Some Characteristics of Turbulence in Katabatic Winds over Mizuho Plateau, East Antarctica (Special Issue of the Proceedings of the First Symposium on Antarctic Meteorology and Glaciology)

• Main Authors: 小林 俊一, 石田 完, Shun'ichi KOBAYASHI, Tamotsu ISHIDA
• Format: Report
• Language: English
• Published: 北海道大学低温科学研究所 1979
• Subjects: 551.5; Antarctic; East Antarctica; Mizuho; Yamato; Mizuho Station; Mizuho Plateau; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=8096; http://id.nii.ac.jp/1291/00008096/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=8096&item_no=1&attribute_id=18&file_no=1

超音波風速計による斜面滑降風(katabatic wind)の乱流特性が調べられた.観測地点は,みずほ基地の雪原上とやまと裸氷原上の2点であり,前者は,定常的な斜面滑降風域,後者は斜面滑降風のハイドロリックシャンプ(hydraulic jump)域として特徴づけられる.2つの地域の乱流特性の差は,自己相関係数から計算した特性時間スケールとパワースペクトルに著しく表れた. Wind turbulence was observed, using sonic anemometers, on a snow surface at Mizuho Station (2230 m above sea level, Lat. 70°41.9'S, Long. 44°19.9'E) and on a bare ice field near the Yamato Mountains (1700 m above sea level, Lat. 71°18'S, Long. 35゜40'E) in the Mizuho Plateau in 1973 by the party of the 14th Japanese Antarctic Research Expedition (JARE-14). Observations revealed, as to katabatic winds blowing above the two places, that the one above the latter is characterized by the presence of a hydraulic jump generated by nunataks there, resulting in a stronger turbulence than the one above the former which is stationary. Hence, a comparison is made in this paper between characteristics of turbulence and a hydraulic jump in a katabatic wind