Maximum Entropy Spectral Analysis of the geological time series of the oxygen isotope record from deep-sea cores

1992 ◽  
Vol 139 (1) ◽  
pp. 145-162 ◽  
Author(s):  
R. P. Kane ◽  
N. B. Trivedi
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Oxygen Isotope ◽  
Maximum Entropy ◽  
Deep Sea ◽  
Geological Time ◽  
Maximum Entropy Spectral Analysis ◽  
Oxygen Isotope Record ◽  
Isotope Record

Speleothems, Travertines, and Paleoclimates

1983 ◽  
Vol 20 (1) ◽  
pp. 1-29 ◽  
Author(s):  
G. J. Hennig ◽  
R. Grün ◽  
K. Brunnacker
Keyword(s):  
Oxygen Isotope ◽  
Deep Sea ◽  
Clear Relationship ◽  
Sufficient Data ◽  
Geographic Position ◽  
Oxygen Isotope Record ◽  
Isotope Record ◽  
Age Range ◽  
Stimulation Of ◽  
Frequency Curves

AbstractAge data for about 660 speleothems and about 140 spring-deposited travertines were collected, including many unpublished results. These data were plotted as histograms and also as error-weighted frequency curves on a 350,000-yr scale. These plots clearly show periods of increased speleothem/travertine growth as well as times of cessation. The periods of most frequent speleothem growth were between approximately 130,000 and 90,000 yr ago and since about 15,000 yr ago. Such periods before 150,000 yr ago, however, cannot be yet recognized because of a lack of sufficient data and the associated uncertainties of dates in this age range. A comparison with the oxygen-isotope record of deep-sea core V28–:238 shows a clear relationship, indicating that terrestrial calcite formation is controlled by paleoclimatic fluctuations. The evident climatic stimulation of Quaternary calcite formation is readily explained geochemically and is substantiated by the obvious difference in speleothem/travertine growth as a function of geographic position.

Choice of operator length for maximum entropy spectral analysis

Geophysics ◽  
1978 ◽  
Vol 43 (7) ◽  
pp. 1384-1391 ◽  
Author(s):  
James G. Berryman
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Maximum Entropy ◽  
Empirical Evidence ◽  
Discrete Time ◽  
Seismic Data ◽  
A Priori ◽  
Evidence Based ◽  
Maximum Entropy Spectral Analysis ◽  
Discrete Time Series

Empirical evidence based on maximum entropy spectra of real seismic data suggests that M = 2N/ln 2N is a reasonable a priori choice of the operator length M for discrete time series of length N. Various examples support this conclusion.

Maximum Entropy Spectral Analysis of Time-Series Data from Combustion MHD Plasma

1985 ◽  
Vol 24 (Part 1, No. 9) ◽  
pp. 1204-1211 ◽  
Author(s):  
Tadashi Seidou ◽  
Yoshiaki Aoki ◽  
Norio Ohtomo
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Maximum Entropy ◽  
Time Series Data ◽  
Series Data ◽  
Maximum Entropy Spectral Analysis ◽  
Analysis Of Time Series

The Holstein Interglaciation: Time-Stratigraphic Position and Correlation to Stable-Isotope Stratigraphy of Deep-Sea Sediments

1986 ◽  
Vol 26 (3) ◽  
pp. 283-298 ◽  
Author(s):  
Michael Sarnthein ◽  
Helmut E. Stremme ◽  
Augusto Mangini
Keyword(s):  
Oxygen Isotope ◽  
Deep Sea ◽  
Significant Proportion ◽  
Soil Formation ◽  
Oxygen Isotope Record ◽  
Isotope Record ◽  
Stratigraphic Position ◽  
Isotope Stratigraphy ◽  
Global Sea Level ◽  
Central Atlantic

