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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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