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Evidence for Nearly Complete Decoupling of Very Stable Nocturnal Boundary Layer Overland

Xia, Yu ; Conen, Franz ; Haszpra, Laszlo ; Ferenczi, Zita ; Zahorowski, Wlodek

In: Boundary-Layer Meteorology, 2011, vol. 138, no. 1, p. 163-170

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    Titel
    • Evidence for Nearly Complete Decoupling of Very Stable Nocturnal Boundary Layer Overland
    Autor
    • Xia, Yu. Institute of Environmental Geosciences, University of Basel, Bernoullistrasse 30, 4056, Basel, Switzerland
    • Conen, Franz. Institute of Environmental Geosciences, University of Basel, Bernoullistrasse 30, 4056, Basel, Switzerland
    • Haszpra, Laszlo. Hungarian Meteorological Service, P.O. Box 39, 1675, Budapest, Hungary
    • Ferenczi, Zita. Hungarian Meteorological Service, P.O. Box 39, 1675, Budapest, Hungary
    • Zahorowski, Wlodek. Australian Nuclear Science and Technology Organization, Locked Bag 2001, 2232, Kirrawee DC, NSW, Australia
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Boundary-Layer Meteorology, 2011, vol. 138, no. 1, p. 163-170. Springer Netherlands
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:311399
    Summary
    Concentrations of 222Rn at 0.1m and 6.5m height above ground level and 222Rn flux density were measured during nights characterized by strong cooling, light winds and clear sky conditions in the Carpathian Basin in Hungary. A very stable boundary layer (vSBL) formed on 14 nights between 15 August and 3 September 2009. On 12 nights, an estimated 72% (s.d. 20%) of 222Rn emitted from the surface since sunset was retained within the lowest 6.5m above the ground until sunrise the following morning. On two nights an intermittent increase in wind speed at 9.4m height was followed by a rise in temperature at 2.0m height, indicating a larger atmospheric motion that resulted in 222Rn at 0.1m around sunrise being the same as around the preceding sunset. It does not seem to be rare in a large continental basin for a vSBL to be nearly completely decoupled from the atmosphere above for the entire period from sunset to sunrise