cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.959353
title: Water isotopologues of near-surface polar snow from short (1-m) snow cores, extracted from the EastGRIP site on Greenland Ice Sheet during summers 2017-2019 with age-depth model (depthIndex_manualConstModel)

description: 1-m vertical resolution snow profile isotope data (dD, d18O, dxs, dxsln) from EastGRIP, Greenland. An age-depth model has been applied based on when peak monthly temperatures occur. The results of this modeled snow age are called ageDepth in this data set. In the absence of constrained peak temperatures, a manual assignment of end date for the profile was made based first on the mean accumulation for the relevant time period was used for the age-depth model and then the likely timing of the final d18O values.
DOI: 10.1594/pangaea.962669
title: Annual patterns in algal pigment distribution in Arctic second year ice during the MOSAiC expedition 2019/2020

description: Algal pigment concentrations were retrieved from samples from second-year (SYI) ice, during the whole MOSAiC expedition (Multidisciplinary drifting Observatory for the Study of Arctic Climate) in 2019 to 2020. During MOSAiC, RV Polarstern anchored into an ice floe to gain new insights into Arctic climate over a full annual cycle. Sea ice data were collected starting with the onset of the study, at 85 degrees north and 137 degrees east, following the drift towards the Fram Strait, and returning into the marginal ice zone during the 4th leg of the expedition. Ice cores were collected at the various coring sites together with teams ICE and BGC (Nicolaus et al. 2022), to study the development of pigment patterns over time, on 3 specific ice-locations. Altogether, 277 samples have been collected and analysed. Ice cores were sliced in sections of 5-10 cm before analyses. Each of the sections was melted at room temperature after additions of filtered ambient seawater, under dark conditions. After extraction in 90 % acetone, samples were analysed using high-performance liquid chromatography (HPLC) on a Waters system (AWI). Algal pigments contain a multiple set of information. Firstly, pigment concentrations can show the presence of algal biomass in the various domains sampled. Secondly, marker pigments can reveal seasonal and temporal dynamics in algal community structure, by discerning specific algal classes like diatoms, cryptophytes, haptophytes and chlorophytes that have specific roles in biogeochemical cycles. Thirdly, certain pigments are indicative of the (photo)-physiological state of micro-algae and fourth, degradation products of the main chlorophyll a pigment further give an indication about senescence and grazing in the various habitats.
DOI: 10.1594/pangaea.964080
title: Coral Li/Mg records of deep sea temperature during the last deglaciation

description: Fossil scleractinian corals were collected from the Galápagos platform in the East Equatorial Pacific (0°N, 90°E) on cruises MV1007 and NA064 from water depths between 419 and 650 m. Equatorial Atlantic corals (taxa Caryophyllia, Enallopsammia, Desmophyllum) were collected from a depth range of 749 to 2814 m during Cruise JC094 from Carter Seamount (9.2°N, 21.3°W), Knipovich Seamount (5.6°N, 26.9°W), Vema Fracture Zone (10.7°N, 44.6°W), Vayda Seamount (14.9°N, 48.2°W) and Gramberg Seamount (15.4°N, 51.1°W). Southern Ocean samples were obtained from Burdwood Bank (54.7°S, 62.2°W; taxa Caryophyllia, Balanophyllia, Flabellum, Desmophyllum) and Cape Horn (57.2°S, 67.1°W; taxa Caryophyllia, Balanophyllia, Flabellum) in the Subantarctic Zone and the Sars and Interim Seamounts in the Polar Front Zone (59.7°S, 68.8°W and 60.6°S, 66.0°W; taxa Caryophyllia, Desmophyllum) on cruises NBP0805 and NBP1103 in the Drake Passage. These proximal Sars and Interim sites are grouped as simply "Sars". The shallowest coral samples come from depths of 334 m on Burdwood Bank however the majority are from 700 to 1520 m, at water depths corresponding to modern Antarctic Intermediate Water. Corals recovered from the depth of 1012 m from Cape Horn and further south from Sars Seamount at depths of 695 to 1200 m are currently bathed in Upper Circumpolar Deep Water. Deeper samples at the Sars Seamount site sit within Lower Circumpolar Deep Water (1300 to 1750 m). We use published U-series dates for all samples (Burke and Robinson, 2012; Chen et al., 2020; Chen et al., 2015; Li et al., 2020; Margolin et al., 2014; Stewart et al., 2021). Reported age uncertainties are typically ±1% (2 SD). Whole "S1" septa and attached theca were taken from cup corals while whole calyxes were taken from branching specimens using a rotary cutting tool. This tool was further used to remove surficial oxide coatings and any chalky altered carbonate. Where sufficient sample material allowed, multiple sub-samples were measured to minimize microstructural bias (typically duplicates). Coral fragments were crushed and cleaned using warm 1% H2O2 (buffered in NH4OH) oxidative cleaning and a weak acid polish (0.0005 M HNO3). Samples were dissolved in 0.5 M HNO3 and analysed by ICP-MS to yield Li/Mg ratios. Repeat analysis of NIST RM 8301 (Coral) (n=19) yielded analytical precision of &lt;± 1.5%. Coral Li/Mg was converted to temperature using a calibration applicable to all aragonitic corals (Li/Mg = 5.42 exp(−0.050×T(°C)); (Stewart et al., 2020). The quoted uncertainty on this calibration based on prediction intervals is ± 1.7 °C (1σ). This uncertainty is significantly reduced however at extremely low temperatures close to the freezing point of seawater (~ −2 °C). Corals could not survive in frozen seawater, therefore, where proxy estimated temperature falls below this minimum a value of −2 °C is reported instead. For Li/Mg averages of each coral sample and conversion to bottom water temperature, see the xlsx version of the dataset under Further details.
DOI: 10.1594/pangaea.942238
title: Radiocarbon age measurements on foraminifera from sediment core OR1-1218-C2-BC, small number samples
DOI: 10.1594/pangaea.984057
title: Biotic C cycling from stable isotope tracer incubation experiments under climate change projections in the Cabo Verde Basin, NE Atlantic

