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  • 1
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    PANGAEA
    In:  Supplement to: Lo, Li; Lai, Yung-Hsiang; Wei, Kuo-Yen; Lin, Yu-Shih; Mii, Horng-Sheng; Shen, Chuan-Chou (2013): Persistent sea surface temperature and declined sea surface salinity in the northwestern tropical Pacific over the past 7500years. Journal of Asian Earth Sciences, 66, 234-239, https://doi.org/10.1016/j.jseaes.2013.01.014
    Publication Date: 2023-02-12
    Description: To understand Holocene climate evolutions in low-latitude region of the western Pacific, paired δ18O and Mg/Ca records of planktonic foraminifer Globigerinoides ruber (250-300 μm, sensu stricto, s.s.) from a marine core ORI715-21 (121.5°E, 22.7°N, water depth 760 m) underneath the Kuroshio Current (KC) off eastern Taiwan were analyzed. Over the past 7500 years, the geochemical proxy-inferred sea surface temperature (SST) hovered around 27-28 °C and seawater δ18O (δ18OW) slowly decreased 0.2-0.4‰ for two KC sites at 22.7° and 25.3°N. Comparison with a published high-SST and high-salinity equatorial tropical Pacific record, MD98-2181 located at the Mindanao Current (MC) at 6.3°N, reveals an anomalous time interval at 3.5-1.5 kyr ago (before 1950 AD). SST gradient between the MC site and two KC site decrease from 1.5-2.0 °C to only 0-1 °C, and δ18OW from 0.1-0.3‰ to 0‰ for this 2-kyr time window. The high SST and low gradient could result from a northward shift of the North Equatorial Current, which implies a weakened KC. The long-term descending δ18OW and increasing precipitation in the entire low-latitude western Pacific and the gradually decreasing East Asian summer monsoonal rainfall during middle-to-late Holocene is likely caused by different land and ocean responses to solar insolation and/or enhanced moisture transportation from the Atlantic to Pacific associated with the southward movement of ITCZ.
    Keywords: AGE; Core; CORE; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Holocene; Kuroshio Current; Mindanao Current; North Equatorial Current; Northwestern Pacific; ORI715-21; Sea surface salinity; Sea surface temperature; Seawater δ18O; δ18O, seawater, reconstructed
    Type: Dataset
    Format: text/tab-separated-values, 455 data points
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  • 2
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    PANGAEA
    In:  Supplement to: Steinke, Stephan; Chiu, Han-Yi; Yu, Pai-Sen; Shen, Chuan Chou; Erlenkeuser, Helmut; Löwemark, Ludvig; Chen, Min-Te (2006): On the influence of sea level and monsoon climate on the southern South China Sea freshwater budget over the last 22,000 years. Quaternary Science Reviews, 25(13-14), 1475-1488, https://doi.org/10.1016/j.quascirev.2005.12.008
    Publication Date: 2023-06-27
    Description: Changes in the local freshwater budget over the last 22,000 years have been estimated from a sediment core located in the southern South China Sea (SCS) using a combined approach of Mg/Ca and oxygen isotopes on the planktonic foraminifera Globigerinoides ruber (white) sensu stricto (s.s.). Core MD01-2390 (06°28,12N, 113°24,56E; water depth 1591 m) is located near the glacial paleo-river mouths of the Baram, Rajang and North Sunda/Molengraaff Rivers that drained the exposed Sunda Shelf. The delta18Oseawater record reveals lower average values (-0.96±0.18 per mil) during the Last Glacial Maximum (LGM) when compared with modern values (-0.54±0.18 per mil). Low salinity during the LGM is interpreted to reflect a higher freshwater contribution due to a greater proximity of the core site to the mouths of the Baram, Rajang and North Sunda/Molengraaff Rivers at that time. A general deglacial increasing trend in salinity due to the progressive landward displacement of the coastline during deglacial shelf flooding is punctuated by several short-term shifts towards higher and lower salinity that are likely related to abrupt changes in the intensity of the East Asian summer monsoon. Thus, the deglacial delta18Oseawater changes reflect the combined effects of sea-level-induced environmental changes on the shelf (e.g. phases of retreat and breakdown of the shelf drainage systems) and East Asian monsoon climate change. Lower salinity than at present during the Early Holocene may be attributed to an increase in summer monsoonal precipitation that is corroborated by previous marine and terrestrial studies that report a Preboreal-Early Holocene monsoon optimum in the Asian monsoon region.
