Changes in detrital input, ventilation and productivity in the central Okhotsk Sea during the marine isotope stage 5e, penultimate interglacial period

Jiménez‐Espejo, Francisco J.; García‐Alix, Antonio; Harada, Naomi; Bahr, André; Sakai, Saburo; Iijima, Koichi; Chang, Qing; Satô, Keiko; Suzuki, Katsuhiko; Ohkouchi, Naohiko

doi:10.1016/j.jseaes.2018.01.032

Cited by 6 publications

(9 citation statements)

References 108 publications

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“…High biogenic productivity and fine sediments with a low IRD content and MS were formed in the interglacial intervals (Gorbarenko et al, 2002(Gorbarenko et al, , 2012. The proportion of terrigenous sediments from the Siberian continent increased compared to the glacial intervals (Nürnberg et al, 2011;Iwasaki et al, 2012;Khim et al, 2012;Jimenez-Espejo et al, 2018). The proportion of ferromagnetic grains among the fine grained material is, yet, relatively lower.…”

Section: Paleoenvironment In the Central Okhotsk Sea During Stronger-interglacial/ Interglacial Intervalsmentioning

confidence: 99%

“…Previous studies reported contemporaneous (i.e., <500 ka) environmental changes during interglacial intervals such as decreasing of IRD (e.g., Nürnberg and Tiedemann, 2004;Gorbarenko et al, 2017) and the increasing of sea level (e.g., Thomas et al, 2009). The latter strongly modified the input of terrigenous sediments in the center of Okhotsk Sea (e.g., Liu et al, 2006;Nürnberg et al, 2011;Jimenez-Espejo et al, 2018). Nürnberg and Tiedemann (2004) pointed out a significant gradual decline of the IRD fraction and an increase of the <63 μm fraction from ∼400 to 600 ka within a sediment record in the central Okhotsk Sea.…”

Section: Paleoenvironment In the Central Okhotsk Sea During Stronger-interglacial/ Interglacial Intervalsmentioning

confidence: 99%

“…The microbial decay reactions therefore led to the exhaustion of dissolved oxygen in bottom water (Wakeham, 2020). The lesser sea ice formation (Figure 3G) also weaken the seawater ventilation, leading to a decrease of the oxygen supply into deep water in the center of Okhotsk Sea (Zou et al, 2015;Lembke-Jene et al, 2017Jimenez-Espejo et al, 2018). Both processes may cause the pore water gradient in the sediments changing from suboxic to anoxic condition.…”

Section: Paleoenvironment In the Central Okhotsk Sea During Stronger-interglacial/ Interglacial Intervalsmentioning

confidence: 99%

“…It can thus provide crucial information about the glacial-interglacial climate change linked to the interaction between continent and ocean. The environmental proxies of the sediments accumulated in Okhotsk Sea are sensitive to past climate change, reflecting in the erosion of source regions, sea ice coverage, and changes in sea level and land-sea interactions (Gorbarenko et al, 2002(Gorbarenko et al, , 2010(Gorbarenko et al, , 2012Nürnberg and Tiedemann, 2004;Sakamoto et al, 2005Sakamoto et al, , 2006Liu et al, 2006;Chou et al, 2011;Nürnberg et al, 2011;Seki et al, 2012;Yamazaki et al, 2013;Zou et al, 2015;Jimenez-Espejo et al, 2018;Lo et al, 2018;Lattaud et al, 2019). Some previous work already used the magnetic parameters and environmental data to reconstruct the sea ice condition and climate changes (e.g., Gorbarenko et al, 2002;Chou et al, 2011;Yamazaki et al, 2013); such type of studies remains, however, rare.…”

Section: Introductionmentioning

confidence: 99%

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Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka

Chou

Jiang

et al. 2021

Front. Earth Sci.

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The Okhotsk Sea, which connects the high latitude Asian continent and the North Pacific, plays an important role in modern and past climate changes due to seasonal sea ice coverage and as a precursor of the North Pacific Intermediate Water. The long-term glacial-interglacial changes of sea ice coverage and its impacts on terrigenous transport and surface primary productivity in the Okhotsk Sea remain, however, not well constrained. Base on the paleomagnetic, rock magnetic, micropaleontological (diatom), and geochemical studies of the marine sediment core MD01-2414 (53°11.77′N, 149°34.80′E, water depth: 1,123 m) taken in the central Okhotsk Sea, we reconstruct the terrigenous sediment transport and paleoceanographic variations during the past 1550 thousand years (kyr). Seventeen geomagnetic excursions are identified from the paleomagnetic directional record. Close to the bottom of the core, an excursion was observed, which is proposed to be the Gilsa event ∼1550 thousand years ago (ka). During glacial intervals, our records reveal a wide extension of sea ice coverage and low marine productivity. We observed ice-rafted debris from mountain icebergs composed of coarse and high magnetic terrigenous detritus which were derived from the Kamchatka Peninsula to the central Okhotsk basin. Still during glacial intervals, the initiation (i.e., at ∼900 ka) of the Mid-Pleistocene Transition marks the changes to even lower marine productivity, suggesting that sea-ice coverage became larger during the last 900 ka. During interglacial intervals, the central Okhotsk Sea was either devoid of sea-ice or the ice was at best seasonal; resulting in high marine productivity. The weaker formation of Okhotsk Sea Intermediate Water, lower ventilation, and microbial degradation of organic matter depleted the oxygen concentration in the bottom water and created a reduced environment condition in the sea basin. The freshwater supplied by snow or glacier melting from Siberia and Kamchatka delivered fine grain sediments to the Okhotsk Sea. During the stronger interglacial intervals after the Mid-Brunhes Transition (i.e., Marine Isotope Stages 1, 5e, 9, and 11), strong freshwater discharges from Amur River drainage area are in association with intensified East Asian Summer Monsoon. This process may have enhanced the input of fine-grained terrigenous sediments to the central Okhotsk Sea.

