959 resultados para Maxima e minima


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Orbital tuning of benthic d18O is a common approach for assigning ages to ocean sediment records. Similar environmental forcing of the northern South China Sea and the southeast Asian cave regions allows for transfer of the speleothem d18O radiometric chronology to the planktonic and benthic d18O records from Ocean Drilling Program Site 1146, yielding a new chronology with 41 radiometrically calibrated datums, spanning the past 350 kyr. This approach also provides for an independent assessment of the accuracy of the orbitally tuned benthic d18O chronology for the last 350 kyr. The largest differences relative to the latest chronology occur in marine isotope stages (MIS) 5.4, 5.5, 6, 7, and 9.3. Prominent suborbital-scale structure believed to be global in nature is identified within MIS 5.4 and MIS 7.2. On the basis of the radiometrically calibrated chronology, the time constant of the ice sheet is found to be 5.4 kyr at the precession band (light d18O lags precession minima by -55.4°) and 10.4 kyr at the obliquity band (light d18O lags obliquity maxima by 57.4°). These values are significantly shorter than the single 17 kyr time constant originally estimated by Imbrie et al. (1984), based primarily on the timing of terminations I and II and the 15 kyr time constant used by Lisiecki and Raymo (2005, doi:10.1029/2004PA001071).

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Planktonic foraminiferal test fragmentation in three cores along a depth transect from the western equatorial Pacific (ERDC-93P, 1619 m; RC17-177, 2600 m; V28-238, 3120 m [Thompson, 1976]) were examined for the last 500 kyr at sample intervals from 2.5 to 5 kyr to study the fluctuations of dissolution in the western equatorial Pacific. The age models were constructed by correlating the delta18O records with the SPECMAP stack [Imbrie et al., 1984]. Results showed that intermediate and deep waters experienced the same patterns of dissolution through climatic cycles. Fragmentation varied with a greater amplitude, and the carbonate ion concentration changed less, in the deep than in the intermediate water. Dissolution has significant variance distributions and coherencies with delta18O over the 100, 41, and 23 kyr periods of orbital variations; dissolution maxima lag ice volume minima by 6 to 20 kyr. The dissolution variability was consistent with recent geochemical models which seek to explain the reduction of atmospheric CO2 concentration at the last glacial maximum [Broecker, 1982; Boyle, 1988].

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Contiene: Collectio nova piscium amboinemsium partim ibi ad vivum delineatorum partim ex museo Henrici Ruysch, 40 p., XX h. de grab. ; Historia naturalis piscium / cura H. Ruysch ; praefatio Joh. Jonstoni, [6], 160 p., XLVIII h. de grab. ; Theatri universalis animalium : pars secunda sive Historiae naturalis de avibus ..., [12], 160 [i.e. 168] p., 62 h. de grab., la última con port. propia

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Contiene: Historiae naturalis de quadrupedibus, 163, [1] p., LXXX h. de grab. ; Theatro universalis animalium pars quarta sive Historiae naturalis de exanguibus ..., [4], 3-58, [2] p., XX h. de grab. ; Theatri universalis animalium pars quinta sive Historiae naturalis de insectis ..., [6], 147, [1] p., XXVIII h. de grab. ; Theatri universalis animalium pars sexta sive Historiae naturalis de serpentibus, [4], 3-37 [i.e. 39], [1] p., XII h. de grab., las tres últimas con port. propia

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Mode of access: Internet.

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Mode of access: Internet.

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Mode of access: Internet.