Orbital changes of climate in the northwestern part of the Pacific Ocean according to the data of the study of bottom sediments by XRFA
The chemical composition of the deep-sea sediments of column LV 76-18-1 (north-west of the Pacific) was measured at the collective station, VEPP 3 (Institute of Nuclear Physics, SB RAS). Coordinates of the column: 49 ° 03.2 'N, 168 ° 32.3'E, depth of the sea 2683 m, column length 810 cm.
The aim of the study is to study climate change in the northwestern Pacific Ocean, both on the scale of the orbital changes, and in millennia changes in the global climate in the past.
This region of the Pacific is extremely poorly studied, and therefore our results will reveal new patterns in climate change in this region and understand the mechanisms of their connection with global climate changes based on well-studied and dated data of the North Atlantic (Sarnthein et al., 2007), ice cores of Greenland (NGRIP members, 2004) and Antarctica (Jouzel et al., 2007) and monsoon southeast Asia (Wang et al., 2008). The preliminary age scale of this column with Isotope Oxygen Precipitation (BKS) boundary boundaries according to Bassinot et al. (1994) was established based on a study of sediment lithology, tephrochronology, color characteristics of sediments (clarity of sediment and parameters b), element composition and magnetic properties of sediments. Changes in the content of individual elements allow us to reconstruct the changes in biological productivity, the intensity of ventilation of deep waters and other parameters of the medium (the content of Ca, Br and As, U, respectively).
In the spectra of the elements of K Rb Ca Br Nb, etc., there are lines with a periodicity of 19 and 24 thousand years and 40 thousand years, and in the spectra of Br and Nb there are lines of more high-frequency. This is evidence of the impact on the regional climate and environment of both orbital changes in the parameters of the Earth's rotation, and the millennial climate processes.
This work was supported in the framework of the joint work of the Far Eastern Branch of the Russian Academy of Sciences with the National Science Council, Taiwan for 2017 (project number 17-NSN-003 "High-resolution records of responses of the paleoceanology of the Bering Sea and the northwestern Pacific to global climatic changes in the late Pleistocene-Holocene").
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