HR: 1330h
AN: GP13B-02    [Abstracts]
TI: Spatial Resolutions of Numerical Dynamo Solutions: Implications for Model Error in Data Assimilation
AU: * Liu, D
EM: dliu@bowie.gsfc.nasa.gov
AF: JCET, University of Maryland - Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 United States
AU: Kuang, W
EM: kuang@bowie.gsfc.nasa.gov
AF: Space Geodesy Branch, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Jiang, W
EM: jiang@bowie.gsfc.nasa.gov
AF: JCET, University of Maryland - Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 United States
AU: Tangborn, A
EM: tangborn@gmao.gsfc.nasa.gov
AF: JCET, University of Maryland - Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 United States
AU: Tangborn, A
EM: tangborn@gmao.gsfc.nasa.gov
AF: Space Geodesy Branch, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Bloxham, J
EM: jeremy_bloxham@harvard.edu
AF: Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, MA 02138 United States
AB: We have implemented a 6th-order compact implicit finite difference algorithm in the radial direction in the MoSST core dynamics model (Kuang and Bloxham, 1999; Kuang and Chao, 2003) in order to improve the convergence of the numerical solution. The algorithm is tested on a prototype system similar to that of the geodynamo for various spherical harmonic degrees and parameters. With the improved model we simulate the geodynamo processes with different spatial resolutions, aiming at understanding the time-variation of the model error arising from different spatial resolutions. In particular, treating the high-resolution model solutions as the "true states", and the low-resolution solutions as the "numerical outputs", we seek to understand the effect of inserting knowledge of the "true state" on the model solutions. This analysis can then be used to get an estimate of error growth, which is needed for geomagnetic data assimilation.
DE: 1507 Core processes (8115)
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2005 Joint Assembly