The third TROPECOS field work in mangroves of Marapanim Pará (19 Sep. 2025 – 3 Oct. 2025, involved 7 research scientists and students from BOREA, MPEG, UFF and UFPA. We measured gas fluxes in mangrove soils and waters, dissolved carbon concentrations and tidal exchanges, isotopic composition of dissolved inorganic carbon and methane, and litter fall. A world record of tidal variation of pCO2 in a mangrove tidal creek was obtained during equinox spring tides, with values lower than 900 ppmv at high tide and higher than 9 000 ppmv at low tide.
Tropical estuaries and mangroves in the global carbon cycle
