Physical oceanographic factors controlling the ocean circulation-induced magnetic field

Trossman, David S.; Tyler, Robert H.; Pillar, Helen R.

doi:10.1098/rsta.2024.0076

i

Physical oceanographic factors controlling the ocean circulation-induced magnetic field

2024
By Trossman, David S. ; Tyler, Robert H. ; Pillar, Helen R.

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Journal Title:

Philosophical Transactions A
Personal Author:

Trossman, David S. ; Tyler, Robert H. ; Pillar, Helen R.
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; STAR (Center for Satellite Applications and Research) ; CISESS (Cooperative Institute for Satellite Earth System Studies)
Description:

Oceanic tidal constituents and depth-integrated electrical conductivity (ocean conductivity content, or OCC) extracted from electromagnetic (EM) field data are known to have a strong potential for monitoring ocean heat content, which reflects the Earth’s energy imbalance. In comparison to ocean tide models, realistic ocean general circulation models have a greater need to be baroclinic; therefore, both OCC and depth-integrated conductivity-weighted velocity (Tσ) data are required to calculate the ocean circulation-induced magnetic field (OCIMF). Owing to a lack of Tσ observations, we calculate the OCIMF using an ocean state estimate. There are significant trends in the OCIMF primarily owing to responses in the velocities to external forcings and the warming influence on OCC between 1993 and 2017, particularly in the Southern Ocean. Despite being depth-integrated quantities, OCC and Tσ (which primarily determine the OCIMF in an idealized EM model) can provide a strong constraint on the baroclinic velocities and ocean mixing parameters when assimilated into an ocean state estimation framework. A hypothetical fleet of full-depth EM-capable floats would therefore help improve the accuracy of the OCIMF computed with an ocean state estimate, which could potentially provide valuable guidance on how to extract the OCIMF from satellite magnetometry observations.
Keywords:

Electric Conductivity Magnetic Fields Ocean Circulation Electric Conductivity Magnetic Fields Ocean Circulation ECCO EM-APEX
Source:

Phil. Trans. R. Soc. A 382: 20240076
DOI:

https://doi.org/10.1098/rsta.2024.0076
Format:

PDF
Document Type:

Journal Article
Funding:

Grant no. NA19NES4320002 ; Grant no. NA24NESX432C0001
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
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