Details

Autor(en) / Beteiligte

• Billings, B J
• Grubi, V
• Borys, R D

Titel

MAINTENANCE OF A MOUNTAIN VALLEY COLD POOL AND THERMAL BELT: A NUMERICAL STUDY

Ist Teil von

• Hrvatski meteorološki časopis, 2005-01, Vol.40, p.445-448

Erscheinungsjahr

2005

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• A mountain valley cold pool was simulated with the Pennsylvania State University-National Center for Atmospheric Research Mesoscale Model version 5 (MM5) to determine the effects of snow cover, planetary boundary layer (PBL) parameterizations, spin-up time, vertical and horizontal resolution, and horizontal diffusion on the maintenance of a cold pool. The simulation was of a cold pool that remained in the Yampa Valley of northwestern Colorado throughout 10 January 2004. Results of model runs were verified by a mesonetwork of weather stations located on the western slope of the valley. The presence of snow cover improved the simulation results, but was not sufficient to retain the cold pool in the valley. Increasing the model spin-up time, vertical resolution, and the PBL parameterization had little effect on the model results. However, increasing the horizontal resolution from 1 km to 100 m did improve the results and retained a weak inversion in the valley. Using the horizontal diffusion scheme of Zaengl (2002) had an effect similar to that achieved by increasing the horizontal resolution.