The intensive radiosonde observations were performed as a research activity of the 43th Japanese Antarctic Research Expeditions (JARE43). We thank Nobuhiko Kizu at Japan Meteorological Agency and the other members of JARE43 for their help with the observations. NCEP–NCAR reanalysis data were used for the analysis of the large-scale atmospheric field. The GFD-DENNOU library was used for drawing figures. We appreciate the valuable comments of two anonymous reviewers. This study is supported by Grant-in-Aid for Scientific Research (A) 19204047 of the Ministry of Education, Culture, Sports and Technology, Japan.
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