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  • 1
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    Monsoon hydrography and productivity changes in the East China Sea during the past 100,000 years : Okinawa Trough evidence (MD012404) (2010)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 24 (2009): PA3208, doi:10.1029/2007PA001577.
    Description: We analyzed the high-resolution foraminifer isotope records, total organic carbon (TOC), and opal content from an Okinawa Trough core MD012404 in order to estimate the monsoon hydrography and productivity changes in the East China Sea (ECS) of the tropical western Pacific over the past 100,000 years. The variability shown in the records on orbital time scales indicates that high TOC intervals coincide with the increases of boreal May–September insolation driven by precession cycles (∼21 ka), implying a strong connection to the variations in monsoons. We also observed possibly nearly synchronous, millennial-scale changes of the ECS surface hydrography (mainly driven by salinity changes but also by temperature effects) and productivity coincident with monsoon events in the Hulu/Dongge stalagmite isotope records. We found that increased freshening and high productivity correlate with high monsoon intensity in interstadials. This study suggests that the millennial-scale changes in monsoon hydrography and productivity in the ECS are remarkable and persistent features over the past 100,000 years.
    Description: Y.Y.’s work was partly supported by Global Environmental Research Fund (RF-081) and JSPS Kakenhi (21674003).
    Keywords: Monsoon ; Productivity ; Precipitation ; Precession ; Okinawa Trough ; East China Sea
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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    PAPER (OA)
  • 2
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    Pollen and spores record, and paleotemperature reconstructions for mid-Holocene sediments of the Northwest Pacific (2009)
    PANGAEA
    In:  Supplement to: Kawahata, Hodaka; Yamamoto, Hisashi; Ohkushi, Ken´ichi; Yokoyama, Yusuke; Kimoto, Katsunori; Ohshima, Hideki; Matsuzaki, Hiroyuki (2009): Changes of environments and human activity at the Sannai-Maruyama ruins in Japan during the mid-Holocene Hypsithermal climatic interval. Quaternary Science Reviews, 28(9-10), 964-974, https://doi.org/10.1016/j.quascirev.2008.12.009
    Details
    Publication Date: 2024-01-25
    Description: Sannai-Maruyama is one of the most famous and best-researched mid-Holocene (mid-Jomon) archaeological sites in Japan, because of a large community of people for a long period. Archaeological studies have shown that the Jomon people inhabited the Sannai-Maruyama site from 5.9–4.2 +/- 0.1 cal. kyr B.P. However, a continuous record of the terrestrial and marine environments around the site has not been available. Core KT05-7 PC-02, was recovered from Mutsu Bay, only 20 km from the site, for the reconstruction of high-resolution time series of environmental records, including sea surface temperature (SST). C37 alkenone SSTs showed clear fluctuations, with four periods of high (8.4-7.9, 7.0-5.9, 5.1-4.1, and 2.3-1.4 cal. kyr B.P.) and four of low (-8.4, 7.9-7.0, 5.9-5.1, and 4.1-2.3 cal. kyr B.P.) SST. Thus, each SST cycle lasted 1.0-2.0 kyr, and the amplitude of fluctuation was about 1.5-2.0 °C. Total organic carbon (TOC) and C37 alkenone contents, and the TOC/total nitrogen ratio indicate that marine biogenic production was low before 7.0 cal. kyr B.P., but was clearly increased between 5.9 and 4.0 cal. kyr B.P., because of stronger vertical mixing. During the period when the community at the site prospered (between 5.9 and 4.2 +/- 0.1 cal. kyr B.P.), the terrestrial climate was relatively warm. The high relative abundance of pollen of both Castanea and Quercus subgen. Cyclobalanopsis supports the interpretation that the local climate was optimal for human habitation. Between 5.9 and 5.1 cal. kyr B.P., in spite of warm terrestrial climates, the C37 alkenone SST was low; this apparent discrepancy may be attributed to the water column structure in the Tsugaru Strait, which differed from the modern condition. The evidence suggests that at about 5.9 cal. kyr B.P, high productivity of marine resources such as fish and shellfish and a warm terrestrial climate led to the establishment of a human community at the Sannai-Maruyama site. Then, at about 4.1 +/- 0.1 cal. kyr B.P., abrupt marine and terrestrial cooling, indicated by a decrease of about 2 °C in the C37 alkenone SST and an increase in pollen of taxa of cooler climates, led to a reduced terrestrial food supply, causing the people to abandon the site. The timing of the abandonment is consistent with the timing (around 4.0–4.3 cal. kyr B.P.) of the decline of civilizations in north Mesopotamia and along the Yangtze River. These findings suggest that a temperature rise of ~2 °C in this century as a result of global warming could have a great impact on the human community and especially on agriculture, despite the advances of contemporary society.
