Site U1427

Tada, Ryuji; Murray, R. W.; Zarikian, C.A. Alvarez; Anderson, William T.; Bassetti, Maria Angela; Brace, B.J.; Clemens, S.C.; Gurgel, M.H. da Costa; Dickens, G. R.; Dunlea, Ann G.; Gallagher, S.J.; Giosan, Liviu; Henderson, A.C.G.; Holbourn, Ann; Ikehara, Ken; Irino, Tomohisa; Itaki, Takuya; Karasuda, Akinori; Kinsley, Christopher W.; Kubota, Yoshimi; Lee, G.S.; Lee, K.E.; Lofi, Johanna; Lopes, C.I.C.D.; Peterson, L.C.; Saavedra‐Pellitero, Mariem; Sagawa, Takuya; Singh, Raj K.; Sugisaki, Saiko; Toucanne, Samuel; Wan, Sui; Xuan, Chuang; Zheng, Hairong; Ziegler, Martin

doi:10.2204/iodp.proc.346.108.2015

Cited by 14 publications

(28 citation statements)

References 64 publications

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“…For example, the half APC enabled us to recover the deepest piston core in Deep Sea Drilling Project (DSDP)/Ocean Drilling Program (ODP)/IODP history (Core 346-U1427A-81H from 486.5 to 490.4 m core depth below seafloor, Method A [CSF-A]). This achievement was also the deepest continuously recovered piston cored sequence, initiated at the seafloor and penetrating 490.4 m solely by piston coring (see "Operations" in the "Site U1427" chapter [Tada et al, 2015c]). …”

Section: Coring and Drilling Operationsmentioning

confidence: 89%

Methods

Tada¹,

Murray²,

Zarikian³

et al. 2015

Proceedings of the IODP

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Section: Coring and Drilling Operationsmentioning

confidence: 89%

Methods

Tada¹,

Murray²,

Zarikian³

et al. 2015

Proceedings of the IODP

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“…Sourced from Chinzei et al (1987), Veron (1992), Kuroyanagi and Kawahata (2004), Tsuchiya et al (2004), Yamano et al (2001Yamano et al ( , 2012, Gallagher et al (2009), Hoiles et al (2012, and Tada et al (2015). A list of diatom proxies is included in Table 2 Megangulus zyonoensis, and Mercenaria stimpsoni; Kitamura et al 1994) are those living in the area north of the southern Hokkaido and/or deeper than 150-160 m depth off Sanin and Hokuriku (Fig.…”

Section: Psammocora Superficialismentioning

confidence: 99%

The Pliocene to recent history of the Kuroshio and Tsushima Currents: a multi-proxy approach

Gallagher

Kitamura

Iryu

et al. 2015

Prog. in Earth and Planet. Sci.

159

121

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The Kuroshio Current is a major western boundary current controlled by the North Pacific Gyre. It brings warm subtropical waters from the Indo-Pacific Warm Pool to Japan exerting a major control on Asian climate. The Tsushima Current is a Kuroshio offshoot transporting warm water into the Japan Sea. Various proxies are used to determine the paleohistory of these currents. Sedimentological proxies such as reefs, bedforms, sediment source and sorting reveal paleocurrent strength and latitude. Proxies such as coral and mollusc assemblages reveal past shelfal current activity. Microfossil assemblages and organic/inorganic geochemical analyses determine paleo-sea surface temperature and salinity histories. Transportation of tropical palynomorphs and migrations of Indo-Pacific species to Japanese waters also reveal paleocurrent activity. The stratigraphic distribution of these proxies suggests the Kuroshio Current reached its present latitude (35°N) by~3 Ma when temperatures were 1 to 2°C lower than present. At this time a weak Tsushima Current broke through Tsushima Strait entering the Japan Sea. Similar oceanic conditions persisted until~2 Ma when crustal stretching deepened the Tsushima Strait allowing inflow during every interglacial. The onset of stronger interglacial/glacial cycles~1 Ma was associated with increased North Pacific Gyre and Kuroshio Current intensity. This triggered Ryukyu Reef expansion when reefs reached their present latitude (~31°N), thereafter the reef front advanced (~31°N) and retreated (~25°N) with each cycle. Foraminiferal proxy data suggests eastward deflection of the Kuroshio Current from its present path at 24°N into the Pacific Ocean due to East Taiwan Channel restriction during the Last Glacial Maximum. Subsequently Kuroshio flow resumed its present trajectory during the Holocene. Ocean modeling and geochemical proxies show that the Kuroshio Current path may have been similar during glacials and interglacials, however the glacial mode of this current remains controversial. Paleohistorical studies form important analogues for current behavior with future climate change, however, there are insufficient studies at present in the region that may be used for this purpose. Modeling of the response of the Kuroshio Current to future global warming reveals that current velocity may increase by up to 0.3 m/sec associated with a northward migration of the Kuroshio Extension.

