Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series

Paired Mg/Ca and δ 18 O measurements on planktonic foraminiferal species ( G. ruber white, G. ruber pink, G. sacculifer , G. conglobatus , G. aequilateralis , O. universa , N. dutertrei , P. obliquiloculata , G. inflata , G. truncatulinoides , G. hirsuta , and G. crassaformis ) from a 6‐year sediment trap time series in the Sargasso Sea were used to define the sensitivity of foraminiferal Mg/Ca to calcification temperature. Habitat depths and calcification temperatures were estimated from comparison of δ 18 O of foraminifera with equilibrium calcite, based on historical temperature and salinity data. When considered together, Mg/Ca (mmol/mol) of all species, except two, show a significant (r = 0.93)…