A testbed for geomagnetic data assimilation
dc.contributor.author | Gwirtz, K. | |
dc.contributor.author | Morzfeld, M. | |
dc.contributor.author | Kuang, W. | |
dc.contributor.author | Tangborn, A. | |
dc.date.accessioned | 2021-08-24T18:46:27Z | |
dc.date.available | 2021-08-24T18:46:27Z | |
dc.date.issued | 2021-08-14 | |
dc.description.abstract | Geomagnetic 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.sponsorship | KG 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.uri | https://academic.oup.com/gji/advance-article-abstract/doi/10.1093/gji/ggab327/6352338 | en_US |
dc.format.extent | 46 pages | en_US |
dc.genre | journal articles | en_US |
dc.genre | postprints | en_US |
dc.identifier | doi:10.13016/m26eud-ot4u | |
dc.identifier.citation | Gwirtz, K. et al.; A testbed for geomagnetic data assimilation; Geophysical Journal International, 14 August, 2021; https://doi.org/10.1093/gji/ggab327 | en_US |
dc.identifier.uri | https://doi.org/10.1093/gji/ggab327 | |
dc.identifier.uri | http://hdl.handle.net/11603/22667 | |
dc.language.iso | en_US | en_US |
dc.publisher | Oxford University Press | en_US |
dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
dc.relation.ispartof | UMBC Joint Center for Earth Systems Technology | |
dc.relation.ispartof | UMBC Faculty Collection | |
dc.rights | This 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.rights | This 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.title | A testbed for geomagnetic data assimilation | en_US |
dc.type | Text | en_US |