Extracting ocean-generated tidal magnetic signals from Swarm data through satellite gradiometry

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dc.contributor.authorSabaka, Terence J.
dc.contributor.authorTyler, Robert H.
dc.contributor.authorOlsen, Nils
dc.date.accessioned2022-05-25T16:00:04Z
dc.date.available2022-05-25T16:00:04Z
dc.date.issued2016-03-27
dc.description.abstractOcean-generated magnetic field models of the Principal Lunar, M2, and the Larger Lunar elliptic, N2, semidiurnal tidal constituents were estimated through a “Comprehensive Inversion” of the first 20.5 months of magnetic measurements from European Space Agency's (ESA) Swarm satellite constellation mission. While the constellation provides important north-south along-track gradiometry information, it is the unique low-spacecraft pair that allows for east-west cross-track gradiometry. This latter type is crucial in delivering an M2 estimate of similar quality with that derived from over 10 years of CHAMP satellite data but over a shorter interval, at higher altitude, and during more magnetically disturbed conditions. Recovered N2 contains nonoceanic signal but is highly correlated with theoretical models in regions of maximum oceanic amplitude. Thus, satellite magnetic gradiometry may eventually enable the monitoring of ocean electrodynamic properties at temporal resolutions of 1 to 2 years, which may have important implications for the inference of ocean temperature and salinity.en_US
dc.description.sponsorshipWe would like to thank ESA for access to the Swarm Level 1b data. We would also like to thank the staff of the geomagnetic observatories and INTERMAGNET for supplying high-quality observatory data. We thank two anonymous reviewers for their valuable comments, and we thank Richard Ray for useful discussions and for providing Greenwich phase calculation software. Several figures were generated using the Generic Mapping Tools (GMT) package [Wessel and Smith, 1991]. The NASA Center for Climate Simulation at Goddard Space Flight Center provided computational resources. T.J.S. and R.H.T. are supported by the NASA Earth Surface and Interior program, and N.O. is supported by ESA's STSE program. Swarm Level 1b data are available from ESA at http://earth.esa.int/swarm, and the tidal coefficients of CI1 are available by contacting the authors directly.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/2016GL068180en_US
dc.format.extent9 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2jaeg-546i
dc.identifier.citationSabaka, T. J., R. H. Tyler, and N. Olsen(2016), Extracting ocean-generated tidal magnetic signals from Swarm data through satellite gradiometry, Geophys. Res. Lett.,43, 3237–3245,doi:10.1002/2016GL068180.en_US
dc.identifier.urihttps://doi.org/10.1002/2016GL068180
dc.identifier.urihttp://hdl.handle.net/11603/24722
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleExtracting ocean-generated tidal magnetic signals from Swarm data through satellite gradiometryen_US
dc.typeTexten_US

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