The effects of aliasing and lock-in processes on palaeosecular variation records from sediments

Details The effects of aliasing and lock-in processes on palaeosecular variation records from sediments The effects of aliasing and lock-in processes on palaeosecular variation records from sediments

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.142..563t&link_type=abstract

Geophysical Journal International, Volume 142, Issue 2, pp. 563-570.

Astronomy and Astrophysics

Astronomy

9

Palaeointensity, Palaeomagnetism, Sediments, Spectral Analysis

Scientific paper

Studies of sedimentary records of palaeointensity variation report periods as long as 50kyr. Archaeointensity data show geomagnetic periods of 2kyr with large amplitudes. Sampling of the sedimentary records can be as coarse as 8kyr, so the apparent long periods could be caused by aliasing. The sedimentary lock-in process could smooth the record and remove short periods, thereby preventing aliasing from occurring. We examine possible effects of aliasing by creating a 100-kyr-long synthetic sequence of palaeointensity variation with a similar spectrum to that of archaeomagnetic data from the last 12kyr and resampling at longer intervals. With no lock-in smoothing, aliasing produces spurious energy in the spectra at long periods. When smoothing by the sedimentation process is applied, the amplitudes of the aliased peaks are reduced but still cause significant, spurious, long-period energy in the spectra for some sedimentation rates. We restrict our analysis to palaeointensity data but similar problems may also exist for coarsely sampled directional data. To avoid aliasing we recommend a maximum sampling interval of 2kyr.

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