Trossman, D.S., and Tyler, R. (2024)
Presented at:
Ocean Sciences Meeting 2024Oceanic tidal constituents (namely, M2) and ocean conductivity content (OCC) extracted from electromagnetic (EM) field data (including satellite, land, seafloor, ocean, and airborne magnetometers) have been shown to have strong potential for monitoring global ocean heat content (OHC), which reflects the earth's energy imbalance. Tidal magnetic signals contain information that can be used to invert for OCC, but obtaining the ocean circulation's contribution to the magnetic field includes information about the other unknown parameter in the inversion: the ocean circulation. Here, we calculate the ocean circulation's contribution to the magnetic field in an ocean state estimate (Estimating the Circulation & Climate of the Ocean or ECCO), characterize its variability with the leading empirical orthogonal function modes, and compare with analytical solutions of idealized cases and solutions from other EM models. Then we begin preparations for designing an observing system of a hypothetical fleet of EM Argo floats that piggyback on Deep Argo floats by performing adjoint sensitivity experiments using EM-APEX float data. We conclude by demonstrating that there is relevant information gained using information from the ocean circulation's contribution to the magnetic field for future physical oceanographic applications.
