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Sub-daily meteorological observations of wet bulb temperature for Birao, Central African Republic
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Species-specific foraminifera-bound nitrogen isotope and foraminiferal calcite oxygen and carbon isotope measurements from DSDP Site 516 in the South Atlantic over a glacial-interglacial cycle
No full textThis dataset contains species-specific foraminifera-bound nitrogen isotope (FB-δ15N) measurements from sediment core samples at Deep Sea Drilling Program Site 516, located in the subtropical South Atlantic gyre. Complementary species-specific carbon and oxygen stable isotope measurements were performed on foraminiferal shell carbonate, with additional size-specific carbon and oxygen isotope data collected for two samples. Isotopic measurements were conducted on the following foraminifera species: Trilobatus sacculifer, Globigerinoides ruber ruber, Globigerinoides ruber albus, Globorotalia truncatulinoides, Globigerinella siphonifera, and Globigerina bulloides.
The data span a full glacial-interglacial cycle and provide species-specific isotopic variability to evaluate foraminifera-bound nitrogen isotopes as a new tool to determine paleo-photosymbiosis in planktic foraminifera
Master tracks in different resolutions during POLAR 6 campaign P6-255_ANT_2024_2025
No full textRaw data acquired by GPS1 position sensors on board research aircraft Polar 6 during the campaign P6-255_ANT_2024_2025 were processed to receive a validated master track which can be used as reference of further expedition data. Novatel FlexPak6 GPS receiver was used as navigation sensors during the campaign. Data were downloaded from AWI Datamanagement System (https://dms.awi.de) with a resolution of 1 sec. Processed data are provided as a master track with 1 sec resolution and a generalized track with a reduced set of the most significant positions of the master track. A detailed report on processing is also available for each flight
Bulk organic matter δ13C, biomarker, and microfossil radiocarbon data of cores PS51/154-11 and PS51/159-10 from the Laptev Sea, Arctic Ocean
No full textThe data were obtained from cores PS51/154-11 (77.276000°N, 120.609833°W; 270 m) and PS51/159-10 (76.766667°N, 116.031667°W; 60 m) in the western Laptev Sea. Sediments were subsampled from the cores with 10 mL syringes in 5–10 cm intervals. The dataset includes: 1) stable carbon isotope ratio (δ13C) from bulk organic matter; 2) additional radiocarbon measurements on microfossils; and 3) biomarker indices, including the n-alkane based Carbon Preference Index (CPI), the Sphagnum proxy (C25/(C25+C29) ratio), the syringyl phenols to vanillyl phenols ratio (S/V), the cinnamyl phenols to vanillyl phenols ratio (C/V), the vanillic acid to vanillin ratio (Vd/Vl), and the mass accumulation rate of high molecular weight fatty acids (C24:0+C26:0+C28:0+C30:0, HMW fatty acid MAR)
IODP Site 363-U1486 age model model and biomarker records during the past 1.68 million years
No full textEnhanced Pacific meridional and zonal temperature gradients from ~2 to 1 million years ago (Ma) and the subsequent shift of glacial cycles in the Mid-Pleistocene Transition (MPT) from 1.2 to 0.7 Ma are remarkable in Pleistocene climate history. However, their influence on Indo-Pacific Warm Pool hydroclimate is unclear despite its global importance. Here we study the response of Papua New Guinea precipitation to changes in climate background conditions during these transitions using 1.68 million years of records of leaf wax deuterium and carbon isotopes, and pyrogenic polycyclic aromatic hydrocarbons from the Bismarck Sea. Dry climates dominate at peak interglacials through the ~1.7 My record, likely in response to higher CO2 and smaller continental ice sheets that shifted the tropical rain belt northward. Interglacial fire activity intensified at ~1.25 Ma, indicating an increased severity of droughts possibly due to intensification of El Niño events