Surface water hydrography of the Kuroshio Extension during the Pliocene–Pleistocene climate transition

Venti, Nicholas L.; Billups, Katharina

doi:10.1016/j.marmicro.2013.02.004

Cited by 9 publications

(13 citation statements)

References 55 publications

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“…Decreased nannofossil abundance from MIS 7 onward at Site 1209B, associated with increased biogenic opal and foraminifera observed at neighboring sites (Kawahata et al ., ; Yamane, ; Chiyonobu et al ., ), underlines a significant modification of the surface water mass towards the modern configuration after the MIS 7/8 transition (∼243 ka in LR04), further amplifying a trend of increased North Pacific seasonality that began during the Plio‐Pleistocene climate transition (Haug et al ., ; Venti and Billups, ). From MIS 7 onward, intensification of the East Asian Monsoon probably strengthened seasonality: warmer late‐summer and autumn and colder winter–spring SSTs, causing alternation between intensely stratified and vertically mixed surface waters after 243 ka as also proposed by Chiyonobu et al .…”

Section: Discussionmentioning

confidence: 99%

Coccolithophore carbonate during the last 450 ka in the NW Pacific Ocean (ODP site 1209B, Shatsky Rise)

Bordiga

Cobianchi

Lupi

et al. 2013

J Quaternary Science

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This study focuses on Pleistocene–Holocene sediments from the Shatsky Rise (Ocean Drilling Program Site 1209B, NW Pacific Ocean). We quantify the contribution of calcite made by coccoliths in oceanic sediments, investigating the role of calcareous nannoplankton during the last 450 ka. Coccolith carbonate constitutes 60–90% of bulk carbonate. Coccolith carbonate accumulation rates (CARs) and CaCO3 fine fraction confirm that coccolithophores are major contributors to the carbonate export and accumulation. Primary productivity shows highest values from marine isotope stage (MIS) 12 to 8. Thereafter, although coccolith calcite content remains high, other sediment components, such as as foraminifera and biogenic opal, seem to be favored, perhaps related to an increase in fertilization by eolian dust. Our results demonstrate the important role of coccolithophore production and sedimentation on the regulation of ocean carbonate chemistry on time scales >1000–100 000 years. On glacial–interglacial scales, coccolithophore productivity could have affected deep‐water saturation by buffering deep‐sea CO2 through increased carbonate dissolution episodes. Spectral and wavelet analyses are consistent with CARs primarily driven by glacial–interglacial variability and obliquity‐controlled changes. Coccolith‐based paleoceanographic reconstructions allow us to establish that during the last 450 ka the mid‐latitudes of the NW Pacific are controlled by the dynamics of the El Niño Southern Oscillation perturbations and Boreal Monsoon system.

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Section: Discussionmentioning

confidence: 99%

Coccolithophore carbonate during the last 450 ka in the NW Pacific Ocean (ODP site 1209B, Shatsky Rise)

Bordiga

Cobianchi

Lupi

et al. 2013

J Quaternary Science

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“…Alkenone MARs were calculated from the C 37 concentration measured at Site 1208. Thus, the data parallel the Site 1208 orbital‐scale stable isotope and alkenone‐derived SST records [ Venti and Billups , , ; Venti et al ., ]. Alkenone measurements follow continuous 10 cm spacing between 86.44 m below seafloor (bsf) (1.76 Ma) and 135.95 m bsf (3.00 Ma) and were conducted at Brown University following standard techniques.…”

Section: Methodsmentioning

confidence: 60%

Paleoproductivity in the northwestern Pacific Ocean during the Pliocene‐Pleistocene climate transition (3.0–1.8 Ma)

2017

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Alkenone mass accumulation rates (MARs) provide a proxy for export productivity in the northwestern Pacific (Ocean Drilling Program Site 1208) spanning the late Pliocene through early Pleistocene (3.0–1.8 Ma). We investigate changes in productivity associated with global cooling during the onset and expansion of Northern Hemisphere glaciation (NHG). Alkenone MARs vary on obliquity timescales throughout, but the amplitude increases at 2.75 Ma concurrent with the intensification of NHG and cooling of the sea surface by 3°C. The obliquity‐scale variations in alkenone MARs parallel shipboard measurements of sediment color reflectance (%) with higher MARs significantly correlated (>95%) with darker (opal‐rich) intervals. Variations in both lead benthic foraminiferal δ18O values by 1.5–2 kyr suggesting that export productivity may be a contributing factor, rather than a response, to the extent of continental glaciation. The biological pump is therefore a plausible mechanism for transferring atmospheric CO2 into the deep ocean during the onset of NHG and the ensuing obliquity‐dominated climate regime. Obliquity‐scale correlation between productivity and magnetic susceptibility is consistent with a link via westerly winds delivering terrigenous sediments and mixing the upper water column. Alkenone MARs also contain a ~400 kyr modulation. Because this periodicity is a multiple of the residence time of carbon in the ocean, it may reflect inputs of new nutrients associated with eccentricity‐forced changes in the terrestrial biosphere and weathering. We ascribe these findings to interactions between the East Asian winter monsoon and productivity in the North Pacific Ocean, perhaps contributing to Plio‐Pleistocene climate change.

