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  • 2020-2024  (6)
  • 2020-2022  (1)
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Year
  • 1
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    South Pacific Convergence Zone (SPCZ) magnetic susceptibility (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: Age; Age, maximum/old; Age, minimum/young; DEPTH, sediment/rock; dinosterol; Event label; GCUWI; Gravity corer, UWITEC; Holocene; Hydrogen isotopes; Lac Lalolalo, 'Uvea, Wallis et Futuna; Lac Lanutavake, 'Uvea, Wallis et Futuna; Lake Emaotul, Efate, Vanuatu; Lake Lanotoo, Upolu, Samoa; lakes; Magnetic susceptibility; Mean values; Median values; Multi-Sensor Core Logger, GEOTEK with Bartington Instruments MS2E sensor; Organic Geochemistry; paleohydrology; Paleolimnology; PCOR; Percussion corer; Section; Sedimentology; South Pacific Convergence Zone; SPCZ_Efate_VAN; SPCZ_Upolu_LAN; SPCZ_Uvea_LALOUC13; SPCZ_Uvea_LALOUC14; SPCZ_Uvea_LATVKUC1; SPCZ_Uvea_LATVKUC4; tropical Pacific
    Type: Dataset
    Format: text/tab-separated-values, 6678 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    South Pacific Convergence Zone (SPCZ) d2Hdinosterol and calculated precipitation values (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, δD; 4alpha,23,24-Trimethyl-5alpha-cholest-22E-en-3beta-ol, δD, standard deviation; Age; Age, maximum/old; Age, minimum/young; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; dinosterol; Event label; GCUWI; Gravity corer, UWITEC; Holocene; Hydrogen isotopes; Isotope ratio mass spectrometry; Lac Lalolalo, 'Uvea, Wallis et Futuna; Lac Lanutavake, 'Uvea, Wallis et Futuna; Lake Emaotul, Efate, Vanuatu; Lake Lanotoo, Upolu, Samoa; lakes; Mean values; Median values; Method comment; Number of injections; Organic Geochemistry; paleohydrology; Paleolimnology; PCOR; Percussion corer; Precipitation; Precipitation, standard error; Section; Sedimentology; South Pacific Convergence Zone; SPCZ_Efate_VAN; SPCZ_Upolu_LAN; SPCZ_Uvea_LALOUC13; SPCZ_Uvea_LALOUC14; SPCZ_Uvea_LALOUC22; SPCZ_Uvea_LALOUC24; SPCZ_Uvea_LATVKUC1; SPCZ_Uvea_LATVKUC4; tropical Pacific
    Type: Dataset
    Format: text/tab-separated-values, 2781 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    South Pacific Convergence Zone (SPCZ) Titanium data (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: Age; Age, maximum/old; Age, minimum/young; Core; DEPTH, sediment/rock; dinosterol; Event label; GCUWI; Gravity corer, UWITEC; Holocene; Hydrogen isotopes; Lake Emaotul, Efate, Vanuatu; Lake Lanotoo, Upolu, Samoa; lakes; Mean values; Median values; Organic Geochemistry; paleohydrology; Paleolimnology; Sedimentology; South Pacific Convergence Zone; SPCZ_Efate_VAN; SPCZ_Upolu_LAN; Titanium, normalized; Titanium/incoherent radiation; tropical Pacific; X-ray fluorescence ITRAX core scanner
    Type: Dataset
    Format: text/tab-separated-values, 117199 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    South Pacific Convergence Zone (SPCZ) sediment core age models (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Keywords: AGE; Age, standard error; DEPTH, sediment/rock; dinosterol; Event label; GCUWI; Gravity corer, UWITEC; Holocene; Hydrogen isotopes; Laboratory code/label; Lac Lalolalo, 'Uvea, Wallis et Futuna; Lac Lanutavake, 'Uvea, Wallis et Futuna; Lake Emaotul, Efate, Vanuatu; Lake Lanotoo, Upolu, Samoa; lakes; Method comment; Organic Geochemistry; paleohydrology; Paleolimnology; PCOR; Percussion corer; rbacon calibration curve choice; Sedimentology; South Pacific Convergence Zone; SPCZ_Efate_VAN; SPCZ_Upolu_LAN; SPCZ_Uvea_LALOUC13; SPCZ_Uvea_LALOUC14; SPCZ_Uvea_LALOUC22; SPCZ_Uvea_LALOUC24; SPCZ_Uvea_LATVKUC1; tropical Pacific
    Type: Dataset
    Format: text/tab-separated-values, 536 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Contrasting Common Era climate and hydrology sensitivities from paired lake sediment dinosterol hydrogen isotope records in the South Pacific Convergence Zone (2022)
    PANGAEA
    Details
    Publication Date: 2024-05-21
    Description: Hydroclimate on 'Uvea (Wallis et Futuna) is controlled by rainfall associated with the South Pacific Convergence Zone (SPCZ), the southern hemisphere's largest precipitation feature. To extend the short observational precipitation record, the hydrogen isotopic composition of the algal lipid biomarker dinosterol (d2Hdinosterol) was measured in sediment cores from two volcanic crater lakes on 'Uvea. The modern lakes differ morphologically and chemically but both contain freshwater within the photic zone, support phytoplankton communities inclusive of dinosterol-producing dinoflagellates, and experience identical climate conditions. d2Hdinosterol values track lake water isotope ratios, ultimately controlled in the tropics by precipitation amount and evaporative enrichment. However, in 88-m-deep Lac Lalolalo a steadily decreasing trend in sedimentary d2Hdinosterol values from −227 ‰ around year 988 CE to modern values as low as −303 ‰, suggests this lake's