    Keywords: KT05-7; KT05-7_PC-02; PC; PC-02; Piston corer; Tansei Maru; West Pacific Ocean
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 3
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    Age analysis, aragonite and high magnesium calcite content from different IODP Holes from Exp 310 (2011)
    PANGAEA
    In:  Supplement to: Seard, Claire; Camoin, Gilbert; Yokoyama, Yusuke; Matsuzaki, Hiroyuki; Durand, Nicolas; Bard, Edouard; Sépulcre, Sophie; Deschamps, Pierre (2011): Microbialite development patterns in the last deglacial reefs from Tahiti (French Polynesia; IODP Expedition #310): Implications on reef framework architecture. Marine Geology, 279(1-4), 63-86, https://doi.org/10.1016/j.margeo.2010.10.013
    Details
    Publication Date: 2024-01-25
    Description: The widespread occurrence of microbialites in the last deglacial reef frameworks (16-6 Ka BP) implies that the accurate study of their development patterns is of prime importance to unravel the evolution of reef architecture through time and to reconstruct the reef response to sea-level variations and environmental changes. The present study is based on the sedimentological and chronological analysis (14C AMS dating) of drill cores obtained during the IODP Expedition #310 "Tahiti Sea Level" on the successive terraces which typify the modern reef slopes from Tahiti. It provides a comprehensive data base to investigate the microbialite growth patterns (i.e. growth rates and habitats), to analyze their roles in reef frameworks and to reconstruct the evolution of the reef framework architecture during sea-level rise. The last deglacial reefs from Tahiti are composed of two distinctive biological communities: (1) the coralgal communities including seven assemblages characterized by various growth forms (branching, robust branching, massive, tabular and encrusting) that form the initial frameworks and (2) the microbial communities developed in the primary cavities of those frameworks, a few meters (1.5 to 6 m) below the living coral reef surface, where they heavily encrusted the coralgal assemblages to form microbialite crusts. The dating results demonstrate the occurrence of two distinctive generations of microbialites: the "reefal microbialites" which developed a few hundred years after coralgal communities in shallow-water environments, whereas the "slope microbialites" grew a few thousands of years later in significantly deeper water conditions after the demise of coralgal communities. The development of microbialites was controlled by the volume and the shape of the primary cavities of the initial reef frameworks determined by the morphology and the packing of coral colonies. The most widespread microbialite development occurred in frameworks dominated by branching, thin encrusting, tabular and robust branching coral colonies which built loose and open frameworks typified by a high porosity (〉 50%). In contrast, their growth was minimal in compact coral frameworks formed by massive and thick encrusting corals where primary cavities yielded a low porosity (~ 30%) and could not host a significant microbialite expansion.
    Keywords: 310-M0007A; 310-M0007B; 310-M0015B; 310-M0016A; 310-M0016B; 310-M0017A; 310-M0018A; 310-M0023A; 310-M0023B; 310-M0024A; 310-M0025A; 310-M0025B; DP Hunter; DRILL; Drilling/drill rig; Exp310; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Papeete_P10; Papeete_P6-1; Papeete_P6-2; Papeete_P6-3; Papeete_P6-4; Papeete_P7; Papeete_P8; Papeete_P9; TAH-02A-4F; TAH-02A-4G; TAH-02A-5F; TAH-02A-5G; TAH-02A-5H; TAH-03A-1A; TAH-03A-1B; TAH-03A-1C; TAH-03A-1D; TAH-03A-1E; TAH-03A-3; TAH-03A-3A; Tahiti, French Polynesia; Tahiti, offshore Maraa; Tahiti, offshore Tiarei; Tahiti Sea Level
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 4
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    (Table 1) Trace element and age analysis from the Porites coral from IODP Exp 310 (2010)
    PANGAEA
    In:  Supplement to: Inoue, Mayuri; Yokoyama, Yusuke; Harada, Mariko; Suzuki, Atsushi; Kawahata, Hodaka; Matsuzaki, Hiroyuki; Iryu, Yasufumi (2010): Trace element variations in fossil corals from Tahiti collected by IODP Expedition 310: Reconstruction of marine environments during the last deglaciation (15 to 9 ka). Marine Geology, 271(3-4), 303-306, https://doi.org/10.1016/j.margeo.2010.02.016
    Details
    Publication Date: 2024-01-25
    Description: Climate responses and changes in marine environments during the last deglaciation have been controversial and few paleoceanographic data are available from the tropical South Pacific, though this region is crucial in the investigations of ocean-atmosphere interactions. Integrated Ocean Drilling Program Expedition 310 was conducted to establish the time course of the postglacial sea-level rise at Tahiti in the South Pacific. A principal objective of this expedition was to examine the variation of marine environments during the last deglaciation. As fossil Porites coral is ideal for assessing past marine environments, we selected only Porites specimens from the many coral specimens retrieved, examined them by XRD, and dated them by the 14C method. In all, we obtained 17 pristine Porites specimens composed of only aragonite with ages from 15 to 9 ka. Then, we measured Mg/Ca, Ba/Ca, and U/Ca ratios and Cd contents as proxies for upwelling and sea surface temperature. Higher Ba/Ca ratios and Cd content together with lower reconstructed SSTs using U/Ca ratios in the coral specimens between 12.6 and 9.8 cal ka compared to around 15 cal ka suggest that upwelling and/or entrainment of subsurface water into mixed layer was enhanced around Tahiti during this period. This finding is consistent with previous reports and supports the idea that the South Pacific was characterized by La Niña-like conditions at least from 12.6 to 9.8 cal ka.
