caa a22 4500 469052805 CHVBK 20180323132834.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF01025399 doi (NATIONALLICENCE)springer-10.1007/BF01025399 A three-dimensional numerical sensitivity study of mesoscale circulations induced by circular lakes [Elektronische Daten] [Z. Boybeyi, S. Raman] Summary: A three-dimensional mesoscale planetary boundary layer model with theE-ε turbulence closure is used to simulate airflow over a lake of circular shape. A series of model sensitivity studies are performed to examine the effects of lake-land temperature difference, ambient wind magnitude and direction, lake size, surface roughness, the Coriolis force and baroclinic ambient wind conditions on mesoscale lake circulations. The lake-land temperature difference is essentially the basic energy source driving the mesoscale circulations over the lake on synoptically undisturbed days. A lake-breeze convergence zone is predicted by the model due to the differential heating between the land and the water. It is found that spatial and temporal variations of this convergence zone and associated convection are strongly controlled by the direction and the magnitude of the ambient wind. Under southeasterly and southwesterly ambient winds, the lake-breeze convergence zone and the associated convection occur primarily along up wind and lateral sides of the lake with reference to the general direction of the ambient flow. In contrast to the southeasterly and southwesterly ambient winds, the lake-breeze convergence zone and the convection are predicted all around the coastline of the lake under calm wind. The model also predicts a cloudless region over the lake in all the case studies due to divergent nature of the lake-breeze circulation. The lake size is found to have a significant effect in intensifying convection. Surface roughness over the land surface is found to be important in determining the intensity of the convection. The combined effect of the Coriolis force and the differential surface roughness between land and water appear to be the responsible mechanism for producing the asymmetric shape of the lake-breeze convergence zone around the symmetric circular lake. Finally, it was found that an initial baroclinic flow has different mesoscale lake-breeze circulation patterns as compared to an initial barotropic flow. Springer-Verlag, 1992 Boybeyi Z. Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, 27695-8208, Raleigh, NC, USA aut Raman S. Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, 27695-8208, Raleigh, NC, USA aut Meteorology and Atmospheric Physics Springer-Verlag 49/1-4(1992-03-01), 19-41 0177-7971 49:1-4<19 1992 49 703 https://doi.org/10.1007/BF01025399 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01025399 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Boybeyi Z. Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, 27695-8208, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Raman S. Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, 27695-8208, Raleigh, NC, USA aut NATIONALLICENCE 773 0- Meteorology and Atmospheric Physics Springer-Verlag 49/1-4(1992-03-01), 19-41 0177-7971 49:1-4<19 1992 49 703 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer