cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.901011
title: Bacterial GMGTs in East African lake sediments: Their potential as palaeotemperature indicators

description: Glycerol monoalkyl glycerol tetraethers (GMGTs) are a group of membrane spanning lipids produced by some species of archaea and bacteria. They differ from the more commonly studied glycerol dialkyl glycerol tetraethers (GDGTs) in having an additional covalent carbon-carbon bond connecting the two alkyl chain. The relative abundance and distribution of bacterial branched GMGTs (brGMGTs) in surface sediments from a set of East African lakes were studied. The abundance of brGMGTs relative to the brGDGTs is positively correlated to measured mean annual air temperature (MAAT), although with a significant amount of scatter. BrGMGT abundance was not correlated to lake water pH. Seven major brGMGTs that vary in degree of methylation were identified, with m/z 1020, 1034 and 1048. Further, the mass chromatograms of the m/z 1020 and 1034 brGMGTs show an interesting distribution of peaks, which likely relates to the occurrence of distinct brGMGT isomers. This structural complexity is higher than previously observed in peats and marine sediments. Principal component analysis of the fractional abundance of bacterial tetraether lipids revealed the brGMGTs behave similarly to one another but differently from both the 5- or 6-methyl brGDGTs. This suggests the brGMGTs are produced by a common source organism and are methylated at a different position. The distribution of the seven brGMGTs showed considerable correlation with MAAT. This variability was captured in a new proxy index (the brGMGTI), which showed a strong positive linear relationship with MAAT. Lacustrine brGMGTs show potential to be applied to ancient settings to provide information about paleoclimate.
description: Supplement to: Baxter, Allix J; Hopmans, Ellen C; Russell, James M; Sinninghe Damsté, Jaap S (2019): Bacterial GMGTs in East African lake sediments: Their potential as palaeotemperature indicators. Geochimica et Cosmochimica Acta, 259, 155-169
DOI: 10.1594/pangaea.826933
title: Geochemistry of sediment core Samoylov_Island_2011/07
DOI: 10.1594/pangaea.904986
title: Relative paleointensity proxy of sediment core JR298-PC732
DOI: 10.1594/pangaea.901906
title: Thermomagnetic group and Characteristic remanent magnetisation (ChRM) of core P36, UN1, UN2 and B1-06 from the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.826935
title: Geochemistry of sediment core Samoylov_Island_2011/09
DOI: 10.1594/pangaea.940791
title: Amino acids and hexosamines of sediment samples from different oceanic areas between 1987 and 2015 from shelf seas to the deep ocean

description: This large set of sediment samples was collected in different oceanic areas between 1987 and 2015 from shelf seas to the deep ocean. The samples were compiled from previous studies and consist of surface sediments and sediment cores. Data are used for statistical analyses in order to better understand particle dynamics and early diagenetic processes in sediments and furthermore to test and refine amino acid (AA) and hexosamine (HA) based biogeochemical indicators. Samples were analysed for total nitrogen (N) using a Carlo Erba nitrogen analyser 1500. Total organic carbon (TOC) was measured with the same instrument after treatment of weighed samples with 1N HCl to remove carbonate. Stable nitrogen isotopes of total particulate nitrogen (δ15N-TPN) were analysed with the mass spectrometer Thermo Finnigan MAT 252. AA and HA contents and their individual monomers were analysed by liquid chromatography using a Biochrom 30 amino acid analyzer. Contents of AA and HA are presented in nmol/g and µg/g. AAC, AAN, HAC, HAN are presented in µg/g and as percentages of TOC (AAC/C, HAC/C) or TN (AAN/N, HAN/N). AA and HA monomers are presented in Mol% and comprise aspartic acid (ASP), glutamic acid (Glu), threonine (Thr), serine (Ser), glycine (Gly), alanine (Ala), valine (Val), methionine (Met), isoleucine (Ile), leucine (Leu), tyrosine (Tyr), phenylalanine (Phe), β-Alanine (β-Ala), γ-aminobutyric acid (γ-Aba), histidine (His), ornithine (Orn), lysine (Lys) and arginine (Arg), glucosamine (Gluam) and galactosamine (Galam). Cysteic acid (CYA), taurine (TAU), methionine sulfoximine (MSO) and tryptophane (TRP) were determined only in the more recent samples. Data gaps indicate that measurements were not carried out or that they were not stored in the older data sets. The RI was calculated according to Jennerjahn and Ittekkot (1997; https://archimer.ifremer.fr/doc/00093/20403/) and the DI after Dauwe et al. (1999; doi:10.4319/lo.1999.44.7.1809). Definitions of biogeochemical indicators SDI, RTI, ox/anox and a detailed description of the methods can be found in Gaye et al. (2022).
DOI: 10.1594/pangaea.826945
title: Geochemistry of sediment core Samoylov_Island_2011/22
DOI: 10.1594/pangaea.826931
title: Geochemistry of sediment core Samoylov_Island_2011/04
DOI: 10.1594/pangaea.826930
title: Geochemistry of sediment core Samoylov_Island_2011/03
DOI: 10.1594/pangaea.826932
title: Geochemistry of sediment core Samoylov_Island_2011/05
DOI: 10.15468/dl.4ptsca
title: Occurrence Download