    Keywords: 310-M0005B; 310-M0005C; 310-M0007A; 310-M0007B; 310-M0009D; 310-M0018A; 310-M0023A; Age, 14C AMS; Age, dated; Age, dated standard deviation; Area/locality; Calendar age; Calendar age, standard deviation; Depth, reconstructed; DP Hunter; DRILL; Drilling/drill rig; Elevation of event; Event label; Exp310; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Porites, Barium/Cadmium ratio; Porites, Cadmium; Porites, Magnesium/Calcium ratio; Porites, Uranium/Calcium ratio; Sample code/label; Sample ID; TAH-02A-4F; TAH-02A-5C; TAH-03A-1E; TAH-03A-3; TAH-03A-3A; TAH-03A-4A; TAH-03A-4B; Tahiti, offshore Maraa; Tahiti, offshore Tiarei; Tahiti Sea Level
    Type: Dataset
    Format: text/tab-separated-values, 203 data points
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    DATA PANGAEA
  • 5
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    (Table 1) Ages, dry bulk densities, and UK'37, sea surface temperatures, contents and fluxes of C37 alkenone of sediment core KT05-7_PC-02 (2009)
    PANGAEA
    Details
    Publication Date: 2024-01-25
    Keywords: Accumulation rate, alkenone C37; Accumulation rate, total organic carbon; AGE; Alkenone, C37 normalized to total organic carbon; Alkenone, unsaturation index UK37; Calcium carbonate; Carbon, organic, total; Carbon/Nitrogen ratio; Density, dry bulk; DEPTH, sediment/rock; KT05-7; KT05-7_PC-02; Nitrogen, total; PC; PC-02; Period; Piston corer; Sample code/label; Sea surface temperature, annual mean; Sedimentation rate; Tansei Maru; West Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 1013 data points
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  • 6
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    (Table 2) Occurrence of pollen and spores in sediment core KT05-7_PC-02 (2009)
    PANGAEA
    Details
    Publication Date: 2024-01-25
    Keywords: Abies; Acer; Actinostemma; Aesculus; Alisma; Alnus; Araliaceae; Arboreal pollen; Artemisia; Betula; Bioturbation; Brasenia; Bryophyte spores; Campanula; Carduoideae; Carpinus; Caryophyllaceae; Castanea; Castanopsis; Celtis; Cephalotaxaceae; Cercidiphyllum; Chenopodiaceae; Cichorioideae; Cornus; Corylus; Cruciferae; Cryptomeria; Cyperaceae; Daphniphyllum; DEPTH, sediment/rock; Ephedra; Ericaceae; Fagus; Fraxinus; Geranium; Gramineae; Ilex; Juglans; KT05-7; KT05-7_PC-02; Labiatae; Larix; Leguminosae; Liliaceae; Lycopodium; Lysichiton; Moraceae; Myrica; Non arboreal pollen; Nuphar; Osmunda; PC; PC-02; Phellodendron; Picea; Pinus; Pinus subgen. Diploxylon; Pinus subgen. Haploxylon; Piston corer; Platycarya obliqua; Pollen, total; Pollen indeterminata; Polygonum; Polygonum sect. Persicaria; Prunus; Pteridophyta indeterminata; Pterocarya; Quercus subgen. Cyclobalanopsis; Quercus subgen. Lepidobalanus; Ranunculaceae; Rhamnaceae; Rhus; Rosaceae; Rumex; Salix; Sample code/label; Sciadopitys; Selaginella selaginoides; Sphagnum; Styrax; Tansei Maru; Thalictrum; Tilia; Tsuga; Typha; Ulmus; Umbelliferae; Viburnum; Vitis; West Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 2241 data points
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  • 7
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    (Table 3) Stable carbon isotope ratios of benthic foraminifera from sediment core KT05-7_PC-02 (2009)
    PANGAEA
    Details
    Publication Date: 2024-01-25
    Keywords: Depth, composite; DEPTH, sediment/rock; KT05-7; KT05-7_PC-02; Nonionella stella, δ13C; Nonionellina labradorica, δ13C; PC; PC-02; Piston corer; Sample code/label; Tansei Maru; West Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 226 data points
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    DATA PANGAEA
  • 8
