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  • 1
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    Foraminifera stable oxygen isotopes and Mg/Ca analysis and reconstructed water stable oxygen isotopes and sea surface temperature in sediment core MD05-2925 (2022)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: This dataset contains surface (Globigerninodes ruber) and subsurface (Pulleniatina obliquiloculata) planktonic foraminiferal geochemical proxies data (d18O of carbonate, Mg/Ca ratios and inferred seawater temperatures, ice volume corrected d18O of seawater) and composite benthic foraminiferal d18O stratigraphy at core MD05-2925 in the Solomon Sea during the past 568-kyr. Constants of seawater temperature calculation and ice volume correction please check Lo et al. (2022, Quaternary Science Reviews). High resolution (~0.5 kyr) for vertical thermal and hydrological variations in the southwestern equatorial Pacific Ocean across the past five glacial-interglacial cycles and glacial terminations are crucial for paleoceanographic studies in the Western Pacific Warm Pool region.
    Type: dataset bundled publication
    Format: application/zip, 9 datasets
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  • 2
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    Age model, oxygen isotopes and Mg/Ca ratios from plantonik foraminifera of sediment core MD05-2925 off the Solomon Sea (2019)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: The paleoclimatic sensitivity to atmospheric greenhouse gases (GHGs) has recently been suggested to be nonlinear, however a GHG threshold value associated with deglaciation remains uncertain. Here, we combine a new sea surface temperature record spanning the last 360,000 years from the southern Western Pacific Warm Pool with records from five previous studies in the equatorial Pacific to document the nonlinear relationship between climatic sensitivity and GHG levels over the past four glacial/interglacial cycles. The sensitivity of the responses to GHG concentrations rises dramatically by a factor of 2-4 at atmospheric CO2 levels of 〉220 ppm. Our results suggest that the equatorial Pacific acts as a nonlinear amplifier that allows global climate to transition from deglacial to full interglacial conditions once atmospheric CO2 levels reach threshold levels.
    Type: dataset publication series
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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  • 3
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    Age and isotopic analysis of Globigerinoides sacculifer from ODP Hole180-1115B (2019)
    PANGAEA
    In:  Supplement to: Chuang, Chih-Kai; Lo, Li; Zeeden, Christian; Chou, Yu-Min; Wei, Kuo-Yen; Shen, Chuan-Chou; Mii, Horng-Sheng; Chang, Yuan-Pin; Tung, Ying-Hung (2018): Integrated stratigraphy of ODP Site 1115 (Solomon Sea, southwestern equatorial Pacific) over the past 3.2 Ma. Marine Micropaleontology, 144, 25-37, https://doi.org/10.1016/j.marmicro.2018.09.003
    Details
    Publication Date: 2024-07-19
    Description: We provide an integrated stratigraphy for the southern margin of the Indo-Pacific Warm Pool back to 3.2 million years ago (Ma) from ODP Site 1115, Hole B (9o11'S, 151o34'E, water depth 1149 m, 0-217 m below sea floor), the only hole with core recovery beyond 4.4 m. An initial age model based on 14 calcareous nannofossil datums, 5 planktonic foraminiferal biostratigraphic events and 12 magnetic polarity reversals is refined by planktonic foraminiferal Globigerinoides sacculifer (300-355 μm) δ18O stratigraphy. The planktonic δ18O record with an average 3-4 kyr resolution matches the global stack LR04 (Lisiecki and Raymo, 2005). The 41-kyr obliquity and 100-kyr eccentricity patterns show good correlation between the LR04 and the dataset presented herein. The precession amplitude matches eccentricity, supporting the established stratigraphy. Sedimentation rates at Hole 1115B have decreased from 9.3 to 4.5 cm/kyr during the past 3.2 Ma toward present, mainly due to the gradual deepening of the Woodlark Basin. The planktonic δ18O record from Site 1115 matches the global climate evolution well.
    Type: dataset publication series
    Format: application/zip, 2 datasets
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  • 4
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    Carbon and oxygen isotopic compositions of Permian and Carboniferous brachiopod shells from Russia, the United States and various world-wide localities along with metadata for shell preservation (cathodoluminescence, trace element compositions) (2020)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Description: To evaluate the isotopic record of climate change and carbon sequestration in the Late Paleozoic, we have compiled new and published oxygen and carbon isotopic measurements of more than 2000 brachiopod shells from Carboniferous through Middle Permian (359-260 Ma) strata worldwide. We focus on the isotopic records from the U.S. Midcontinent and the Russian Platform because these two regions provide well-preserved marine fossils spanning a broad time interval. Brachiopod shells were processed and screened for diagenesis by different methods depending on the research group. Some groups crush shells and pick clear crystals under the microscope. Five to ten milligrams of Ca carbonate are analyzed for trace and minor elements (Mg, Sr, Fe, Mn). Other research groups thin-section shells and use cathodoluminscence and plane light microscopy to screen for diagenesis. Nonluminescent shell is microsampled (0.05-0.1 mg) on the thin-section or complementary billet. All research groups use isotope ratio mass spectrometer for carbon (13C/12C) and oxygen (18O/16O) analyses. These data are used to examine paleotemperatures and their relation to climate in the past.
