Paleoenvironment changes in the NW Okhotsk Sea for the last 18kyr determined with micropaleontological, geochemical, and lithological data

Regionalized primary paleoproduction variability in the sea of Okhotsk during late Pleistocene and Holocene

“…All these factors make the OS susceptible to as regional as global climate changes and suitable for high-resolution paleooceanography studies. Recently great efforts were focused on study of the OS productivity due to its important role in understanding of the modern and past environment evolution (Bosin et al, 2010;Gorbarenko and Goldberg, 2005;Gorbarenko et al, 2010bGorbarenko et al, , 2007bLapshina, 1996;Mordasova, 1997;Nürnberg and Tiedemann, 2004;Seki et al, 2004Seki et al, , 2009Shuntov, 2001;Sorokin and Sorokin, 1999;Zakharkov et al, 2007).…”

Radiolarian responses of the central Okhotsk Sea to the global orbital and millennial scale climate oscillations over last 90kyr

“…The study of TRC and SR of the radiolarian assemblage as well as absolute and relative abundance of C. davisiana and concentration of other dominant species in the sediments of the core from the central part of the OS over last 90 kyr with previously established age scale, position of the millennial cycles of climatic changes and records of variations of different proxies of productivity and activity of sea ices was carried out (Gorbarenko, 2010b;2012).…”

“…Earlier the control points of the core PC-7R was based on the position of the MIS boundaries, correlation of geomagnetic paleointensity record curve with dated paleointensity curves and tephrochronology (Gorbarenko et al, 2010a(Gorbarenko et al, , 2010b. In addition to ages of control point (Gorbarenko, 2010a, Table 1), we define boundary of Bølling-Allerød (B/A) warming, Younger Dryas (YD) cooling and base of diatomaceous ooze at depths of 37 cm and 13 cm on the basis of productivity proxies records ( Fig.…”

“…Based on the results of the high-resolution study of dated sediments of the OS over last 350 kyr presented in works by Gorbarenko et al (2007Gorbarenko et al ( , 2010aGorbarenko et al ( , 2010bGorbarenko et al ( , 2012, a response of the OS paleoenvironment to the fast climatic warming and cooling synchronous with climatic cycles recorded in the ice cores of Greenland (NGRIP Member, 2004) and stalagmites from caves of China was revealed. In the subsequent works (Psheneva and Gorbarenko, 2013;Gorbarenko et al, 2014), based on geochemical and micropaleontological data (diatoms and benthic foraminifera) and with high temporal resolution, the changes of surface waters and near-bottom conditions in the OS related to the millennial climatic oscillations were for the first time shown.…”

Regional features of variations in paleoproductivity of the Sea of Okhotsk in the Late Pleistocene and Holocene

“…Sea transgression was accompanied by an increase in the entry of nutrients from land. At the same time, stratification of the surface layer in the warm season intensified [15,17,26,27,39]. These factors led to the rapid development of phytoplankton.…”