description: A dataset containing 1556 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasGeospatialIssue is false",
 "HasCoordinate is true",
 "TaxonKey is one of (Anaxyrus canorus (Camp, 1916))"
 ]
}

 The dataset includes 1556 records from 15 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024320-250127130748423/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.1594/pangaea.921004
title: Analysis of Seagrass (Angiosperm) biomass during the wet and dry season in San Andres, Colombia
DOI: 10.1594/pangaea.826953
title: Geochemistry of sediment core Samoylov_Island_2011/31
DOI: 10.1594/pangaea.921006
title: Depth stations of Seagrass (Angiosperm) carbon and biomass analysis in San Andres, Colombia
DOI: 10.1594/pangaea.933699
title: Smear slide grain counts from IODP Site 323-U1342

description: Here we present new grain count data from from Integrated Ocean Drilling Program (IODP) Expedition 323 Site U1342 Holes A, C, and D. New records of sediment composition from laminated and non-laminated were determined from smear slide (quantitative grain counts) and particle size analyses. A subset of samples from three laminated intervals (672-697 ka, 826-836 ka, and 847-851 ka) and four adjacent massive intervals (668-671 ka, 822-825 ka, 803-845 ka, and 853-856 ka) were selected for analyses. Sediment smear slides were examined with a transmitted light petrographic microscope equipped with a standard eyepiece micrometer. Biogenic (pennate and centric diatoms, silicoflagellates, sponge spicules, foraminifers, and coccolithophores), mineral (clay minerals, silt- to sand-size siliciclastics), and volcaniclastic components were identified and their percentage abundances were visually determined under a petrographic microscope using a 40X objective and 10X eyepiece. For each sample, 3 counts were done on different parts of a smear slide using a random walk, and the average value of the 3 counts was used. Particle size analyses on the same samples were carried out with a Beckman-Coulter LS 13 320 laser particle size analyzer (LPSA) attached to an aqueous module equipped with a pump and a built-in ultrasound unit. Size distributions were analyzed from 0.04 µm to 2 mm. Measurements of such a wide particle size range are possible because the particle sizer is composed of two units: a laser beam for conventional (Fraunhofer) diffraction (from 0.4 µm to 2 mm) and a polarized intensity differential scatter (PIDS) unit, which measures particles based on the Mie theory of light scattering (0.04 µm). The samples for the analyses were subsampled and dispersed in the deionized water of the aqueous module of the particle sizer until obscuration values of 10%–15% and PIDS obscuration values of 48%–52% were obtained. The optical model chosen for the grain size determination is the default Fraunhofer model, based on the Fraunhofer theory of light scattering. Data interpolation and statistical analyses were calculated with the laser particle sizer proprietary software (56). Because all samples analyzed tend to log-normal grain size distributions in the 0.04 µm to 2 mm spectrum, geometric rather than arithmetic statistics were applied to the values obtained by the logarithmically spaced size channels of the particle sizer. Smear slide analyses show that laminated sediments contain significantly more diatomaceous biogenic material relative to siliciclastic grains. Laminated samples contain a higher percentage of total diatoms compared to non-laminated samples (72 versus 30%) and a higher percentage of well-preserved (i.e. whole, non-fragmented) diatoms (29 versus 9%), indicative of a high siliceous flux rate. Laminated sediments also display higher proportions of other biogenic particles (including silicoflagellates, sponge spicules, foraminifera, and coccolithophores).
DOI: 10.1594/pangaea.615251
title: Soil distribution and classification of sediment core Samoylov_Island_4
DOI: 10.1594/pangaea.904975
title: Age-depth model of sediment core JR298-PC728
DOI: 10.1594/pangaea.901738
title: Long chain n-alkanes of sediment core GeoB9528-3
DOI: 10.1594/pangaea.615250
title: Soil distribution and classification of sediment core Samoylov_Island_2
DOI: 10.1594/pangaea.826948
title: Geochemistry of sediment core Samoylov_Island_2011/25
DOI: 10.1594/pangaea.826939
title: Geochemistry of sediment core Samoylov_Island_2011/16
DOI: 10.1594/pangaea.901895
title: Magnetic susceptibility measurements of core P36, Ludwigshafen, from the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.904988
title: Stable oxygen isotope of Neogloboquadrina pachyderma of sediment core JR298-PC726
DOI: 10.1594/pangaea.904989
title: Stable oxygen isotope of Neogloboquadrina pachyderma of sediment core JR298-PC728
DOI: 10.1594/pangaea.810452
title: Physical oceanography during HEINCKE cruise HE387
DOI: 10.1594/pangaea.904980
title: Declination, inclination and maximum angular deviation of sediment core JR298-PC728
DOI: 10.1594/pangaea.930418
title: Polycyclic aromatic hydrocarbons data in sediments from the Canadian Arctic Archipelago

