engleski

Anthropogenic influence on mesoscale weather – an example of construction of the man-made lake

The mesoscale Weather Research and Forecasting (WRF) model (Version 3.3) was used in order to assess possible modifications of the surface meteorological conditions due to construction of a small, man-made lake in midlatitudes. WRF was applied to four real typical synoptic situations for which the area of interest was under the influence of a wintertime anticyclone, summertime anticyclone, wintertime cyclone and a summertime cyclone. Each of these four real synoptic setups was simulated twice – once with assuming the present state and again with assuming the existence of the new lake. To better represent complex topography and other surface characteristics of investigated heterogeneous area, double-nested simulations with three domains were performed, where results obtained at the finest horizontal resolution (1 km) were considered relevant. Results showed noticeable changes in the surface temperature and relative humidity as well as a small increase of the mean surface wind speeds in the air above the newly constructed lake. At other portions of the investigated area average differences produced by the new lake were neglectable. However, in individual hours, the differences were occasionally quite high, especially for cyclonic episodes. Finally, results suggest a slight enhancement of slope winds produced by existence of a new lake.

mesoscale; surface conditions; cyclone; anticyclone

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