Enhanced silicate weathering of tropical shelf sediments exposed during glacial lowstands: A sink for atmospheric CO2

Wan, Shiming; Clift, Peter D.; Zhao, Debo; Hovius, Niels; Munhoven, Guy; France‐Lanord, Christian; Wang, Yinxi; Xiong, Zhifang; Huang, Jie; Yu, Zhaojie; Zhang, Jin; Ma, Wentao; Zhang, Guoliang; Li, Anchun; Li, Tiegang

doi:10.1016/j.gca.2016.12.010

Cited by 102 publications

(102 citation statements)

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“…The concentrations of authigenic Mn and Ni vary similarly, showing the highest values during the Holocene (Figures e and S3e). The Mn/Ti during the Holocene (3.12 on average) is remarkably higher than the ratio of terrigenous sediments in the southwest SCS (0.12 at NS90‐103, Wei et al, , and 0.22 at the ODP site 1143, Wan et al, ). The Mn auth is five times higher during the Holocene compared to the last glaciation.…”

Section: Resultsmentioning

confidence: 96%

“…The most U‐enriched sediment was dated between 22 and 17.5 ka. Moreover, the bulk U/Ti of the LGM sediments at B9 (11.2 × 10 −4 on average) is higher than that of terrigenous sediments (5.0–6.0 × 10 −4 ) at NS90‐103 (Wei et al, ) and the ODP site 1143 (Wan et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…wuellerstorfi , (c) TiO 2 , (d) biogenic Ba, (e) authigenic Mn, (f) authigenic U, and (g) U/Th. The U/Th range of terrigenous sediment from the ODP site 1143 (Wan et al, ) is marked by a red bar on the y ‐axis (g). The Last Glacial Maximum (LGM) and the deglacial period, including the Heinrich Stadial 1 (HS1), Younger Dryas (YD), and Bølling/Allerød Interstadial (B/A) are highlighted by gray vertical bars and dashed lines.…”

Section: Resultsmentioning

confidence: 99%

“…The influence of sediment provenance variations cannot be completely excluded. However, the changes in redox proxies (Mn/Ti, U/Ti, U/Th, and V/Cr) from the LGM to the Holocene at B9 are strikingly larger than the glacial/interglacial variations in these ratios of terrigenous sediments in southern SCS (Wan et al, ; Wei et al, ), suggesting that the oscillation of redox conditions plays a dominant role. In summary, redox‐sensitive elemental data of core B9 suggest that the change in oxygenation features of sea bottom sediments at 2,603 m in southern SCS started at 18 ka and the oxygenation has been set to the modern condition since the YD.…”

Section: Discussionmentioning

confidence: 99%

“…Authigenic or biogenic concentrations of the elements barium (Ba), phosphorus (P), manganese (Mn), nickel (Ni), chromium (Cr), vanadium (V), and uranium (U) at site B9 are estimated by subtracting the terrigenous contribution from bulk‐sediment elemental concentrations by using the formula . Average elemental concentrations of detrital components of core NS90‐103 (Wei et al, ) and the Ocean Drilling Program (ODP) site 1143 (Wan et al, ) (Figure a) are taken to represent the composition of terrigenous sediments in this study area.

M_{auth} or M_{bio} = M_{bulk} - {Ti}_{bulk} \times M_{detr} / {Ti}_{detr}

where M auth and M bio are the elemental concentrations of authigenic or biogenic components, M bulk is the elemental concentration of bulk sediments, and M detr /Ti detr is the element ratio relative to Ti of terrigenous sediments assessed from core NS90‐103 (Wei et al, ) and the ODP site 1143 (Wan et al, ).…”

Section: Methodsmentioning

confidence: 99%

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Changes in Deep Water Oxygenation of the South China Sea Since the Last Glacial Period

Chen

Rashid

Zhong

et al. 2018

Geophysical Research Letters

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The Pacific meridional overturning circulation is thought to have a significant influence on global climate. However, the extent to which intermediate and deep circulations have changed in the Pacific Ocean since the Last Glacial Maximum (LGM) is not well known. At present, the South China Sea Deep Water (SCSDW) is fed by the upper Pacific Deep Water. Here we present new benthic foraminiferal δ13C and redox‐sensitive elemental data from a sediment core retrieved from the southern deep SCS to reconstruct the oxygenation history of the SCSDW since the LGM. Oxygenation records from the deep SCS and intermediate and deep waters in the Pacific Ocean demonstrate that the SCSDW deeper than 1,600 m has been sourced by the Pacific Deep Water since the LGM. Our data suggest that the well‐ventilated North Pacific Intermediate Water would not have influenced the SCSDW during cold stadials of the last deglacial period.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%