description: An experimental approach was developed to assess the individual and combined effects of two climate change stressors (temperature and POC quality) on soft sediments in the bathyal continental margin of the Cabo Verde Basin (CVB, Equatorial Atlantic). The study used stable isotope tracer incubation experiments with 13C and 15N labelled diatoms Phaeodactylum tricornutum, to simulate climate change projections for the next century. A balanced experimental design was employed to examine the impacts of increased temperature (+2 °C), reduced POC quality (dialysed labile fraction), or both, compared to a control treatment. The experiments were carried out onboard the research vessel Sarmiento de Gamboa during the iMirabilis2 campaign in August 2021 (Orejas et al., 2022). A total of 19 sediment samples were collected by four multi-corer (MUC) deployments. From each MUC deployment, four cores with clear overlying water were randomly selected and assigned among the four different treatments (total n= 4 for each of 4 treatments), and the remaining three cores were used as background for natural stable isotopes. The upper 15-18 cm of sediment from each core was extruded to an incubation core (inner diameter 10 cm) closed airtight at the bottom. The incubation cores were placed in buckets with filtered seawater at the experimental temperature. After an equilibration period of 147 to 173 hours, the stable isotope experiment began with the injection of 12.5 mg of fresh or partially degraded diatoms into each core, representing approximately 10% of the average annual POC flux for the region (Sweetman et al., 2017). The experiment lasted 48 hours after the algae injection, with the cores maintained under constant aeration. During the incubation, Sediment Community Oxygen Consumption (SCOC) rates and DI13C production rates were measured twice (at T10 and at T45). At the experiment's conclusion, sediment samples were stored at -80°C for Phospho Lipid derived Fatty Acid (PLFA) analysis or fixed in 10% borax-buffered formalin seawater for macrofauna analysis (Gaurisas et al. 2024). Phospho Lipid derived Fatty Acid (PLFA) extraction according to Shahbaz et al. (2020) followed by Gas Chromatography Isotope Ratio Mass Spectrometry (GC-IRMS) according to Thornton et al. (2011), utilising bacterial biomarker C15:0i and related biomarker-specific fraction (7.4%) from Rajendran et al. (1993). Followed by adjustment for sediment Dry Bulk Density (DBD = 2.50 g cm-3) and sediment porosity (= 0.61) according to Thiede et al. (1982); followed by adjustment for bacterial-cell specific PLFA concentration (= 0.056 g C PLFA g-1 C) according to Brinch-Iversen & King (1990).
DOI: 10.1594/pangaea.984058
title: Sediment fluxes from stable isotope tracer incubation experiments under climate change projections in the Cabo Verde Basin, NE Atlantic

