HR: 17:45h
AN: GP22B-08    [PDF]
TI: The Global Geomagnetic Field on the Millennial Scale: Improving on CALS3K.1
AU: * Korte, M
EM: monika@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Telegrafenberg, Potsdam, 14473 Germany
AU: Genevey, A
EM: agenevey@ucsd.edu
AF: Scripps Institution of Oceanography, IGPP, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0225 United States
AU: Constable, C
EM: cconstable@ucsd.edu
AF: Scripps Institution of Oceanography, IGPP, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0225 United States
AB: The amount of high-resolution archeo- and paleo-secular variation data from areas all over the Earth is continually increasing. The spatial and temporal density is high enough now to allow for continuous global modeling of this data on millennial time scale. With CALS3K.1 we presented a first attempt at a time-varying model like those using historical data. CALS3K.1 was based on directional data for the last 3k years. A new global compilation of intensity data has now been included and supersedes assumptions imposed on CALS3K.1 about the temporal evolution of the axial dipole moment. Re-assessment of older and addition of new directional data increases the spatial resolution of the model. Extension of the model to 7k years seems feasible. Dating uncertainties, however, are a major problem in evaluating the reliablity of the global field distribution and secular variation given by the models. We present new global models and discuss their reliablity and implications for core dynamics.
DE: 1503 Archeomagnetism
DE: 1507 Core processes (8115)
DE: 1521 Paleointensity
DE: 1522 Paleomagnetic secular variation
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting