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  • 1
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    (Table 1) Oxygen isotope composition and comparison between ages and sea surface temperature from sediment core KH-79-3_L-3
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: The Japan Sea experienced bottom water anoxia at the last glacial maximum (LGM) since it is surrounded by four shallow straits, the sill depths of which are close to, or shallower than, the drop in sea level (~120 m) that occurred then. A distinctive negative d18O excursion of planktonic foraminifera also took place during the LGM. This excursion has been interpreted from foraminiferal data as recording a drop in the paleosalinity of surface waters on the assumption of a constant low sea surface temperatures between 34 and 11 ka. We present here a profile of alkenone-based sea surface temperatures (alkenone-SSTs) over the past 36 kyr. Our results suggest that SSTs during the LGM were much higher than those previously assumed. After considering the factors that might affect estimation of alkenone-SSTs and comparisons of core-top alkenone-SSTs values with values for modern seawater we conclude that the higher alkenone-SSTs during the LGM are reliable and reasonable. These warm SSTs were probably caused by radiative equilibrium associated with the development of stable water stratification in the Japan Sea during the LGM.
    Keywords: Age model; Calculated; Calculated from UK37 (Prahl et al., 1988); Calendar age; Cassidulina japonica, δ18O; DEPTH, sediment/rock; GC; Gravity corer; KH-79-3_L3; L3; Neogloboquadrina pachyderma dextral and/or sinistral, δ18O; Oki Ridge; Sea surface temperature; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 94 data points
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    DATA PANGAEA
  • 2
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    (Table 1) Bulk geochemistry of sediment cores KH-79-3_L3 and KH-79-3_C3 (1999)
    PANGAEA
    In:  Supplement to: Ishiwatari, Ryoshi; Yamada, Keita; Houtatsu, M; Naraoka, Hiroshi (1999): Organic molecular and carbon isotopic records of the Japan Sea over the past 30 kyr. Paleoceanography, 14(2), 260-270, https://doi.org/10.1029/1998PA900014
    Details
    Publication Date: 2023-07-07
    Description: The organic and isotopic geochemical study of two sediment cores (KH-79-3, L-3, and KH-79-3, C-3) from the Oki Ridge in the Japan Sea has revealed that total organic carbon (TOC) mass accumulation rates are extremely high in the 12-11 ka (calendar age) interval and TOC in the sections in the 24-17 ka interval is depleted in 13C by 3.5 per mil relative to Holocene sediments. Alkenone sea surface temperature (SST) shows a decrease from 18° to 14°C from 17.5 to 11.6 ka and a sharp increase from 14° to 19°C from 11.6 to 11.1 ka. The SST changes are associated with the inflow of cold seawater with the vertical water mixing and the inflowof warm Tsushima Current into the Japan Sea. The d13C values for both 24-methylcholesta-5,22-dien-3?-ol (diatom marker) and dinosterol (dinoflagellate marker), are at their minimum from 24 to 17 ka, while those for long-chain alkenones are not. The theoretical considerations on d13C for biomarkers suggest low photosynthetic carbon demand of diatoms and dinoflagellates from 24 to 17 ka.
    Keywords: AGE; Carbon, organic, total; Carbon/Nitrogen ratio; Comment; DEPTH, sediment/rock; Event label; GC; Gravity corer; KH-79-3_C3; KH-79-3_L3; L3; Oki Ridge; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 172 data points
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    DATA PANGAEA
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