Extended orbitally forced palaeoclimatic records from the equatorial Atlantic Ceara Rise
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...Thus, the close correspondance in number and in timing and the aforhighlighted ions (δ18O data are from Pälike et al., 2006a)....
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...More interestingly, the ~1.2-myr obliquity cycle was demonstrated as a beat in the major glacial episodes (Zachos et al., 2001b; Wade and Pälike, 2004; Pälike et al., 2006a,b)....
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...…data are from Miller et al. (1991, 1998), otherwise sources are shown in superscript rding to Pälike et al. (2006a), Oi2x corresponds to the unnamed event in Miller et al. (1997), Wes: Westerhold et al. (2005), B: Billups et al. (2002), P: Pekar and DeConto TS model of Pälike et al. (2006a)....
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...…letters, from left to right, as follows. pe data are from Miller et al. (1991, 1998), otherwise sources are shown in superscript rding to Pälike et al. (2006a), Oi2x corresponds to the unnamed event in Miller et al. (1997), Wes: Westerhold et al. (2005), B: Billups et al. (2002), P:…...
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...…records, and apparently have a significant influence on global climate (e.g., Beaufort, 1994; Olsen and Kent, 1999; Zachos et al., 2001a,b; Pälike et al., 2004, 2006a,b; Wade and Pälike, 2004; Mitchell et al., 2008) and sea-level change (e.g. Lourens and Hilgen, 1997; Strasser et al.,…...
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References
8,903 citations
"Extended orbitally forced palaeocli..." refers background or methods or result in this paper
...We previously suggested that the Mi–1 glaciation event at 23Ma was related to a rare confluence of reduced obliquity amplitude variations (a obliquity ‘‘node’’) in combination with low eccentricity (Zachos et al., 2001b)....
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...4 also shows a comparison of our extended data set with the global multi-site compilation of Zachos et al. (2001a)....
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...Interestingly, of the palaeoceanographic proxy time series, the coarse fraction record contains significant spectral peaks at the three climatic precession frequencies, which were also established in the spliced record of Zachos et al. (2001b)....
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...Previously published benthic foraminifer data from ODP Site 926B (Paul et al., 2000; Zachos et al., 2001b) were extended and are plotted with (d) the 463mm coarse fraction data....
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...We note that ETP resembles Northern 0.0 0.2 0.4 0.6 Coarse fraction sin -1 (%/100) 0.5 012 δ18O (‰) -1012 δ13C (‰) -2 f sed) 012 δ18O(‰) (Zachos et al. 2001b) (a)(b)(c)(d) M i-1 l., 2004)....
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3,694 citations
3,582 citations
"Extended orbitally forced palaeocli..." refers background or methods in this paper
...…the code with a letter abbreviation for the geological epoch (Mi for Miocene, Ol for Oligocene) and an indication within which magnetic reversal interval this cycle falls for existing astronomically calibrated sections (Lourens et al., 2005), following the convention of Cande and Kent (1995)....
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...…year long amplitude modulation cycle of obliquity indicated that the age of the Oligocene/Miocene boundary be moved from its previous age of 23.8Ma (Cande and Kent, 1995) to 22.9Ma (Shackleton et al., 2000), and that the amplitude variation of climatic precession would place a further constraint…...
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...Some of the additional magnetic reversal ages given in Lourens et al. (2005) were derived from Australia–Antarctic spreading distances, which are said to improve the original approach of fitting a smooth spline curve to a smaller number of tiepoints as was done by Cande and Kent (1995)....
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..., 2003), and the ages obtained for ODP Leg 154 can be used to refine the geomagnetic polarity time scale (Cande and Kent, 1995)....
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...The record from ODP Leg 177 contained a well-defined data set of magnetic polarity measurements (Channell et al., 2003), and the ages obtained for ODP Leg 154 can be used to refine the geomagnetic polarity time scale (Cande and Kent, 1995)....
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2,992 citations
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...(e) Shows ag obliquity and 1:2Ma obliquity amplitude modulation from Laskar et al. (2004 (‘‘ETP’’), using Laskar et al. (2004), with relative amplitudes reflecting those of 400 ka bandpass filters ( 0:5Ma 1 gaussian bandwidth) applied on ETP (blac position, count and identification of the absolute…...
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...The spectral characteristics of the data and the astronomical solution of Laskar et al. (2004) are summarised in Fig....
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...We note here that the new astronomical solution of Laskar et al. (2004) uses current day values for tidal dissipation and dynamical ellipticity (Pälike and Shackleton, 2000), the established phase relationships for obliquity and climatic precession would be altered when different histories for the…...
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...The new astronomical solution La2004 (Laskar et al., 2004) does still exhibit a node in the obliquity amplitude variation, but this is not as pronounced during the Mi–1 event as previous astronomical solutions....
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...Very recently, an updated and much improved calculation of Earth’s orbital variations was published (Laskar et al., 2004)....
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2,890 citations