Age determinations of bottom sediments from the Sea of Okhotsk by different methods, supplement to: Bubenshchikova, N V; Nürnberg, Dirk; Gorbarenko, Sergey A; Lembke-Jene, Lester (2010): Variations of the oxygen minimum zone of the Okhotsk Sea during the last 50 ka as indicated by benthic foraminiferal and biogeochemical data. Translated from Okeanologiya, 2010, 50(1), 99-113, Oceanology, 50(1), 93-106

On the base of data on benthic foraminifera and sediment biogeochemistry (contents of total organic carbon, calcium carbonate and biogenic opal) in two cores (1265 and 1312 m water depth) from the southeastern Sakhalin slope and one core (839 m water depth) from the southwestern Kamchatka slope vari...

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Bibliographic Details
Main Authors: Bubenshchikova, N V, Nürnberg, Dirk, Gorbarenko, Sergey A, Lembke-Jene, Lester
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2010
Subjects:
Gravity corer
LV28
Akademik M.A. Lavrentiev
Archive of Ocean Data ARCOD
Lester
Okhotsk
Pacific
Kamchatka
okhotsk sea
Sakhalin
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.763911
https://doi.pangaea.de/10.1594/PANGAEA.763911
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Summary:On the base of data on benthic foraminifera and sediment biogeochemistry (contents of total organic carbon, calcium carbonate and biogenic opal) in two cores (1265 and 1312 m water depth) from the southeastern Sakhalin slope and one core (839 m water depth) from the southwestern Kamchatka slope variations of the oxygen minimum zone during the last 50 ka in the Okhotsk Sea are reconstructed. The oxygen minimum zone was less pronounced during cooling in the MIS 2 that is suggested to be caused by maximal expansion of the sea ice cover, decrease of marine productivity and increase of production of oxygenated Okhotsk Sea Intermediate Water (OSIW). Two-step-like strengthening of oxygen minimum zone during warmings in the Terminations 1a and 1b was combined with (1) enhanced oxygen consumption due to decomposition of large amount of organic matter in the water column and bottom sediments due to increased marine productivity and supply of terrigenous material from submerged northern shelves; (2) sea ice cover retreat and reduction of OSIW production; (3) freely inflow of the oxygen-depleted intermediate water mass from the North Pacific.

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