Orbital forcings of the Earth?s climate in wavelet domain

• Main Authors: Glushkov, A. V., Khokhlov, V. N., Loboda, N. S., Rusov, V. D., Vaschenko, V. N.
• Other Authors: Institute for Applied Mathematics, Innovative Geosciences Research Centre, Odessa National Polytechnic University, Kiev National University
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2005
• Subjects: [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Antarctic; The Antarctic; Antarc*; ice core
• Online Access: https://hal.science/hal-00298116; https://hal.science/hal-00298116/document; https://hal.science/hal-00298116/file/cpd-1-193-2005.pdf

International audience We examine two paleoclimate proxy records ? the temperature differences from the Antarctic Vostok ice core and the composite ? 18 O 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 ? 18 O. Since the ~1.7 million years BP, minor and significant maxima alternated and this not affected as much the variations of ? 18 O.