description: Within the context of climate change, the Arctic is undergoing major perturbations: because the summer sea ice extent is rapidly decreasing, leading to a seasonally ice-free Arctic Ocean, it has been speculated that maritime traffic could increase within the Canadian Arctic Archipelago (CAA); for example, the northwest passage could open to cargo transportation for a longer time period each year by the mid-century. However, maritime traffic and oil exploration within the Arctic could also increase the anthropogenic pressure and pollution load in Arctic ecosystems. Knowing that PAHs are pollutants of interest that could be released by natural and anthropogenic activities, a total of 23 PAHs (16 parent and 7 alkylated PAHs) were analyzed in sediment samples: 113 marine surface sediment samples and 13 terrestrial sediment samples collected from glaciers and rivers. Additionally, 8 push cores were subsampled to determine temporal trends. All samples were retrieved from box cores collected between 2016 and 2019 during the ArcticNet summer expeditions onboard the Canadian Coast Guard Ship (CCGS) icebreaker Amundsen. Samples were collected from glaciers and rivers using the ship helicopter as CCGS Amundsen traveled through the Canadian Arctic Archipelago. Surface sediments (uppermost 0.5 to 1 cm) were collected with a spoon and stored in plastic bags (WhirlPack) at 4°C until further analysis. Push cores were collected by pushing a plexiglass tube (10-cm diameter) into sediments. The cores were stored at 4°C until further subsampling. Sediment subsamples were retrieved from the push cores from 0 to 10 cm at 1-cm intervals. The data set includes: sample locations, PAHs content (23 PAHs) in every sample, ratio results and PCA results.
description: Supplement to: Corminboeuf, Anne; Montero-Serrano, Jean-Carlos; St-Louis, Richard (2021): Spatial and temporal distributions of polycyclic aromatic hydrocarbons in sediments from the Canadian Arctic Archipelago. Marine Pollution Bulletin, 171, 112729
DOI: 10.1594/pangaea.904979
title: Declination, inclination and maximum angular deviation of sediment core JR298-PC727
DOI: 10.1594/pangaea.905462
title: Holocene temperature reconstructions for northeastern North America and the northwestern Atlantic, core 09-FTL-SC2 (Fishtote lake)
DOI: 10.1594/pangaea.809904
title: Physical oceanography during HEINCKE cruise HE386
DOI: 10.1594/pangaea.810457
title: Physical oceanography during HEINCKE cruise HE398
DOI: 10.1594/pangaea.615248
title: Soil distribution and classification of sediment core Samoylov_Island_1 (apex)
DOI: 10.1594/pangaea.939693
title: Haemelsee: late-glacial pollen counts

description: This dataset provides the raw pollen counts for the late-glacial sediment sequence retrieved from Lake Haemelsee (Germany) in 2013. The counts are presented against both depth (cm core depth) and time (cal. yr BP) and cover the time interval from ca 15.200 to 10.400 cal yr BP. A total of 106 samples were counted, with higher sampling resolution around the onset and end of the Younger Dryas, and lower sampling resolution elsewhere in the core. The pollen record provides information about both regional vegetation change as well as changes in the within-lake flora. It was produced to inform on the exact age and duration of major palynological transitions during the late-glacial Cores were retrieved from the lake using a 3-m long UWITEC piston corer deployed from a floating coring platform during field work in July 2013. Volumetric samples were obtained from splits of the core and processed in the laboratory (University of Amsterdam, the Netherlands) using standard protocols.
DOI: 10.1594/pangaea.826938
title: Geochemistry of sediment core Samoylov_Island_2011/15
DOI: 10.1594/pangaea.923639
title: Minor and trace elements in sediment sampled across the Permian-Triassic boundary exposed at Festningen, Spitzbergen

