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  • 11
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    Measurements of sediments from Core MD01-2378 and IODP Site 363-U1483 (2020)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Description: The Intertropical Convergence Zone (ITCZ), which is the heaviest rain belt on Earth, significantly influences global hydroclimate change and livelihood of nearly 40% of the global population. However, long-term precipitation records are sparse from the Indo-Pacific region, especially from the southern margin of the Indo-Pacific ITCZ, restricting our understanding of the overall natural variability of the ITCZ in the past. In this study, we present a new summer monsoonal precipitation record that spans the last 410 kyr from the southern margin of the Indo-Pacific ITCZ, based on the logarithmic ratio between terrigenous fraction K and pelagic fraction Ca (ln(K/Ca)). Contents of the both elements were derived from X-ray fluorescence scanning on sediment cores from Site U1483 (13°05.24′ S, 121°48.25′ E, water depth 1733 m) that was drilled offshore northwestern Australia during International Ocean Discovery Program Expedition 363. Comparison of the new precipitation record with published precipitation records from the northern margin and meteorological centre of the Indo-Pacific ITCZ shows that precipitation changed nearly in phase between the hemispheres on the precession band, possibly linked to expansion and contraction in the latitudinal extent of the Indo-Pacific ITCZ. In contrast, interhemispheric precipitation was nearly in anti-phase on the obliquity band, likely due to latitudinal migration of the Indo-Pacific ITCZ. Our findings imply that tropical hydroclimate cycles were regulated by the orbital forcing but with significantly different response to changes of the ITCZ on precession and obliquity bands.
    Keywords: IMAGES; Integrated Ocean Drilling Program / International Ocean Discovery Program; International Marine Global Change Study; IODP
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 12
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    XRF scanning of sediments core MD01-2378 (2020)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; Calcium; DEPTH, sediment/rock; Giant piston corer; GPC; IMAGES; IMAGES VII - WEPAMA; Integrated Ocean Drilling Program / International Ocean Discovery Program; International Marine Global Change Study; IODP; Marion Dufresne (1995); MD012378; MD01-2378; MD122; Potassium; Timor Sea; X-ray fluorescence core scanner (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 3770 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 13
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    Stable oxygen isotope and Mg/Ca records from main pathway of Indonesian Throughflow (2021)
    PANGAEA
    Details
    Publication Date: 2023-11-03
    Description: The Indonesian Throughflow (ITF), as the sole low-latitude conduit connecting the Pacific and Indian Oceans, regulates the thermohaline balance between these oceans. Investigating the spatio-temporal variability of the ITF and its relationship to precessional forcing is, thus, crucial for understanding the drivers of tropical climate change. Here, we reconstruct the history of the ITF over the past ~120 kyr, based on high resolution (~400 yr) δ18O and Mg/Ca records of Globigerinoides ruber and Pulleniatina obliquiloculata from Core SO217-18540 retrieved from the Flores Sea upwelling region within the main pathway of the ITF. Comparison of these new records with published paleo-oceanographic and climatological data from the western tropical Pacific suggests that annual mean conditions in the Flores Sea were controlled by the ITF rather than by monsoonal upwelling. Our results further indicate that precessional insolation was a major forcing for the hydrological evolution of the ITF during the past 120 kyr. We suggest that precessional insolation forcing paced ITF variability by modulating the mean state of El Niño-Southern Oscillation-like conditions and latitudinal shifts or expansion/contraction of the Intertropical Convergence Zone.
