Producción CyT
Abstract book - The role of Steric height in mesoscale activity in the Southwestern Atlantic Ocean derived from high resolution in situ data, satellite altimetry and a reanalysis model.
Congreso
Fecha:
2024Editorial y Lugar de Edición:
ESA, CNESResumen *
The sea surface Height (SSH) has two main components: one is related to the mass change (e.g. remotion/addition of water) and the other component, known as the Steric Height (SH), originates from fluctuation in water density. The study of the SH in mesoscale processes, that occur on a spatial scale of hundreds of kilometers and on a time scales of days to weeks, is crucial. It provides insights into how density variations impact ocean circulation, which affects the energy distribution, and nutrient transport. This study investigates the role of SH in the mesoscale processes in the Southwestern Atlantic Ocean using high-resolution in situ data collected by elephant seals, satellite altimetry and an ocean reanalysis model during September to December 2018 and 2019. The mesoscale eddy trajectory atlas product from AVISO was used for the selection of the anticyclonic and cyclonic eddies that matched with the period of the Elephant Seals trajectories. This study also uses the ocean reanalysis model, Glorys 12, from the European Union’s Earth observation program CMEMS (Copernicus Marine Service). We extracted the vertical profiles of in situ and model data inside and outside the eddies to compare both datasets. The basic variables, Temperature (T) and Salinity (S), of the reanalysis data correlated well with in situ data, especially inside eddies. The correlation coefficient was 0.9 for T in anticyclonic and cyclonic eddies and the correlation values were 0.7 for anticyclonic eddies and 0.5 to cyclonic eddies for S. Outside the eddies, in the surrounding ocean, the correlation was 0.8 for T and 0.6 for S. The high correlation between both datasets couraged us to calculate the SH inside eddies using T/S vertical profiles. The SH derived from the model represented adequately the SH derived from in situ data obtaining a significant correlation of 0.78 for anticyclonic eddies and 0.52 for cyclonic eddies. Therefore, the GLORYS 12 reanalysis model resolves the SH in the mesoscale eddies in the Southwestern Atlantic. From here, we will explore the differences of the SH on anticyclonic and cyclonic eddies and how much is its contribution to sea level. A similar analysis will be done incorporating the Argos buoys, other independent in situ data set. Información suministrada por el agente en SIGEVAPalabras Clave
MESOSCALE EDDYOCEAN REANALYSIS MODELSTERIC HEIGHTELEPHANT SEALS