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    (Table 4) Radiocarbon analysis, coralline algae and microbialites from Papeete drill cores (2011)
    PANGAEA
    Details
    Publication Date: 2024-01-25
    Keywords: Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; Age, difference; Age, difference error; Aragonite; Calculated; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Papeete_P10; Papeete_P6-1; Papeete_P6-2; Papeete_P6-3; Papeete_P6-4; Papeete_P7; Papeete_P8; Papeete_P9; Sample code/label 2; Tahiti, French Polynesia
    Type: Dataset
    Format: text/tab-separated-values, 110 data points
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  • 9
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    (Table 1) Age determination of sediment core KY07-04-PC1 (2010)
    PANGAEA
    In:  Supplement to: Kubota, Yoshimi; Kimoto, Katsunori; Tada, Ryuji; Oda, Hirokuni; Yokoyama, Yusuke; Matsuzaki, Hiroyuki (2010): Variations of East Asian summer monsoon since the last deglaciation based on Mg/Ca and oxygen isotope of planktic foraminifera in the northern East China Sea. Paleoceanography, 25(4), PA4205, https://doi.org/10.1029/2009PA001891
    Details
    Publication Date: 2024-01-25
    Description: Variations in Mg/Ca-based sea surface temperature and oxygen isotope ratio (d18O) of the surface water in the northern East China Sea (ECS) were reconstructed with high resolution during the last 18 kyr using planktic foraminifera. Millennial-scale variations between warmer, more saline surface water and cooler, less saline surface water were recognized during the early deglacial period and the Holocene, suggesting changes in the mixing ratio between the Kuroshio Water and the Changjiang Diluted Water. Stronger East Asian summer monsoon (EASM) precipitation events in south China are identified at 10.5, 8.8, 7.0, 5.3, 4.7, 2.9, 1.7, and 0.5 ka, based on sea surface salinity (SSS) records of the northern ECS. Weaker EASM precipitation events are also detected at 9.3, 8.3, 7.3, 6.0, 3.3, 2.3, 0.7, and 0.4 ka during the Holocene. These events agree with the maxima in d18O records of stalagmites from various parts of the Changjiang (Yangtze) River drainage. This agreement supports that our SSS record properly captures the millennial-scale dry (less EASM precipitation) events over the drainage basin of the Changjiang River during the Holocene. These dry events are also in good agreement with North Atlantic ice-rafted events, suggesting a teleconnection between North Atlantic climate and the EASM during the Holocene.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated material; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; Calendar age; Calendar age, standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; KY07-04-PC1
    Type: Dataset
    Format: text/tab-separated-values, 162 data points
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    DATA PANGAEA
  • 10
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    (Table 5) Aragonite content and high magnesium calcite contents from different IODP Holes from Exp 310 (2011)
    PANGAEA
    Details
    Publication Date: 2024-01-25
    Keywords: 310-M0007A; 310-M0016A; 310-M0023A; 310-M0024A; 310-M0025B; Age, 14C AMS; Age, dated; Age, dated standard deviation; Aragonite; Description; DP Hunter; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp310; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Magnesium-Calcite; Sample code/label; Sample mass; TAH-02A-4F; TAH-02A-5F; TAH-02A-5H; TAH-03A-1A; TAH-03A-3; Tahiti, offshore Maraa; Tahiti, offshore Tiarei; Tahiti Sea Level; X-ray diffraction (XRD)
    Type: Dataset
    Format: text/tab-separated-values, 176 data points
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