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Section: Paleoenvironment In the Central Okhotsk Sea During Stronger-interglacial/ Interglacial Intervalsmentioning

confidence: 99%

Section: Paleoenvironment In the Central Okhotsk Sea During Stronger-interglacial/ Interglacial Intervalsmentioning

confidence: 99%

Section: Paleoenvironment In the Central Okhotsk Sea During Stronger-interglacial/ Interglacial Intervalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka

Chou

Jiang

et al. 2021

Front. Earth Sci.

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“…). Nevertheless, use of Si as a productivity proxy should be applied with caution, because Si can also be controlled by siliciclastic material during low-productivity periods, even in polar regions 74 , and light elements, such as Si or Al, have low detectability by XRF scanner measurements when present in low concentrations 75 .…”

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confidence: 99%

Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice

et al. 2021

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A ntarctica's marine margin is a complex biological and oceanographic system in which sea-ice growth, Antarctic Bottom Water (AABW) formation and high primary productivity act as a significant CO 2 sink and ventilate the Southern Ocean 1,2 . High primary productivity occurs where nutrients are brought to the surface, including oceanographic fronts 3 , polynyas 4 , upwelling near the continental shelf break 5 and the marginal ice zone (MIZ) 6 , all of which are influenced by Antarctic wind fields. High productivity and export events around Antarctica occur with changing insolation and stratification associated with sea-ice break-up 7 . Large-scale subdecadal climate modes, specifically the El Niño-Southern Oscillation (ENSO), Southern Annular Mode (SAM) and Indian Ocean Dipole (IOD), are known to affect sea ice 8,9 and wind fields 10 around Antarctica. The teleconnection between ENSO (which varies at 2-7 year periods) and Antarctic sea-ice variability is largely driven by wind changes resulting from hemispheric-scale sea level pressure and 500 mbar height anomalies 8 . This teleconnection can be amplified or dampened by other subdecadal climate modes such as the IOD and SAM 9-12 . Collectively, these subdecadal climate modes alter meridional and zonal wind flows 9,10 that regulate sea-ice break-out 11 at 2-7 year periods, thus influencing primary productivity in Antarctica [13][14][15] . Clarifying how the annual cycle and subdecadal-scale climate modes have impacted past Antarctic coastal systems will inform models used to project future system response 16 .We investigate a 170 m sediment core recovered from the Adélie Basin (Integrated Ocean Drilling Program (IODP) Site U1357B) 17 along the Wilkes Land margin of East Antarctica (Fig. 1). The Adélie Basin is a region of high primary productivity near the MIZ. It also lies beneath and downstream of several large polynya systems and the westward-flowing Antarctic Coastal Current. The drill site targeted a high-sedimentation (~1.5-2 cm per year) drift deposit (Adélie Drift) dominated by pelagic biogenic deposition. It provides an ultra-high-resolution Holocene record of climate and oceanographic variability adjacent to the Mertz Polynya system, one of the largest exporters of sea ice and AABW along the East Antarctic margin 2 . Previously collected Antarctic cores have significantly lower sedimentation rates, and alternate between massive (bioturbated) and laminated diatom ooze 18,19 . They cannot resolve high-frequency change at subdecadal scales. However, U1357B is continuously laminated, and high sedimentation rates afford an unprecedented opportunity to assess subdecadal and annual changes at the Antarctic oceanic margin. An ultra-high-resolution record of marine biogenic bloomsThe east-west elongated Adélie Drift deposit formed parallel to the wind-driven Antarctic Coastal Current 2,20 . This current influences both surface and deep waters on the continental shelf 2,20 . Consequently, the mass accumulation rate (MAR) (Methods) in this drift is thought to reflec...

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Climates and sea-level controls on chemical weathering in the northern shelf of the Okhotsk Sea in the past 23 ka

Jiang,

Wang,

Yao

et al. 2024

Journal of Asian Earth Sciences

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Changes in detrital input, ventilation and productivity in the central Okhotsk Sea during the marine isotope stage 5e, penultimate interglacial period

Cited by 6 publications

References 108 publications

Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka

Controls on Terrigenous Detritus Deposition and Oceanography Changes in the Central Okhotsk Sea Over the Past 1550 ka

Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice

Climates and sea-level controls on chemical weathering in the northern shelf of the Okhotsk Sea in the past 23 ka

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