Provenance and supply of Fe-enriched terrigenous sediments in the western equatorial Pacific and their relation to precipitation variations during the late Quaternary

Wu, Jiawang; Liu, Zhifei; Zhou, Chao

doi:10.1016/j.gloplacha.2013.06.002

Cited by 26 publications

(32 citation statements)

References 109 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Variations in precipitation and primary production associated with insolation changes have been documented in the WPWP. Increased terrigenous sediment fluxes that are antiphased with northern hemisphere summer insolation have been observed in sediment cores from near‐shore New Guinea, which were interpreted to be caused by increased precipitation with stronger Australia‐Indonesia Summer Monsoon [ Tachikawa et al ., ; Shiau et al ., ; Wu et al ., ]. Beaufort et al .…”

Section: Discussionmentioning

confidence: 99%

Precessional control on ocean productivity in the Western Pacific Warm Pool for the last 400 kyr: Insight from biogenic magnetite

Yamazaki

Horiuchi

2016

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Abstracts The Western Pacific Warm Pool plays a significant role in large‐scale atmospheric circulation and global hydrology. We conducted an environmental magnetic study of two late Pleistocene sediment cores from the western equatorial Pacific Ocean offshore of New Guinea in order to better constrain climatic and oceanographic variability, particularly spatiotemporal ocean productivity variations. Magnetic property measurements and transmission electron microscopy reveal that the magnetic mineral assemblages in the studied sediments are a mixture of biogenic and terrigenous magnetite. Variations in the acid soluble sediment component, interpreted as carbonate content, and the proportion of biogenic to terrigenous magnetite estimated from the ratio of anhysteretic to saturation remanent magnetizations are in‐phase with northern hemisphere summer insolation variations. We interpret that ocean productivity increased during insolation maxima, which induced higher populations of magnetotactic bacteria through a larger nutrient supply to the seafloor. This interpretation assumes that magnetotactic bacterial populations are greatest in sediments just below the seafloor. Precessional frequencies in magnetic mineral concentration variations are suppressed after correction for carbonate dilution, whereas cyclic changes with a ∼100 kyr periodicity remain in carbonate‐free magnetic concentration variations. Glacial/interglacial changes in bottom water currents may have influenced transportation and deposition of magnetic minerals. We demonstrate the usefulness of magnetic proxies for paleoceanographic studies, particularly of biogenic magnetite proxies for estimating paleoproductivity variations.

show abstract

Section: Discussionmentioning

confidence: 99%

Precessional control on ocean productivity in the Western Pacific Warm Pool for the last 400 kyr: Insight from biogenic magnetite

Yamazaki

Horiuchi

2016

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…Finally, ratios of ultra‐mafic (Cr and Ni) to felsic (Zr) and to mafic (Sc, V, Y) elements [ McLennan et al ., ] demonstrate significant differences between MD10‐3340 and PNG‐derived sediment, with much more enriched ultramafic contributions in MD10‐3340 (Figures d and e). Thus, in contrast to the Halmahera region, the PNG‐derived sediments contain more felsic materials, indicating sources from the intermediate‐basaltic basement rock‐type of PNG which is a marginal cordillera of the Australian continent [ Davies , ; Wu et al ., ].…”

Section: Discussionmentioning

confidence: 99%

“…Previous records of terrigenous input from the southern parts of maritime Southeast Asia commonly have shown in‐phasing linkage to the austral summer (DJF) insolation (Figure e) [ Lückge et al ., ; Kissel et al ., ; Tachikawa et al ., ; Wu et al ., ] (see Figure for core locations). These records generally reflect forcing of the AISM, as they experience the wet season from November to March when the ITCZ lies overhead [e.g., Moron et al ., ].…”

Section: Discussionmentioning

confidence: 99%

“…Previous reports of terrigenous input from the southern hemisphere areas of the IPWP generally show dominant precessional variations in‐phase with austral summer (December to February) insolation change, and have been proposed to be controlled by the AISM [ Lückge et al ., ; Tachikawa et al ., ; Wu et al ., ]. These findings are supported by the stalagmite δ 18 O record from Flores Island [ Griffiths et al ., ] and are consistent with the hemispheric summer insolation forcing hypothesis.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Precessional changes in the western equatorial Pacific Hydroclimate: A 240 kyr marine record from the Halmahera Sea, East Indonesia

Dang

Jian

Kissel

et al. 2015

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Within the precession band, an interhemispheric antiphase pattern in the tropical hydroclimate is supported by many paleorecords, and optimally explained by the forcing of precessional insolation change. However, scenarios within the western equatorial Pacific (WEP), which plays the role of the ascending center of atmospheric convection, remain poorly determined. In this study, a marine sediment core from the Halmahera Sea, East Indonesia, was analyzed with high-resolution XRF scanning, quantitative discrete XRF, and ICP-AES/MS measurements. The terrigenous fractions in this core are constrained by their trace elemental characteristics to be locally sourced from Halmahera Island, and hence reflect variations in the local riverine runoff and precipitation. On this basis, a continuous record of precipitation changes of the western equatorial Pacific was reconstructed with multidecadal resolution over the last 240 ka, using an age model established by the correlation between an adjusted ice volume model and benthic d 18 O constrained by 14 C dating. The records of terrigenous input show a dominant 23 kyr periodicity with a 90 100 phase lag to the boreal summer (i.e., in-phase with the boreal autumn) insolation change. This pattern can be explained by the variability in the convective activity over the WEP, which might be primarily controlled by precessional changes in the El Niño and Southern Oscillation (ENSO) system. A dynamic linkage is implied between the precessional variations in the convective activity in the WEP and the East Asian and Australia-Indonesian summer monsoons (EASM and AISM), in the sense of their distinct stable phase relationship to precession.

show abstract

“…Large amounts of precipitation and abundant terrigenous input make this area an ideal location in which to study global tropical climate. Previous studies in the western tropical Pacific have concentrated on sea surface temperature, salinity, and hydrological variability and, particularly, ocean currents (e.g., Lea et al, 2000;Rosenthal et al, 2003;de Garidel-Thoron et al, 2005;Tachikawa et al, 2011;Wu et al, 2012Wu et al, , 2013Fan et al, 2013;Dang et al, 2015). The South China Sea (SCS) is the largest marginal sea in the western Pacific and has well-preserved hemipelagic sediments, making it the focus of paleoceanographic studies and hydrocarbon exploration in recent decades (Wang and Li, 2009;Wang et al, 1995Wang et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

Differences in Late Quaternary primary productivity between the western tropical Pacific and the South China Sea: Evidence from coccoliths

Liu

Beaufort

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

View full text Add to dashboard Cite

Provenance and supply of Fe-enriched terrigenous sediments in the western equatorial Pacific and their relation to precipitation variations during the late Quaternary

Cited by 26 publications

References 109 publications

Precessional control on ocean productivity in the Western Pacific Warm Pool for the last 400 kyr: Insight from biogenic magnetite

Precessional control on ocean productivity in the Western Pacific Warm Pool for the last 400 kyr: Insight from biogenic magnetite

Precessional changes in the western equatorial Pacific Hydroclimate: A 240 kyr marine record from the Halmahera Sea, East Indonesia

Differences in Late Quaternary primary productivity between the western tropical Pacific and the South China Sea: Evidence from coccoliths

Contact Info

Product

Resources

About