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| Titel |
Low-latitude climate variability in the Heinrich frequency band of the Late Cretaceous greenhouse world |
| VerfasserIn |
N. J. de Winter, C. Zeeden, F. J. Hilgen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 3 ; Nr. 10, no. 3 (2014-05-22), S.1001-1015 |
| Datensatznummer |
250116975
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| Publikation (Nr.) |
 copernicus.org/cp-10-1001-2014.pdf |
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| Zusammenfassung |
| Deep marine successions of early Campanian age from DSDP (Deep Sea Drilling Project) site 516F drilled
at low paleolatitudes in the South Atlantic reveal distinct sub-Milankovitch
variability in addition to precession, obliquity and eccentricity-related
variations. Elemental abundance ratios point to a similar climatic origin
for these variations and exclude a quadripartite structure as an explanation
for the inferred semi-precession cyclicity in the magnetic susceptibility
(MS) signal as observed in the Mediterranean Neogene for precession-related
cycles. However, semi-precession cycles as suggested by previous work are
likely an artifact reflecting the first harmonic of the precession signal.
The sub-Milankovitch variability, especially in MS, is best approximated by
a ~7 kyr cycle as shown by spectral analysis and bandpass
filtering. The presence of sub-Milankovitch cycles with a period similar to
that of Heinrich events of the last glacial cycle is consistent with linking
the latter to low-latitude climate change caused by a non-linear response to
precession-induced variations in insolation between the tropics. |
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