cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.784177
title: (Table T2) Age vs. stable isotopes of planktic foraminifers for a spliced core of ODP Sites 184-1147 and 184-1148

description: Sediment depth is given in mcd. Specimens were chosen from the &gt;63 µm fraction. Isotope values adjusted after Shackleton et al. (1995, doi:10.2973/odp.proc.sr.138.117.1995). Note that the data is for a spliced section: Three advanced piston corer holes at ODP Site 184-1147 and two extended core barrel holes at ODP Site 184-1148 were cored and combined into a composite (spliced) stratigraphic section.
DOI: 10.1594/pangaea.223488
title: Stable isotope data of sediment core GeoB2125-1
DOI: 10.1594/pangaea.223491
title: Stable isotope data of sediment core GeoB2819-1
DOI: 10.1594/pangaea.223481
title: Stable isotope data of sediment core GeoB1501-4
DOI: 10.1594/pangaea.223489
title: Stable isotope data of sediment core GeoB2202-4
DOI: 10.1594/pangaea.713177
title: Globigerinoides ruber (white) isotopes of sediment core GeoB1903-3
DOI: 10.1594/pangaea.884583
title: Stable oxygen isotope record during Termination II in sediment core GL1090

description: This dataset was updated on 2018-09-17: column no 1 with sediment depth was added.
DOI: 10.1594/pangaea.705109
title: Stable isotope record of Cibicidoides wuellerstorfi of sediment core GeoB7920-2
DOI: 10.1594/pangaea.727745
title: Mg/Ca ratios of Globigerina bulloides and stable isotope data of ODP Hole 177-1092B in the Southern Ocean

description: The middle Miocene climate approximately 14 Ma ago was characterized by the glaciation of Antarctica, deep-ocean cooling and variations in the global carbon cycle. Although the Southern Ocean underwent significant oceanographic changes, there is limited information on their spatial extent and timing. However, such knowledge is crucial for understanding the role of the Southern Ocean and the Antarctic Circumpolar Current (ACC) for Antarctic glaciation and the coupling between the ocean and continental climate. We have reconstructed surface temperatures and seawater oxygen isotopes at Ocean Drilling Program (ODP) Site 1092 in the Polar Frontal Zone of the Atlantic sector of the Southern Ocean from foraminiferal oxygen isotopes (d18O) and magnesium to calcium ratios (Mg/Ca). Sea surface cooling by ~ 4 °C and freshening indicated by the ~ 1per mill reduction of seawater d18O (d18Osw) at 14.2 Ma precede the major step in Antarctic ice sheet growth at 13.8–13.9 Ma. This pattern qualitatively mirrors previous findings from the Pacific sector, and we interpret the surface hydrographic changes to reflect the circum-Antarctic northward shift of the Southern Ocean fronts and specifically at Site 1092 the passage of the Subantarctic Front. The magnitude of change in reconstructed d18Osw requires a d18Osw: salinity gradient significantly higher than the modern value (~ 0.52 per mill) and it possibly exceeded 1.1 per mill. This implies the Polar Frontal Zone was influenced by freshwater derived from Antarctica, which in turn confirms higher than modern continental precipitation. The latter has previously been suggested to have contributed to Antarctic glaciation.
description: DEPTH, sediment = mbsf, stable isotope data were originally generated by Paulsen (2005). AGE = tuned to Sites 1085 and 1146, modified by Kuhnert, Henning
description: Supplement to: Kuhnert, Henning; Bickert, Torsten; Paulsen, Harald (2009): Southern Ocean frontal system changes precede Antarctic ice sheet growth during the middle Miocene. Earth and Planetary Science Letters, 284(3-4), 630-638
DOI: 10.1594/pangaea.842176
title: Planktonic stable oxygen isotope record of IODP Site 306-U1314

description: Sediment depth is given in mcd, Age tuned to LR04 stack (Lisiecki and Raymo, 2005, doi:10.1029/2004PA001071)
DOI: 10.1594/pangaea.743255
title: (Fig. 12) Paleo-SST reconstructions in sediment core M39022-1
DOI: 10.1594/pangaea.762824
title: Stable oxygen isotope and Mg/Ca ratios of Globigerina bulloides in MIS 16 of IODP Hole 306-U1313A

