| Autor: |
Glushkov, A. V., Khokhlov, V. N., Loboda, N. S., Rusov, V. D., Vaschenko, V. N. |
| Přispěvatelé: |
EGU, Publication |
| Jazyk: |
angličtina |
| Rok vydání: |
2005 |
| Předmět: |
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| Popis: |
We examine two paleoclimate proxy records ? the temperature differences from the Antarctic Vostok ice core and the composite ?18O record from three sites (V19-30, ODP 677, and ODP 846) ? in order to search for indications of orbital forcings. We demonstrate that the non-decimated wavelet transform is an appropriate tool for investigating temporarily changing spectral properties of records. Our results indicate that abrupt climate warmings with cyclicity of ~100 kiloyears during the last 400 kiloyears were caused by the combined unidirectional influences of three orbital parameters and the eccentricity can be considered as a modulator defining transitions from the Ice Ages to the periods of comparative warmings. Non-decimated wavelet transform avails discovering the possible part played in climate change by the eccentricity-forced variations. Up to approximately 1.7 million years BP, the influence of this variations of eccentricity appears in increasing for almost all local maxima of ?18O. Since the ~1.7 million years BP, minor and significant maxima alternated and this not affected as much the variations of ?18O. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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