description: The data table lists the concentrations of 44 minor and trace elements in 124 samples of sediment, collected approximately every few centimeters in a continuous profile across the Permian-Triassic boundary exposed at Festningen, Spitzbergen. The age of these sediments is approximately 251 Ma, and the period of time represented within the sediment profile is about 1 million years. Trace element concentrations in untreated bulk sediment samples were measured using quadrupole inductively coupled plasma mass spectrometry. The purpose of the study was to investigate how trace element concentrations of sediments change across the Late Permian Extinction and the Permian – Triassic Boundary, and to evaluate trace element concentrations as a proxy for massive volcanism in Siberia at that time.
description: Trace element data for 12 analyses of the international rock standard BHVO2 measured together with samples during the analysis period. Data is shown in last row.
DOI: 10.1594/pangaea.904976
title: Age-depth model of sediment core JR298-PC732
DOI: 10.1594/pangaea.904978
title: Declination, inclination and maximum angular deviation of sediment core JR298-PC726
DOI: 10.15468/dl.me89ju
title: Occurrence Download

description: A dataset containing 14881 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is one of (Specimen, Human Observation)",
 "OccurrenceStatus is Present",
 "TaxonKey is Phrynosoma cornutum (Harlan, 1825)"
 ]
}

 The dataset includes 14881 records from 120 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024321-250127130748423/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.1594/pangaea.904977
title: Age-depth model of sediment core JR298-PC736
DOI: 10.1594/pangaea.904981
title: Declination, inclination and maximum angular deviation of sediment core JR298-PC732
DOI: 10.1594/pangaea.904982
title: Declination, inclination and maximum angular deviation of sediment core JR298-PC734
DOI: 10.1594/pangaea.904983
title: Declination, inclination and maximum angular deviation of sediment core JR298-PC736
DOI: 10.1594/pangaea.904985
title: Relative paleointensity proxy of sediment core JR298-PC728
DOI: 10.1594/pangaea.904987
title: Relative paleointensity proxy of sediment core JR298-PC736
DOI: 10.1594/pangaea.901912
title: Chromium/Iron and Titanium/Iron ratio of core P36, Ludwigshafen, from the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.826950
title: Geochemistry of sediment core Samoylov_Island_2011/27
DOI: 10.1594/pangaea.904990
title: Stable oxygen isotope of Neogloboquadrina pachyderma of sediment core JR298-PC736
DOI: 10.1594/pangaea.615354
title: Documentation of sediment profile LD98-D10
DOI: 10.1594/pangaea.826940
title: Geochemistry of sediment core Samoylov_Island_2011/17
DOI: 10.1594/pangaea.826946
title: Geochemistry of sediment core Samoylov_Island_2011/23
DOI: 10.1594/pangaea.826956
title: Geochemistry of sediment core Samoylov_Island_2011/35
DOI: 10.1594/pangaea.826947
title: Geochemistry of sediment core Samoylov_Island_2011/24
DOI: 10.1594/pangaea.826949
title: Geochemistry of sediment core Samoylov_Island_2011/26
DOI: 10.1594/pangaea.826937
title: Geochemistry of sediment core Samoylov_Island_2011/12
DOI: 10.1594/pangaea.826941
title: Geochemistry of sediment core Samoylov_Island_2011/18
DOI: 10.1594/pangaea.905463
title: Holocene temperature reconstructions for northeastern North America and the northwestern Atlantic, core 08-NOR-3 (North lake)
DOI: 10.1594/pangaea.826934
title: Geochemistry of sediment core Samoylov_Island_2011/08
DOI: 10.1594/pangaea.826955
title: Geochemistry of sediment core Samoylov_Island_2011/33
DOI: 10.1594/pangaea.960354
title: Clay mineralogy of sediment core KL11
DOI: 10.1594/pangaea.960355
title: Carbonate chemistry of sediment core KL11
DOI: 10.1594/pangaea.960356
title: Grain size distribution of sediment core KL11
DOI: 10.1594/pangaea.960358
title: Nd and Sr isotopes of sediment core KL11
DOI: 10.1594/pangaea.960359
title: XRF geochemistry of sediment core KL11
DOI: 10.1594/pangaea.912698
title: Archaeobotanical data from the Middle Yayoi culture layers of the 2018 survey sections 2 and 3 of the Maenakanishi site, central Japan

