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  • Ball, F. K., 1960: Winds on the ice slopes of Antarctica. Antarctic Meteorology, Pergamon, 9–16.

  • Blackadar, A. K., 1978: High resolution models of the planetary boundary layer. Advances in Environmental and Scientific Engineering, Vol. 1, J. R. Pfafflin and E. N. Ziegler, Eds., Gordon and Breach, 50–85.

  • Bromwich, D. H., 1986: Surface winds in West Antarctica. Antarct. J. U.S.,21 (5), 235–237.

  • ——, and T. R. Parish, 1988: Mesoscale cyclone interactions with the surface windfield near Terra Nova Bay, Antarctica. Antarct. J. U.S.,23 (5), 172–175.

  • ——, and Z. Liu, 1996: An observational study of the katabaticwind confluence zone near Siple Coast, West Antarctica. Mon. Wea. Rev.,124, 462–477.

  • ——, Y. Du, and T. R. Parish, 1994: Numerical simulation of winter katabatic winds from West Antarctica crossing Siple Coast and the Ross Ice Shelf. Mon. Wea. Rev.,122, 1417–1435.

  • Carrasco, J. F., and D. H. Bromwich, 1993: Mesoscale cyclogenesis dynamics over the southwestern Ross Sea, Antarctica. J. Geophys. Res.,98, 12 973–12 996.

  • ——, and ——, 1995: A midtropospheric subsynoptic-scale vortex that developed over the Ross Sea and Ross Ice Shelf of Antarctica. Antarct. Sci.,7, 199–210.

  • Cerni, T. A., and T. R. Parish, 1984: A radiative model of the stable nocturnal boundary layer with application to the polar night. J. Climate Appl. Meteor.,23, 1563–1572.

  • Drewry, D. J., 1983: The surface of the Antarctic ice sheet. Antarctica: Glaciological and Geological Folio, D. J. Drewry, Ed., Scott Polar Research Institute, sheet 2.

  • Du, Y., and D. H. Bromwich, 1993: Summer surface winds in the Siple Coast confluence zone, West Antarctica. Antarct. J. U.S.,28 (5), 280–282.

  • ——, ——, and T. R. Parish, 1994: Influence of synoptic-scale cyclones on summer surface winds in the Siple Coast confluence zone, West Antarctica. Antarct. J. U.S.,29 (5), 296–298.

  • ——, ——, and ——, 1995: Modeling katabatic winds over West Antarctica. Preprints, Fourth Conf. on Polar Meteorology and Oceanography, Dallas, TX, Amer. Meteor. Soc., 262–267.

  • Egger, J., 1985: Slope winds and the axisymmetric circulation over Antarctica. J. Atmos. Sci.,42, 1859–1867.

  • ——, 1992: Topographic wave modification and the angular momentum balance of the Antarctic troposphere. J. Atmos. Sci.,49, 327–334.

  • Gallée, H., and G. Schayes, 1994: Development of a three-dimensional meso-γ primitive equation model: Katabatic winds simulation in the area of Terra Nova Bay, Antarctica. Mon. Wea. Rev.,122, 671–685.

  • Guymer, L. B., 1986: Procedures and concepts used in Southern Hemisphere analyses at WMC Melbourne. Extended Abstracts,Second Int. Conf. on Southern Hemisphere Meteorology, Wellington, New Zealand, Amer. Meteor. Soc., 10–16.

  • Hines, K. M., D. H. Bromwich, and T. R. Parish, 1995: A mesoscale modeling study of the atmospheric circulation of high southern latitudes. Mon. Wea. Rev.,123, 1146–1165.

  • Holton, J. R., 1992: An Introduction to Dynamic Meteorology. Academic Press, 551 pp.

  • James, I. N., 1986: Katabatic drainage flows over Antarctica and the polar vortex. Extended Abstracts, Second Int. Conf. on Southern Hemisphere Meteorology, Wellington, New Zealand, Amer. Meteor. Soc., 117–118.

  • ——, 1988: On the forcing of planetary-scale Rossby waves by Antarctica. Quart. J. Roy. Meteor. Soc.,114, 619–637.

  • ——, 1989: The Antarctic drainage flow: Implications for hemispheric flow on the Southern Hemisphere. Antarct. Sci.,1, 279–290.

  • Keller, L. M., G. A. Weidner, and C. R. Stearns, 1994: Antarctic automatic weather station data for the calendar year 1992. University of Wisconsin—Madison, 380 pp. [Available from Dept.of Atmospheric and Oceanic Sciences, University of Wisconsin—Madison, 1225 W. Dayton St., Madison, WI 53706.].

  • Kodama, Y., and G. Wendler, 1986: Wind and temperature regime along the slope of Adélie Land, Antarctica. J. Geophys. Res.,91, 6735–6741.

