Analysis of Variability Temporal-space in the Mean Dynamic Topography (MDT) Using Satellite Altimetry Data and Stations of Permanent Monitoring Network for Geodesy
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Abstract
The technique commonly applied to measure the local variations of the “Mean” Sea Level (NMM) and consequently of the “Mean” Dynamic Topography (MDT), has been based on a geodesic approach, in which tide gauges are installed on the coast oceanic. However, due to the difficulties in maintaining long time series, either due to the lack of financial resources for installation or technical difficulties for the installation of tide gauges or linimetric rulers, the use of altimetric satellite data (SATALT) is seen as an alternative. In view of this, the present study aims to propose a methodology to analyze the monthly variations of MDT based on data (SATALT) and maregraphy. For this purpose, the CryoSat-2 (CS2) mission and maregraphy data from EMFOR, EMSAL and EMIMB stations, all belonging to the Permanent Monitoring Network for Geodesy (PMNG) from February 2011 to September 2019. The results showed that the proposed methodology is feasible and can be used as a complement in tidal data. In a comparative analysis of the local variations of the MDT, it is verified, in general, that there was a more accentuated variation in the data of maregraphy when compared with SATALT, such behavior was visible in all the stations used, except in EMIMB, which presented greater monthly variations in the SATALT technique. Despite the above, the results were satisfactory, explaining an annual discrepancy between the techniques in all tide stations around the millimeters.
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