Abstract
Suborbital-scale climate variations, possibly caused by solar activity, are observed in the Holocene and last-glacial climates. Recently published bicentennial-resolution paleoceanic environmental records reveal millennial-scale high-amplitude oscillations postdating the last geomagnetic reversal in the Marine Isotope Stage (MIS) 19 interglacial. These oscillations, together with decoupling of post-reversal warming from maximum sea-level highstand in mid-latitudes, are key features for understanding the climate system of MIS 19 and the following Middle Pleistocene. It is unclear whether the oscillations are synchronous, or have the same driver as Holocene cycles. Here we present a high resolution record of western North Pacific submarine anoxia and sea surface bioproductivity from the Chiba Section, central Japan. The record reveals many oxic events in MIS 19, coincident with cold intervals, or with combined cold and sea-level fall events. This allows detailed correlations with paleoceanic records from the mid-latitude North Atlantic and Osaka Bay, southwest Japan. We find that the millennial-scale oscillations are synchronous between East and West hemispheres. In addition, during the two warmest intervals, bioproductivity follows the same pattern of change modulated by bicentennial cycles that are possibly related to solar activity.
Highlights
Core, drilled in the Chiba Section[18], provides a continuous and high-resolution record of paleoenvironmental changes during Marine Isotope Stage (MIS) 19
Coherent variation between anhysteretic remanent magnetization (ARM) and χ show the response to changes in concentration of ferrimagnetic grains (Fig. 1b)
The χ, ARM and ARM/χ values synchronously exhibit several sharp (30–40 cm thick) oxic events evidenced by grain coarsening
Summary
Core, drilled in the Chiba Section[18], provides a continuous and high-resolution record of paleoenvironmental changes during MIS 19. High-resolution records of organic matter content and sediment color variation since the last glacial in a core recovered from the Japan Sea show millennial scale variation synchronous with Greenland ice core oxygen isotope data[19], likely related to Dansgaard–Oeschger (D-O) cycles[3]. These data, together with terrestrial sediment records[20,21,22,23], suggest the possibility of millennial-scale East-West hemispheric climatic teleconnections in the late Quaternary. The core is a good candidate for the investigation of millennial-to-centennial scale rapid climate oscillations during MIS 19 and their global extent
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