description: An experimental approach was developed to assess the individual and combined effects of two climate change stressors (temperature and POC quality) on soft sediments in the bathyal continental margin of the Cabo Verde Basin (CVB, Equatorial Atlantic). The study used stable isotope tracer incubation experiments with 13C and 15N labelled diatoms Phaeodactylum tricornutum, to simulate climate change projections for the next century. A balanced experimental design was employed to examine the impacts of increased temperature (+2 °C), reduced POC quality (dialysed labile fraction), or both, compared to a control treatment. The experiments were carried out onboard the research vessel Sarmiento de Gamboa during the iMirabilis2 campaign in August 2021 (Orejas et al., 2022). A total of 19 sediment samples were collected by four multi-corer (MUC) deployments. From each MUC deployment, four cores with clear overlying water were randomly selected and assigned among the four different treatments (total n= 4 for each of 4 treatments), and the remaining three cores were used as background for natural stable isotopes. The upper 15-18 cm of sediment from each core was extruded to an incubation core (inner diameter 10 cm) closed airtight at the bottom. The incubation cores were placed in buckets with filtered seawater at the experimental temperature. After an equilibration period of 147 to 173 hours, the stable isotope experiment began with the injection of 12.5 mg of fresh or partially degraded diatoms into each core, representing approximately 10% of the average annual POC flux for the region (Sweetman et al., 2017). The experiment lasted 48 hours after the algae injection, with the cores maintained under constant aeration. During the incubation, Sediment Community Oxygen Consumption (SCOC) rates and DI13C production rates were measured twice (at T10 and at T45). At the experiment's conclusion, sediment samples were stored at -80°C for Phospho Lipid derived Fatty Acid (PLFA) analysis or fixed in 10% borax-buffered formalin seawater for macrofauna analysis (Gaurisas et al. 2024). Phospho Lipid derived Fatty Acid (PLFA) extraction according to Shahbaz et al. (2020) followed by Gas Chromatography Isotope Ratio Mass Spectrometry (GC-IRMS) according to Thornton et al. (2011), utilising bacterial biomarker C15:0i and related biomarker-specific fraction (7.4%) from Rajendran et al. (1993). Followed by adjustment for sediment Dry Bulk Density (DBD = 2.50 g cm-3) and sediment porosity (= 0.61) according to Thiede et al. (1982); followed by adjustment for bacterial-cell specific PLFA concentration (= 0.056 g C PLFA g-1 C) according to Brinch-Iversen & King (1990).
DOI: 10.1594/pangaea.895370
title: Collection data and Genbank numbers of Lamellomorpha and Poecillastra species from New Zealand

description: Collection data and Genbank numbers (COI and 28S (C1-C2)) for New Zealand specimens of Lamellomorpha and Poecillastra studied by Kelly et al.
description: Collector abbreviations:NZOI = New Zealand Oceanographic InstituteNIWA = National Institute of Water and Atmospheric ResearchMFish = Ministry of Fisheries, now known as the Ministry for Primary Industires.MPI = Ministry for Primary IndustriesSOP = Scientific Observer Programme (MPI)
description: Supplement to: Kelly, Michelle; Cárdenas, Paco; Rush, Nicola; Sim-Smith, Carina; MacPherson, Diana; Page, Mike; Bell, Lori J (2019): Molecular study supports the position of New Zealand endemic genus Lamellomorpha in family Vulcanellidae (Demospongiae, Tetractinellida, Astrophorina), with the description of three new species. European Journal of Taxonomy, 506, 1-25
DOI: 10.1594/pangaea.958683
title: Plant DNA taxa detected in Lake Verney sediments (North-western Alps) over the last 4600 years

description: This dataset contains plant taxa detected by sedimentary DNA analyses. The dataset is presented in number of DNA sequences by replicate of analyses (12 PCR replicates). It has been generated applying the DNA metabarcoding approach on the upper 1.4-m of sediments. The 2.4-m long sediment core was retrieved by using an Uwitec piston coring device. The primers used are g (5'-GGGCAATCCTGAGCCAA-3') and h (5'-CCATTGAGTCTCTGCACCTATC-3') (Taberlet, P., et al. Power and limitations of the chloroplast trn L (UAA) intron for plant DNA barcoding. Nucleic acids research, 35(3), e14-e14. (2007)). The sequences were then produced by the Illumina technology (HiSeq instrument). The bioinformatic treatment of the sequences was operated applying the Obitool program (Boyer, F. et al. OBITOOLS:aUNIX-inspired software package for DNAmetabarcoding. Mol. Ecol. Resour. 16, 176–182 (2016)) and following the procedure described in Giguet-Covex et al. New insights on lake sediment DNA from the catchment: importance of taphonomic and analytical issues on the record quality. Scientific Reports. 9, 14676 (2019) (DOI https://doi.org/10.1038/s41598-019-50339-1). Further filtering treatments were then applied, as also described in Giguet-Covex et al. 2019. These second treatments allow the removal of 1) taxa assigned to a reference taxon at &lt;95 % of sequence identity, 2) potential contaminations (based on sampling, extraction and PCR controls, and recognition of exotic taxa) and 3) stochastic detections.
DOI: 10.1594/pangaea.945564
title: Snow stable water isotopes of a 1 cm deep sublimation sampling scheme at the EastGRIP deep drilling site, summer season 2019