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“…While principally drilled for paleoceanographic objectives, an additional focus at these sites in the southern marginal sea was generation of high-resolution IW profiles for a wide array of dissolved species. This mission was accomplished, but as noted in the "Site U1426" and "Site U1427" chapters (Tada et al, 2015b(Tada et al, , 2015c, there were some data irregularities with shipboard SO 4 2-and Ba measurements (Fig. F2).…”

Section: Introductionmentioning

confidence: 95%

“…On the ship, this included salinity, alkalinity and pH, major anions (Cl -, SO 4 2-, Br -) and cations (Ca, Mg, K, Na), minor elements (B, Ba, Fe, Li, Mn, Sr), ammonium (NH 4 + ), phosphate (PO 4 3-), silica (H 4 SiO 4 ), hydrogen sulfide (HS -), and "yellowness." The results of these analyses were presented in the "Site U1426" and "Site U1427" chapters (Tada et al, 2015b(Tada et al, , 2015c.…”

Section: Interstitial Water Collectionmentioning

confidence: 99%

“…Site U1427 is located at 35°57.92′N, 134°26.06′E, and 330 m water depth. Three holes at Site U1427 cored 548, 405, and 351 mbsf with a recovery <98.9% (see the "Site U1427" chapter [Tada et al, 2015c]). While principally drilled for paleoceanographic objectives, an additional focus at these sites in the southern marginal sea was generation of high-resolution IW profiles for a wide array of dissolved species.…”

Section: Introductionmentioning

confidence: 99%

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Data report: reanalysis of interstitial water barium, iron, and sulfur concentrations at Sites U1426 and U1427

Miller¹,

Dickens²

2017

Proceedings of the IODP

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Within the south of the marginal sea between Japan and Korea, interstitial water (IW) profiles exhibit a prominent sulfate-methane transition (SMT) in the upper few meters of sediment. As the SMT has become a focus of attention, IW samples were collected at high spatial resolution within shallow sediment at Sites U1426 and U1427 and examined on board the R/V JOIDES Resolution, under the auspices of the Integrated Ocean Drilling Program, for a wide range of dissolved species. However, irregularities were noted for the sulfate (SO 4 2-), Ba, and Fe concentration profiles, each of importance to understanding the SMT. Splits of 134 IW samples, prepared with HNO 3 during the expedition, were therefore reanalyzed at Rice University for S, Ba, and Fe, with S as a proxy for SO 4 2-. Results of 134 samples included 29 duplicates with low percent difference (0.01%-34.69%, 0.01%-14.90%, and 0.03%-35.19%) and 6 spiked blanks with low percent error relative to stock solution concentration (1.59%, 2.41%, and 4.11%). The shore-based S and Ba profiles have trends similar to those determined on ship but with obvious offsets. The remeasured Fe profiles are comparable to those measured on ship, albeit with more data points. Although the IW samples were measured between 95 and 113 days after the expedition, the new results have high data reproducibility, render smooth profiles, and give more expected chemistry across the SMTs. For these three elements, we suggest the new results should replace the shipboard data.

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Site U1427

Abstract: Chapter contents Background and objectives. .

Cited by 14 publications

References 64 publications

Methods

Methods

The Pliocene to recent history of the Kuroshio and Tsushima Currents: a multi-proxy approach

Data report: reanalysis of interstitial water barium, iron, and sulfur concentrations at Sites U1426 and U1427

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