Biogenic opal indicating less productive northwestern North Pacific during the glacial ages

Narita, Hisashi; Satō, Masayasu; Tsunogai, Shizuo; Murayama, Masafumi; Ikehara, Masaaki; Nakatsuka, Takeshi; Wakatsuchi, Masaaki; Harada, Naomi; Ujiié, Yukika

doi:10.1029/2001gl014320

Cited by 74 publications

(47 citation statements)

References 22 publications

(26 reference statements)

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“…Higher opal content during the deglaciation than in the other periods after LGM in the NW Pacific and its marginal seas was reported . The period of high opal content indicated by Narita et al (2002) was the same as those of high water content horizons in our results. Thus, high water content might relate to diatom productivity in surface water.…”

Section: Core Correlation and Temporal Change Of Sediment Lithology Asupporting

confidence: 70%

“…Harada et al (2004) indicated the change of surface circulation in the North Pacific between LGM and Holocene. Narita et al (2002) reported lower biogenic opal production, indicating less atmospheric carbon fixation, during LGM. Therefore, paleoceanographic studies in the source region of the NPIW are very important to understand modern and ancient carbon cycling in the global ocean.…”

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Change of bottom water conditions at intermediate depths of the Oyashio region, NW Pacific over the past 20,000 yrs

Ikehara

Ohkushi

Shibahara

et al. 2006

Global and Planetary Change

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Section: Core Correlation and Temporal Change Of Sediment Lithology Asupporting

confidence: 70%

Section: Introductionmentioning

confidence: 95%

Change of bottom water conditions at intermediate depths of the Oyashio region, NW Pacific over the past 20,000 yrs

Ikehara

Ohkushi

Shibahara

et al. 2006

Global and Planetary Change

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“…1) Cook et al 2005;Gorbarenko et al 2005Gorbarenko et al , 2010Okazaki et al 2005;Tanaka and Takahashi 2005;Brunelle et al 2007;Itaki et al 2009;Caissie et al 2010). Narita et al (2002) also revealed a remarkable reduction in opal production due to the southward advancement of sea-ice cover in the northwestern Pacific during the last glacial period. By contrast, paleoproductivity was enhanced during the last deglaciation, showing distinct peak events of opal and carbonate production in the Bering Sea (Cook et al 2005;Gorbarenko et al 2005Gorbarenko et al , 2010Okazaki et al 2005;Brunelle et al 2007;Itaki et al 2009;Caissie et al 2010).…”

Section: Discussionmentioning

confidence: 87%

High organic carbon deposition in the northern margin of the Aleutian Basin (Bering Sea) before the last deglaciation

et al. 2010

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High-resolution geochemical, isotope and elemental data from core PC23A in the northern margin of the Aleutian Basin (Bering Sea) were used to reconstruct distinct paleoceanographic features of the last deglaciation (pre-Boreal[PB], Bølling-Allerød[BA], Younger Dryas[YD]). The PB and BA intervals are characterized by increased siliceous (diatom) and calcareous (coccolithophores and foraminifers) productivity represented by high biogenic opal and CaCO 3 contents, respectively. The enhanced productivity can plausibly be attributed to an elevated sea-surface nutrient supply from increased melt-water input and enhanced Alaskan Stream injection under warm, restricted sea-ice conditions. High C org /N ratios and low δ 13 C values of sediment organic matter during the PB and BA intervals reflect the contribution of terrestrial organic matters. The PB and BA intervals were also identified by laminated sediment layers of core PC23A, characterized by high Mo/Al and Cd/Al ratios, indicating that the bottom water condition remained anoxic. High δ 15 N values during the same period were attributed mainly to the increased nutrient utilization and subsequent denitrification of seawater nitrate. Part of high δ 15 N values may also be due to incorporation of inorganic nitrogen in the clay minerals. It is worthy of note that high total organic carbon (TOC) deposition occurred approximately 3,000 years before onset of the last deglaciation. Simultaneous high C org /N ratios and low δ 13 C values clearly suggest that the high TOC content should be related to terrestrial organic carbon input. Low δ 15 N values during the high TOC interval also confirm the contribution of terrigenous organic matter. Although abundant calcareous phytoplankton production under cold, nutrient-poor conditions represented by Ba ex data was reported for high TOC deposition preceding the last deglaciation in an earlier study of the Okhotsk Sea, the main reason for the enhanced TOC deposition in the Bering Sea is an increased terrigenous input from the submerged continental shelves (Beringia) with a sea-level rise; this is further supported by Al enrichment of bulk sediments during the high TOC deposition.

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“…Major reorganization of ocean circulation in the North Pacific during the glacial-deglacial period affected productivity through upwelling. During the last glacial maximum, primary productivity in the subarctic Pacific was low because of stratification (Narita et al, 2002;Jaccard et al, 2005;Galbraith et al, 2007;Brunelle et al, 2010). Thick GNPIW with low nutrient concentrations down to ∼2000 m suppressed biological productivity in the euphotic layer.…”

Section: Implications For the Release Of Old Carbon From The Deep Seamentioning

confidence: 99%

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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Biogenic opal indicating less productive northwestern North Pacific during the glacial ages

Cited by 74 publications

References 22 publications

Change of bottom water conditions at intermediate depths of the Oyashio region, NW Pacific over the past 20,000 yrs

Change of bottom water conditions at intermediate depths of the Oyashio region, NW Pacific over the past 20,000 yrs

High organic carbon deposition in the northern margin of the Aleutian Basin (Bering Sea) before the last deglaciation

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

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