Comparison of the Seasonal Meteorological Variations between Mizuho and Syowa Stations, Antarctica in 1977

• Main Authors: Nakajima, Chotaro, Inoue, Jiro, Fujii, Yoshiyuki
• Language: English
• Published: 1981
• Subjects: Mizuho; Mizuho Station; Syowa Station; Antarc*; Antarctica; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/record/1183/files/KJ00000011709.pdf

P(論文) On the basis of surface meteorological records obtained at Mizuho Station (44°20′E, 70°42′S, 2230m a. s. l.) and Syowa Station (39°35′E, 69°00′S, 20.7m a. s. l.) in 1977,a preliminary study is done on the comparison of seasonal meteorological variations between those stations. Similar tendencies are seen in the surface pressure variations at both stations throughout the year, indicating that both stations are under the same air pressure field. The most obvious difference of meteorological conditions between both stations appears in the wind speed variation, that is, a yearlong, especially in winter, strong cold katabatic wind at Mizuho Station and the prevailing wind from the NE, which is strengthened under the influence of synoptic scale disturbance, at Syowa Station. From the spectrum analysis of wind speed and air temperature records, the period of 15 days is predominant in the air temperature variation at Syowa Station and in the wind speed variation at both stations. The periodicities correspond to these of the predominant synoptic scale disturbances. From the viewpoint of synoptic meteorological conditions at both stations, the seasons are classified into summer from November to February, winter from May to August and the intermediate seasons. The summer season is characterized by less disturbed conditions and regular daily variations of wind speed and air temperature. In the intermediate seasons, synoptic scale disturbances prevail and the influences appear in the variations of wind speed at Syowa Station and air temperature at both stations, being much more at Mizuho than at Syowa, that is, the increase of both elements. The number of snowfall days also increases in the intermediate seasons. In winter, regular daily variations completely disappear and weekly to semi-monthly periods are predominant in the synoptic scale disturbances. departmental bulletin paper