tracer transport as indicated by surface sampling. We hypothesize that the near-surface advection of tracer was accomplished by a thin katabatic layer of flow, and that an elevated release or elevated sampling would have indicated a greater effect of the exit jet on tracer transport.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00865505

    Articles: DFG German National Licenses
  3. 3
    Banta, R. M. ; Gannon, P. T.
    Springer
    Published 1995
    Staff View
    ISSN:
    1434-4483
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Geosciences
    Physics
    Notes:
    Summary Simulations of katabatic flow with a two-dimensional dynamic numerical model with a soil parameterization indicate that downslope flow developed over a moist slope is weaker than that over a dry slope. This agrees with earlier findings that daytime anabatic (upslope) flow is weaker over a moister slope. But, whereas the weaker anabatic flow is produced because surface evaporation prevents the moist slope from heating as much as a dry slope, the weaker katabatic flow is produced over moist slopes because (1) the soil thermal conductivity is greater in moist soil, and (2) downward longwave radiation flux from the atmosphere to the surface is greater because of higher humidity in the air near the surface from evaporation. The higher thermal conductivity allows warmer soil temperatures (heat) to diffuse upward to the soil surface and prevents the surface temperature from becoming as cold in the moist run as in the dry run.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00865509

    Articles: DFG German National Licenses