Marine molluscan shells from para-type and other localities of the Holsteinian interglaciation were dated by Th/U and the electron spin resonance (ESR) method to more than 350,000 and 370,000 yr B.P., beyond the limit of Th/U dating. The high age estimate is corroborated by a K/Ar age of 420,000 yr B.P. determined from volcanic ash near the base of the Ariendorf paleosol in the Middle Rhine valley believed to be a pedostratigraphic equivalent of the Holsteinian. Shells from the Herzeele marine unit III, an equivalent of the Wacken (Dömnitz) warm stage in northern France and subsequent to the Holsteinian, revealed ages between 300,000 and 350,000 yr B.P. A correlation of these two warm stages with marine oxygen-isotope stages 11 and 9 on the SPECMAP and CARTUNE time scales is suggested. From the benthic oxygen-isotope record one may infer that no exceptionally high global sea-level rise corresponds to the large transgressions of the Holstein Sea in northern Germany. Therefore, a significant proportion of the transgression was probably the result of an unusually large local glacial-isostatic depression caused by the extreme buildup of ice during the preceding Elster glaciation (stage 12). According to the deep-sea record, it lasted approximately 50% longer than the subsequent cold stage 10. The outstanding soil formation with Braunlehm and the well-developed thermal optimum of the Holsteinian are tentatively related to a phase of minimum sea-ice cover in the Norwegian-Greenland Sea, as deduced from long benthic carbon-isotope records from the central Atlantic.

scholarly journals Periodicities in the time-series of the annual mean temperatures of Central England

MAUSAM ◽  
2021 ◽  
Vol 48 (1) ◽  
pp. 41-44
Author(s):  
R.P. KANE ◽  
N.B. TRIVEDI
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Maximum Entropy ◽  
Sunspot Number ◽  
Temperature Series ◽  
Number Series ◽  
Maximum Entropy Spectral Analysis ◽  
Mean Temperature ◽  
Good Comparison

ABSTRACT .Maximum Entropy spectral Analysis (MESA) of the 8IUlua1 mean temperature series for Central England for 1659-1991 indicated significant periodicilies at T = 7.8, 11.1, 12.5, 15, 18, 23, 32, 37, 68, 81, l09 and 203 years. These compare well with T = 22, 30, 80, 200 years obtained for China. Also, a good comparison is obtained with some periodicities in the sunspot number series.    

Periodicities in Atlantic Coast Striped Bass (Morone saxatilis) Commercial Fisheries Data

1979 ◽  
Vol 36 (1) ◽  
pp. 54-62 ◽  
Author(s):  
Webster Van Winkle ◽  
Bernadette L. Kirk ◽  
Bert W. Rust
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Maximum Entropy ◽  
Striped Bass ◽  
Atlantic Coast ◽  
Morone Saxatilis ◽  
Commercial Fisheries ◽  
Time Interval ◽  
Maximum Entropy Spectral Analysis ◽  
The North

Atlantic Coast striped bass (Morone saxatilis) commercial fisheries data are examined for periodicities in the appearance of dominant year-classes using autocorrelation and spectral-analysis techniques. Results obtained using maximum entropy and classical Fourier spectral-analysis methods are compared. Statistically significant periodicities of approximately 20 yr and of 6–8 yr are common to the time series for most states and regions. Since the periodicities are neither very pronounced nor simple, it is difficult to isolate the causative factors, which are more likely to be density-independent environmental factors enhancing survival of the young than intrinsic characteristics of the life cycle of striped bass. The spectra for Maryland landings and Maryland landings per unit gear are nearly identical, suggesting that at least for Maryland the landings and landings-per-unit-gear data are approximately equally reliable as indices of stock size. The structure of the North Carolina time series is unique, which supports the opinion that this stock does not mix appreciably with Chesapeake and Hudson stocks. Impact assessments and monitoring programs should not be predicted on the expectation of pronounced or simple periodicities of 6 years or any other time interval in the appearance of dominant year-classes in Atlantic Coast striped bass populations. Key words: autocorrelation analysis, commercial fisheries data, Fourier spectral analysis, maximum entropy spectral analysis, periodicities, striped bass

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