Fonte Ou Sumidouro? Uma Revisão Sobre Os Fluxos De Co2 Na Plataforma Continental Brasileira

Abstract

SOURCE OR SINK? A REVIEW OF THE CO2 FLUXES AT THE BRAZILIAN CONTINENTAL SHELF. Studies of global carbon balance estimates are still incipient in the oceans of the Southern Hemisphere, mainly in coastal areas and continental shelf. Even in Brazil, despite its continental proportion coastline, there is still a great inconsistency in studies on the marine carbonate system and CO2 fluxes at the air-sea interface. This article presents a review of studies on CO2 fluxes on the coast of Brazil, published between the years 2000 and 2022, aiming to map the distribution of CO2 fluxes on the Brazilian continental shelf, to understand its role as a source or sink of CO2. In general, large-scale studies show that the Brazilian shelf exhibits a latitudinal variation of air-sea CO2 fluxes, behaving mainly as a source in the north, where there is no influence of the Amazon River plume, and as a sink in the south portion. We also identified there is a strong influence on the occurrence of mesoscale and synoptic oceanographic and meteorological events, and the presence of different ecosystems, which can change the behavior of CO2 fluxes locally. However, there are still many data gaps along the continental shelf, as well as in different seasons for the entire coast.

Sea-air CO 2 fluxes along the Brazilian continental margin

“…In the following decades (2001-2010; 2011-2018), negative temporal trends were recorded, thus characterizing the area as an atmospheric CO 2 sink. Based on an extensive literature review on CO 2 fluxes along the Brazilian continental shelf, Oliveira et al 2022 found evidence of a latitudinal variation in source/ sink behavior, observing the North-Northeast as mainly CO 2 source areas, the Southeast region acting as a weak CO 2 source, and in the southern region, there is a tendency towards a permanent CO2 sink. These patterns may vary over time, depending on local oceanographic and biological processes, and different anthropogenic pressures (e.g.…”