Land‐ocean linkages over orbital and millennial timescales recorded in Late Quaternary sediments of the Japan Sea

Tada, Ryuji; Irino, Tomohisa; Koizumi, Itaru

doi:10.1029/1998pa900016

Cited by 361 publications

(358 citation statements)

References 41 publications

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“…The top 15 to 20 cm of the core was judged to be disturbed because fluidized sediments flowed, which affected only top two samples (Tada et al, 1999). In spite of the core disturbance observed in the core top, the core was considered to have caught the mudline because brownish oxidized layer of approximately 60 cm thick is preserved at the core top, which is comparable to the reported thickness of the oxidized layer of the Japan Sea sediments (Masuzawa, 1987).…”

Section: Methodssupporting

confidence: 60%

“…In the sequence we studied, three fining upward layers and 13 sharp contacts were also described as primary sedimentary structures within both dark and light layers (Shipboard Scientific Party, 1990). However, these fining upward layers and layers with sharp basal contact are not turbidite because they are correlatable basinwide, and the interruption of the sequence by turbidite is minimized because the site is located slightly above the basin floor (Tada et al, 1992(Tada et al, , 1999. These characteristics are shown in Figs.…”

Section: Methodsmentioning

confidence: 80%

“…The dark layers are mostly laminated whereas the light layers are homogeneous to bioturbated and the boundary between the dark and light layers are generally sharp (Tada et al, 1999). These dark-light cycle is considered to be formed by frequent repetition of anoxic and oxic bottom water environment basinwide (Tada et al, 1992(Tada et al, , 1999. In the sequence we studied, three fining upward layers and 13 sharp contacts were also described as primary sedimentary structures within both dark and light layers (Shipboard Scientific Party, 1990).…”

Section: Methodsmentioning

confidence: 99%

“…They show centimeter to decimeter-scale alternations of the dark and light layers which are correlatable within the Japan Sea (Tada et al, 1992). The dark layers are mostly laminated whereas the light layers are homogeneous to bioturbated and the boundary between the dark and light layers are generally sharp (Tada et al, 1999). These dark-light cycle is considered to be formed by frequent repetition of anoxic and oxic bottom water environment basinwide (Tada et al, 1992(Tada et al, , 1999.…”

Section: Methodsmentioning

confidence: 99%

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Quantification of aeolian dust (Kosa) contribution to the Japan Sea sediments and its variation during the last 200 ky.

Irino

Tada

2000

Geochem. J.

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In order to reconstruct past variations in the aeolian dust (Kosa) contribution to the Japan Sea, and to establish a direct link between terrestrial and marine climatic records, we have applied statistical procedures to distinguish and quantify detrital subcomponents within the detrital fraction of the late Quaternary hemipelagic sediments in the Japan Sea. Q-mode factor analysis with varimax and oblique rotation of the factors followed by multiple-regression analysis between mineral composition and factor loadings was conducted using six "detrital" elements. Four detrital subcomponents were defined, which are attributed to Kosa derived from "typical" loess, Kosa from "weathered" loess, and fine and coarse arc-derived detritus, respectively, based on comparisons with the chemical and mineral compositions of probable source materials. Using these detrital subcomponents, the variation in Kosa fraction was reconstructed for the last 200 ky. The results reveal millennial-scale as well as glacial-interglacial scale variations in Kosa contribution. Especially, millennial-scale variability of Kosa contribution suggests the presence of high frequency variation in summer monsoon precipitation in the central to east Asia during the last 200 ky.

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Section: Methodssupporting

confidence: 60%

Section: Methodsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Quantification of aeolian dust (Kosa) contribution to the Japan Sea sediments and its variation during the last 200 ky.

Irino

Tada

2000

Geochem. J.