  • ——, ——, and N. Ishikawa, 1989: The diurnal variation of the boundary layer in summer in Adélie Land, eastern Antarctica. J. Appl. Meteor.,28, 16–24.

  • Loewe, F., 1974: Considerations concerning the winds of Adélie Land. Z. Gletscherkd. Glazialgeol.,10, 189–197.

  • May, P. T., and J. M. Wilczak, 1993: Diurnal and seasonal variations of boundary-layer structure observed with a radar wind profiler and RASS. Mon. Wea. Rev.,121, 673–682.

  • Murphy, B. F., and I. Simmonds, 1993: An analysis of strong wind events simulated in a GCM near Casey in the Antarctic. Mon. Wea. Rev.,121, 522–534.

  • Parish, T. R., 1992a: On the interaction between Antarctic katabatic winds and tropospheric motions in the high southern latitudes. Aust. Meteor. Mag.,40, 149–167.

  • ——, 1992b: On the role of Antarctic katabatic winds in forcing large-scale tropospheric motions. J. Atmos. Sci.,49, 1374–1385.

  • ——, and D. H. Bromwich, 1986: The inversion wind pattern over West Antarctica. Mon. Wea. Rev.,114, 849–860.

  • ——, and ——, 1987: The surface windfield over the Antarctic ice sheets. Nature,328, 51–54.

  • ——, and K. T. Waight, 1987: The forcing of Antarctic katabatic winds. Mon. Wea. Rev.,115, 2214–2226.

  • ——, and D. H. Bromwich, 1991: Continental-scale simulation of the Antarctic katabatic wind regime. J. Climate,4, 135–146.

  • ——, P. Pettré, and G. Wendler, 1993a: A numerical study of the diurnal variation of the Adélie Land katabatic wind regime. J. Geophys. Res.,98, 12 933–12 947.

  • ——, ——, and ——, 1993b: The influence of large-scale forcing on the katabatic wind regime at Adélie Land, Antarctica. Meteor. Atmos. Phys.,51, 165–176.

  • ——, D. H. Bromwich, and R.-Y. Tzeng, 1994: On the role of the Antarctic continent in forcing large-scale circulations in the high southern latitudes. J. Atmos. Sci.,51, 3566–3579.

  • Radok, U., 1973: On the energetics of surface winds over the Antarctic ice cap. Energy fluxes over polar surfaces, WMO Tech. Note 129, 299 pp. [Available from World Meteorological Organization, 41, Avenue Giuseppe-Motta, 1211 Geneva 2, Switzerland.].

  • Schwerdtfeger, W., 1984: Weather and Climate of the Antarctic. Elsevier, 261 pp.

  • Simmonds, I., and R. Law, 1995: Associations between Antarctic katabatic flow and the upper level winter vortex. Int. J. Climatol.,15, 403–421.

  • Stearns, C. R., and G. Wendler, 1988: Research results from Antarctic automatic weather stations. Rev. Geophys.,26, 45–61.

  • Streten, N. A., 1963: Some observations of Antarctic katabatic winds. Aust. Meteor. Mag.,42, 1–23.

  • ——, 1968: Characteristics of strong wind periods incoastal East Antarctica. J. Appl. Meteor.,7, 46–52.

  • ——, 1990: A review of the climate of Mawson—A representative strong wind site in east Antarctica. Antarct. Sci.,2, 79–89.

  • Waight, K. T., 1987: The dynamics of Antarctic katabatic winds. Ph.D. dissertation, University of Wyoming, 172 pp. [Available from University Microfilms International, 300 N. Zeeb Road, Ann Arbor, MI 48106.].

  • Yasunari, T., and S. Kodama, 1993: Intraseasonal variability of katabatic wind over East Antarctica and planetary flow regime in the Southern Hemisphere. J. Geophys. Res.,98(D7), 13 063–13 070.

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Dynamics of the Katabatic Wind Confluence Zone near Siple Coast, West Antarctica

Zhong LiuPolar Meteorology Group, Byrd Polar Research Center, and Atmospheric Sciences Program,The Ohio State University, Columbus, Ohio

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David H. BromwichPolar Meteorology Group, Byrd Polar Research Center, and Atmospheric Sciences Program,The Ohio State University, Columbus, Ohio

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Print Publication:
01 Feb 1997
DOI:
https://doi.org/10.1175/1520-0450(1997)036<0097:DOTKWC>2.0.CO;2
Page(s):
97–118
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Abstract

The surface wind pattern over the ice sheets of Antarctica is irregular with marked areas of airflow confluence near the coastal margins. Where cold air from a large interior area of the ice sheet converges (a confluence zone), an anomalously large supply of air is available to feed the coastal katabatic winds, which, as a result, are intensified and more persistent. The confluence zone inland of Siple Coast, West Antarctica, differs from its East Antarctic counterparts in that the terrain slopes become gentler rather than steeper as the coast is approached. In addition, synoptic processes exert substantially more impact on the behavior of the surface winds.