    Keywords: Giant piston corer; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; Marion Dufresne (1995); MD012390; MD01-2390; MD122; Planktic Foraminifers; South China Sea
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 3
    Publication Date: 2023-06-27
    Keywords: AGE; Calculated; Comment; Counting 〉150 µm fraction; DEPTH, sediment/rock; Fragmentation index, planktic foraminifera; Giant piston corer; Globigerinoides ruber white; Globigerinoides ruber white, δ18O; GPC; IMAGES; IMAGES VII - WEPAMA; Inductively coupled plasma - mass spectrometry (ICP-MS); International Marine Global Change Study; Magnesium/Calcium ratio; Marion Dufresne (1995); Mass spectrometer Finnigan MAT 251; MD012390; MD01-2390; MD122; Planktic Foraminifers; Pteropoda; Sea surface temperature, annual mean; South China Sea; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 814 data points
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  • 4
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    PANGAEA
    In:  Supplement to: DeLong, Kristine; Quinn, Terrence Michael; Shen, Chuan Chou; Lin, Ke (2010): A snapshot of climate variability at Tahiti at 9.5 ka using a fossil coral from IODP Expedition 310. Geochemistry, Geophysics, Geosystems, 11, 1-14, https://doi.org/10.1029/2009GC002758
    Publication Date: 2023-06-27
    Description: The Integrated Ocean Drilling Program (IODP) Expedition 310 recovered drill cores from the drowned reefs around the island of Tahiti (17°40'S, 149°30'W), many of which contained samples of massive corals from the genus Porites. Herein we report on one well-preserved fossil coral sample: a 13.6 cm long Porites sp. dated by uranium series techniques at 9523 ± 33 years. Monthly delta18O and Sr/Ca determinations reveal nine clear and robust annual cycles. Coral delta18O and Sr/Ca determinations estimate a mean temperature of ca. 24.3°C (ca. 3.2°C colder than modern) for Tahiti at 9.5 ka; however, this estimate is viewed with caution since potential sources of cold bias in coral geochemistry remain to be resolved. The interannual variability in coral delta18O is similar between the 9.5 ka coral record and a modern record from nearby Moorea. The seasonal cycle in coral Sr/Ca is approximately the same or greater in the 9.5 ka coral record than in modern coral records from Tahiti. Paired analysis of coral delta18O and Sr/Ca indicates cold/wet (warm/dry) interannual anomalies, opposite from those observed in the modern instrumental record.
    Keywords: 310-M0007B; Age, dated; Age, dated standard deviation; Corrected; DEPTH, sediment/rock; DP Hunter; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Exp310; ID-ICP-MS, Isotope dilution - inductively coupled plasma - mass spectrometry; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Mass; Mass spectrometer Finnigan Delta Plus XL; Sample code/label; TAH-03A-3A; Tahiti, offshore Maraa; Tahiti Sea Level; Thorium-230/Thorium-232 ratio; Thorium-230/Thorium-232 ratio error; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; δ234 Uranium; δ234 Uranium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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  • 5
    Publication Date: 2023-06-27
    Keywords: Age, 14C AMS; Age, 14C calibrated, CALIB 4.3 (Stuiver et al., 1998); Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; DEPTH, sediment/rock; Giant piston corer; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; Marion Dufresne (1995); MD012390; MD01-2390; MD122; Sample code/label; South China Sea
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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  • 6
    Publication Date: 2023-06-27
    Keywords: DEPTH, sediment/rock; Giant piston corer; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ18O; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; Isotope ratio mass spectrometry; Marion Dufresne (1995); MD012390; MD01-2390; MD122; South China Sea
    Type: Dataset
    Format: text/tab-separated-values, 38 data points
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  • 7
    Publication Date: 2023-06-27