description: Sediment depth (m) is amcd.
DOI: 10.1594/pangaea.895464
title: Benthic foramaminifera and stable isotope record of sediment core JM07-015
DOI: 10.1594/pangaea.831735
title: Oxygen and carbon isotopes of the benthic foraminifer Cibicoides wuellerstorfi of IODP Site 303-U1308

description: DEPTH, sediment/rock [m] is given in mcd.
DOI: 10.1594/pangaea.842416
title: (Table 2) Stable isotope composition of benthic foraminifera from surface sediments of the Kara Sea
DOI: 10.1594/pangaea.819213
title: Benthic foraminiferal stable oxygen isotope record of ODP Hole 121-758C

description: AGE [ka BP] tuned to LR04 stack.
DOI: 10.1594/pangaea.819249
title: (Table 8) Carbon and oxygen isotope values for foraminifera in sediment core AOS94_B08
DOI: 10.1594/pangaea.422433
title: Stable isotope analysis of bulk carbonate in surface sediments from Bunger Oasis
DOI: 10.1594/pangaea.713055
title: (Table DR4) Foraminiferal oxygen and carbon isotope data for DSDP Site 32-305

description: Benthic foraminifera include species of Nuttalides and Oridorsalis. All other species listed are planktic foraminifera. All other species listed are planktic foraminifera. Stable isotope data are expressed relative to the Vienna Peedee belemnite standard.
DOI: 10.1594/pangaea.605415
title: (Table 7) Isotope values measured in bottom water
DOI: 10.1594/pangaea.804371
title: (Table 3) Stable carbon and oxygen isotopic composition of ODP Site 164-996 carbonate precipitates and sediments
DOI: 10.1594/pangaea.742785
title: Stable carbon and oxygen isotopic compsoition of Globorotalia inflata of sediment core MD03-2699

description: Size fraction &gt;315 µm.
DOI: 10.1594/pangaea.931108
title: Benthic and planktic foraminiferal isotope data from ODP Site 184-1146
DOI: 10.1594/pangaea.141575
title: Paleotemperatures, stable isotopes and alkenones of samples from the South Atlantic
DOI: 10.1594/pangaea.711148
title: Results of δ¹⁸O and Mg/Ca analyses (Uvigerina bifurcata and Globorotalia inflata), and calculated Mg/Ca-T and local d18Oivc-sw of sediment core GeoB6211-2

description: Age: linear interpolation between calibrated 14C AMS control points
DOI: 10.1594/pangaea.320089
title: (Appendix 3) Stable oxygen isotope composition of planktic foraminifera at station GeoB3513-1 during fall
DOI: 10.1594/pangaea.726776
title: Stable isotope analyses of sediment core GeoB9508-5
DOI: 10.1594/pangaea.787053
title: (Table T3) Stable carbon isotope composition of methane in samples of ODP Hole 180-1108B
DOI: 10.1594/pangaea.803742
title: (Table 1) Concentration and isotopic composition of methane in PCS gas samples from ODP Leg 164 sites

