HR: 16:20h
AN: GP44A-01 INVITED     [Abstracts]
TI: Calibration and Validation of Relative Geomagnetic Paleontensity Records
AU: * Constable, C
EM: CConstable@ucsd.edu
AF: Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093-0225, United States
AB: Over the past few decades a burgeoning number of relative paleointensity records derived from sediments has contributed greatly to knowledge of geomagnetic paleosecular variation. It is now broadly accepted that there have been repeated large changes in field strength during the Brunhes polarity interval and there are a significant number of geomagnetic excursions corresponding to lows in the geomagnetic dipole moment. However, the calibration of relative paleointensity data to provide absolute field strengths remains a thorny problem, and it can also be difficult to evaluate the reliability of paleointensity data. For the Holocene relative paleointensity data have been calibrated using the CALS7K.2 time varying paleomagnetic field model. We compare strategies for calibrating relative data, including local or global averaging of VADM records and the use of time varying paleomagnetic field models. Results are used in an assessment of the internal consistency of relative intensity data compared with absolute intensity observations.
DE: 1521 Paleointensity
DE: 1522 Paleomagnetic secular variation
DE: 1532 Reference fields: regional, global
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Joint Assembly