A method for measuring the removal of carbon from a designated zone of the oceanto the deep ocean, responsive to the addition of nutrients to the designated zone,is disclosed. The method comprises the steps of: (a) determining the directionand speed of a current flow across a plane that extends through the designatedzone； (b) determining an average temperature along the plane； (c) determiningan average chlorophyll concentration along the plane； (d) estimating from thechlorophyll concentration and temperature, the concentration of inorganiccarbon converted to organic carbon, as a result of the addition of nutrients,over the area of the plane； and (e) determining a product of the current flow andthe concentration of converted organic carbon over the plane to provide a measureof the flux of inorganic carbon converted and removed from the designated zoneand, from the integral of this with respect to area, determining the total fluxacross the plane to yield a value of carbon removed from the designated zone tothe deep ocean.
