HR: 0800h
AN: A21C-0864    [Abstracts]
TI: High-Resolution Simulations of the Atmospheric Boundary Layer and Surface-Atmosphere Interactions in the Arctic
AU: * Heinemann, G
EM: gheinemann@uni-bonn.de
AF: Meteorological Institute University Bonn, Auf dem Huegel 20, Bonn, 53121 Germany
AU: Hebbinghaus, H
EM: hebbinghaus@uni-bonn.de
AF: Meteorological Institute University Bonn, Auf dem Huegel 20, Bonn, 53121 Germany
AB: Non-hydrostatic simulations using two mesoscale atmospheric models have been performed for the Arctic with resolutions of 0.5-14 km. The goals of the simulations were twofold: (1) assessment of the snow drift contribution to the accumulation process over Greenland, and (2) study of the boundary layer over the sea ice of the inner Arctic. The interactions between atmosphere and snowpack of Greenland are of high importance for questions of the mass balance of the ice sheet. For goal (1), the operational local model (LM) of the German Meteorological Service is applied for simulations over Greenland at a horizontal resolution of about 14 km. The study focuses on the period 3-12 July 2002, during which an aircraft-based field experiment was performed at the station Summit. LM results are used to drive the snow model SNOWPACK, yielding snow drift fields for the entire area of Greenland. For goal (2), the simulations focus on April 2003, when the aircraft-based experiment ABSIS (Arctic Boundary Layer and Sea Ice Study) took place in the frame of the German ACSYS project. A comprehensive data set was collected including a research aircraft and two ships, allowing the comparison of boundary layer structures with model simulations. LM is run for the period 1-15 April 2003 with a resolution of 9 km, and high-resolution simulations were performed for case studies using the model FOOT3DK (University of Koeln) nested in LM. FOOT3DK is run with resolutions of 2 km and 500 m. Comparisons with the ABSIS data set show a good agreement for the boundary layer structures and near-surface quantities, but also deficiencies of the parameterization schemes in Arctic regions.
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550)
DE: 3349 Polar meteorology
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005