Changes between Version 2 and Version 3 of imuk/projects/2010_03

Timestamp:

Sep 30, 2010 10:33:30 AM (14 years ago)

Author:

gryschka

Comment:

--

imuk/projects/2010_03

@@ -3 +3 @@
 Responsible: Christof Lüpkes, Siegfried Raasch, Micha Gryschka \\
 Project type: [[http://www.dfg.de|DFG]] research project\\
-Duration: 2010-2013\\
+Duration: 2010-2013\\ \\
+The interaction between atmospheric processes in polar and mid-latitude regions is strongly
+affected by cold-air outbreaks (CAOs). During such events cold air originating from (sea)ice
+covered regions is transported over large distances towards lower latitudes, while over open
+water a shallow but strongly heated convective boundary layer develops. Although the present
+generation of weather and regional climate models captures CAOs qualitatively well, there
+are deficiencies caused by uncertainties in the representation of the multi scale physical CAO
+processes in models. Open questions concern e.g., the generation of rolls under conditions
+of strong thermal forcing over the open and partially ice covered ocean and under non-
+stationary synoptic conditions. Other questions are related to the parameterization of the
+strong turbulent fluxes, especially in coarse grid resolution. Hence this project aims to study
+the physical processes in polar CAOs with roll vortices using large eddy simulation (LES) and
+mesoscale modelling. Furthermore, parameterizations of turbulence in CAOs will be improved
+with a focus on the most modern low order closures and their applicability to regional scale
+models. To this end current and new closures are used in a mesoscale model with different
+resolutions and its results are compared with observations and with the results of LES.