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Shear strength (handheld penetrometer) from IODP Hole 386-M0090B
No full textShear strength from handheld penetrometer of the above given hole of International Ocean Discovery Program (IODP) Expedition 386 (Japan Trench Paleoseismology). This dataset was obtained at the end of the core processing workflow during the third phase (Personal Sampling Party, PSP) of expedition 386, which took place between 2022-11-15 – 2022-11-30 onboard D/V Chikyu. Measurements were performed on the work halves of core sections using a handheld (pocket) penetrometer equipped with a 10 mm diameter tip. The tip was pushed 6.3 mm perpendicular to the split core surface with the measuring pin downward until the groove marked on the tip was even with the level of the core surface. The resulting resistance (compressive strength) was read from the device and used to calculate undrained shear strength. At each measurement depth, three measurements were conducted and the resulting undrained shear strength averaged. In the case of major discrepancies between the three measurements, the team verified the results by repeating the measurements.
For further methodological information see methods chapter in Strasser, M. et al., 2023 https://doi.org/10.14379/iodp.proc.386.102.202
Shear strength (handheld penetrometer) from IODP Hole 386-M0093B
No full textShear strength from handheld penetrometer of the above given hole of International Ocean Discovery Program (IODP) Expedition 386 (Japan Trench Paleoseismology). This dataset was obtained at the end of the core processing workflow during the third phase (Personal Sampling Party, PSP) of expedition 386, which took place between 2022-11-15 – 2022-11-30 onboard D/V Chikyu. Measurements were performed on the work halves of core sections using a handheld (pocket) penetrometer equipped with a 10 mm diameter tip. The tip was pushed 6.3 mm perpendicular to the split core surface with the measuring pin downward until the groove marked on the tip was even with the level of the core surface. The resulting resistance (compressive strength) was read from the device and used to calculate undrained shear strength. At each measurement depth, three measurements were conducted and the resulting undrained shear strength averaged. In the case of major discrepancies between the three measurements, the team verified the results by repeating the measurements.
For further methodological information see methods chapter in Strasser, M. et al., 2023 https://doi.org/10.14379/iodp.proc.386.102.202
Physical oceanography from mooring KPO_1179
No full textGEOMAR moorings are typically equipped with instruments recording pressure, temperature, conductivity, dissolved oxygen and current velocity. Instruments with pressure, temperature, conductivity and oxygen sensors were calibrated in situ immediately prior to and after a mooring deployment period by attaching them to the CTD frame during CTDO casts. Correction terms were then developed from the difference between the sensor readings and the calibrated CTDO data during several minute long calibration stops. These correction terms were then applied to the full deployment periods. This ensured best data quality with recognition of potential sensor drifts and also allowed for the estimation of calibration and measurement errors (Hahn et al. 2014, Bittig et al. 2018, Berx et al. 2019)
Labile and total particulate element digests from 16° and 17° S shelf transects during METEOR cruise M135
No full textLabile and total particulate trace metal concentrations were determined on particles collected from the water column of shelf sections at 16° and 17° S shelf transects on METEOR cruise M135. Samples were collected from the trace metal clean sampling system. Polyethersulfone membrane filters (Sartorius, 0.2 µm) and plastic holders (Swinnex, Nalgene) were pre-cleaned in 1 M HCl followed by de-ionized water, then mounted directly onto the OTE samplers in the trace metal clean laboratory on deck. About 4 L (exact volume recorded) of seawater was passed over the filters. Filters were then rinsed with a few drops of de-ionized water (<2 mL) and stored frozen at -20°C until analysis. Labile and total particulate digestions were conducted in series on the same filters. Filters were leached and digested in perfluoroalkoxy vials (Savillex). Labile particulate metals were determined following a 2-hour weak acid leach (25% by volume acetic acid, Optima grade, Fisher Scientific) with a mild reducing agent (0.02 M hydroxylamine hydrochloride, Sigma TM grade) and a short heating step (10 minutes at 90–95 °C). Total particulate metals were determined following a 15-hour reflux digest at 150°C using a mixture of hydrofluoric acid and nitric acid (50% and 10% by volume, respectively, Optima grade, Fisher Scientific). Metal concentrations were then determined via high resolution inductively coupled plasma-mass spectrometry with calibration via standard additions prepared in a sample-matched matrix
Sediment biogeochemistry and diatom assemblages in dated sediment core from lake Teremendo (Michoacán, Mexico)
No full textThis dataset comprises multiproxy biogeochemical data and diatom assemblage data for a sediment sequence (LTe22-1) from lake Teremendo (Michoacán, Mexico). The data were used to explore connections between lake carbon cycling and related ecosystem processes under natural and anthropogenic environmental change over the past four centuries. The sediment core (155 cm in length) was retrieved with a Uwitec corer near the middle of the lake basin (water depth ~8 m) in April 2022. After initial core scanning, the sediment core was sectioned at 5-mm intervals. The data are provided for these discrete sediment sections from 0 cm down to the depth of 46.5 cm, covering a time period from 2022 to around 1650. Age estimates for each sediment section have been calculated based on radiolead (Pb-210) dating of the surface sediment sections and four radiocarbon (C-14) measurements. Diatom data include taxa present with at least 0.5% relative abundance in any sample
Composite dry bulk density profile of sediment cores 340-TC1, 340-PC1, and 333-PC2 from Lake Baikal, Russia
No full textExploration behavior of Gasterosteus aculeatus F1 offspring in terms of time spent exploring and percent of arena explored depending on offspring heatwave treatment
No full textExploration behavior of F1 offspring in terms of time spent exploring (seconds) and percent of arena explored depending on offspring heatwave treatment
Foraminiferal δ18O from sediment core CAGE19-3-KH14-GPC02 (140-90 ka)
No full textThe dataset includes stable oxygen isotopes (δ18O) of Neogloboquadrina pachyderma, Oridorsalis umbonatus, and Cibicidoides wuellerstorfi from sediment core CAGE19-3-KH14-GPC02 in the eastern Fram Strait between 140
and 90 ka. The measurements were made with a Finnigan MAT253 mass spectrometer with an online Kiel IV
