Rate of sea level rise in each region (mm/year)Ī trend of sea level rise has been observed in Japanese coastal areas since the 1980s,īut no long-term trend of rise is seen for the period from 1906 to 2020.
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Time-series representation of annual mean sea level anomalies (1960 – 2020) for the four regionsįour-region annual sea level anomaly time series (comma-separated value file: 2 KB) Sea level data from 2011 to 2020 at Hakodate, Fukaura, Kashiwazaki, Tokyo and Hachinohe are not used due to the influence of the 2011 Great East Japan Earthquake. Sea level data for the Tokyo station are available from 1968 onward. The stations at Oshoro, Kashiwazaki, Wajima and Hosojima belong to the Geospatial Information Authority of Japan. These 16 stations are divided into four regions (I – IV) for the latter period. The four stations shown on the map on the left were selected for the period from 1906 to 1959, and the 16 on the right are for the period from 1960 onward. Tide gauge stations assessed as being affected to a lesser extent by crustal movement are selected for monitoring of sea levels. The dashed blue line represents the value at the four stations for the same period shown by the solid red line (from 1960 onward) for reference. While the solid red line represents the corresponding value for the four regions. The solid blue line represents the five-year running mean of annual sea level anomalies averaged among the four stations, The graph indicates annual mean sea level anomalies for each year averaged among the four tide gauge stations shown in the map on the left below for the period from 1906 to 1959,Īnd among the four regions shown in the map on the right below for the period from 1960 onward. The 1981 – 2010 average is used as the normal.Īnnual sea level anomaly time series (comma-separated value file: 3 KB) Time-series representation of annual mean sea level values (1906 – 2020)
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