Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p31c1260k&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P31C-1260
Other
[1507] Geomagnetism And Paleomagnetism / Core Processes, [1510] Geomagnetism And Paleomagnetism / Dynamo: Theories And Simulations, [3315] Atmospheric Processes / Data Assimilation, [5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism
Scientific paper
Early geodynamo simulation results showed that free-slip and no-slip boundary conditions on core fluid flow could yield two kinds of dynamo solutions of which the magnetic field morphologies are similar at the surface of the Earth, but very different inside the outer core: one that is dominant outside the tangent cylinder (the cylinder co-axial with the Earth’s rotation axis and tangent to the solid inner core), while the other is dominant inside the tangent cylinder. More recent simulation results with much lower viscosity (i.e. much smaller Ekman number) show similar field morphology differences with the fixed temperature and the fixed heat flux boundary conditions. Which field morphology is “closer” to the true dynamical state in the Earth’s outer core? We attempt to answer this via data assimilation approach: assimilating surface geomagnetic observations over the past 400 years with two numerical dynamo models that are different only in the thermal boundary conditions. We shall examine the error growth of the assimilated solutions with respect to the surface geomagnetic observations to better understand the responses of the models to the observational constraint, thus shedding light on which of the two models could provide better approximation to the dynamical processes in the outer core.
Kuang Weijia
Tangborn Andrew
Wei Zhaohui
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