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  • 1
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    PANGAEA
    In:  Supplement to: Barash, Max S; Bubenshchikova, N V; Kazarina, Galina Kh; Khusid, Tatyana A (2001): Paleoceanography of the central part of the Sea of Okhotsk over the past 200 ky (on the basis of micropaleontological data). Translated from Okeanologiya, 2001, 41(5), 755-767, Oceanology, 41(5), 723-735
    Publication Date: 2023-06-27
    Description: Distribution of diatoms and planktonic and benthic foraminifers, as well as correlation of components of sandy grain size fraction were studied in the Quaternary sediment core LV28-42-5 (720 cm long) col¬lected on the southeastern slope (1045 m depth) of the Institute of Oceanology Rise, Sea of Okhotsk. This study allowed to reconstruct principle features of paleoceanographic evolution. In the course of penultimate and last continental glaciations (isotope stages 6 and 4-2) and during the later period of the last interglacial (substages 5.d-5.a) the following conditions were characteristic of this area: low temperatures of surface water, terrigenous sediment accumulation including coarse grained ice-rafted material, minimum bioproductivity and microfossil content in sediments, low sea level, reduced water exchange with the ocean, low position of old deep Pacific water. During the interglacial optimum (substage 5.e), as well as in the last deglaciation and Holocene (stage 1) water temperature and bioproductivity increased, sea level rose, and active surface water exchange between the Sea of Okhotsk and the Pacific Ocean and the Sea of Japan took place. This resulted in intensive inflow of the old deep Pacific water into the Sea of Okhotsk and elevation of its upper boundary by few hundred meters. During the later intervals of these warm periods a dichothermal structure of the upper water layer formed and diatom oozes accumulated.
    Keywords: Akademik M.A. Lavrentiev; Archive of Ocean Data; ARCOD; GC; Gravity corer; KOMEX I; LV28; LV28-42-5; Sea of Okhotsk
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    PANGAEA
    In:  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, https://doi.org/10.1134/S000143701001011X
    Publication Date: 2023-06-27
    Description: 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.
    Keywords: Akademik M.A. Lavrentiev; Archive of Ocean Data; ARCOD; GC; Gravity corer; KOMEX I; LV28; LV28-2-4; LV28-40-5; LV28-43-5; Sea of Okhotsk
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
    Publication Date: 2023-06-27
    Keywords: Akademik M.A. Lavrentiev; Archive of Ocean Data; ARCOD; Calculated; Cassidulina laevigata; Cassidulina teretis; Counting, foraminifera, benthic; DEPTH, sediment/rock; Foraminifera, benthic, other; GC; Gravity corer; KOMEX I; LV28; LV28-42-5; Martinottiella communis; Sea of Okhotsk; Sum; Uvigerina peregrina; Uvigerina senticosa
    Type: Dataset
    Format: text/tab-separated-values, 469 data points
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  • 4
    Publication Date: 2023-06-27
    Keywords: Akademik M.A. Lavrentiev; Archive of Ocean Data; ARCOD; Date/Time of event; Elevation of event; Event label; GC; Gravity corer; KOMEX I; Latitude of event; Longitude of event; LV28; LV28-2-4; LV28-40-5; LV28-43-5; Oxygen; Sea ice cover duration; Sea of Okhotsk
    Type: Dataset
    Format: text/tab-separated-values, 6 data points
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  • 5
    Publication Date: 2023-06-27
    Keywords: Age, comment; Age, dated; Akademik M.A. Lavrentiev; Analytical method; Archive of Ocean Data; ARCOD; Date/Time of event; DEPTH, sediment/rock; Elevation of event; Event label; GC; Gravity corer; KOMEX I; Latitude of event; Longitude of event; LV28; LV28-2-4; LV28-40-5; LV28-43-5; Reservoir effect/correction; Sea of Okhotsk; Stage
    Type: Dataset
    Format: text/tab-separated-values, 118 data points
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  • 6
    Publication Date: 2023-06-27
    Keywords: Akademik M.A. Lavrentiev; Archive of Ocean Data; ARCOD; Calculated; Counting, foraminifera, planktic; DEPTH, sediment/rock; GC; Globigerina bulloides; Globigerina quinqueloba; Globigerinita bradyi; Globigerinita glutinata; Globigerinoides ruber; Globigerinoides sacculifer; Globoquadrina dutertrei; Globoquadrina pachyderma dextral; Globoquadrina pachyderma sinistral; Globorotalia scitula; Gravity corer; KOMEX I; LV28; LV28-42-5; Number of tests; Sea of Okhotsk; Sum
    Type: Dataset
    Format: text/tab-separated-values, 725 data points
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  • 7
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    PANGAEA
    In:  P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow | Supplement to: Bubenshchikova, N V (2003): Pliocene-Lower Quaternary planktonic foraminiferal biostratigraphy and paleoceanology, ODP Hole 677A. Stratigrafiya. Geologicheskaya Korrelyatsiya (Stratigraphy. Geological Correlation): In Russian, 11(3), 91-103
    Publication Date: 2024-01-09
    Description: Planktonic foraminifera from Pliocene - Early Quaternary sediments of ODP Hole 111-677A were studied in detail. It was shown that the majority of detected zonal taxa are reliable biostratigraphic reference points. Between 30 and 210 m in the core zones of planktonic foraminifera from PL1b to Pt1 (according to the W.A. Berggren scale) were distinguished. Changes of planktonic foraminifera complexes from sediments of Hole 111-677A are closely associated with climate-controlled development of surface water masses of the Eastern Equatorial Pacific during 4.6-0.65 million years ago. Sharp decrease in equatorial-tropical species about 3.4 million years ago correlated with cessation of surface water exchange between tropical regions of the Pacific and Atlantic oceans due to formation of the Central American isthmus. The paleotemperature method of M.S Barash was used for reconstructing surface temperatures. Maximum temperatures were reconstructed in late Early Pliocene (26.4°C) and in Late Pliocene (26.6°C) and minimum ones - in the beginning of Early Pliocene (18.4°C), in the middle of Late Pliocene (19.6°C). Cold events occurred: 4.6-4.3, 2.8-2.5, and 1.7-1.2 million years ago, and warm: 4.3, 4.18-3.4, 2.5-2.3, and 1 million years ago. In general, the middle of Early Pliocene, the middle of late Pliocene and early Pleistocene are characterized by cold-water conditions, and the end of Early and the end of Late Pliocene - by warm-water conditions.