    Keywords: Cibicidoides wuellerstorfi; Flores Sea; GIK18540-3; Globigerinoides ruber; KL; MAJA; Mg/Ca ratio; Piston corer (BGR type); Pulleniatina obliquiloculata; SO217; SO217_26-3; Sonne; stable oxygen isotope
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 14
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    Benthic foraminifer stable oxygen isotope of sediment core SO18540 (2021)
    PANGAEA
    Details
    Publication Date: 2023-11-03
    Keywords: AGE; Cibicidoides wuellerstorfi; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Flores Sea; GIK18540-3; Globigerinoides ruber; KL; MAJA; Mg/Ca ratio; Piston corer (BGR type); Pulleniatina obliquiloculata; SO217; SO217_26-3; Sonne; stable oxygen isotope
    Type: Dataset
    Format: text/tab-separated-values, 339 data points
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  • 15
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    Planktonic foraminifer stable oxygen isotope and MgCa records of sediment core SO18540 (2021)
    PANGAEA
    Details
    Publication Date: 2023-11-03
    Keywords: AGE; Cibicidoides wuellerstorfi; DEPTH, sediment/rock; Flores Sea; GIK18540-3; Globigerinoides ruber; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; KL; MAJA; Mg/Ca ratio; Piston corer (BGR type); Pulleniatina obliquiloculata; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Pulleniatina obliquiloculata, δ18O; Sea surface temperature; SO217; SO217_26-3; Sonne; stable oxygen isotope; Temperature, difference; Thermocline water temperature; δ18O, seawater, reconstructed
    Type: Dataset
    Format: text/tab-separated-values, 2678 data points
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    DATA PANGAEA
  • 16
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    Seawater carbonate chemistry and auditory behavior of Orange clownfish (Amphiprion percula) during experiments, 2011 (2011)
    PANGAEA
    In:  Supplement to: Simpson, Stephen D; Munday, Philip L; Wittenrich, Matthew L; Manassa, Rachel; Dixon, Danielle L; Gagliano, Monica; Yan, Hong Y (2011): Ocean acidification erodes crucial auditory behaviour in a marine fish. Biology Letters, 7(6), 917-920, https://doi.org/10.1098/rsbl.2011.0293
    Details
    Publication Date: 2024-03-15
    Description: Ocean acidification is predicted to affect marine ecosystems in many ways, including modification of fish behaviour. Previous studies have identified effects of CO2-enriched conditions on the sensory behaviour of fishes, including the loss of natural responses to odours resulting in ecologically deleterious decisions. Many fishes also rely on hearing for orientation, habitat selection, predator avoidance and communication. We used an auditory choice chamber to study the influence of CO2-enriched conditions on directional responses of juvenile clownfish (Amphiprion percula) to daytime reef noise. Rearing and test conditions were based on Intergovernmental Panel on Climate Change predictions for the twenty-first century: current-day ambient, 600, 700 and 900 µatm pCO2. Juveniles from ambient CO2-conditions significantly avoided the reef noise, as expected, but this behaviour was absent in juveniles from CO2-enriched conditions. This study provides, to our knowledge, the first evidence that ocean acidification affects the auditory response of fishes, with potentially detrimental impacts on early survival.
    Keywords: Alkalinity, total; Amphiprion percula; Animalia; Aragonite saturation state; Behaviour; Bicarbonate ion; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chordata; Coast and continental shelf; Containers and aquaria (20-1000 L or 〈 1 m**2); EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Measured; Nekton; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; pH meter (HQ11D, Hach Co., Loveland, CO); Proportion of time; Proportion of time, standard error; Salinity; Single species; South Pacific; Species; Temperature, standard deviation; Temperature, water; Titration; Tropical
    Type: Dataset
    Format: text/tab-separated-values, 100 data points
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    DATA PANGAEA
  • 17
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    Synchronicity of Kuroshio Current and climate system variability since the Last Glacial Maximum (2016)
    ELSEVIER SCIENCE BV
    In:  EPIC3Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 452, pp. 247-257, ISSN: 0012-821X
    Details
    Publication Date: 2018-08-10
