Pliocene and Pleistocene paleoceanography in the western subarctic Pacific based on diatom analyses of ODP Leg 145 Hole 884B and IODP Expedition 323 Holes U1341B and U1343E

Kato, Y.; Onodera, Jonaotaro; Suto, Itsuki; Teraishi, Akihito; Takahashi, Kozo

doi:10.1016/j.dsr2.2015.04.004

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…1a), and its properties are dominated by nutrient and meltwater supply from the coastal Alaskan glaciers (Spies, 2007). Further offshore, the Alaska Current (AC) also flows anticlockwise, controlled in strength by the Alaska Gyre (Kato et al, 2016) (Fig. 1a).…”

Section: Study Areamentioning

confidence: 99%

Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures

et al. 2020

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Abstract. The initiation and evolution of the Cordilleran Ice Sheet are relatively poorly constrained. International Ocean Discovery Program (IODP) Expedition 341 recovered marine sediments at Site U1417 in the Gulf of Alaska (GOA). Here we present alkenone-derived sea surface temperature (SST) analyses alongside ice-rafted debris (IRD), terrigenous, and marine organic matter inputs to the GOA through the late Pliocene and early Pleistocene. The first IRD contribution from tidewater glaciers in southwest Alaska is recorded at 2.9 Ma, indicating that the Cordilleran Ice Sheet extent increased in the late Pliocene. A higher occurrence of IRD and higher sedimentation rates in the GOA during the early Pleistocene, at 2.5 Ma, occur in synchrony with SSTs warming on the order of 1 ∘C relative to the Pliocene. All records show a high degree of variability in the early Pleistocene, indicating highly efficient ocean–climate–ice interactions through warm SST–ocean evaporation–orographic precipitation–ice growth mechanisms. A climatic shift towards ocean circulation in the subarctic Pacific similar to the pattern observed during negative Pacific Decadal Oscillation (PDO) conditions today occurs with the development of more extensive Cordilleran glaciation and may have played a role through increased moisture supply to the subarctic Pacific. The drop in atmospheric CO2 concentrations since 2.8 Ma is suggested as one of the main forcing mechanisms driving the Cordilleran glaciation.

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Section: Study Areamentioning

confidence: 99%

Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures

et al. 2020

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“…9). Although diatom data from other cored sites are low resolution (1-4 samples during MIS 11) (Kato et al, 2016;Onodera et al, 2016;Stroynowski et al, 2015;Teraishi et al, 2016), they provide a snapshot of diatom assemblages during MIS 11. Sea ice diatoms contribute approximately 30 % of the diatom assemblages at the two slope sites, U1345 (this study) and U1343 , and between 10 and 20 % of the assemblage at the eastern Bowers Ridge site (U1340) (Stroynowski et al, 2015), but less than 2 % of the assemblage on the western flanks of Bowers Ridge (U1341) .…”

Section: The Bering Sea In the Context Of Regional And Global Variabimentioning

confidence: 99%

“…Sea ice diatoms contribute approximately 30 % of the diatom assemblages at the two slope sites, U1345 (this study) and U1343 , and between 10 and 20 % of the assemblage at the eastern Bowers Ridge site (U1340) (Stroynowski et al, 2015), but less than 2 % of the assemblage on the western flanks of Bowers Ridge (U1341) . In the North Pacific (ODP Site 884), no sea ice diatoms are present during MIS 11 (Kato et al, 2016). Site U1341 contained an assemblage high in dicothermal indicators such as Shionodiscus trifultus and Actinocyclus curvatulus, oceanic front indicators such as Rhizosolenia hebetata, and N. seminae , while the North Pacific (Site 884) assemblage is dominated by dicothermal indicators during MIS 11 (Kato et al, 2016).…”

Section: The Bering Sea In the Context Of Regional And Global Variabimentioning

confidence: 99%

“…In the North Pacific (ODP Site 884), no sea ice diatoms are present during MIS 11 (Kato et al, 2016). Site U1341 contained an assemblage high in dicothermal indicators such as Shionodiscus trifultus and Actinocyclus curvatulus, oceanic front indicators such as Rhizosolenia hebetata, and N. seminae , while the North Pacific (Site 884) assemblage is dominated by dicothermal indicators during MIS 11 (Kato et al, 2016). Percent opal declines at Bowers Ridge during early MIS 11 at the same time as it increases at the slope sites (Iwasaki et al, 2016) (Fig.…”

