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A numerical study of mesoscale effects in the coastal climate

Eine numerische Untersuchung mesoskaliger Effekte im Küstenklima

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Summary

When modelling mesoscale effects in the coastal climate we have to account for the significant influence of humidity and for the land-sea contrast which is represented by the roughness lengthz 0 =z 0(x, y) and the heat capacityC 0 =C 0 (x, y). This brings about strong horizontal inhomogenities which affect the meteorological situation significantly.

The effects of these inhomogenities on the structure and variation of the boundary layer in the coastal region are studied by use of a three-dimensional numerical model; the formation process of advective fog in connection with different geostrophic winds is also investigated.

As main results we present 1) the modifications of wind velocity and wind direction as a function of the roughness distribution and different thermal stratifications and 2) two simulations of advective fog formation assuming different geostrophic wind values in each example.

Zusammenfassung

Bei der Modellierung mesoskaliger Küstenklimaeffete sind wegen des Übergangs Land-Meer, repräsentiert durch die Rauhigkeitslangez 0 =z 0 (x, y) und die WärmekapazitätC 0 =C 0 (x,y), und des verstärkten Einflusses der Feuchte ausgeprägte Inhomogenitaten zu berücksichtigen, welche die meteorologischen Verhältnisse signifikant mitgestalten.

Mit Hilfe eines dreidimensionalen numerischen Modells werden in der vorliegenden Arbeit die Auswirkungen solcher horizontaler Inhomogenitaten auf Struktur und Variation der Grenzschicht in der Küstenregion studiert, Bowie die Entstehung von Advektionsnebel unter dem Einfluss unterschiedlicher geostrophischer Winde untersucht.

Die Modifizierung der Windstärke und Windrichtung in ihrer Abhängigkeit von der Rauhigkeitslange und der unterschiedlichen thermischen Schichtung Bowie zwei Beispiele von Advektionsnebelbildung bei unterschiedlichem geostrophischem Wind werden als Ergebnisse vorgestellt.

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Authors and Affiliations

  1. Meteorologisches Institut, Universität Hamburg, Bundesstrasse 55, D-2000, Hamburg 13, Germany

    M. Dunst & S. Lagrange

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  1. M. Dunst
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  2. S. Lagrange
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Dunst, M., Lagrange, S. A numerical study of mesoscale effects in the coastal climate. Arch. Met. Geoph. Biocl., Ser. B 32, 161–185 (1983). https://doi.org/10.1007/BF02273972

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  • DOI: https://doi.org/10.1007/BF02273972

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