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“…Magnetic reversal boundaries at all sites are robust, with nearly all chrons and subchrons through the late Neogene identified, along with the most calcareous nannoplanton biozones (Bralower et al., 2002). All records from Hole 1208A re‐plotted in this paper (Abell et al., 2021; Venti & Billups, 2013) were also put on the age models of Lam and Leckie (2020b). We believe our age models to be robust, as we pulled the benthic foraminiferal δ 18 O data from Venti and Billups (2013) onto our age model and compared the data to that on their tuned age model.…”

Section: Methodsmentioning

confidence: 99%

“…All records from Hole 1208A re‐plotted in this paper (Abell et al., 2021; Venti & Billups, 2013) were also put on the age models of Lam and Leckie (2020b). We believe our age models to be robust, as we pulled the benthic foraminiferal δ 18 O data from Venti and Billups (2013) onto our age model and compared the data to that on their tuned age model. No appreciable offsets were noted.…”

Section: Methodsmentioning

confidence: 99%

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Pliocene to Earliest Pleistocene (5–2.5 Ma) Reconstruction of the Kuroshio Current Extension Reveals a Dynamic Current

Lam

MacLeod

Schilling

et al. 2021

Paleoceanog and Paleoclimatol

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Western boundary currents flow along the western edge of ocean basins, transporting vast amounts of heat and moisture from equatorial regions to higher latitudes. The Kuroshio Current (KC) and the Kuroshio Current Extension (KCE) is the western boundary current system of the North Pacific Subtropical Gyre (Figure 1). The KC originates from the westward-flowing North Equatorial Current and has an estimated volume transport of 23.7-25.0 Sverdrup (Sv; 1 Sv = 1 million cubic meters per second) (Ichikawa & Beardsley, 1993). The current flows past the Izu Ridge until it separates from the Japan coast at approximately 36°N, 141°E flowing east into the Pacific Ocean (Imawaki et al., 2013) where it becomes the KCE. Maximum transport volume of the KCE has been estimated to reach up to 130 Sv (Wijffels et al., 1998). Thus, the KCE jet alone provides massive amounts of heat and moisture for North Pacific midlatitude cyclones. By modifying the path and intensity of storm tracks, changes to the dynamic state of the KCE can alter the stability and pressure gradient within the local atmospheric layers and basin-scale wind stress patterns (Frankignoul & Sennechael, 2007;Kwon et al., 2010) which, in turn, influences atmospheric processes affecting precipitation patterns over Japan and the west coast of North America (Latif & Barnett, 1994).The KCE region is one of the most dynamic and important regions of the world's ocean. Meeting of subtropical water masses brought north by the KC with southward flowing subpolar waters by the Oyashio Current (Figure 1) creates a relatively steep temperature gradient across these currents in the northwest Pacific. This condition leads to annual average water temperatures differing by about 8°C from 35°N to 40°N across the KCE and Oyashio Current (Locarnini et al., 2013). Measurements of air-sea CO 2 fluxes over

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Surface water hydrography of the Kuroshio Extension during the Pliocene–Pleistocene climate transition

Cited by 9 publications

References 55 publications

Coccolithophore carbonate during the last 450 ka in the NW Pacific Ocean (ODP site 1209B, Shatsky Rise)

Coccolithophore carbonate during the last 450 ka in the NW Pacific Ocean (ODP site 1209B, Shatsky Rise)

Paleoproductivity in the northwestern Pacific Ocean during the Pliocene‐Pleistocene climate transition (3.0–1.8 Ma)

Pliocene to Earliest Pleistocene (5–2.5 Ma) Reconstruction of the Kuroshio Current Extension Reveals a Dynamic Current

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