description: This data set contains absolute counts of carbonised seeds of wild and cultivated plants and rice chaffs as well as floated litres of sediment per sample from the Middle Yayoi culture layers of the 2018 survey sections 2 and 3 of the Maenakanishi site (Kumagaya City, Saitama Prefecture, Japan). The analysed sediment samples represent ten hearths deposits collected during archaeological excavation from eight different house pits that were treated by bucket flotation to extract carbonised plant remains. The derived samples were analysed using a stereo microscope.
DOI: 10.1594/pangaea.901893
title: Coercivity components from different cores of the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.128987
title: Heavy minerals from sediments at Samoylov Island, Lena Delta
DOI: 10.1594/pangaea.826943
title: Geochemistry of sediment core Samoylov_Island_2011/20
DOI: 10.1594/pangaea.826944
title: Geochemistry of sediment core Samoylov_Island_2011/21
DOI: 10.15468/dl.qkrz9t
title: Occurrence Download

description: A dataset containing 11262 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasGeospatialIssue is false",
 "HasCoordinate is true",
 "TaxonKey is one of (Anaxyrus cognatus (Say, 1822))"
 ]
}

 The dataset includes 11262 records from 71 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024322-250127130748423/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.1594/pangaea.826951
title: Geochemistry of sediment core Samoylov_Island_2011/28
DOI: 10.1594/pangaea.826952
title: Geochemistry of sediment core Samoylov_Island_2011/29
DOI: 10.1594/pangaea.826936
title: Geochemistry of sediment core Samoylov_Island_2011/10
DOI: 10.1594/pangaea.848290
title: Pollen in surface sediments in the Arctic Siberia

description: In total, 111 modern surface lake sediments were analysed on their pollen spectra. Field work was conducted between 2006 and 2011 during joint Russian-German expeditions in the lowlands of Arctic Siberia. At each lake centre, the upper 2 cm of sediment were retrieved using a bottom sampler or gravity corer. The distance between the westernmost sampling sites in the southern Taymyr region and the easternmost sites in the Kolyma lowlands is roughly 1800 km. The longest north-to-south transect, in the Lena region, is approximately 200 km long. The included modern July temperatures at the sites range between 7.5 and 18.5°C (based on MODIS satellite imagery from the years between 2007 and 2010, Duguay et al., 2012, doi:10.1594/PANGAEA.775962). Annual precipitation at the sites ranges between 114 to 315 mm/year (WORLDCLIM, Hijmans et al., 2005, doi:10.1002/joc.1276).
DOI: 10.1594/pangaea.899587
title: Pore Water Nutrient Data from Surface Sediments from Sonne Expedition SO245 "UltraPac"

description: Sediment pore water nutrient chemistry on surface sediments from the South Pacific Gyre. Pore waters were obtained by Rhizone sampling of sub-cores from box-cores retrieved during Expedition SO245. Nutrient were determined after three-fold dilution onboard on a QuAAtro39 autoanalyser (Seal Analytical) using the method based on Strickland and Parsons, 1972.
description: Supplement to: Ferdelman, Timothy G (2016): RV SONNE SO245 Cruise Report / Fahrtbericht, Antofagasta, Chile: 17. December 2015, Wellington, New Zealand: 28. January 2016, SO245 - UltraPac: Process oriented biogeochemical, microbiological and ecological investigations of the ultraoligotrophic South Pacific Gyre. Max-Planck-Institut für marine Mikrobiologie, Bremen, 104 pp
DOI: 10.1594/pangaea.914950
title: Thermal conductivities from IODP Site 333-C0012
DOI: 10.1594/pangaea.826954
title: Geochemistry of sediment core Samoylov_Island_2011/32
DOI: 10.1594/pangaea.901916
title: VSM properties from bulk samples of core P36 and B1-06 from the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.901901
title: Magnetic susceptibility of core B1-06, Viernheim, from the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.901899
title: Magnetic susceptibility of core UN1 and UN2, from the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.901919
title: VSM properties from magnetic extracts of core P36 and B1-06 from the Heidelberg Basin (Germany)
DOI: 10.1594/pangaea.901737
title: Levoglucosan analysis of sediment core GeoB9528-3
DOI: 10.1594/pangaea.918945
title: Estimated thermal conductivities from porosity (MAD) of IODP Site 315-C0002
DOI: 10.1594/pangaea.918950
title: Estimated thermal conductivities from porosity (Vp) of IODP Site 315-C0002
DOI: 10.1594/pangaea.826942
title: Geochemistry of sediment core Samoylov_Island_2011/19
DOI: 10.1594/pangaea.615249
title: Soil distribution and classification of sediment core Samoylov_Island_1 (center)