Sensitivity of Sediment Magnetic Records to Climate Change during Holocene for the Northern South China Sea

Ouyang, Tingping; Li, Mingkun; Zhao, Xiang; Zhu, Zhaojie; Tian, Chong‐Bin; Qi, Yan; Peng, Xuechao; Hu, Qiao

doi:10.3389/feart.2016.00054

Cited by 13 publications

(12 citation statements)

References 52 publications

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“…To translate into SST (without considering the SSS changes), the temperature was estimated to be roughly 0.84°C higher than present. This agrees with other lines of evidence that suggested a higher temperature during that period (Ouyang et al, 2016), which was considered to be a Holocene Megathermal in China (8.5…”

Section: Reconstructed Climate With Fossil Tridacna A5 δ 18 O Evidencesupporting

confidence: 92%

“…Shi (1994) reviewed the data from various sources (like ice core, inland lakes, paleosols in loess and eolian sands, sea level fluctuations, palynological and botanical studies) in China, indicating the early Maghalayan was involved in Holocene Megathermal period (8 to 3 ka BP). Sediments in the South China Sea also implied the temperature may have been relatively higher in the early of Meghalayan than present (Ouyang et al, 2016). However, those studies are low-resolution, the high-resolution records under interannual climate variation are rare.…”

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confidence: 99%

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Evidence of intense climate variation and reduced ENSO activity from δ18O of Tridacna 3700 years ago

Sun

Cheng

et al. 2019

Preprint

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Abstract. Tridacna is the largest marine bivalves in the tropical ocean, and its carbonate shell can shed light on high-resolution paleoclimate reconstruction. In this contribution, δ18Oshell was used to estimate the climatic variation in the Xisha Islands of the South China Sea. We first evaluate the sea surface temperature (SST) and sea surface salinity (SSS) influence on modern rehandled monthly (r-monthly) resolution Tridacna gigas δ18Oshell. The obtained results reveal that δ18Oshell seasonal variation is mainly controlled by SST and appear insensitive to local SSS change. Thus, the δ18O of Tridacna shells can be roughly used as a proxy of the local SST: a 1 ‰ δ18Oshell change is roughly equal to 4.41 °C of SST. R-monthly δ18O of a 40-year Tridacna squamosa (3673 ± 28 BP) from the North Reef of Xisha Islands was analyzed and compared with the modern specimen. The difference between the average δ18O of fossil Tridacna shell (δ18O = −1.34 ‰) and modern Tridacna specimen (δ18O = −1.15 ‰) probably implies a warm climate with roughly 0.84°C higher in 3700 years ago. The seasonal variation in 3700 years ago was slightly decreased compared with that suggested by the instrument data, and the switching between warm and cold-seasons was rapid. Higher amplitude in r-monthly and r-annual reconstructed SST anomalies implies an enhanced climate variability in this past warm period. Investigation of the El Ninõ-Southern Oscillation (ENSO) variation (based on the reconstructed SST series) indicates a reduced ENSO frequency but more extreme El Ninõ events in 3700 years ago.

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Section: Reconstructed Climate With Fossil Tridacna A5 δ 18 O Evidencesupporting

confidence: 92%

mentioning

confidence: 99%

Evidence of intense climate variation and reduced ENSO activity from δ18O of Tridacna 3700 years ago

Sun

Cheng

et al. 2019

Preprint

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“…Measurements of trace elements were made using a PerkinElmer Elan9000 element inductively coupled plasma mass spectrometry (ICP-MS) at the ALS Chemex Lab, Ltd (Guangzhou, China). Ground samples were prepared using a four-acid (HF, HNO 3 , HClO 4 , HCl) digestion method 116 . Analytical precision for all elements is better than 7%, and accuracy was evaluated relative to international reference materials, including GBM398-4c, GBM908-10, MRGeo08 and OGGeo08.…”

Section: Methodsmentioning

confidence: 99%

Geochemical Evidence of First Forestation in the Southernmost Euramerica from Upper Devonian (Famennian) Black Shales

