13C Suess Effect in the Gulf of Mexico Deep Waters

Gerardo Quintanilla and Juan Carlos Herguera, Center for Scientific Research and Higher Education at Ensenada, Ensenada, BJ, Mexico
The increase of atmospheric CO2 concentrations product of anthropogenic activities has been traced by a depletion in its 13C to 12C ratio in what is called the 13C Suess Effect. As the ocean dissolves the atmospheric CO2, the Suess effect signal gets printed in the dissolved inorganic carbon isotopic composition (δ13C CID) and can be used as a tracer for the anthropogenic carbon sink in the ocean.

We show the spatial and temporal variation of δ13C CID data from 2010 to 2018 in the Gulf of Mexico deep waters and estimate the Suess Effect in the water masses present in this basin. The δ13C CID values show a Suess Effect as a decreasing tendency of -0.008‰ per year, with the shallower water masses showing the higher anual depletions.