A month-long field program to study the dynamics of the springtime katabatic wind confluence zone has been carried out near Siple Coast. Two sites, Upstream B (83.5°S, 136.1°W) and South Camp (84.5°S, 134.3°W), were established roughly perpendicular to the downslope direction. The field program involved the use of the ground-based remote sensing equipment (sodar and RASS) along with conventional surface and balloon observations. Previous analyses revealed the cross-sectional structure of the confluence zone as consisting of a more buoyant West Antarctic katabatic airflow overlying a less buoyant katabatic airflow originating from East Antarctica.

The force balances inside the confluence zone are here investigated for three situations: mean (all available wind profiles from balloon launches), and two extreme cases (light and strong winds). A linear regression method is used to estimate the mean vertical wind shears and horizontal temperature gradients. The vertical wind shears are used to examine whether or not the airflows are in geostrophic balance. The results are 1) the airflow above the surface at both sites is in geostrophic balance for the three situations; 2) inside the West Antarctic katabatic wind zone, there are three forces in the north–south direction—the restoring pressure gradient force associated with blocking of the katabatic and synoptic winds, the downslope buoyancy force, and the synoptic pressure gradient force associated with the time-averaged low in the South Pacific Ocean; 3) above the West Antarctic katabatic wind layer, the observed easterly wind is due to the synoptic pressure gradient force associated with the low; 4) inside the East Antarctic katabatic wind zone, in addition to the above three forces, there is the downslope buoyancy force associated with the inversion; and 5) large-scale transient synoptic systems strongly influence the downslope wind speed and the boundary layer depth, resulting in the light and strong wind cases.

Corresponding author address: Dr. David H. Bromwich, Byrd Polar Research Center, Atmospheric Sciences Program, The Ohio State University, 108 Scott Hall, 1090 Carmack Rd., Columbus, OH 43210-1002.

bromwich@polarmet1.mps.ohio-state.edu

Abstract

The surface wind pattern over the ice sheets of Antarctica is irregular with marked areas of airflow confluence near the coastal margins. Where cold air from a large interior area of the ice sheet converges (a confluence zone), an anomalously large supply of air is available to feed the coastal katabatic winds, which, as a result, are intensified and more persistent. The confluence zone inland of Siple Coast, West Antarctica, differs from its East Antarctic counterparts in that the terrain slopes become gentler rather than steeper as the coast is approached. In addition, synoptic processes exert substantially more impact on the behavior of the surface winds.

A month-long field program to study the dynamics of the springtime katabatic wind confluence zone has been carried out near Siple Coast. Two sites, Upstream B (83.5°S, 136.1°W) and South Camp (84.5°S, 134.3°W), were established roughly perpendicular to the downslope direction. The field program involved the use of the ground-based remote sensing equipment (sodar and RASS) along with conventional surface and balloon observations. Previous analyses revealed the cross-sectional structure of the confluence zone as consisting of a more buoyant West Antarctic katabatic airflow overlying a less buoyant katabatic airflow originating from East Antarctica.

The force balances inside the confluence zone are here investigated for three situations: mean (all available wind profiles from balloon launches), and two extreme cases (light and strong winds). A linear regression method is used to estimate the mean vertical wind shears and horizontal temperature gradients. The vertical wind shears are used to examine whether or not the airflows are in geostrophic balance. The results are 1) the airflow above the surface at both sites is in geostrophic balance for the three situations; 2) inside the West Antarctic katabatic wind zone, there are three forces in the north–south direction—the restoring pressure gradient force associated with blocking of the katabatic and synoptic winds, the downslope buoyancy force, and the synoptic pressure gradient force associated with the time-averaged low in the South Pacific Ocean; 3) above the West Antarctic katabatic wind layer, the observed easterly wind is due to the synoptic pressure gradient force associated with the low; 4) inside the East Antarctic katabatic wind zone, in addition to the above three forces, there is the downslope buoyancy force associated with the inversion; and 5) large-scale transient synoptic systems strongly influence the downslope wind speed and the boundary layer depth, resulting in the light and strong wind cases.

Corresponding author address: Dr. David H. Bromwich, Byrd Polar Research Center, Atmospheric Sciences Program, The Ohio State University, 108 Scott Hall, 1090 Carmack Rd., Columbus, OH 43210-1002.

bromwich@polarmet1.mps.ohio-state.edu

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