The Moist Boundary Layer under a Mid-latitude Weather System

被引:50
作者
Boutle, I. A. [2 ,3 ]
Beare, R. J. [1 ]
Belcher, S. E. [2 ]
Brown, A. R. [3 ]
Plant, R. S. [2 ]
机构
[1] Univ Exeter, Sch Engn Comp & Math, Exeter EX4 4QF, Devon, England
[2] Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England
[3] Met Off, Exeter EX1 3PB, Devon, England
关键词
Cyclone waves; Moisture cycle; Synoptically-forced boundary layer; MARINE CYCLONE; LIFE-CYCLE; PART I; MODEL; INTENSIFICATION; SENSITIVITY; CONVECTION; FRICTION; FLUXES; SCHEME;
D O I
10.1007/s10546-009-9452-9
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
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.
引用
收藏
页码:367 / 386
页数:20
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