Ikejiri

et al. 2019

Sci Rep

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The global dispersal of forests and soils has been proposed as a cause for the Late Devonian mass extinctions of marine organisms, but detailed spatiotemporal records of forests and soils at that time remain lacking. We present data from microscopic and geochemical analyses of the Upper Devonian Chattanooga Shale (Famennian Stage). Plant residues (microfossils, vitrinite and inertinite) and biomarkers derived from terrestrial plants and wildfire occur throughout the stratigraphic section, suggesting widespread forest in the southern Appalachian Basin, a region with no macro plant fossil record during the Famennian. Inorganic geochemical results, as shown by increasing values of SiO 2 /Al 2 O 3 , Ti/Al, Zr/Al, and the Chemical Index of Alteration (CIA) upon time sequence, suggest enhanced continental weathering that may be attributed to the invasion of barren lands by rooted land plants. Our geochemical data collectively provide the oldest evidence of the influences of land plants from the southernmost Appalachian Basin. Our synthesis of vascular plant fossil record shows a more rapid process of afforestation and pedogenesis across south-central Euramerica during the Frasnian and Famennian than previously documented. Together, these results lead us to propose a new hypothesis that global floral dispersal had progressed southward along the Acadian landmass rapidly during the Late Devonian.

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“…Magnetic properties of marine sedimentary sequences, although still very scarce, have recently increasingly been analyzed in the SCS with a focus on the northernmost basin. The results show, with variable time resolution, a variability in nature, grain‐size, and concentration of magnetic particles, interpreted as a result of the local impact of past changes in East Asian monsoon, sea level, and ocean circulation (Q. Chen et al, ; Kissel et al, ; Ouyang et al, , ; Solheid et al, ; Zheng et al, ).…”

Section: Introductionmentioning

confidence: 97%

“…The results show, with variable time resolution, a variability in nature, grain-size, and concentration of magnetic particles, interpreted as a result of the local impact of past changes in East Asian monsoon, sea level, and ocean circulation (Q. Chen et al, 2017;Kissel et al, 2003;Ouyang et al, 2014Ouyang et al, , 2016Solheid et al, 2003;Zheng et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fingerprints of Modern Sediments in the South China Sea Resulting From Source‐to‐Sink Processes

Kissel

Sarnthein²,

Làj

et al. 2018

Geochem Geophys Geosyst

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More than 650 Mt/year of fluvial sediment are delivered from continental regions into the South China Sea (SCS). Previous studies have shown that the composition of the magnetic fraction of riverine sediments drained into the SCS is significantly variable from north to south. On the basis of this evidence, we now examine a full set of magnetic properties for a number of core tops taken at water depth of mostly between 800 and 3,500 m. Room temperature magnetic parameters and thermal spectra are used to obtain information about the concentration and mineralogical magnetic composition. Spatial changes are observed in the relative proportion of magnetite and hematite with an increase of the latter toward the south, similarly to the observation on land. However, the N‐S contrast is much weaker in marine core tops than in river sediments, because of the role played by the shelf in partly trapping river‐borne sediments, in particular in the southern SCS. In part, sediments also reach the continental slope and the deep basins, being transported and mixed by surface and deepwater currents, which yield the magnetite‐hematite mixing in the south. For the first time, we characterize a wide spectrum of magnetic properties of modern marine sediment in the SCS. Our results give important insights into the modern pathways of sediment particles, depicting the source‐to‐sink processes that affect the terrigenous sediment load.

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Sensitivity of Sediment Magnetic Records to Climate Change during Holocene for the Northern South China Sea

Cited by 13 publications

References 52 publications

Evidence of intense climate variation and reduced ENSO activity from δ<sup>18</sup>O of <i>Tridacna</i> 3700 years ago

Evidence of intense climate variation and reduced ENSO activity from δ<sup>18</sup>O of <i>Tridacna</i> 3700 years ago

Geochemical Evidence of First Forestation in the Southernmost Euramerica from Upper Devonian (Famennian) Black Shales

Magnetic Fingerprints of Modern Sediments in the South China Sea Resulting From Source‐to‐Sink Processes

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Sensitivity of Sediment Magnetic Records to Climate Change during Holocene for the Northern South China Sea

Cited by 13 publications

References 52 publications

Evidence of intense climate variation and reduced ENSO activity from δ&lt;sup&gt;18&lt;/sup&gt;O of &lt;i&gt;Tridacna&lt;/i&gt; 3700 years ago

Evidence of intense climate variation and reduced ENSO activity from δ&lt;sup&gt;18&lt;/sup&gt;O of &lt;i&gt;Tridacna&lt;/i&gt; 3700 years ago

Geochemical Evidence of First Forestation in the Southernmost Euramerica from Upper Devonian (Famennian) Black Shales

Magnetic Fingerprints of Modern Sediments in the South China Sea Resulting From Source‐to‐Sink Processes

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Evidence of intense climate variation and reduced ENSO activity from δ<sup>18</sup>O of <i>Tridacna</i> 3700 years ago

Evidence of intense climate variation and reduced ENSO activity from δ<sup>18</sup>O of <i>Tridacna</i> 3700 years ago