The Moist Boundary Layer under a Mid-latitude Weather System |
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Authors: | I A Boutle R J Beare S E Belcher A R Brown R S Plant |
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Institution: | (1) Canadian Centre for Climate Modelling and Analysis, Meteorological Service of Canada, University of Victoria, P.O. Box 1700, STN CSC, Victoria, Victoria, BC, V8W 2Y2, Canada |
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Abstract: | Mid-latitude weather systems are key contributors to the transport of atmospheric water vapour, but less is known about the
role of the boundary layer in this transport. We expand a conceptual model of dry boundary-layer structure under synoptic
systems to include moist processes, using idealised simulations of cyclone waves to investigate the three-way interaction
between the boundary layer, atmospheric moisture and large-scale dynamics. Forced by large-scale thermal advection, boundary-layer
structures develop over large areas, analogous to the daytime convective boundary layer, the nocturnal stable boundary layer
and transitional regimes between these extremes. A budgeting technique demonstrates the key role of boundary-layer processes
in the transport of moisture. Moisture is evaporated from the ocean behind the cold front and in the high-pressure part of
the wave, and transported large distances within the boundary layer into the footprint of the warm-conveyor belt. The warm-conveyor
belt forms one of the two main processes of boundary-layer ventilation, with shallow cumulus convection being of similar importance. |
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