A statistically significant long term characteristic time-scale of test size variation of Calcareous Trochospiral Benthic Foraminifera (CTBF) during the past 120 m.y.

Details A statistically significant long term characteristic time-scale of test size variation of Calcareous Trochospiral Benthic Foraminifera (CTBF) during the past 120 m.y. A statistically significant long term characteristic time-scale of test size variation of Calcareous Trochospiral Benthic Foraminifera (CTBF) during the past 120 m.y.

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30e..21t&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 5, pp. 21-1, CiteID 1217, DOI 10.1029/2001GL013972

Mathematics

Logic

Oceanography: Biological And Chemical: Benthic Processes/Benthos, Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Global Change: Biogeochemical Processes (4805), Mathematical Geophysics: General Or Miscellaneous

Scientific paper

Geo-marine records are faithful recorders of the earth's evolutionary history and hence are most suitable for identifying long-term cyclic patterns. Although a remarkable synchronism among Calcareous Trochospiral Benthic Foraminifera (CTBF) test size variation, ocean productivity, dissolved oxygen and global climate exists, global ``geospectroscopy'' is essential for understanding the wider ramification of significant physical linkages of the various terrestrial and extra-terrestrial processes. Earlier claims of a quasi-periodicity of 26-36 m.y. in various geo-bio-ocean-atmospheric records sparked a major controversy. Here, we examine spectral characteristics of the latest available time series representing fluctuations in test size of CTBF for the past 120 m.y. using the Multi-Taper Method (MTM) and Maximum Entropy Method (MEM) of spectral analyses. The analyses of test size variations of CTBF time series reveal, hitherto unidentified, a statistically significant and stable harmonic component of 35 +/- 5 m.y. against a robust ``red background noise''. Further, wavelet spectral analysis of this record exhibits a strong stationary power in the above frequency band suggesting temporal persistence of spectral peak through the entire evolutionary period. This finding renders credible support to the concept of cyclic geo-marine processes and will provide stimulus for further quantitative research into the coupling of marine geo-bio-chemical cycles.

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