    Keywords: 111-677A; Archive of Ocean Data; ARCOD; Beella praedigitata; Calculated; Candeina nitida; Counting, foraminifera, planktic; Dentoglobigerina altispira; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Globigerina bulloides; Globigerina decoraperta; Globigerina falconensis; Globigerina nepenthes; Globigerina quinqueloba; Globigerina rubescens; Globigerinella aequilateralis; Globigerinella calida; Globigerinella praecalida; Globigerinita glutinata; Globigerinita uvula; Globigerinoides conglobatus; Globigerinoides extremus; Globigerinoides fistulosus; Globigerinoides obliquus; Globigerinoides quadrilobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globoquadrina pseudofoliata; Globoquadrina venezuelana; Globorotalia crassaformis; Globorotalia exilis; Globorotalia flexuosa; Globorotalia inflata; Globorotalia limbata; Globorotalia margaritae; Globorotalia menardii; Globorotalia multicamerata; Globorotalia pertenuis; Globorotalia pumilio; Globorotalia puncticulata; Globorotalia scitula; Globorotalia tosaensis; Globorotalia truncatulinoides dextral; Globorotalia tumida; Globorotalia ungulata; Globorotaloides hexagonus; Joides Resolution; Leg111; Neogloboquadrina acostaensis; Neogloboquadrina dutertrei; Neogloboquadrina dutertrei blowi; Neogloboquadrina humerosa; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; Neogloboquadrina pseudopima; North Pacific Ocean; Ocean Drilling Program; ODP; Orbulina bilobata; Orbulina suturalis; Orbulina universa; Planktic foraminifera zone; Pulleniatina obliquiloculata; Pulleniatina primalis; Sample code/label; Sphaeroidinella dehiscens; Sphaeroidinellopsis kochi; Sphaeroidinellopsis paenedehiscens; Sphaeroidinellopsis seminulina; Streptochilus tokelauae; Sum; Turborotalia humilis
    Type: Dataset
    Format: text/tab-separated-values, 4223 data points
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  • 8
    Publication Date: 2016-03-02
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 9
    Publication Date: 2019-09-23
    Description: Highlights • Okhotsk Sea benthic foraminifera reveal analogy between two climatic cycles. • OMZ disappeared during glacial latest MIS 12 and latest MIS 2. • OMZ gradually intensified during TV and TI forced by close rises of sea level. • OMZ weakened during full interglacial times of MIS 11c and MIS 1. • Carbonate dissolution events appeared during MIS 11c only. Abstract Benthic foraminiferal assemblage compositions, foraminiferal and sedimentological proxies were analyzed in core MD01-2415 from the northern slope of the Okhotsk Sea to compare variations of productivity and oxygen minimum zone (OMZ) intensity during the latest marine isotope stage (MIS) 12–11c and latest MIS 2–1. The benthic assemblages reveal close similarity between the two climatic cycles. The absence of benthic assemblages during the latest MIS 12 and the presence of the low-productivity Angulogerina angulosa assemblage during the latest MIS 2 suggest the disappearance of the OMZ. This regime was related to almost perennial ice cover with periods of active ice rafting during the latest MIS 12, while it was attributed to prolonged seasonal ice cover, low surface productivity and enhanced formation of well-oxygenated water masses in the Okhotsk Sea during the latest MIS 2. In deglacial times, the OMZ gradually intensified, as evidenced by the high-productivity Uvigerina akitaensis assemblage during the early termination (T) TV and early TI and the low oxygen-tolerant Bolivina spissa assemblage during the late TV and late TI. The orbitally forced similar rises of the global sea level during TV and TI caused a large offshore supply of organic matter. Synchronously, nutrients from the melting sea ice and shelf erosion promoted high surface (mainly carbonate) productivity. As a result, a high and sustained flux of particulate, degraded and refractory organic matter enhanced oxygen consumption in bottom waters and sediments, leading to the similar gradual OMZ intensifications. The B. spissa assemblage also points to expansion of oxygen-depleted water mass from the North Pacific into the Okhotsk Sea, fostering the OMZ intensifications. The phytodetritus-related Islandiella norcrossi assemblage indicates weakening of the OMZ during full interglacial times of MIS 11c and MIS 1. After stabilization of the global sea level, nutrients were mainly delivered by regional upwelling and fluvial discharge, favoring increased biogenic opal and carbonate production in the surface water, similar to the present. In this way, moderate to high (although less than deglacial) and pulsed flux of predominantly particulate organic matter caused the weakening of the oxygen consumption and OMZ. Notably, during MIS 11c, the benthic assemblage with the dominance of the taxa with dissolution-resistant tests, such as Miliammina herzensteini, Karreriella baccata and Martinottiella communis, reflects carbonate dissolution events in sediments. These events might have been resulted from an interruption of the local surface carbonate production and inflow of more carbonate-corrosive water masses from the North Pacific driven by a drawdown of the global ocean carbonate saturation.
    Type: Article , PeerReviewed
    Format: text
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  • 10
    Publication Date: 2016-03-02
    Type: Conference or Workshop Item , NonPeerReviewed
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