description: Snow samples were taken along a 90 m transect at the EastGRIP ice core deep drilling site perpendicular to the prevailing wind direction.The snow was collected after precipitation events from the very surface (0 - 0.5 cm) and from the top centimeter at 10 positions with 10 m spacing. The samples were shipped frozen to the Alfred-Wegener-Institute and stored at -25 °C. Prior to measurements the samples were melted in the sample bags at room temperature. For the measurement of the isotopic composition a Picarro L2120-i, a Picarro L2140-i and a Picarro L2130-i with a high-throughput vaporizer (model A0212) was used. The measurement set-up followed the Van-Geldern protocol (van Geldern and Barth, 2012). Each sample was injected four times and the standard deviation is computed. We calculate the average over all the standard deviations as a measure of uncertainty. We find this average to be 0.03 permil for δ18O (with stdev 0.02) and 0.13 permil for δD (stdev 0.11). The maximum standard deviation within the data set was found to be 0.10 for δ18O and 0.8 for δD. As a measure of accuracy the off-set between the defined and measured value of the quality check standard for each measurement run is provided. We calculate the average of this off-set for the whole data set and obtain a value of -0.04 permil for δ18O (stdev 0.07) and -0.6 permil for δD (stdev 0.4). The maximum off-set found within the data set was 0.18 permil for δ18O and -1.5 permil for δD.
DOI: 10.1594/pangaea.923749
title: Bulk isotope data of deep sea fauna, organic matter and sediment of a sponge ground on an Arctic North Atlantic seamount

description: SPOM= suspended particulate organic mattertrap = sediment trapbottom= bottom water in 10 m above bottomsurface= surface water
DOI: 10.1594/pangaea.945565
title: Snow stable water isotopes of a 0.5 cm deep sublimation sampling scheme at the EastGRIP deep drilling site, summer season 2019

description: Snow samples were taken along a 90 m transect at the EastGRIP ice core deep drilling site perpendicular to the prevailing wind direction.The snow was collected after precipitation events from the very surface (0 - 0.5 cm) and from the top centimeter at 10 positions with 10 m spacing. The samples were shipped frozen to the Alfred-Wegener-Institute and stored at -25 °C. Prior to measurements the samples were melted in the sample bags at room temperature. For the measurement of the isotopic composition a Picarro L2120-i, a Picarro L2140-i and a Picarro L2130-i with a high-throughput vaporizer (model A0212) was used. The measurement set-up followed the Van-Geldern protocol (van Geldern and Barth, 2012). Each sample was injected four times and the standard deviation is computed. We calculate the average over all the standard deviations as a measure of uncertainty. We find this average to be 0.03 permil for δ18O (with stdev 0.02) and 0.13 permil for δD (stdev 0.11). The maximum standard deviation within the data set was found to be 0.10 for δ18O and 0.8 for δD. As a measure of accuracy the off-set between the defined and measured value of the quality check standard for each measurement run is provided. We calculate the average of this off-set for the whole data set and obtain a value of -0.04 permil for δ18O (stdev 0.07) and -0.6 permil for δD (stdev 0.4). The maximum off-set found within the data set was 0.18 permil for δ18O and -1.5 permil for δD.
DOI: 10.1594/pangaea.903257
title: Weather station (Meteo Buoy WeatherStation Instrument 150WX) measurements collected at the OBSEA underwater observatory buoy during February, 2016
DOI: 10.1594/pangaea.913704
title: Multibeam Bathymetry in the Romanian Territory Waters of the Black Sea

description: During a cruise within the ENVRI+ Project WP4, a joint pilot experiment to measure methane transfer from the seafloor to the atmosphere, bathymetry was recorded using a hull-mountes Elac Seabeam 1050 multibeam system. The data contain a 10m grid file as well as ungridded .xyz.
DOI: 10.1594/pangaea.903268
title: Weather station (Meteo Buoy WeatherStation Instrument 150WX) measurements collected at the OBSEA underwater observatory buoy during July, 2016
DOI: 10.1594/pangaea.957072
title: Input data of Foraminifera 14C ages, tie-points, reservoir age and calculation settings to generate the age-depth model of ODP Site 202-1234
DOI: 10.1594/pangaea.889711
title: Species Richness and Taxonomic effort on the study of Octocorallia of the Azores

