A testbed for geomagnetic data assimilation

dc.contributor.authorGwirtz, K.
dc.contributor.authorMorzfeld, M.
dc.contributor.authorKuang, W.
dc.contributor.authorTangborn, A.
dc.date.accessioned2021-08-24T18:46:27Z
dc.date.available2021-08-24T18:46:27Z
dc.date.issued2021-08-14
dc.description.abstractGeomagnetic data assimilation merges past and present-day observations of the Earth’s magnetic field with numerical geodynamo models and the results are used to initialize forecasts. We present a new “proxy model” that can be used to test, or rapidly prototype, numerical techniques for geomagnetic data assimilation. The basic idea for constructing a proxy is to capture the conceptual difficulties one encounters when assimilating observations into high-resolution, 3D geodynamo simulations, but at a much lower computational cost. The framework of using proxy models as “gate-keepers” for numerical methods that could/should be considered for more extensive testing on operational models has proven useful in numerical weather prediction, where advances in data assimilation and, hence, improved forecast skill, are at least in part enabled by the common use of a wide range of proxy models. We also present a large set of systematic data assimilation experiments with the proxy to reveal the importance of localization and inflation in geomagnetic data assimilation.en_US
dc.description.sponsorshipKG acknowledges that this work was supported by NASA Headquarters under the NASA Earth and Space Science Fellowship Program - Grant “80NSSC18K1351”. MM and KG are supported by the US Office of Naval Research (ONR) grant N00014-21-1-2309. AT and WK are supported by NASA Earth Surface and Interior Program.en_US
dc.description.urihttps://academic.oup.com/gji/advance-article-abstract/doi/10.1093/gji/ggab327/6352338en_US
dc.format.extent46 pagesen_US
dc.genrejournal articlesen_US
dc.genrepostprintsen_US
dc.identifierdoi:10.13016/m26eud-ot4u
dc.identifier.citationGwirtz, K. et al.; A testbed for geomagnetic data assimilation; Geophysical Journal International, 14 August, 2021; https://doi.org/10.1093/gji/ggab327en_US
dc.identifier.urihttps://doi.org/10.1093/gji/ggab327
dc.identifier.urihttp://hdl.handle.net/11603/22667
dc.language.isoen_USen_US
dc.publisherOxford University Pressen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsThis is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record Gwirtz, K. et al.; A testbed for geomagnetic data assimilation; Geophysical Journal International, 14 August, 2021; https://doi.org/10.1093/gji/ggab327 is available online at: https://academic.oup.com/gji/advance-article-abstract/doi/10.1093/gji/ggab327/6352338.
dc.titleA testbed for geomagnetic data assimilationen_US
dc.typeTexten_US

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