Oceanographic investiations from the Sea of Ochotsk

• Main Author: Kaiser, André
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: 2182; 2185; Akademik A Nesmeyanov; Akademik M.A. Lavrentiev; GC; GC_POI; Gravity corer; Gravity corer (Kiel type); Gravity corer (POI); KAL; Kasten corer; KOMEX; KOMEX I; Kurile-Okhotsk Sea Marine Experiment; LV27/GREGORY; LV27-10-1; LV27-10-5; LV27-12-2; LV27-12-3; LV27-15-1; LV27-4-2; LV27-4-3; LV27-5-4; LV27-5-5; LV27-7-2; LV27-7-3; LV27-8-2; LV27-8-3; LV27-9-4; LV28; LV28-2-2; LV28-2-3; LV28-34-1; LV28-34-2; LV28-40-3; LV28-40-4; LV28-41-3; LV28-41-4; LV28-42-3; LV28-42-4; LV28-4-3; LV28-4-4; LV28-44-2; LV28-44-3; MUC; MultiCorer; OK92; OK92_2182; OK92_2185; Sea of Okhotsk; Okhotsk; Pacific; Kamchatka; okhotsk sea; Sakhalin; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.743860; https://doi.org/10.1594/PANGAEA.743860

The Sea of Okhotsk is a marginal sea of the Pacific Ocean, which is characterized by strong variations in the productivity and sediment supply due to sea ice transport and river input. Furthermore the variations in the hydrological cycle determine the formation of the SOIW (Sea of Okhotsk Intermediate Water) which plays an important role in the ventilation processes in the intermediate water of the N-Pacific. Isotope data measured on planktonic and benthic foraminifera, sedimentological and geochemical studies of sediment cores and surface samples from the Sea of Okhotsk are used to reconstruct the paleoceanography during the past 350.000 years. The dating and correlation of the sediments are based on oxygen isotope stratigraphy, absolute ages, magnetic susceptibility as well as a detailled tephrachronology of the entire basin. The sedimentation rates are characterized by temporal and spatial variations. The maximum sedimentation rate takes place at the continental slope off Sakhalin due to the input of the Amur River, the sea ice drift and the high productivity. The sedimentation rate in the eastern part of the Sea of Okhotsk is generelly high because of the influence of the nutrient-rich Kamchatka Current. In the central and northern parts of the Sea of Okhotsk, areas with low productivity and reduced terrestrial supply, the sedimentation rate is the lowest. The analyses of the surface sediment samples make it possible to characterize the (sub)- recent sediment supply and transportation processes. The bulk sediment measurements, isotope data and the accumulation rate of ice-rafted debris (IRD) show a dominant sea ice cover and a region with a high productivity as well as a high Amur River input in the western part of the sea. The eastern part of the Sea of Okhotsk, however, is marked by the predominance of warm and nutrient-rich water masses coming from the Kamchatka Current which restricts the sea ice cover. This is reflected in low content of ice-rafted debris and high productivity proxies as well as in ...