Abstract
During the XXII Italian expedition in Antarctica, in the summer of 2007, severe weather conditions associated with deep convective instability and heavy coastal precipitation occurred around the Terra Nova Bay area in the presence of an upper level trough and energetic katabatic winds flowing from the Ross Ice Shelf over the open sea. In this case study we document an example of boundary-layer frontal movement across the Ross Sea and mesocyclone development in conjunction with the frontal movement. A westward fast moving boundary-layer front, generated by the leftward turning katabatic airstream to the east of Ross Island, was observed propagating as a baroclinic wave disturbance in an easterly direction across the Ross Sea, merging later with a mesocyclone approaching Terra Nova Bay from offshore. The observed inertial trajectory and an estimation of the radius of curvature suggest that the vigorous katabatic airstream was sustained by the strengthening of a surface mesocyclonic circulation settled over the north-eastern Ross Ice Shelf, triggered by a sub-synoptic upper level trough passing over the area. We hypothesise that baroclinic instability in the low levels plays an important role in the development of a mesoscale vortex and for triggering convective precipitation.
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References
Adams AS, Tripoli GJ (2003) Use of the UW-NMS to simulate the flow around Ross Island on 3 September 2003. In: Antarctic Automatic Weather Station Annual Meeting, Antarctic Meteorological Research Center Annual Meeting, and Antarctic Mesoscale Prediction System (AMPS) Users’ Workshop. Joint Annual Meetings, Charleston, SC, 8–10 June 2004. Preprints. S.l., 2004, pp 20–22
Bromwich DH (1986) Boundary layer meteorology of the western Ross Sea. Antarct J 21(5): 237–240
Bromwich DH (1989a) Satellite analyses of Antarctic katabatic wind behavior. Bull Am Meteorol Soc 70: 738–749
Bromwich DH (1989b) An extraordinary katabatic wind regime at Terra Nova Bay. Antarct Mon Weather Rev 117: 688–695
Bromwich DH (1990) Organization of clouds and precipitations in extratropical cyclones. In: Newton CW, Holopainen EO (eds) Extratropical cyclones: the Erik Palmén Memorial volume. American Meteorological Society, Boston, MA, pp 129–153
Bromwich DH (1991) Mesoscale cyclogenesis over the southwestern Ross Sea linked to strong katabatic winds. Mon Weather Rev 119: 1736–1752
Bromwich DH, Carrasco JF, Stearns CR (1992) Satellite observations of katabatic wind propagation for great distances across the Ross Ice Shelf. Mon Weather Rev 120: 1940–1949
Businger S (1985) The synoptic climatology of polar low outbreaks. Tellus 37: 419–432
Carrasco JF, Bromwich DH (1993) Mesoscale cyclogenesis dynamics over the Southwestern Ross Sea, Antarctica. J Geophys Res 98(D7): 12973–12995
Carrasco JF, Bromwich DH (1994) Climatological aspects of mesoscale cyclogenesis over the Ross Sea and Ross Ice Shelf regions of Antarctica. Mon Weather Rev 122: 2405–2425
Carrasco JF, Bromwich DH (1995) A case study of a midtropospheric subsynoptic-scale cyclone that developed over the Ross Sea and Ross Ice Shelf of Antarctica. Antarct Sci 7(2): 199–210
Carrasco JF, Bromwich DH (1996) Mesoscale cyclone activity near Terra Nova Bay and Byrd Glacier, Antarctica during 1991. Glob Atmos Ocean Syst 5: 43–72
Carrasco JF, Bromwich DH, Liu Z (1997) Mesoscale cyclone activity over Antarctica during 1991, part 2: near the Antarctic peninsula. J Geophys Res 102(D12): 13939–13954
Carrasco JF, Bromwich DH, Monaghan Andrew J (2003) Distribution and characteristics of mesoscale cyclones in the Antarctic: Ross Sea eastward to the Weddell Sea. Mon Weather Rev 131: 289–301
