This data release includes sensor data collected from CTD rosette casts during a 2013 (October - November) research expedition onboard the RRS James Cook, JC094, in the Equatorial Atlantic Ocean. The JC094 TROPICS cruise was a fieldwork component of a European Research Council funded project, CACH ('Reconstructing abrupt Changes in Chemistry and Circulation of the Equatorial Atlantic Ocean: Implications for global Climate and deep-water Habitats') led by Prof. Laura Robinson from the University of Bristol to study paleoclimate archives in the Atlantic. Six CTD casts were carried out in four sites of interest: Carter Seamount, Knipovich Seamount, Vema Fracture Zone, and Vayda Seamount.