Sea Level Estimates in South America from Tide Gauge Records and SIRGAS-CON Coordinates
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Abstract
In this study, the relative sea level rate was evaluated in 20 maregraphic stations, with monthly data from the Permanent Service for Mean Sea Level (PSMSL), in South America. To estimate the crustal vertical movement, 12 stations from the Global Navigation Satellite System (GNSS) of the Geocentric Reference System for the Americas (SIRGAS-CON) continuous monitoring network, which is located near the tide gauge at a maximum distance of 10km. With the knowledge of vertical variation, it was possible to obtain the absolute sea level rate for 12 sea stations. Statistical analysis was performed by linear regression (trend line) and quadratic polynomial regression (acceleration). Thus, in South America, the average rate of change in absolute sea level resulted in 0.98 mm/year ± 0.93 mm/year for an average period from 1950 to 2018.
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