Section: The Bering Sea In the Context Of Regional And Global Variabimentioning

confidence: 99%

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Bering Sea surface water conditions during Marine Isotope Stages 12 to 10 at Navarin Canyon (IODP Site U1345)

et al. 2016

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Abstract. Records of past warm periods are essential for understanding interglacial climate system dynamics. Marine Isotope Stage 11 occurred from 425 to 394 ka, when global ice volume was the lowest, sea level was the highest, and terrestrial temperatures were the warmest of the last 500 kyr. Because of its extreme character, this interval has been considered an analog for the next century of climate change. The Bering Sea is ideally situated to record how opening or closing of the Pacific–Arctic Ocean gateway (Bering Strait) impacted primary productivity, sea ice, and sediment transport in the past; however, little is known about this region prior to 125 ka. IODP Expedition 323 to the Bering Sea offered the unparalleled opportunity to look in detail at time periods older than had been previously retrieved using gravity and piston cores. Here we present a multi-proxy record for Marine Isotope Stages 12 to 10 from Site U1345, located near the continental shelf-slope break. MIS 11 is bracketed by highly productive laminated intervals that may have been triggered by flooding of the Beringian shelf. Although sea ice is reduced during the early MIS 11 laminations, it remains present at the site throughout both glacials and MIS 11. High summer insolation is associated with higher productivity but colder sea surface temperatures, which implies that productivity was likely driven by increased upwelling. Multiple examples of Pacific–Atlantic teleconnections are presented including laminations deposited at the end of MIS 11 in synchrony with millennial-scale expansions in sea ice in the Bering Sea and stadial events seen in the North Atlantic. When global eustatic sea level was at its peak, a series of anomalous conditions are seen at U1345. We examine whether this is evidence for a reversal of Bering Strait throughflow, an advance of Beringian tidewater glaciers, or a turbidite.

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“…1a), and its properties are dominated by nutrient and meltwater supply from the coastal Alaskan glaciers (Spies, 2007). Further offshore, the Alaska Current (AC) also flows anti-clockwise, controlled in strength by the Alaska Gyre (Kato et al, 2016) (Fig. 1a).…”

mentioning

confidence: 99%

Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures

Sánchez-Montes¹,

McClymont²,

Lloyd³

et al. 2019

Preprint

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Abstract. The initiation and evolution of the Cordilleran Ice Sheet is relatively poorly constrained. International Ocean Discovery Program (IODP) Expedition 341 recovered marine sediments at Site U1417 in the Gulf of Alaska (GOA). Here we present alkenone-derived sea surface temperature (SST) analyses alongside ice rafted debris (IRD), pollen, terrigenous and marine organic matter (OM) inputs to the GOA through the late Pliocene and early Pleistocene. The first IRD contribution from tidewater glaciers in southwest Alaska is recorded at 2.9 Ma, indicating that the Cordilleran ice sheet extent increased in the late Pliocene. A higher occurrence of IRD and higher sedimentation rates in the GOA during the early Pleistocene, at 2.5 Ma, occur in synchrony with SSTs warming on the order of 1 °C relative to the Pliocene. All records show a high degree of variability in the early Pleistocene, indicating highly efficient ocean-climate-ice interactions through warm SST-ocean evaporation-orographic precipitation-ice growth mechanisms. A climatic shift towards ocean circulation in the subarctic Pacific similar to the pattern observed during negative Pacific Decadal Oscillation (PDO) conditions today appears to be a necessary pre-requisite to develop the Cordilleran glaciation and increase moisture supply to the subarctic Pacific. The drop in atmospheric CO2 concentrations since 2.8 Ma is suggested as one of the main forcing mechanisms driving the Cordilleran glaciation.

show abstract

Pliocene and Pleistocene paleoceanography in the western subarctic Pacific based on diatom analyses of ODP Leg 145 Hole 884B and IODP Expedition 323 Holes U1341B and U1343E

Cited by 6 publications

References 31 publications

Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures

Late Pliocene Cordilleran Ice Sheet development with warm northeast Pacific sea surface temperatures

Bering Sea surface water conditions during Marine Isotope Stages 12 to 10 at Navarin Canyon (IODP Site U1345)

Late Pliocene Cordilleran Ice Sheet development with warm Northeast Pacific sea surface temperatures

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