These benchmarks have been leveled directly to a tide staff on an annual basis, and comparison observations have been made visually at the tide staff on a daily basis in order to relate the data from the tide gauge to the benchmarks via the tide staff. Illustrations Figure 1. Yearly averaged mean sea levels for ten island locations in the Pacific. 1951-92 Table 1. Trends in mean sea level at ten locations in the Pacific Ocean, for the common period of 1955-1992, and for the longest data series at each water level station.
Negative values indicate that sea level is falling relative to the land.
Low-frequency changes in sea level and their possible causes. Sea Levels, Land Levels, and Tide Gauges. Springer-Verlag, New York, 237pp. Geophysics Study Committee of the National Research Council, National Academy Press, Washington, D.C., 234pp. Sea level as an indicator of climate and global change.