description: Cores with sediment and gas from the gas hydrate reservoir on the Blake Ridge were recovered at near in situ pressure using the pressure core sampler (PCS) on Leg 164. Stepwise degassing of these cores and subsequent analyses of gas samples provide a unique data set concerning the in situ abundance and composition of gases in marine sediments. Carbon isotope analyses were conducted on CH4 from 90 of the gas samples to compare the isotopic composition of in situ CH4 with the isotopic composition of gas in sediments recovered by conventional coring procedures. Weighted averages of CH4 d13C values from PCS cores at Sites 995 and 997 are relatively constant at -65 per mil to 62 per mil PDB between 300 m below seafloor (mbsf) and the bottom of the holes (700-750 mbsf). These values indicate a microbial origin for the methane. The weighted averages of CH4 d13C values for PCS gas samples are comparable to those for gas recovered from voids in standard advanced piston (APC) and extended core barrel (XCB) cores recovered from similar depths. This demonstrates that d13C of CH4 in gas hydrate- and free gas-bearing sediments is not fractionated during degassing of normal cores, even though as much as 99.8% of the original CH4 in the sediments can be lost during core recovery. However, during degassing of a core inside of the PCS, anomalous methane d13C values are frequently observed for the first degassing step, which involves release of CH4-poor air that is trapped inside the PCS during deployment. Experiments on degassing of CH4-saturated water in a simple, sediment-free system analogous to the PCS demonstrates that carbon isotope fractionation of 1.5 per mil - 2 per mil between CH4 gas and dissolved CH4 can occur after large pressure drops if the system is not allowed to re-equilibrate. This fractionation effect is probably amplified during gas release from PCS core samples because gas must escape through fine-grained sediment. Kinetic fractionation of carbon isotopes likely accounts for some of the nonsystematic methane carbon isotopic variations that are observed during degassing of PCS cores.
description: Supplement to: Wallace, Paul J; Dickens, Gerald Roy; Paull, Charles K; Ussler, William III (2000): Effects of core retrieval and degassing on the carbon isotope composition of methane in gas hydrate- and free gas-bearing sediments from the Blake Ridge. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-12
DOI: 10.1594/pangaea.223482
title: Stable isotope data of sediment core GeoB1503-1
DOI: 10.1594/pangaea.871122
title: Stable oxygen isotope record of Globigerina bulloides of sediment core HER_MC_MR03_3
DOI: 10.1594/pangaea.771248
title: (Table 2) Mineralogy, stable isotopes, and mineral percentages of the carbonate fraction of samples from the South China Sea

description: Chemoherm carbonates, as well as numerous other types of methane seep carbonates, were discovered in 2004 along the passive margin of the northern South China Sea. Lithologically, the carbonates are micritic containing peloids, clasts and clam fragments. Some are highly brecciated with aragonite layers of varying thicknesses lining fractures and voids. Dissolution and replacement is common. Mineralogically, the carbonates are dominated by high magnesium calcites (HMC) and aragonite. Some HMCs with MgCO3 contents of between 30–38 mol%–extreme-HMC, occur in association with minor amounts of dolomite. All of the carbonates are strongly depleted in d13C, with a range from -35.7 to -57.5 per mil PDB and enriched in d18O (+ 4.0 to + 5.3 per mil PDB). Abundant microbial rods and filaments were recognized within the carbonate matrix as well as aragonite cements, likely fossils of chemosynthetic microbes involved in carbonate formation. The microbial structures are intimately associated with mineral grains. Some carbonate mineral grains resemble microbes. The isotope characteristics, the fabrics, the microbial structure, and the mineralogies are diagnostic of carbonates derived from anaerobic oxidation of methane mediated by microbes. From the succession of HMCs, extreme-HMC, and dolomite in layered tubular carbonates, combined with the presence of microbial structure and diagenetic fabric, we suggest that extreme-HMC may eventually transform into dolomites. Our results add to the worldwide record of seep carbonates and establish for the first time the exact locations and seafloor morphology where such carbonates formed in the South China Sea. Characteristics of the complex fabric demonstrate how seep carbonates may be used as archives recording multiple fluid regimes, dissolution, and early transformation events.
description: Supplement to: Han, Xiqiu; Suess, Erwin; Huang, Yong-Jiang; Wu, Nengyou; Bohrmann, Gerhard; Su, Xin; Eisenhauer, Anton; Rehder, Gregor; Fang, Yinxia (2008): Jiulong Methane Reef: Microbial mediation seep-carbonates in the South China Sea. Marine Geology, 249(3-4), 243-256
DOI: 10.1594/pangaea.787057
title: (Table T2) Isotope composition of interstitial waters from ODP Leg 180 sites
DOI: 10.1594/pangaea.843934
title: Chemical composition of Holocene sediment core M40/4_SL71 from the Eastern Mediterranean Sea
DOI: 10.1594/pangaea.757305
title: (Figure 4) Distribution of radioactivity in the sediment slurries of Lake Plußsee during incubation with H2, bicarbonate and H235S

