Seki, Osamu; Ikehara, M; Kawamura, Kimitaka; Nakatsuda, T; Ohnishi, K; Wakatsuchi, M; Narita, H; Sakamoto, Tatsuhiko (2015): (Table 1) Age control points and dating methods for sediment cores of the Sea of Okhotsk [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.841213, Supplement to: Seki, O et al. (2004): Reconstruction of paleoproductivity in the Sea of Okhotsk over the last 30 kyr. Paleoceanography, 19(1), PA1016, https://doi.org/10.1029/2002PA000808
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Abstract:
Marine- and terrestrial-derived biomarkers (alkenones, brassicasterol, dinosterol, and long-chain n-alkanes), as well as carbonate, biogenic opal, and ice-rafted debris (IRD), were measured in two sediment cores in the Sea of Okhotsk, which is located in the northwestern Pacific rim and characterized by high primary productivity. Down-core profiles of phytoplankton markers suggest that primary productivity abruptly increased during the global Meltwater Pulse events 1A (about 14 ka) and 1B (about 11 ka) and stayed high in the Holocene. Spatial and temporal distributions of the phytoplankton productivity were found to be consistent with changes in the reconstructed sea ice distribution on the basis of the IRD. This demonstrates that the progress and retreat of sea ice regulated primary productivity in the Sea of Okhotsk with minimum productivity during the glacial period. The mass accumulation rates of alkenones, CaCO3, and biogenic opal indicate that the dominant phytoplankton species during deglaciation was the coccolithophorid, Emiliania huxleyi, which was replaced by diatoms in the late Holocene. Such a phytoplankton succession was probably caused by an increase in silicate supply to the euphotic layer, possibly associated with a change in surface hydrography and/or linked to enhanced upwelling of North Pacific Deep Water.
Further details:
Gorbarenko, Sergey A; Khusid, Tatyana A; Basov, Ivan A; Oba, Tadamichi; Southon, John R; Koizumi, Itaru (2002): Glacial Holocene environment of the southeastern Okhotsk Sea: evidence from geochemical and palaeontological data. Palaeogeography, Palaeoclimatology, Palaeoecology, 177(3-4), 237-263, https://doi.org/10.1016/S0031-0182(01)00335-2
Gorbarenko, Sergey A; Nürnberg, Dirk; Derkachev, A N; Astakhov, Anatolii S; Southon, John R; Kaiser, André (2002): Magnetostratigraphy and tephrochronology of the Upper Quaternary sediments in the Okhotsk Sea: implication of terrigenous, volcanogenic and biogenic matter supply. Marine Geology, 183(1-4), 107-129, https://doi.org/10.1016/S0025-3227(02)00164-0
Coverage:
Median Latitude: 50.294433 * Median Longitude: 148.817200 * South-bound Latitude: 49.488300 * West-bound Longitude: 146.128300 * North-bound Latitude: 51.000000 * East-bound Longitude: 152.000000
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 10.650 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 6 | Age, comment | Comm | Seki, Osamu | |||
| 7 | Age model | Age model | ka | Seki, Osamu | ||
| 8 | Sedimentation rate | SR | cm/ka | Seki, Osamu | based on the depth interval of the given depth and the depth below |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
87 data points