Seasonal variations of the sea level at Syowa Station

昭和站海平面的季节变化

• 批准号: 04452069
• 负责人: NAGATA Yutaka
• 金额: $ 1.6万
• 依托单位: Mie University (1994)The University of Tokyo (1992-1993)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452069/
• 关键词: Sea level; Syowa Station; seasonal variation; salinity; Katabatic wind; 水位変動; 40日周期; 海流変動

The sea level record at Syowa Station, Antarctica for the period from 1979 to 1988 was analyzed, and the seasonal variations of the sea level and its yearly change were investigated. The level reaches a maximum in early winter and falls to its minimum in mid-summer. The variation pattern is very skewed with flat winter peak and sharp summer trough. The ascending speed in fall is much larger than the descending speed in spring. This variation pattern is just opposite to that of the sea-level in middle latitudes, where the peak occurs in late summer and the trough in mid-winter. The correlation of the sea level change with several oceanographic and meteorological phenomena were studied. The winter peak of sea level is observed in Subarctic North Pacific Ocean and its marginal seas such as in the Okhotsk Sea. This is caused by a salinity decrease in the oceanic surface layr in winter. The salinity variation in the surface layr near Syowa Station indicates that the sea level rise at the very early stage in autumn may be explained by the decrease of salinity of the surface layr, but the main feature of the variation cannot explained. The similar variation pattern is observed in speed change of the Katabatic winds at several coastal stations in east Antarctica. Physical relationship between the sea level and the Katabatic wind speed is not clear in the present stage, but the year-by-year change of the variation pattern found in this study will give a good reference to the future investigations.

本文分析了南极昭和站1979 ~ 1988年的海平面记录，探讨了海平面的季节变化和年际变化。该水平在初冬达到最高值，在仲夏福尔斯降到最低值。冬季峰平、夏季谷陡的变化型是偏态的。秋季的上升速度远大于春季的下降速度。这一变化规律与中纬度地区的海平面变化规律正好相反，中纬度地区的海平面变化在夏末出现峰值，在仲冬出现低谷。研究了海平面变化与几种海洋和气象现象的关系。冬季海平面峰值出现在北太平洋及其边缘海，如鄂霍次克海。这是由于冬季海洋表层的盐度下降造成的。昭和站附近表层盐度的变化表明，秋季极早期海平面的上升可以用表层盐度的下降来解释，但不能解释这种变化的主要特征。东南极沿岸几个站的下降风风速变化具有相似的变化规律。海平面与下降风速之间的物理关系目前尚不清楚，但研究发现的逐年变化规律将为今后的研究提供很好的参考。

项目成果

Y.Nagata: "Seasonal Variation of the sea level at Syowa Station." Proc.of NIPR Symposium on Polar Met.and Glac.7. 60-72 (1993)

Y.Nagata：“昭和站海平面的季节变化。”

Nagata, Y., M.Kawamiya.Y.Michida and M.Odamaki: "Seasonal variations of the sea level at Syowa Station." Proc.of NIPR Symposium on Polar Met.and Glac.7. 60-72 (1993)

Nagata, Y.、M.Kawamiya.Y.Michida 和 M.Odamaki：“昭和站海平面的季节性变化。”

Nagata, Y.: "Formation mechanism of the North Pacific Intermediate Water in the Western Subarctic North Pacific.(in Japanese)" Gekkan-Kaiyo. s-5. 196-204 (1993)

Nagata, Y.：“西亚北极北太平洋北太平洋中间水的形成机制。（日语）”Gekkan-Kaiyo。

Y.Nagata: "Laboratory experiments of dense water descending on continental slope." Deep Ocean Circulation,Elsevier Oceanogr.Series. 59. 333-350 (1933)

Y.Nagata：“稠水降落在大陆坡上的实验室实验。”

L.D.Talley, Y.Nagata, M.Fujimura, T.Iwao, T,Kono, D.Inagake, M.Hirai, and K.Okuda: "North Pacific Intermediate Water in the Kuroshio/0yashio mixed water region." J.Phys.Oceanogr.(in press). (1995)

L.D.Talley、Y.Nagata、M.Fujimura、T.Iwao、T,Kono、D.Inagake、M.Hirai 和 K.Okuda：“黑潮/0yashio 混合水区的北太平洋中层水”。