    Keywords: Brachiopods; Carbon cycling; Carboniferous; Paleoclimate; Permian; Stable isotopes
    Type: dataset bundled publication
    Format: application/zip, 4 datasets
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  • 5
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    Age model and Nd/Ca ratio of planktonic foraminifera from sediment core MD05-2925 off the Solomon Sea (2019)
    PANGAEA
    In:  Supplement to: Liu, Yi; Lo, Li; Shi, Zhengguo; Wei, Kuo-Yen; Chou, Chien-Ju; Chen, Yi-Chi; Chuang, Chih-Kai; Wu, Chung-Che; Mii, Horng-Sheng; Peng, Zicheng; Amakawa, Hiroshi; Burr, George S; Lee, Shih-Yu; Elderfield, Henry; Shen, Chuan-Chou (2015): Obliquity pacing of the western Pacific Intertropical Convergence Zone over the past 282,000 years. Nature Communications, 6(1), https://doi.org/10.1038/ncomms10018
    Details
    Publication Date: 2024-07-19
    Description: Abstract: The Intertropical Convergence Zone (ITCZ) encompasses the heaviest rain belt on the Earth. Few direct long-term records, especially in the Pacific, limit our understanding of long-term natural variability for predicting future ITCZ migration. Here we present a tropical precipitation record from the Southern Hemisphere covering the past 282,000 years, inferred from a marine sedimentary sequence collected off the eastern coast of Papua New Guinea. Unlike the precession paradigm expressed in its East Asian counterpart, our record shows that the western Pacific ITCZ migration was influenced by combined precession and obliquity changes. The obliquity forcing could be primarily delivered by a cross-hemispherical thermal/pressure contrast, resulting from the asymmetric continental configuration between Asia and Australia in a coupled East Asian-Australian circulation system. Our finding suggests that the obliquity forcing may play a more important role in global hydroclimate cycles than previously thought.
    Keywords: After Lo et al. 2017; AGE; CALYPSO2; Calypso Corer II; DEPTH, sediment/rock; Egum; Globigerinoides ruber, Neodymium/Calcium ratio; Globigerinoides sacculifer, Neodymium/Calcium ratio; IMAGES XIII - PECTEN; Intertropical Convergence Zone; Marion Dufresne (1995); MD052925; MD05-2925; MD148; Monsoon; Orbital pacing; Pulleniatina obliquiloculata, Neodymium/Calcium ratio; Western Pacific Warm Pool
    Type: dataset
    Format: text/tab-separated-values, 548 data points
    Location Call Number Limitation Availability
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  • 6
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    Age model, oxygen isotopes and Mg/Ca ratios of Globigerinoides ruber from sediment core ORI715-21 off the Kuroshio Current, eastern Taiwan (2019)
    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
    Details
    Publication Date: 2024-07-19
    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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  • 7
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    (Table 3) Age model of ODP Hole 195-1202D (2009)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Keywords: 195-1202D; Age model; DEPTH, sediment/rock; DRILL; Drilling/drill rig; East China Sea; Joides Resolution; Leg195; Ocean Drilling Program; ODP
    Type: dataset
    Format: text/tab-separated-values, 24 data points
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  • 8
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    (Table 1) Correlation tie-points of ODP Hole 195-1202D (2009)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Keywords: 195-1202D; Age, comment; Age model; DEPTH, sediment/rock; DRILL; Drilling/drill rig; East China Sea; Joides Resolution; Leg195; Ocean Drilling Program; ODP
    Type: dataset
    Format: text/tab-separated-values, 36 data points
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  • 9
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    (Table 1) Correlation tie-points of ODP Hole 195-1202B (2009)
    PANGAEA
    Details
    Publication Date: 2024-07-19
    Keywords: 195-1202B; Age, comment; Age model; DEPTH, sediment/rock; DRILL; Drilling/drill rig; East China Sea; Joides Resolution; Leg195; Ocean Drilling Program; ODP
    Type: dataset
    Format: text/tab-separated-values, 36 data points
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  • 10
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    Stable isotope and Mg/Ca record of Globigerinoides ruger morphotypes (2005)
    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
    Details
    Publication Date: 2024-08-15
    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 publication series
    Format: application/zip, 4 datasets
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