Abstract
Abstract The paper provides an estimate of the latest relative and absolute rates of rise and accelerations of the sea levels for the East Coast of North America. The computation is based on the long-term trend (LTT) tide gauge records of the relative sea levels and the Global Navigation Satellite System (GNSS) time series of the absolute position of fixed dome nearby the tide gauges. The GNSS result is used to infer the subsidence or uplift of the tide gauge instrument. The data of 33 LTT tide stations with more than 80 years of data are shown. The average relative sea-level rise is +2.22 mm/yr. subjected to a small, positive average acceleration of +0.0027 mm/yr2. The average absolute velocity of the tide gauge instruments is −0.52 mm/yr. translating in an average absolute sea-level rise of +1.70 mm/yr. This is the first paper publishing a comprehensive survey of the absolute sea-level rates of rise along the East 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 GNSS antennas that are close to the tide gauges installations.
Highlights
The absolute sea-level rise is computed by correcting the relative sea-level rise measured by a tide gauge instrument by the absolute vertical motion of the instrument, either modeled [1] or measured [2]
The computation is based on the long-term trend (LTT) tide gauge records of the relative sea levels and the Global Navigation Satellite System (GNSS) time series of the absolute position of xed dome nearby the tide gauges
The average absolute velocity of the tide gauge instruments is -0.52 mm/yr. translating in an average absolute sea-level rise of +1.70 mm/yr. This is the rst paper publishing a comprehensive survey of the absolute sea-level rates of rise along the East 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 GNSS antennas that are close to the tide gauges installations
Summary
The absolute sea-level rise is computed by correcting the relative sea-level rise measured by a tide gauge instrument by the absolute vertical motion of the instrument, either modeled [1] or measured [2]. There are requirements for determining the trend, in case of tide gauges length of the period, completeness, quality, and in case of the GNSS antennas, the stability of the solution. SONEL computes the absolute rates of rise of the sea levels from their GNSS data and the tide gauge data from PSMSL. 83 locations are shown worldwide in their latest analysis if a maximum time window 1900 to 2013 is selected. 9 locations are shown along the East Coast of the US and Canada, only Halifax in Canada, 9 locations in the US, Newport, New York, Philadelphia, Atlantic City, Annapolis, Baltimore, Washington DC, Charleston, Key West
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