The influence of thermal effects on the wind speed profile of the coastal marine boundary layer

B. Lange, Søren Ejling Larsen, Jørgen Højstrup, R.J. Barthelmie

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The wind speed profile in a coastal marine environment is investigated with observations from the measurement program Rodsand, where meteorological data are collected with a 50 m high mast in the Danish Baltic Sea, about 11 km from the coast. When compared with the standard Monin-Obukhov theory the measured wind speed increase between 10 m and 50 m height is found to be systematically larger than predicted for stable and near-neutral conditions. The data indicate that the deviation is smaller for short (10 - 20 km) distances to the coast than for larger (> 30 km) distances.

    The theory of the planetary boundary layer with an inversion lid offers a qualitative explanation for these findings. When warm air is advected over colder water, a capping inversion typically develops. The air below is constantly cooled by the water and gradually develops into a well-mixed layer with near-neutral stratification. Typical examples as well as scatter plots of the data are consistent with this explanation. The deviation of measured and predicted wind speed profiles is shown to be correlated with the estimated height and strength of the inversion layer.
    Original languageEnglish
    JournalBoundary-Layer Meteorology
    Volume112
    Issue number3
    Pages (from-to)587-617
    ISSN0006-8314
    DOIs
    Publication statusPublished - 2004

    Keywords

    • Atmospheric stratification
    • Coastal influences
    • Marine boundary layer
    • Monin-Obukhov theory
    • Wind speed profile

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