Paleoceanographic change off central Japan since the last 144,000 years based on high-resolution oxygen and carbon isotope records

Oba, Tadamichi; Irino, Tomohisa; Yamamoto, Masanobu; Takamura, Akira; Aoki, Kaori

doi:10.1016/j.gloplacha.2006.05.002

Cited by 89 publications

(63 citation statements)

References 46 publications

(61 reference statements)

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“…1 Sagawa et al (2006) confirmed the high quality of the core by comparing the sediment colour and planktic foraminiferal δ 18 O between this core and MD01-2421, another IMAGES piston core adjacent to the MD01-2420 site with well-established age control (Oba and Murayama, 2004;Oba et al, 2006). …”

Section: Sediment Samplesmentioning

confidence: 54%

Ventilation changes in the western North Pacific since the last glacial period

et al. 2012

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Abstract.We reconstructed the ventilation record of deep water at 2100 m depth in the mid-latitude western North Pacific over the past 25 kyr from radiocarbon measurements of coexisting planktic and benthic foraminiferal shells in sediment with a high sedimentation rate. The 14 C data on fragile and robust planktic foraminiferal shells were concordant with each other, ensuring high quality of the reconstructed ventilation record. The radiocarbon activity changes were consistent with the atmospheric record, suggesting that no massive mixing of old carbon from the abyssal reservoir occurred throughout the glacial to deglacial periods.

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Section: Sediment Samplesmentioning

confidence: 54%

Ventilation changes in the western North Pacific since the last glacial period

et al. 2012

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“…The high sedimentation rate of Core MD01-2421 (average 33 cm ka À1 ) allowed us to achieve a much higher resolution analysis than has been attained previously. The Kashima Core Research Group investigated this core for foraminiferal oxygen isotopes (Oba and Murayama, 2004;Oba et al, 2006), planktonic foraminiferal assemblages (Niimura et al, 2006), the Mg/Ca ratio (Sagawa et al, 2006), diatom assemblages (Koizumi et al, 2004), nannofossil assemblages (Aizawa et al, 2004), U K 0 37 (Yamamoto et al, 2004(Yamamoto et al, , 2005bIsono et al, unpublished data), organic carbon content and isotopes (Ueshima et al, 2006), pollen and spores (Igarashi and Oba, 2006) and lignin (Yamamoto et al, 2005a).…”

Section: Japan Marginmentioning

confidence: 99%

Response of mid‐latitude North Pacific surface temperatures to orbital forcing and linkage to the East Asian summer monsoon and tropical ocean–atmosphere interactions

Yamamoto¹

2009

J Quaternary Science

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Yamamoto, M. 2009. Response of mid-latitude North Pacific surface temperatures to orbital forcing and linkage to the East Asian summer monsoon and tropical oceanatmosphere interactions.ABSTRACT: We present a palaeoceanographic perspective of the North Pacific during the last two glacial cycles based on U K 0 37 -derived palaeotemperature records of IMAGES Core MD01-2421 off the coast of central Japan and cores from the Ocean Drilling Program (ODP) Sites 1014 and 1016 off the coast of California. The sea surface temperature (SST) differences between ODP Sites 1014 and 1016 (DSST northeastern Pacific (NEP) ¼ SST ODP1014 -SST ODP1016 ) indicate the intensity of the California Current. Comparison of DSST NEP and the SST from Core MD01-2421 revealed anti-phase variation; high DSST NEP (indicating weakening of the California Current) corresponded to low SST at the Japan margin (indicating the southward displacement of the north-western Pacific subarctic boundary and weakening of the Kuroshio Extension), and vice versa. This finding suggests that the intensity of the North Pacific subtropical gyre circulation has varied in response to precessional forcing and that this response has been linked with changes in tropical ocean-atmosphere interactions. In the precessional cycle, the SST variation derived from Core MD01-2421 lags ca. 2.5-4 ka behind the variations shown by Hulu and Sanbao stalagmite d 18 O records and by the pollen temperature index from Core MD01-2421, suggesting out-of-phase variations of the North Pacific subtropical gyre circulation and the East Asian summer monsoon. These findings indicate that the behaviour of interactions between tropical oceanatmosphere dynamics and the East Asian summer monsoon may have varied in response to the precessional cycle.

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“…1). The lithology and age model were presented in Oba et al (2005). A total of 95 samples were collected from the core.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, the latitudinal displacement of the oceanic subarctic boundary was reconstructed from the penultimate glacial period (MIS-6) using a giant piston core MD01-2421 taken off the Honshu Island of central Japan in the NW Pacific. This record showed that the subarctic boundary was displaced in response to changes in the Earth's precession (Yamamoto et al, 2004;Aizawa et al, 2004;Koizumi et al, 2004;Oba et al, 2005).…”

Section: Introductionmentioning

confidence: 98%

Late Quaternary variation of lignin composition in core MD01-2421 off central Japan, NW Pacific

Yamamoto

Ichikawa

Igarashi³

et al. 2005

Palaeogeography, Palaeoclimatology, Palaeoecology

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In order to understand the responses of terrestrial vegetation in central Japan to global climate changes, we have generated the record of lignin composition from Core MD01-2421 off central Japan in the NW Pacific during the last 145,000 years by TMAH-pyrolysis-GC/MS. The relative abundance of lignin was significantly low in early MIS-1 and MIS-5e and higher in MIS-5c to early MIS-4. This reflects glacial-interglacial changes in sea level and riverine runoff. The ratio of syringyl (S)-to vanillyl (V)-phenols (S/V ratio), which is a contribution index of angiosperms against gymnosperms, was lower in MIS-2, MIS-4 and MIS-6, reflecting the glacial-interglacial variation of air temperature. The ratio of cinnamyl (C)-to vanillyl (V)-phenols (C/V ratio), which indicates the contribution of grasses, was higher in late MIS-2, early-mid 1 MIS-3 and MIS-6. The periods of higher C/V ratio correspond to the periods of lower sea surface temperatures (SSTs), suggesting a dry and cold climate in late MIS-2, mid-MIS-3 and MIS-6.

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Paleoceanographic change off central Japan since the last 144,000 years based on high-resolution oxygen and carbon isotope records

Cited by 89 publications

References 46 publications

Ventilation changes in the western North Pacific since the last glacial period

Ventilation changes in the western North Pacific since the last glacial period

Response of mid‐latitude North Pacific surface temperatures to orbital forcing and linkage to the East Asian summer monsoon and tropical ocean–atmosphere interactions

Late Quaternary variation of lignin composition in core MD01-2421 off central Japan, NW Pacific

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