Kominz, Michelle A. and Berger, Wolfgang H. (1996): Mixing reality with an orbital climate template; red noise, slumping, and sedimentation rates

Leg/Site/Hole:
ODP 130
ODP 130 806
Identifier:
1997-048207
georefid

Creator:
Kominz, Michelle A.
Rutgers University, Department of Geological Sciences, Piscataway, NJ, United States
author

Berger, Wolfgang H.
Scripps Institution of Oceanography, Geological Research Division, United States
author

Identification:
Mixing reality with an orbital climate template; red noise, slumping, and sedimentation rates
1996
In: Anonymous, Geological Society of America, 28th annual meeting
Geological Society of America (GSA), Boulder, CO, United States
28
7
236-237
Orbital, stochastic, and geologic influences were considered for ODP site 806, Ontong Java Plateau. The orbital influence was obtained by transforming July insolation at 65 degrees north to sea-level using a physically consistent ice growth concept. The transform assumes that ice growth is constant but that melting is dependent on insolation, the size of the ice sheet and the average size of the ice sheet over the previous 57 k.y. The resulting sea-level template is similar in time and frequency domains to the observed oxygen isotope signal. Red noise was superimposed on the insolation curve before application of the transform. Red noise has little effect on precession and obliquity, however the 100 k.y. eccentricity signal is increasingly blurred as red noise is increased beyond 15% of the signal; and the amplitude of the 100 k.y. peak increases. At the Ontong Java Plateau sedimentation rates are higher during glacial periods. A linear relation between sea-level and sedimentation rate was imposed on the sea-level template, generated with a pure climatic signal. The time series, stretched during glacials, destroys the precession and obliquity signals. The short-eccentricity signal shifts towards shorter wavelengths. Occasional, random slumping events occurred at site 806 removing sediment from the plateau. This was simulated with removal of randomly distributed patches of sediment from the climate template. The size of the package removed was given a red-noise distribution. Increased erosion results in decreased spectral resolution at all frequencies, particularly when the events are concentrated over a smaller number of locations.
English
Coverage:Geographic coordinates:
North:0.1907
West:159.2140East: 159.2142
South:0.1906

Quaternary geology; Cenozoic; depositional environment; frequency; glacial environment; glacial geology; ice sheets; Leg 130; mass movements; Milankovitch theory; Ocean Drilling Program; ODP Site 806; Ontong Java Plateau; Pacific Ocean; paleoclimatology; Pleistocene; Quaternary; red noise; sedimentation; sedimentation rates; slumping; statistical analysis; stochastic processes; time series analysis; West Pacific;

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