    Description: The Kuroshio Current (KC) is the northward branch of the North Pacific subtropical gyre (NPG) and exerts influence on the exchange of physical, chemical, and biological properties of downstream regions in the Pacific Ocean. Resolving long-term changes in the flow of the KC water masses is, therefore, crucial for advancing our understanding of the Pacific's role in global ocean and climate variability. Here, we reconstruct changes in KC dynamics over the past 20 ka based on grain-size spectra, clay mineral, and Sr–Nd isotope constraints of sediments from the northern Okinawa Trough. Combined with published sediment records surrounding the NPG, we suggest that the KC remained in the Okinawa Trough throughout the Last Glacial Maximum. Together with Earth-System-Model simulations, our results additionally indicate that KC intensified considerably during the early Holocene (EH). The synchronous establishment of the KC “water barrier” and the modern circulation pattern during the EH highstand shaped the sediment transport patterns. This is ascribed to the precession-induced increase in the occurrence of La Niña-like state and the strength of the East Asian summer monsoon. The synchronicity of the shifts in the intensity of the KC, Kuroshio extension, and El Niño/La Niña-Southern Oscillation (ENSO) variability may further indicate that the western branch of the NPG has been subject to basin-scale changes in wind stress curl over the North Pacific in response to low-latitude insolation. Superimposed on this long-term trend are high-amplitude, large century, and millennial-scale variations during last 5 ka, which are ascribed to the advent of modern ENSO when the equatorial oceans experienced stronger insolation during the boreal winter.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 18
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    South China Sea hydrological changes and Pacific Walker Circulation variations over the last millennium (2011)
    Nature Publishing Group
    Details
    Publication Date: 2022-05-25
    Description: © Macmillan Publishers Limited, 2011. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Nature Communications 2 (2011): 293, doi:10.1038/ncomms1297.
    Description: The relative importance of north–south migrations of the intertropical convergence zone (ITCZ) versus El Niño-Southern Oscillation and its associated Pacific Walker Circulation (PWC) variability for past hydrological change in the western tropical Pacific is unclear. Here we show that north–south ITCZ migration was not the only mechanism of tropical Pacific hydrologic variability during the last millennium, and that PWC variability profoundly influenced tropical Pacific hydrology. We present hydrological reconstructions from Cattle Pond, Dongdao Island of the South China Sea, where multi-decadal rainfall and downcore grain size variations are correlated to the Southern Oscillation Index during the instrumental era. Our downcore grain size reconstructions indicate that this site received less precipitation during relatively warm periods, AD 1000–1400 and AD 1850–2000, compared with the cool period (AD 1400–1850). Including our new reconstructions in a synthesis of tropical Pacific records results in a spatial pattern of hydrologic variability that implicates the PWC.
    Description: This work was supported by the Natural Science Foundation of China (NSFC) (40730107) and the Major State Basic Research Development Program of China (973 Program) (No.2010CB428902). DWO acknowledges support from the US NSF.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Study on Thixo-Forging of AZ61 Wrought Magnesium Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 677-682 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The semi-solid AZ61 wrought magnesium alloy was fabricated by mechanical stirringmethod. Thixo-forging set-up were designed and made. The traditional forging and thixo-forgingprocesses of AZ61 magnesium alloy were studied with both computer numerical simulation andexperimental methods. The constitutive model of semi-solid AZ61 alloy was established in our priorliterature. The differences between traditional forging and thixo-forging processes were analyzed.Results indicated that smaller load and uniform strain & stress were acquired in thixo-extrusionprocess. Simulation results were good agreement with experimental ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.677.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Semi-Solid AZ91D Magnesium Alloy in Thixoforming Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 505-510 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In the process of metal plastic forming severe plastic deformations occur to the workpiece.As a result the constitutive relations between material and geometry are nonlinear. One of the mostcommon tools to solve such problems is the finite element method. In thixoforming processes ofsemi-solid metal many factors affect thixoforming fluidity. Therefore it is important to simplify theproblem and predict the metal flow properties. For that reason the thixoforming process of semi-solidAZ91D magnesium alloy was modeled with the theory of rigid viscoplastic finite element methodusing the commercial finite element software DEFORM-3DTM. The fluid and effective stress-strainfields in the thixoforming process were obtained and the relationships among stress, strain rate andtemperature were analyzed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.505.pdf
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