Análise do transporte de sal no Canal de Moçambique a partir de diferentes estimativas

Abstract

The characteristics of the transferred water masses, that is, the concentrations of salt, temperature and other chemical elements, depend on the relative contribution of water from other basins. Changes in the total volume or proportion of this water mixture can have significant impacts on the process of formation of deep waters in the north of the Atlantic, affecting the intensity of the thermohaline current (Buoyancy). However, the circulation of mesoscale vortices in the Mozambique Channel and south of Madagascar propagating towards the Agulhas Current and has a characteristic dynamics are important for regional and global oceanic circulation, however, the retroflection region of the The Agulhas Current causes part of the waters of this current to enter the Atlantic Ocean, called the Agulhas leak. Projections in climate models for the 21st century predict an increase in this leak and consequently the MOC. In this way, from different data sources (ARMOR3D satellite observation, and the GLORYS and SODA models) we sought to estimate the transport of salt in the Mozambique channel for the needle current system, however, before transport estimates, we analyzed -the distribution of surface salinity in the MZC from the GLORYS model, the results demonstrated a seasonality in the SSM distribution influenced by high rates of evaporation, precipitation and river discharges in coastal regions and in the circulation, after the application of EOF's, also demonstrate high frequency in the variability of surface currents in the northern and central MZC region associated with mesoscale current and vortex. The results of salt transport estimates from data from ARMOR3D, SODA and GLORY (3.10 4 tons. s -1 , 3.8.10 4 tons. s -1 4. 10 4 tons. s -1 of averages) do not show similarities in their behavior over the years. With tendencies to increase the volume of less saline water, affecting the formation of deep waters, and consequently an imbalance in the regional and global climate.