description: Timezero values were measured two hours after addition of radiotracer. AVS: acid volatile sulfide (H2S + FeS); CRS: chromium reducible sulfur (S0 + FeS2). The dissolved 35S was measured from filtered slurry supernatant. The trapped 35S was interpreted to represent labeled dimethyl sulfide. Error bars represent ±1 standard error of duplicate bottles.
DOI: 10.1594/pangaea.713180
title: Globigerinoides ruber (white) isotopes of sediment core GeoB3801-6
DOI: 10.1594/pangaea.788198
title: (Table T1) Stable isotope ratios of the benthic foraminifer Nuttallides truempyi from ODP Hole 171B-1051B sediments
DOI: 10.1594/pangaea.974135
title: Sediment echosounder raw data (Atlas Parasound P70 echosounder entire dataset) of RV MARIA S. MERIAN during cruise MSM125

description: Sediment echosounder data using Atlas Parasound P70 echosounder was recorded during MARIA S. MERIAN cruise MSM125. The expedition took place during 30.01.2024 - 06.02.2024 from Algeciras (Spain) to Funchal (Portugal) in the Northern Atlantic. Data were recorded in the Moroccan and Portuguese EEZs and outside. MSM125 was a short cruise of only four working days to test deep-sea research devices developed at MARUM at the University of Bremen and the Max Planck Institute for Marine Microbiology, Bremen (MPIMM), as part of the Cluster of Excellence The Ocean Floor - Earth's Uncharted Interface in in-situ operation so that they can be used in future research expeditions. During the cruise, the hull-mounted parametric sub-bottom profiler ATLAS PARASOUND P70 was used to conduct information about the sediment sub-surface and water column. Its function is based on the parametric effect of the non-linear relation of pressure and density during sonar propagation. The system utilizes two high-intensity waves with frequencies of 18-20 kHz (primary high frequency; PHF) and 22-24 kHz to create a secondary high (about 40-42 kHz) and secondary low frequency (SLF) of about 4 kHz. The SLF can record sub-bottom structures, whereas the PHF can image the water column and potential gas bubbles, plankton, fish or nepheloid layers within. The transducer array has an opening angle of 4° by 5°, which corresponds to a footprint size of about 7% of the water depth. Data acquisition was performed using measured real-time values of surface sound velocity and a static sound velocity profile of 1500 m/s. Using the software ATLAS PARASTORE, data was displayed and stored as raw *.asd files and additional *.ps3 and auxiliary files for certain depth windows. The sub-bottom profiler was operating almost continuously with a desired frequency of 4 kHz for SLF and a desired frequency of 18 kHz for PHF.
DOI: 10.1594/pangaea.974586
title: Sediment echosounder processed data (Atlas Parasound P70 echosounder entire dataset, PS3 format converted to SEG-Y format) of RV MARIA S. MERIAN during cruise MSM125

description: Sediment echosounder data using Atlas Parasound P70 echosounder was recorded during MARIA S. MERIAN cruise MSM125. The expedition took place during 30.01.2024 - 06.02.2024 from Algeciras (Spain) to Funchal (Portugal) in the Northern Atlantic. Data were recorded in the Moroccan and Portuguese EEZs and outside. MSM125 was a short cruise of only four working days to test deep-sea research devices developed at MARUM at the University of Bremen and the Max Planck Institute for Marine Microbiology, Bremen (MPIMM), as part of the Cluster of Excellence The Ocean Floor - Earth's Uncharted Interface in in-situ operation so that they can be used in future research expeditions. During the cruise, the hull-mounted parametric sub-bottom profiler ATLAS PARASOUND P70 was used to conduct information about the sediment sub-surface and water column. Its function is based on the parametric effect of the non-linear relation of pressure and density during sonar propagation. The system utilizes two high-intensity waves with frequencies of 18-20 kHz (primary high frequency; PHF) and 22-24 kHz to create a secondary high (about 40-42 kHz) and secondary low frequency (SLF) of about 4 kHz. The SLF can record sub-bottom structures, whereas the PHF can image the water column and potential gas bubbles, plankton, fish or nepheloid layers within. The transducer array has an opening angle of 4° by 5°, which corresponds to a footprint size of about 7% of the water depth. Data acquisition was performed using measured real-time values of surface sound velocity and a static sound velocity profile of 1500 m/s. The *.ps3 files of the corresponding raw dataset https://doi.org/10.1594/PANGAEA.974135 were utilized for conversion to SEG-Y format and further processing (generating slices, UTM conversion) using the software PS32SGY (Version 2022.01, developed by H. Keil, MTU-Geoscience department, University of Bremen). The files can be imported into The Kingdom Suite software. The sub-bottom profiler was operating almost continuously with a desired frequency of 4 kHz for SLF and a desired frequency of 18 kHz for PHF.
DOI: 10.1594/pangaea.527916
title: Benthic foraminifera assemblages and stable isotopes of sediment core PS1290-4
DOI: 10.1594/pangaea.783551
title: (Table T1) Carbon and oxygen isotope ratios of authigenic carbonates from ODP Site 186-1150 and Hole 186-1151A
DOI: 10.1594/pangaea.784176
title: (Table T1) Oxygen and carbon isotope ratios of planktic foraminifers from ODP Sites 184-1147 and 184-1148

