CALS3k, ARCH3k, SED3k

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This series of 5 main field models spanning the past 3kyrs was created to obtain a better understanding of the possibilities and limitations offered by different data types to reconstruct the global geomagnetic main field of the Holocene. Archeomagnetic data are generally considered to offer smaller uncertainties and particularly better age control than sediment records. Moreover, sediment records can at most provide information on relative intensity variation, but not on absolute paleointensity. On the other hand, archeomagnetic data are sparse prior to 1000 BC and from the southern hemisphere in general. Longer term global field reconstructions necessarily have to rely on sedimentary data, and even 3kyr models based only on archeomagnetic data are biased by the hemispherically assymmetric data distribution. Details are given in the references below. We conclude that models based on all available data, both archeomagnetic and sediments like in CALS3k.3, at present provide the most reliable reconstruction of the past geomagentic field evolution.

The five models are:

  • CALS3k.3 based on all available data and with uncertainty estimates based on a bootstrap method.
  • CALS3k_cst.1 based on all data types but with prior quality selection.
  • ARCH3k.1 based only on archeomagnetic data and with uncertainty estimates based on a bootstrap method.
  • ARCH3k_cst.1 based on archeomagnetic data with prior quality selection.
  • SED3k.1 based only on sediment records where relative intensity has been scaled by the archeomagnetic model and with uncertainty estimates based on a bootstrap method.

References:  

  • Korte, M., F. Donadini and C. Constable (2009): Geomagnetic Field for 0-3ka: 2. A new Series of Time-varying Models. Geochem. Geophys. Geosys., 10, Q06008, doi:10.1029/2008GC002297
  • Donadini, F., M. Korte and C. Constable (2009): Geomagnetic Field for 0-3ka: 1. New Data Sets for Global Modeling. Geochem. Geophys. Geosys., 10, Q06007, doi:10.1029/2008GC002295

Download

DateiTypGrößeDatumInhalt
CALS3k_3.zip ZIP1,5MBMai 2010CALS3k_3 Model coefficients with uncertainty estimates and Fortran code for evaluation.
ARCH3k_1.zip ZIP30kBMai 2010ARCH3k_1 Model coefficients with uncertainty estimates and Fortran code for evaluation.
SED3k_1.zip ZIP6,4MBMai 2010SED3k_1 Model coefficients with uncertainty estimates and Fortran code for evaluation.
CALS3k_cst_1.zipZIP6,5MBMai 2010CALS3k_cst_1 Model coefficients and Fortran code for evaluation.
ARCH3k_cst_1.zip ZIP1,4MBMai 2010ARCH3k_cst_1 Model coefficients and Fortran code for evaluation.
Dipole.zip ZIP700kBMai 2010Dipole Text files with dipole moments (with uncertainties) for all 5 models.

Kontakt

Profilfoto von  Dr. Monika Korte

Dr. Monika Korte
Geomagnetismus

Behlertstraße 3a
Haus K 3, Raum 116
14467 Potsdam
Tel. +49 331 288-1268