The long-term variability and its possible mechanism of sea level around the Japan Island

ZHU Xue-ming; DING Guang-jia; BAO Xian-wen; ZHANG Jie

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ZHU Xue-ming, DING Guang-jia, BAO Xian-wen, ZHANG Jie. The long-term variability and its possible mechanism of sea level around the Japan Island[J]. Haiyang Xuebao, 2009, 31(6): 22-30.

Citation:

ZHU Xue-ming, DING Guang-jia, BAO Xian-wen, ZHANG Jie. The long-term variability and its possible mechanism of sea level around the Japan Island[J]. Haiyang Xuebao, 2009, 31(6): 22-30.

ZHU Xue-ming, DING Guang-jia, BAO Xian-wen, ZHANG Jie. The long-term variability and its possible mechanism of sea level around the Japan Island[J]. Haiyang Xuebao, 2009, 31(6): 22-30.

Citation:

ZHU Xue-ming, DING Guang-jia, BAO Xian-wen, ZHANG Jie. The long-term variability and its possible mechanism of sea level around the Japan Island[J]. Haiyang Xuebao, 2009, 31(6): 22-30.

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The long-term variability and its possible mechanism of sea level around the Japan Island

1.
Collage of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;National Marine Environmental Forecasting Center, Beijing 10008, China
2.
Tianjin Research Institute for Water Transport Engineering, Tianjin 300000, China
3.
Collage of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China

Received Date: 2009-02-12
Rev Recd Date: 2009-12-03

Abstract

Abstract

By analyzing the 36 years sea level data in 38 tidal stations around the coast of Japan Island, we obtain the long-term variability of the mean sea levels. The results show that there is a sea levels shift around 1984 with a continious rising trend in recently 20 years. The results also find an obvious downward trend in some stations around 1997, which suggests a long period fluctuation. By averaging the daily mean sea level data from all the tidal stations, the resuts find the sea level has a good correlation of 0.908 with the sea surface temperature (SST) in the northwest Pacific, of -0.6 with the Pacific Decadal Oscillation (PDO) index and of -0.402 with the wind stress curl anomaly in the northwest Pacific Ocean. The above results indicate that the mean sea level long-term variability, around the Japan Island, is influenced by thermal expansion of seawater, Pacific Decadal Oscillation and the winds curl. The northwest Pacific SST is descending since 2000, while the mean sea level continue to rise. The reasons for the sea level rising in the past several years needs future study.
- Japan Island,
- sea level,
- long-term variability,
- PDO

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References(15)

References

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