description: DEPTH, sediment is given in mbsf. Specimens were chosen from the &gt;63 µm fraction. Adjustment factors after Shackleton et al. (1995, doi:10.2973/odp.proc.sr.138.117.1995).
DOI: 10.1594/pangaea.897970
title: Oxygen isotope composition of Globigerinoides ruber of sediment core GS07-150-10/3MC-B
DOI: 10.1594/pangaea.327243
title: Deglacial-Holocene records of central African climate and SST in the tropical Atlantik of sediment core GeoB6518-1

description: Age is given in calendar years.
DOI: 10.1594/pangaea.713181
title: Globigerinoides ruber (white) isotopes of sediment core GeoB3813-3
DOI: 10.1594/pangaea.880119
title: Leaf-waxes hydrogen isotopic composition of sediment core GeoB4905-4

description: The rapidity and synchrony of the African Humid Period (AHP) termination at around 5.5 ka are debated, and it is unclear what caused a rapid hydroclimate response. Here we analyzed the hydrogen isotopic composition of sedimentary leaf-waxes (dDwax) from the Gulf of Guinea, a proxy for regional precipitation in Cameroon and the central Sahel-Sahara. Our record indicates high precipitation during the AHP followed by a rapid decrease at 5.8-4.7 ka. The similarity with a dDwax record from northern East Africa suggests a large-scale atmospheric mechanism. We show that northern high- and mid-latitude cooling weakened the Tropical Easterly Jet and, through feedbacks, strengthened the African Easterly Jet. The associated decrease in precipitation triggered the AHP termination and combined with biogeophysical feedbacks to result in aridification. Our findings suggest that extratropical temperature changes, albeit smaller than during the glacial and deglacial, were important in triggering rapid African aridification during the Holocene.
description: Supplement to: Collins, James A; Prange, Matthias; Caley, Thibaut; Gimeno, Luis; Beckmann, Britta; Mulitza, Stefan; Skonieczny, Charlotte; Roche, Didier M; Schefuß, Enno (2017): Rapid termination of the African Humid Period triggered by northern high-latitude cooling. Nature Communications, 8(1)
DOI: 10.1594/pangaea.706926
title: (Table 2) Chemical composition of terrigenous material from sediment core TT013_18
DOI: 10.1594/pangaea.223484
title: Stable isotope data of sediment core GeoB1701-4
DOI: 10.1594/pangaea.54705
title: Globigerinoides ruber (white) isotopes of sediment core GeoB1105-4
DOI: 10.1594/pangaea.842213
title: Stable carbon isotopes from bulk carbonates, MI, and the distribution of different GDGTs for sediment Core 10
DOI: 10.1594/pangaea.837615
title: Stable isotopes of carbonates from the Blue Clay Formation at Ras il-Pellegrin
DOI: 10.1594/pangaea.945702
title: Canadian Arctic Archipelago Rivers Program: Nutrient, Dissolved Organic Carbon, and Water Isotope Data 2016-2019

