Long-term and seasonal changes of the mean sea level at Syowa Station, Antarctica, from 1981 to 2000
スポンサーリンク
概要
- 論文の詳細を見る
Sea level has been observed since 1966 at Syowa Station, a Japanese Antarctic station located on East Ongul Island(39.6°E , 69.0°S ). An almost continuous record has been obtained from 1981 to 2000 and analyzed to investigate long-term and seasonal changes of mean sea level. After correction of year-to-year variation of the datum, it is found that the annual mean sea level has been falling at a rate of 1.2cm/year. This rate is bigger than previous estimations calculated from shorter records of sea level without appropriate datum adjustment, and also bigger than that expected from geological evidence. Based on discussion of the reasons for the trend, it is suggested that glacial rebound can not be excluded as the cause. The present analysis based on a long record for about 20years also provides the amplitude(2.7cm) and phase of the nodal tide with the period of 18.6years. Characteristics of the seasonal change for the first half of the record(1981-1989) are different from those for the second half(1990-2000), associated with replacement of the observing system in 1990. Comparing with seasonal changes at other Antarctic stations and considering the results of previous studies, it is concluded that the seasonal change observed in the second half is more reliable, and that it reaches its maximum in April and minimum in October with an estimated annual tidal range of about 14cm.
- 国立極地研究所の論文
著者
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Michida Yutaka
Ocean Research Institute, The University of Tokyo, 1-15-1 Minamidai, Nakano, Tokyo 164-8639, Japan.
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Odamaki Minoru
Hydrographic and Oceanographic Department, Japan Coast Guard, 5-3-1 Tsukiji, Chuo-ku, Tokyo 104-0045
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Kinoshita Hideki
Hydrographic and Oceanographic Department, Japan Coast Guard
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Michida Yutaka
Ocean Research Institute The University Of Tokyo
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Tateoka Atsushi
Ocean Research Institute, The University of Tokyo
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Namiki Masaharu
Hydrographic Department, Japan Coast Guard
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Odamaki Minoru
Hydrographic And Oceanographic Department Japan Coast Guard 5-3-1 Tsukiji Chuo-ku Tokyo 104-0045 Jap
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Odamaki Minoru
Hydrographic Department Japan Coast Guard
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Kinoshita Hideki
Hydrographic And Oceanographic Department Japan Coast Guard
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Kinoshita Hideki
Hydrographic Department Japan Coast Guard
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Namiki Masaharu
Hydrographic Department Japan Coast Guard
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Tateoka Atsushi
Ocean Research Institute The University Of Tokyo
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