Abstract
The aircraft-based experiment KABEG‘97 (Katabatic wind and boundary-layer front experiment around Greenland) was performed in April/May 1997. During the experiment, surface stations were installed at five positions on the ice sheet and in the tundra near Kangerlussuaq, West Greenland. A total of nine katabatic wind flights were performed during quite different synoptic situations and surface conditions, and low-level jets with wind speeds up to 25m s-1 were measured under strong synoptic forcing of the katabatic wind system. The KABEG data represent a unique data set for the investigation of katabatic winds. For the first time, high-resolution and accurate aircraft measurements can be used to investigate the three-dimensional structure of the katabatic wind system for a variety of synoptic situations.
Surface station data show that a pronounced daily cycle of the near-surface wind is present for almost all days due to the nighttime development of the katabatic wind. In a detailed case study the stably-stratified boundary layer over the ice and the complex boundary-layer structure in the transition zone ice/tundra are investigated. The katabatic wind system is found to extend about 10 km over the tundra area and is associated with strong wind convergence and gravity waves. The investigation of the boundary-layer dynamics using the concept of a two-layer katabatic wind model yields the results that the katabatic flow is always a ‘shooting’ flow and that the ‘pure katabatic’ force is the main driving mechanism for the flow regime, although a considerable influence of the large-scale synoptic forcing is found as well.
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References
Ball, F. K.: 1956, ‘The Theory of Strong Katabatic Winds’, Aust. J. Phys. 9, 373-386.
Ball, F. K.: 1960, ‘Winds on the Ice Slopes of Antarctica’, in Antarctic Meteorology, Proceedings of the Symposium, Pergamon Press, pp. 9-16.
Bromwich, D. H.: 1989, ‘An Extraordinary Katabatic Wind Regime at Terra Nova Bay, Antarctica’, Mon. Wea. Rev. 117, 688-695.
Bromwich, D. H., Du, Y., and Parish, T. R.: 1994, ‘Numerical Simulation of Winter Katabatic Winds from West Antarctica Crossing Siple Coast and the Ross Ice Shelf’, Mon. Wea. Rev. 122, 1417-1435.
Bromwich, D. H., Du, Y., and Hines, K. M.: 1996, ‘Wintertime Surface Winds over the Greenland Ice Sheet’, Mon. Wea. Rev. 124, 1941-1947.
Ekholm, S.: 1996, ‘A Full Coverage, High-Resolution, Topographic Model of Greenland Computed from a Variety of Digital Elevation Data’, J. Geophys. Res. B10, 21961-21972.
Gallée H. and Duynkerke, P. G.: 1997, ‘Air-Snow Interactions and the Surface Energy and Mass Balance over the Melting Zone of West Greenland during the Greenland Ice Margin Experiment’, J. Geophys. Res. 102, 13813-13824.
Gosink, J.: 1982, ‘Measurements of the Katabatic Winds between Dome C and Dumont d'Urville’, Pageoph. 120, 503-526.
Heinemann, G.: 1996, ‘Katabatic Wind Systems over Polar Ice Sheets’, in Proceedings 6th Workshop on Mass Balance of the Greenland Ice Sheet and Related Topics, 22–23 January 1996, Copenhagen, Denmark. Published by The Geological Survey of Greenland, Copenhagen, Report No. 53, pp. 39-43.
Heinemann, G.: 1998, ‘Katabatic Wind and Boundary-Layer Front Experiment around Greenland (KABEG) Field Phase Report’, Reports on Polar Research 269, Alfred-Wegener-Institute for Polar Research, Bremerhaven, FRG, 93 pp.
Heinemann, G.: 1997, ‘Idealized Simulations of the Antarctic Katabatic Wind System with a Three-Dimensional Meso-Scale Model’, J. Geophys. Res. 102, 13825-13834.
Kodama, Y., Wendler, G., and Ishikawa, N.: 1989, ‘The Diurnal Variation of the Boundary Layer in Summer in Adelie Land, Eastern, Antarctica’, J. Appl. Meteorol. 28, 16-24.
Meesters, A.: 1994, ‘Dependence of the Energy Balance of the Greenland Ice Sheet on Climatic Change: Influence of the Katabatic Wind and Tundra’, Quart. J. Roy. Meteorol. Soc. 120, 491-517.
Oerlemans, J. and Vugts, H.: 1993, ‘A Meteorological Experiment in the Ablation Zone of the Greenland Ice Sheet’, Bull. Amer. Meteorol. Soc. 74, 355-365.
Parish, T. R. and Bromwich, D. H.: 1989, ‘Instrumented Aircraft Observations of the Katabatic Wind Regime near Terra Nova Bay’, Mon. Wea. Rev. 117, 1570-1585.
Pettré, P. and André, J.-C.: 1991, ‘Surface-Pressure Change through Loewe's Phenomena and Katabatic Flow Jumps: Study of Two Cases in Adélie Land, Antarctica’, J. Atmos. Sci. 48, 557-571.
Phillpot, H.: 1997, ‘Some Observationally-Identified Meteorological Features of East Antarctica’, Meteorological Study No. 42, Bureau of Meteoroloy, Canberra, Australia, 275 pp.
Putnins, P.: 1970, ‘The Climate of Greenland’, in S. Orvig (ed.), Climates of the Polar Regions World Survey of Climatology, Volume 14, pp. 3-113.
Rasmussen, L.: 1989, ‘Greenland Winds and Satellite Imagery’, Vejret, Danish Meteorological Society, pp. 32-37.
Schwerdtfeger, W.: 1984, Weather and Climate of the Antarctic, Elsevier Science Publishers, 261 pp.
Sorbjan, Z., Kodama, Y., and Wendler, G.: 1986, ‘Observational Study of the Atmospheric Boundary Layer over Antarctica’, J. Clim. Appl. Meteorol. 25, 641-651.
Van den Broeke, M. R., Duynkerke, P. G., and Oerlemans, J.: 1994a, ‘The Observed Katabatic Flow at the Edge of the Greenland Ice Sheet during GIMEX-91’, Global Planetary Change 9, 3-15.
Van den Broeke, M. R., Duynkerke, P. G., and Henneken, E. A. C.: 1994b, ‘Heat, Momentum and Moisture Budgets of the Katabatic Layer over the Melting Zone of the West Greenland Ice Sheet in Summer’, Boundary-Layer Meteorol. 71, 393-413.
Wendler, G.: 1990, ‘Strong Gravity Flow Observed along the Slope of Eastern Antarctica’, Meteorol. Atmos. Phys. 43, 127-135.
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Heinemann, G. The KABEG’97 field experiment: An aircraft-based study of katabatic wind dynamics over the Greenland ice sheet. Boundary-Layer Meteorology 93, 75–116 (1999). https://doi.org/10.1023/A:1002009530877
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DOI: https://doi.org/10.1023/A:1002009530877