description: Knowledge on Azorean octocorals is still dispersed in several taxonomical papers and monographs. Moreover it is hard to find and written in different languages representing a challenge for zoological nomenclature and taxonomic studies. Taxonomic literature about octocorals (orders Alcyonacea and Pennatulacea) inhabiting the Azores marine waters was compiled from the 19th century onwards. Papers and monographs were analysed in order to calculate the taxonomic effort applied to different ranks of Octocorallia in the region. Moreover, the number of species given to the Azores was presented within each family, suborder and order of Octocorallia. The dataset compiles literature references and species richness distributed within Octocorallia ranks. Both are essential for future taxonomical, ecological, molecular and conservation studies about Azorean Cold-water octocorals.
description: Supplement to: Sampaio, Íris; Freiwald, André; Porteiro, Filipe; Menezes, Gui M; Carreiro-Silva, Marina (2019): Census of Octocorallia (Cnidaria: Anthozoa) of the Azores (NE Atlantic) with a nomenclature update. Zootaxa, 4550(4), 451
DOI: 10.1594/pangaea.897250
title: Ingested microplastics identified from macrobenthos collected during the RRS Discovery D340b Research Cruise to the Mingulay Reef Complex (Outer Hebrides, western Scotland, northeast Atlantic)

description: Analyzing historic cruise data for microplastics is an effective way to create baseline level understanding of microplastic pollution through time. This study analyzed 112 benthic specimens gut contents for ingestion of microplastics. These specimens were collected as part of a research cruise on the RRS Discovery D340b from 26 June to 4 July 2009 as part of the Oceans 2025 programme, the cruise Chief Scientist being Mark Inall. Out of the 112 specimens dissected, only 9 contained microplastic samples. These samples were photographed and their microplastic signatures were analysed using Raman Spectroscopy.
description: Supplement to: La Beur, Laura; Henry, Lea-Anne; Kazanidis, Georgios; Hennige, Sebastian; McDonald, Alison; Roberts, J Murray (2019): Baseline Assessment of Marine Litter and Microplastic Ingestion by Cold-Water Coral Reef Benthos at the East Mingulay Marine Protected Area (Sea of the Hebrides, Western Scotland). Frontiers in Marine Science, 6, 80
DOI: 10.1594/pangaea.934158
title: Distribution of lagoons along the Arctic coast from the Taimyr Peninsula in Russia to the Tuktoyaktuk Peninsula in Canada

description: KML files showing the distribution of lagoons wider than 500 m along the Arctic coast from the Taimyr Peninsula in Russia to the Tuktoyaktuk Peninsula in Canada. There are two files: one specific to thermokarst lagoons and the other showing all lagoons. Interconnected lagoons are marked as one system. The criteria for the identification of thermokarst lagoons is described in Angelopoulos et al. (2021).
DOI: 10.1594/pangaea.963589
title: KOSMOS 2018 Gran Canaria mesocosm study on artificial upwelling: mesozooplankton trophic position and diatom fatty acid markers

description: Mesozooplankton trophic markers to estimate food web length (δ15N) and dietary contribution of diatoms (fatty acids) during the mesocosm experiment in the Canary Islands in autumn 2018. Depth-integrated (0-14 m) plankton nets were taken and omnivorous copepods &gt;200µm used for trophic marker analysis. For trophic level, copepods were picked in groups into tin capsules and δ15N measured in a mass spectrometer. Particulate organic matter (&gt;0.7µm) δ15N was also measured to calculate an autotroph baseline. The difference between copepod and autotroph δ15N was used as trophic level proxy. Trophic level data represents averages across all samples from day 11 to 38. For fatty acids (FA), copepods were picked in groups and FA composition determined by gas chromatography. Particulate organic matter (&gt;0.7µm) FA were also measured as baseline. The marker 20:5ω3/22:6ω3 was most suitable to track the propagation of diatom productivity up the food web. FA data represents averages across samples taken on day 30 and 36. The upwelling treatment started on day 4. Methodological details in Ortiz et al. (2022) (doi:10.3389/fmars.2021.743105), Baumann et al. (2021) (doi:10.3389/fmars.2021.742142) and Goldenberg et al. (under review).