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Stephan de Wekker Assistant Professor |
M.S.: Soil, Water, Atmosphere, W
main research areas: Boundary-layer meteorology, mountain meteorology, mesoscale modeling, land-atmosphere interactions
Landscape heterogeneities can have pronounced effects on atmospheric boundary layer processes. Examples include a modification of the boundary layer growth and the generation of mesoscale circulations. My research focuses primarily on the investigation of these processes in hilly and mountainous terrain using a combination of field studies, data analysis, and numerical modeling techniques. I seek to apply my expertise to problems in a multi-disciplinary context such as found at the interface with ecology, atmospheric chemistry, and hydrology. Examples include the venting and regional transport of aerosols and the estimation of regional CO2 fluxes.
De Wekker, S.F.J., and S. D. Mayor, 2008: Observations of atmospheric structure and dynamics in the Owens Valley of California with a ground-based, eye-safe, scanning aerosol lidar. Submitted to J. Appl Meteor. Climat. 5/7/2008
De Wekker, S.F.J., 2008: Observational and numerical evidence of depressed convective boundary layer heights near a mountain base. J. Appl Meteor. Climat. 47, 1017–1026.
Zhong, S., J. Li, C. B. Clements, S.F.J. De Wekker, and X. Bian, 2008: Forcing mechanisms for Washoe Zephyr - a daytime downslope wind system in the lee of the Sierra Nevada. J. Appl Meteor. Climat. 47, 339-350. PDF
Whiteman, C.D., S.F.J. De Wekker and T. Haiden, 2007: Effect of dewfall and frostfall on nighttime cooling in a small closed basin. J. Appl. Meteor. Climat., 46, 3–13. PDF
De Wekker, S.F.J. and C.D. Whiteman, 2006: On the timescale of nocturnal boundary layer cooling in valleys, basins, and over plains. J. Appl. Meteor. Climat., 45, 813–820.PDF
De Wekker, S.F.J., D.G. Steyn, J.D. Fast, M.W. Rotach, and S. Zhong, 2005: The performance of RAMS in representing the convective boundary layer structure in a very steep valley. Env. Fluid Mech.5, 35-62. PDF
De Wekker, S.F.J., D.G. Steyn, and S. Nyeki, 2004: A comparison of aerosol layer- and convective boundary layer structure over a mountain range during STAAARTE ’97. Bound.-Layer Meteor. 113, 249-271. PDF
Rotach, M.W, P. Calanca, R. Vogt, D.G. Steyn, G. Graziani, M. Andretta, A.Christen, S. Cieslik, R. Conolly, S.F.J. De Wekker, S. Galmarini, E. van Gorsel, J. Gurtz, E. Kadygrov, V. Kadygrov, E. Miller, B. Neininger, M. Rucker, H. Weber, A. Weiss , M. Zappa, 2004: The turbulence structure and exchange processes in an Alpine Valley: The MAP-Riviera project. Bull. Amer. Meteor. Soc.85, 1367-1385. PDF
Henne, S., M. Furger, S. Nyeki, M. Steinbacher, B. Neininger, S.F.J. De Wekker, J. Dommen, N. Spichtinger, A. Stohl, A. S. H. Prévôt, 2004: Quantification of topographic venting of boundary layer air to the free troposphere. Atmos. Chem. Phys.,4, 497-509. PDF
Nyeki, S., M. Kalberer, I. Colbeck, S.F.J. De Wekker, M. Furger, H.W. Gäggeler, M. Kossmann, M. Lugauer, D. Steyn, E. Weingartner, M. Wirth, and U. Baltensperger, 2000: Convective Boundary Layer Evolution to 4 km asl over High-Alpine Terrain: Airborne Lidar observations in the Alps. Geophys. Res. Lett.,27, 689-692. PDF
Nyeki, S., S.F.J. De Wekker, D. Steyn, M. Kossmann, M. Kalberer, I. Colbeck and U. Baltensperger, 1999: Airborne lidar study of convective boundary layer development over pre-alpine terrain, J. of Aerosol Science,30, 209-210. PDF
Kossmann, M., U. Corsmeier, S.F.J. De Wekker, F. Fiedler, R. Vögtlin, N. Kalthoff, H. Güsten, and B. Neininger, 1999. Observations of handover processes between the atmospheric boundary layer and the free troposphere over mountainous terrain. Contrib. Atmos. Phys. , 72, 329-350. PDF
De Wekker, S.F.J., S. Zhong, J.D. Fast, and C.D. Whiteman, 1998: A numerical study of the thermally driven plain-to-basin wind over idealized basin topographies. J. Appl. Meteor., 37, 606-622. PDF
Doran, J.C., X. Bian, S.F.J. De Wekker, S. Edgerton, J.D. Fast, J.M. Hubbe, W.J. Shaw, C. D. Whiteman, S. Abbott, C. King, J. Leach, M. Mulhearn, C. Russell, B. Templeman, D. Wolfe, J. Archuleta, S. Elliott, A. Fernandez, D. Langley, J.T. Lee, W. Porch, L. Tellier, J. Chow, J.G. Watson, R.L. Coulter, T.J. Martin, J.D. Shannon, R. White, D. Martinez, J.L. Martinez, V. Mora, G. Sosa, G. Mercado, J.L. Pena, R. Salas, R. Petty, 1998: The IMADA-AVER Boundary Layer Experiment in the Mexico City Area . Bull. Amer. Meteor. Soc. , 79, 2497–2508. PDF
Ph.D. thesis:
De Wekker, S. F. J.: 2002, Structure and Morphology of the Convective Boundary Layer in Mountainous Terrain, Ph.D. Dissertation, The University of British Columbia, BC, Canada, 191 pp. [main text + appendix]
EVSC 350: Atmosphere and Weather [instructional toolkit web page]
EVSC 495/795: Mountain Weather and Climate