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          Institute: MPI für Meteorologie     Collection: Climate Processes     Display Documents

ID: 223480.0, MPI für Meteorologie / Climate Processes
Double-layer structure in the boundary layer over the Baltic Sea
Authors:Johansson, C.; Hennemuth, Barbara; Bösenberg, Jens; Linné, Holger; Smedman, A. S.
Date of Publication (YYYY-MM-DD):2005-02
Title of Journal:Boundary-Layer Meteorology
Journal Abbrev.:Bound.-Layer Meteor.
Issue / Number:2
Start Page:389
End Page:412
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Double-layered structures found over the Baltic Sea are investigated using radiosoundings and lidar measurements. Situations with double-layer structures are also simulated with the regional model REMO in a realistic manner. The double layer consists of two adjacent well-mixed layers, with a sharp inversion in between.

Results from radiosoundings show that the double-layer structure over the Baltic Sea mainly occurs during the autumn with thermally unstable strati. cation near the surface. The structure is present in about 50% of the radiosoundings performed during autumn. The presence of the double-layer structure cannot be related to any specific wind direction, wind speed or sea surface temperature.

The lidar measurements give a more continuous picture of the time evolution of the double-layer structure, and show that the top of the lower layer is not a rigid lid for vertical transport. Two possible explanations of the double-layer structure are given, (i) the structure is caused by 'advection' of land boundary-layer air over the convective marine boundary layer or, (ii) by development of Sc clouds in weak frontal zones connected to low pressure systems. Also the forming of Cu clouds is found to be important for the development of a double-layer structure
Free Keywords:Baltic sea; double-layer structure; marine atmospheric boundary layer; DIFFERENTIAL ABSORPTION LIDAR; WATER-VAPOR; MODEL; TEMPERATURE; FLUXES
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Affiliations:MPI für Meteorologie/Climate Processes/Active Remote Sensing
External Affiliations:Uppsala Univ, Dept Earth Sci Air & Water Sci, Uppsala, Sweden.
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