evolution from an active volcanic setting to the present system strongly influenced d2Hdinosterol values. Although current hydrology and water isotope systematics may now reflect precipitation and evaporation in this lake, the interaction between these processes and large changes in basin morphology, geochemistry, and hydrology obstruct the recovery of a climate signal from Lac Lalolalo's sedimentary d2Hdinosterol records. This work emphasizes the importance of site replication and the use of complementary climate reconstruction tools, especially when using molecular proxies that may be sensitive to more than one environmental parameter. Contrary to its neighbor, duplicate d2Hdinosterol records from 23-m-deep Lac Lanutavake varied between −277 ‰ and −297 ‰ and indicate slightly drier conditions during the time-period known as the Medieval Climate Anomaly (MCA, 950 – 1250 CE). The d2Hdinosterol signal in Lac Lanutavake was muted compared to published records from 'Upolu (Samoa) and Efate (Vanuatu) indicating that 'Uvea's location is not as sensitive to precipitation variability at sites farther from the SPCZ central axis. Lithogenic runoff proxies combined with d2Hdinosterol support the interpretation of a relatively dry MCA on 'Uvea, 'Upolu, and Efate, potentially due to less intense precipitation, a contracted, or a more zonally oriented SPCZ.
    Keywords: dinosterol; Holocene; Hydrogen isotopes; lakes; Organic Geochemistry; paleohydrology; Paleolimnology; Sedimentology; South Pacific Convergence Zone; tropical Pacific
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Seawater carbonate chemistry and stable carbon isotope composition of DIC over a 27 + h period from Tetiaroa Atoll, French Polynesia (2024)
    PANGAEA
    Details
    Publication Date: 2024-06-15
    Description: In this pilot study, we use co-located semi-hourly measurements of total dissolved inorganic carbon (DIC), total alkalinity, and the stable carbon isotope composition of DIC (δ13CDIC) over a 27 + h period from Tetiaroa Atoll, French Polynesia, to investigate the potential for reef carbonate chemistry to record information related to benthic photosynthetic community composition and response to natural gradients in ambient acidity and dissolved carbon dioxide. This dataset is included in the OA-ICC data compilation maintained in the framework of the IAEA Ocean Acidification International Coordination Centre (see https://oa-icc.ipsl.fr). Original data were downloaded from Mendeley Data (see Source) by the OA-ICC data curator. In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2024) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2024-05-17.
    Keywords: Alkalinity, total; Aragonite saturation state; Benthos; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Entire community; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Isotopic fractionation factor; Isotopic fractionation factor, standard deviation; Local Time; Motu_Onetahi; OA-ICC; Ocean Acidification International Coordination Centre; Other studied parameter or process; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Rocky-shore community; Salinity; South Pacific; Temperature, water; Tropical; Type of study; δ13C, dissolved inorganic carbon
    Type: Dataset
    Format: text/tab-separated-values, 246 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Climate and oceanography of the Galapagos in the 21st century : expected changes and research needs (2021)
    In:  http://aquaticcommons.org/id/eprint/21476 | 18060 | 2017-06-19 20:57:34 | 21476 | Fundacion Charles Darwin Foundation
    Details
    Publication Date: 2021-07-14
    Description: With the likelihood that carbon dioxide and other greenhouse-gas levels in the atmosphere will continue to increase for the next decades, and that the planet as a whole will likely warm as a result, we expect the oceanography and climate of the Galapagos to change. Based on an analysis of observational studies and climate models, the main changes are likely to include higher sea-surface temperatures, continued El Niño and La Niña events, some of which will be intense, a rise in sea level of several cm, increased precipitation, lower surface ocean pH, and a reduction in upwelling. These changes will likely alter the marine and terrestrial ecosystems of the Galapagos in ways that are difficult to predict. Major uncertainties exist concerning the relationship between the expected regional changes in ocean temperatures, precipitation, upwelling and seawater pH that most climate models consider, and the local changes in the Galapagos Islands.
    Keywords: Atmospheric Sciences ; Ecology ; Oceanography ; global warming ; global climate change ; sea level rise ; El Niño Southern Oscillation ; ENSO ; precipitation ; ocean acidification ; upwelling
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 50-54
    Location Call Number Limitation Availability
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    PAPER (OA)
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