description: This data set describes the stable water isotope (δ18O-H2O, δ2H-H2O), Dissolved Organic Carbon (DOC), and Nutrient (Nitrate + Nitrite, Phosphate, Silicate) data collected from 53 rivers, lakes, and glaciers throughout the Canadian Arctic Archipelago (CAA) and Hudson Bay as part of the Canadian Arctic Archipelago Rivers Program (CAA-RP; 2016 – 2019); ArcticNet / Amundsen Science biogeochemical surveys (2017-2019); the Canada 150 C3 Expedition (2017); and the BaySys project (2018). Water samples were collected according to methods developed by the Arctic Great Rivers Observatory (http://www.arcticgreatrivers.org/), described in detail in Brown et al., 2020. Water collected for stable water isotope, DOC, and Nutrient analyses was filtered through 0.22 μm Sterivex cartridges (Millipore) into triply rinsed glass (isotopes) or HDPE (Nutrients, DOC) vials; HDPE vials were acid cleaned prior to use. Samples for the determination of DOC and Nutrients were frozen until analyses, whereas stable isotope samples were stored in the dark at room temperature or refrigerated until analyses. Analytical methods are described in the accompanying metadata file. Where indicated, water Temperature and Conductivity at the time of sampling were determined as described in the dataset metadata file.
description: Acknowledgments:This sampling program would not be possible without the help of many enthusiastic and supportive partners who have carried sampling kits with them across the CAA! Many thanks go to the Captain and Crew of the CCGS Amundsen, the Captain and Crew of the RV Martin Bergmann, the Captain Crew of the MV Polar Prince, and the staff at the Canadian High Arctic Research Station, as well as Austin Maniyogina, Amanda Dumond, Patrick Duke, Shawn Marriott, Francis Emingak, Araleigh Cranch, Richard Sims, Peter Van Buren, Geraint Element, Kathleen Munson, Mohamed Ahmed, Kate Yezhova, ArcticNet, Amundsen Science, Adrian Schimnowski, Tara Mascarenhas, Mark Graham, Eddy Carmack, Mike Dempsey, and Baba Pedersen for sample collection and logistical assistance, as well as Sarah-Ann Quesnel, Cynthia Wright, Owen Cowling, Joseph Orchardo, Gretchen Swarr, Jean-Eric Tremblay, Jonathan Gagnon, Gabriele Deslongchamps, Helmuth Thomas, Monica Nelson, Tonya Burgers, Jacoba Mol, and Araleigh Cranch for assistance with laboratory analyses. The Canadian Arctic Archipelago Rivers Program was supported by the Department of Fisheries and Oceans Canada, the Woods Hole Oceanographic Institution Coastal Ocean Institute, the Arctic Research Foundation, and Polar Knowledge Canada.
DOI: 10.1594/pangaea.320092
title: (Appendix 2) Stable oxygen isotope composition of planktic foraminifera at station GeoB4010-1 during winter
DOI: 10.1594/pangaea.758620
title: Chemical composition of Holocene sediment core M51/3_569-3 from the Eastern Mediterranean Sea

description: Age (kyr BP) is linear interpolated from S1 sapropel base, top (9.8 kyr, 5.7 kyr; de Lange et al., 2008, doi:10.1038/ngeo283) and recent sediment surface.
DOI: 10.1594/pangaea.742790
title: Stable carbon and oxygen isotopic composition of Cibicidoides wuellerstorfi of sediment core MD01-2446

description: Size fraction &gt;315 µm.
DOI: 10.1594/pangaea.855373
title: Stable isotope ratios of Cibicidoides wuellerstorfi of sediment core RC16-84
DOI: 10.1594/pangaea.67481
title: Stable isotope data of ODP Hole 154-926A (Table A3)
DOI: 10.1594/pangaea.743248
title: (Table 3) Concentrations and δ¹³C values of selected compounds from diverse source organisms as well as concentrations of compound classes of sample A-2 at station GeoB9908-1
DOI: 10.1594/pangaea.320087
title: (Appendix 3) Stable oxygen isotope composition of planktic foraminifera at station GeoB3508-1 during fall
DOI: 10.1594/pangaea.708289
title: (Table 7) δ¹³C values of n-alkanes extracted from sediment samples of ODP Hole 116-717C
DOI: 10.1594/pangaea.711225
title: (Table 4) Isotopic compositions of samples from ODP Hole 107-650A, Sediment type