    Keywords: DEPTH, sediment/rock; Event label; Giant box corer; Giant piston corer; GIK18381-1; GIK18387-1; GIK18393-1; GIK18395-1; GKG; Globigerinoides ruber white, δ13C; Globigerinoides ruber white, δ18O; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; Isotope ratio mass spectrometry; Marion Dufresne (1995); MD012377; MD01-2377; MD012378; MD01-2378; MD012379; MD01-2379; MD012391; MD01-2391; MD012398; MD01-2398; MD122; SO140A; Sonne; South China Sea; SÜDMEER III; Timor Sea
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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  • 8
    Publication Date: 2023-06-27
    Keywords: Atomic absorption spectrometry, graphite furnace (GF-AAS); Calculated; DEPTH, sediment/rock; Giant piston corer; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; Magnesium/Calcium ratio; Marion Dufresne (1995); MD012390; MD01-2390; MD122; Sea surface temperature, annual mean; South China Sea
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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  • 9
    Publication Date: 2024-02-13
    Keywords: Arabian Sea; Atomic absorption spectrometry, graphite furnace (GF-AAS); Calculated; DEPTH, sediment/rock; Event label; Giant box corer; Giant piston corer; GIK18381-1; GIK18387-1; GIK18393-1; GIK18395-1; GKG; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; KAL; Kasten corer; KL-36, AS-04; Magnesium/Calcium ratio; Marion Dufresne (1995); MD012377; MD01-2377; MD012378; MD01-2378; MD012379; MD01-2379; MD012391; MD01-2391; MD012398; MD01-2398; MD122; Sea surface temperature, annual mean; Size fraction; SO140A; SO42; SO42-36KL; Sonne; South China Sea; SÜDMEER III; Timor Sea
    Type: Dataset
    Format: text/tab-separated-values, 50 data points
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  • 10
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    PANGAEA
    In:  Supplement to: Steinke, Stephan; Chiu, Han-Yi; Yu, Pai-Sen; Shen, Chuan Chou; Löwemark, Ludvig; Mii, Horng-Sheng; Chen, Min-Te (2005): Mg/Ca ratios of two Globigerinoides ruber (white) morphotypes: Implications for reconstructing past tropical/subtropical surface water conditions. Geochemistry, Geophysics, Geosystems, 6, Q11005, https://doi.org/10.1029/2005GC000926
    Publication Date: 2024-02-13
    Description: Tests of the planktonic foraminifer Globigerinoides ruber (white; d'Orbigny) have become a standard tool for reconstructing past oceanic environments. Paleoceanographers often utilize the Mg/Ca ratios of the foraminiferal tests for reconstructing low-latitude ocean glacial-interglacial changes in sea surface temperatures (SST). We report herein a comparison of Mg/Ca measurements on sample pairs (n = 20) of two G. ruber (white) morphotypes (G. ruber sensu stricto (s.s.) and G. ruber sensu lato (s.l.)) from surface and downcore samples of the western Pacific and Indian Oceans. G. ruber s.s. refers to specimens with spherical chambers sitting symmetrically over previous sutures with a wide, high arched aperture, whereas G. ruber s.l. refers to a more compact test with a diminutive final chamber and small aperture. The G. ruber s.s. specimens generally show significantly higher Mg/Ca ratios compared to G. ruber s.l. Our results from the Mg/Ca ratio analysis suggest that G. ruber s.l. specimens precipitated their shells in slightly colder surface waters than G. ruber s.s. specimens. This conclusion is supported by the differences in delta18O and delta13C values between the two morphotypes. Although it is still unclear if these two morphotypes represent phenotypic variants or sibling species, our findings seem to support the hypothesis of depth and/or seasonal allopatry within a single morphospecies.
    Keywords: Arabian Sea; Giant box corer; Giant piston corer; GIK18381-1; GIK18387-1; GIK18393-1; GIK18395-1; GKG; GPC; IMAGES; IMAGES VII - WEPAMA; International Marine Global Change Study; KAL; Kasten corer; KL-36, AS-04; Marion Dufresne (1995); MD012377; MD01-2377; MD012378; MD01-2378; MD012379; MD01-2379; MD012390; MD01-2390; MD012391; MD01-2391; MD012398; MD01-2398; MD122; SO140A; SO42; SO42-36KL; Sonne; South China Sea; SÜDMEER III; Timor Sea
    Type: Dataset
    Format: application/zip, 4 datasets
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