Abstract
AbstractThe research issue of which are the present relative and absolute rates of rise and accelerations for North America is here addressed. The data of the 20 long-term-trend (LTT) tide stations of the West Coast of North America with more than 80 years of recorded data are shown. The absolute rates of rise are computed by considering the absolute vertical velocity of Global Navigation Satellite System (GNSS) antennas near the tide gauges, and the relative rate of sea-level rise from the tide gauge signals. The 20 LTT stations along the West Coast of North America show an average relative rate of rise of -0.38 mm/yr., an average acceleration of +0.0012 mm/yr2, and an average absolute rate of rise of +0.73 mm/yr. This is the first paper publishing a comprehensive survey of the absolute sea-level rates of rise along the West Coast of North America using the reliable information of relative sea-level rates of rise from LTT tide gauges plus the absolute subsidence rates from different GNSS antennas close to the tide gauge installations.
Highlights
Because sea levels oscillate with well-known periodicities in the 60-year range, like other climate parameters [1, 2], more than 60 years of continuous recording from the same tide gauge, without any major perturbation, are needed to compute a reliable slope by linear fitting, and more than 90 years are needed to compute a reliable acceleration by parabolic fitting
The absolute rates of rise are computed by considering the absolute vertical velocity of Global Navigation Satellite System (GNSS) antennas near the tide gauges, and the relative rate of sea-level rise from the tide gauge signals
The 20 Long Term Trend (LTT) stations along the West Coast of North America show an average relative rate of rise of -0.38 mm/yr., an average acceleration of +0.0012 mm/yr2, and an average absolute rate of rise of +0.73 mm/yr. This is the first paper publishing a comprehensive survey of the absolute sea-level rates of rise along the West Coast of North America using the reliable information of relative sea-level rates of rise from LTT tide gauges plus the absolute subsidence rates from different GNSS antennas close to the tide gauge installations
Summary
Because sea levels oscillate with well-known periodicities in the 60-year range, like other climate parameters [1, 2], more than 60 years of continuous recording from the same tide gauge, without any major perturbation, are needed to compute a reliable slope by linear fitting, and more than 90 years are needed to compute a reliable acceleration by parabolic fitting. There are 20 Long Term Trend (LTT) tide stations along the West Coast of North America, from Alaska to Panama. The measured monthly average mean sea levels (MSL) relative to the tide gauge instrument are given by the Permanent Service for Mean Sea Level (PSMSL) [3]. Analyses of these data are offered by different providers such as PSMSL, sealevel.info [4], National Oceanic and Atmospheric Administration (NOAA) [5], Système d’Observation du Niveau des Eaux Littorales (SONEL) [6].
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