Craig G, Cho R (1989) Baroclinic instability and CISK as the driving mechanisms for polar lows and comma clouds. In: Twitchell PT, Rasmussen EA, Davidson KL (eds) Polar and Arctic Lows. A. Deepak, Hampton, VA, pp 131–153
Emanuel KA, Rotunno R (1989) Polar lows as arctic hurricanes. Tellus 41A: 1–17
Fett RW (1989) Polar low development associated with boundary layer fronts in the Greenland, Norwegian, and Barents seas. In: Twitchell PF, Rasmussen EA, Davidson KL (eds) Polar and Arctic Lows. A. Deepak Publishing, Hampton, VA, pp 312–322
Gallée H. (1995) Simulation of mesocyclonic activity in the Ross Sea, Antarctica. Mon Weather Rev 123: 2051–2069
Gallée H. (1996) Mesoscale atmospheric circulation over the southwestern Ross Sea sector, Antarctica. Am Meteorol Soc 35: 1129–1141
Heinemann G, Klein T (2003) Simulations of topographically forced mesocyclones in the Weddell Sea and the Ross Sea region of Antarctica. Mon Weather Rev 131: 302–316
Monaghan AJ, Bromwich DH, Powers JG, Manning KW (2005) The climate of the McMurdo, Antarctica, region as Represented by One year of forecasts from the Antarctic Mesoscale Prediction System. J Clim 18: 1174–1189
Moore GWK, Renfrew IA (2005) Tip jets barrier winds: a quikSCAT climatology of high wind speed events around Greenland. J Clim 18: 3713–3725
O’Connor WP, Bromwich DH (1988) Surface airflow around Windless Bight, Ross Island, Antarctica. Q J Roy Meteorol Soc 114: 917–938
Parish T, Schwerdtfeger W (1977) A cold low-level jet stream in the Bransfield Strait: an example of inertial flow. Antarct J US 12: 171–172
Parish T, Bromwich DH (1987) The surface wind field over the Antarctic ice sheets. Nature 328: 51–54
Parish T, Bromwich DH (1988) Mesoscale cyclone interactions with the surface wind field near Terra Nova Bay. Antarct J US 23: 172–175
Parish T, Bromwich DH (1991) Continental-scale simulation of the Antarctic katabatic wind regime. J Clim 4: 135–146
Rasmussen E (1979) The polar low as an extratropical CISK disturbance. Q J Roy Meteorol Soc 105: 531–549
Schwerdtfeger W (1984) Weather and climate of the Antarctic. In: Orvig S (eds) Climate of the polar regions, World Survey Climatology, vol 14. Elsevier, New York, pp 253–355
Seefeldt MW, Tripoli GJ, Stearns CR (2003) A high-resolution numerical simulation of the wind flow in the Ross Island region, Antarctica. Mon Wea Rev 131: 435–458
Slotten HR, Stearns CR (1987) Observations of the dynamics and kinematics of the atmospheric surface layer on the Ross Ice Shelf, Antarctica. J Clim Appl Meteor 26: 1731–1743
Steinhaff DF, Bromwich DH, Lambertson M, Knuth S, Lazzara MA (2008) A dynamical investigation of the May 2004 McMurdo Antarctica severe wind event using AMPS. Mon Weather Rev 136(1): 7–26
Acknowledgments
Satellite images and AWS data were provided by the Antarctic Meteorological Research Center, University of Wisconsin-Madison (thanks to Matthew Lazzara and Jonas Asuma). Italian AWS data and high resolution satellite images were provided by PNRA-ENEA. We are grateful to Andrea Pellegrini for useful suggestiosns and contributions. Grid data were obtained from MARS archive (European Centre for Medium-Range Weather Forecast, Reading-UK). Support from the PNRA library is appreciated.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Bove, R., Paolo, G. Convective Snowfalls Linked to the Interaction of a Boundary-Layer Front with a Mesoscale Cyclone Near Terra Nova Bay, Antarctica. Boundary-Layer Meteorol 131, 465–478 (2009). https://doi.org/10.1007/s10546-009-9374-6
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DOI: https://doi.org/10.1007/s10546-009-9374-6