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“…Paleoenvironmental change in this region is sensitive to latitudinal shifts of these boundaries. Climate records from central Japan and the adjacent areas are thus useful to the understanding of hemispheric climate changes in the past (e.g., Oba et al, 1991;Tada et al, 1999;Yamamoto et al, 2004;Nakagawa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Late Pleistocene variation in lignin and fatty acids from core TKN-2004 in a small mountain basin in central Japan

2014

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We generated a record of lignin and fatty acid compositions from the TK-2004 core in Takano Basin, central Japan, during 39-162 ka by TMAH-thermochemolysis-GC/MS. We tested lignin and fatty acid compositions in the sediments of a small lake (1.88 km 2 watershed) as a paleovegetation proxy to understand the responses of terrestrial vegetation in central Japan to global climate change. Variation in terrestrial organic carbon contents estimated by C/N and ∑8 was parallel to the total organic content (TOC) variation, suggesting that the inflow of terrestrial organic matter was a major factor determining the TOC. The ratio of mid-chain C 20 -C 24 n-fatty acids to short-chain C 14 -C 18 n-fatty acids (MFA/SFA ratio) and the ratio of cinnamyl to vanillyl phenols (C/V ratio) of lignin gradually increased from mid-MIS 6 to early MIS 3. The increase in both parameters suggested increase in the contribution of submerged and floating plants as the flats were expanded in the lake margin. The ratio of syringyl to vanillyl phenols (S/V ratio) corresponded to the pollen vegetation index. This correspondence indicated that the S/V ratio reflected the relative abundance of angiosperms to gymnosperms in the Takano Basin. The consistency of the S/V ratio at the site of core TKN-2004 and the other two locations suggests that the S/V ratio in a small basin is a robust proxy for terrestrial vegetation on a regional scale.

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Atlantic-Pacific seesaw and its role in outgassing CO₂during Heinrich events

et al. 2014

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[1] Paleoproxy records indicate that a marked weakening of the Atlantic Meridional Overturning Circulation (AMOC) during Heinrich events was often accompanied by a notable atmospheric CO 2 increase. However, previous modeling studies display conflicting atmospheric CO 2 responses to an AMOC shutdown. Here we use model simulations combined with paleoproxy records to show that depending on the deep and bottom water transport in the Northern and Southern Pacific Ocean during an AMOC weakening, the ocean can act either as a sink or a source of carbon. Results from idealized meltwater experiments as well as from a transient experiment covering Heinrich stadial 4 suggest that a shutdown of the AMOC during Heinrich stadials 4 (HS4) and 1 (HS1) led to an enhancement of Antarctic Bottom Water (AABW) and North Pacific Deep Water (NPDW) transport. We show that enhanced deep and bottom water transport in the Pacific Ocean ventilates deep Pacific carbon through the Southern Ocean, thus contributing to a rise in atmospheric CO 2 . This mechanism yields a good agreement between paleoproxy records and modeling results, thus highlighting the possible establishment of an Atlantic-Pacific seesaw during Heinrich stadials. Enhanced AABW and NPDW transport could account for most of the observed atmospheric CO 2 increase during HS4 and for about 30% of the atmospheric CO 2 increase during HS1.

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Land‐ocean linkages over orbital and millennial timescales recorded in Late Quaternary sediments of the Japan Sea

Cited by 361 publications

References 41 publications

Quantification of aeolian dust (Kosa) contribution to the Japan Sea sediments and its variation during the last 200 ky.

Quantification of aeolian dust (Kosa) contribution to the Japan Sea sediments and its variation during the last 200 ky.

Late Pleistocene variation in lignin and fatty acids from core TKN-2004 in a small mountain basin in central Japan

Atlantic-Pacific seesaw and its role in outgassing CO₂during Heinrich events

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Land‐ocean linkages over orbital and millennial timescales recorded in Late Quaternary sediments of the Japan Sea

Cited by 361 publications

References 41 publications

Quantification of aeolian dust (Kosa) contribution to the Japan Sea sediments and its variation during the last 200 ky.

Quantification of aeolian dust (Kosa) contribution to the Japan Sea sediments and its variation during the last 200 ky.

Late Pleistocene variation in lignin and fatty acids from core TKN-2004 in a small mountain basin in central Japan

Atlantic-Pacific seesaw and its role in outgassing CO2during Heinrich events

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Atlantic-Pacific seesaw and its role in outgassing CO₂during Heinrich events