cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.763865
title: (Table 1) Boron concentration and d11B values of interstitial water from IODP Holes 308-U1319A, U1320A, U1322B and U1324B

description: The Integrated Ocean Drilling Program Expedition 308 (IODP308) drilled normal-pressured sediments from the Brazos-Trinity Basin IV and over-pressured sediments from the Ursa Basin on the northern slope of the Gulf of Mexico. The interstitial water samples from the normal-pressured basin show B concentrations and B isotopic compositions ranging from 255 to 631 µM (0.6 to 1.5 times of seawater value) and from +29.1 to +42.7 per mil (relative to NIST SRM 951), respectively. A wider range is observed both for B concentrations (292 to 865 µM, 0.7 to 2.1 times of seawater value) and d11B values (+25.5 to +43.2 per mil) of the interstitial water in the over-pressured basin. The down-core distribution of B concentrations and d11B values in the interstitial waters are sensitive tracers for assessing various processes occurring in the sediment column, including boron adsorption/desorption reactions involving clay minerals and organic matter in sediments as well as fluid migration and mixing in certain horizons and in the sediment column. In the normal-pressured basin adsorption/desorption reactions in shallow sediments play the major role in controlling the B content and B isotopic composition of the interstitial water. In contrast, multiple processes affect the B content and d11B of the interstitial water in the over-pressured Ursa Basin. There, the stratigraphic level of the maxima of B and d11B correspond to seismic reflectors. The intruded fluids along the seismic reflector boundary from high to low-topography mix with local interstitial water. Fluid flow is inferred in the Blue Unit (a coarse sandstone layer, connecting the high- to low-pressured region) from the freshening of interstitial water in Ursa Basin Site U1322, and upward flow by the overpressure expels fluid from the overburden above the Blue Unit.
description: Supplement to: Li, Yan-Ping; Jiang, Shao-Yong (2010): Boron concentration and isotopic constraints on processes affecting the chemistry of interstitial water in normal- and over-pressured basins, Gulf of Mexico. Marine Geology, 275(1-4), 230-243
DOI: 10.1594/pangaea.758211
title: Tab. 1+7: Hydrochemical analyses of firn and meltwater from different "cold" snow patches

description: In wide areas of Northern Siberia, glaciers have been absent since the Late Pleistocene. Therefore, ground ice and especially ice wedges are used as archives for paleoclimatic studies. In the present study, carried out on the Bykovsky Peninsula, eastern Lena Delta, we were able to distinguish ice wedges of different genetic units by means of oxygen and hydrogen isotopes. The results obtained by this study on the Ice Complex, a peculiar periglacial phenomenon, allowed the reconstruction of the climate history with a subdivision of a period of very cold winters (60-55 ka), followed by a long stable period of cold winter temperatures (50-24 ka), Between 20 ka and 11 ka, climate warming is indicated in stable isotope compositions, most probably after the Late Glacial Maximum. At that time, a change of the marine source of the precipitation from a more humid source to the present North AtIantic source region was assumed. For the Ice Complex, a continuous age-height relationship was established, indicating syngenetic vertical ice wedge growth and sediment accumulation rates of 0.7 m/ky. During the Holocene optimum, ice wedge growth was probably limited due to the extensive formation of lacustrine environments. Holocene ice wedges in thermokarst depressions (alases) and thermoerosional valleys (logs) were formed after climate deterioration from about 4.5 ka until the present. Winter temperatures were warmer at this time as compared to the cooler Pleistocene. Migration of bound water between ice wedges and segregated ice may have altered the isotopic composition of old ice wedges. The presence of ice wedges as diagnostic features for permafrost conditions since 60 ka, implies that a large glacier extending over the Laptev Sea shelf did not exist. For the remote non-glaciated areas of Northern Siberia, ice wedges were established as a powerful climate archive.
description: Supplement to: Kunitsky, Victor V; Schirrmeister, Lutz; Grosse, Guido; Kienast, Frank (2002): Snow patches in nival landscapes and their role for the Ice Complex formation in the Laptev Sea coastal lowlands. Polarforschung, 70, 53-67
DOI: 10.1594/pangaea.716835
title: Results of the pollen analysis of the Dyanushka peat sediments K7/P2

description: A 415cm thick permafrost peat section from the Verkhoyansk Mountains was radiocarbon-dated and studied using palaeobotanical and sedimentological approaches. Accumulation of organic-rich sediment commenced in a former oxbow lake, detached from a Dyanushka River meander during the Younger Dryas stadial, at ~12.5 kyr BP. Pollen data indicate that larch trees, shrub alder and dwarf birch were abundant in the vegetation at that time. Local presence of larch during the Younger Dryas is documented by well-preserved and radiocarbon-dated needles and cones. The early Holocene pollen assemblages reveal high percentages of Artemisia pollen, suggesting the presence of steppe-like communities around the site, possibly in response to a relatively warm and dry climate ~11.4-11.2 kyr BP. Both pollen and plant macrofossil data demonstrate that larch woods were common in the river valley. Remains of charcoal and pollen of Epilobium indicate fire events and mark a hiatus ~11.0-8.7 kyr BP. Changes in peat properties, C31/C27 alkane ratios and radiocarbon dates suggest that two other hiatuses occurred ~8.2-6.9 and ~6.7-0.6 kyr BP. Prior to 0.6 kyr BP, a major fire destroyed the mire surface. The upper 60 cm of the studied section is composed of aeolian sands modified in the uppermost part by the modern soil formation. For the first time, local growth of larch during the Younger Dryas has been verified in the western foreland of the Verkhoyansk Mountains (~170km south of the Arctic Circle), thus increasing our understanding of the quick reforestation of northern Eurasia by the early Holocene.
description: Empty fields in Age column indicate an undated hiatus horizon.
description: Supplement to: Werner, Kirstin; Tarasov, Pavel E; Andreev, Andrei A; Müller, Stefanie; Kienast, Frank; Zech, Michael; Zech, Wolfgang; Diekmann, Bernhard (2010): A 12.5-kyr history of vegetation dynamics and mire development with evidence of Younger Dryas larch presence in the Verkhoyansk Mountains, East Siberia, Russia. Boreas, 39, 56-68
DOI: 10.1594/pangaea.833692
title: (Figure 3) Sedimentological and biogeochemical analyses of outcrop PG2038-1

description: X-ray diffractometry - For information about the mineral contents, the samples were ground and analysed by X-ray diffractometry (XRD) using a Panalytic Empyrean X-ray diffractometer. The mineral peak area intensities were determined graphically and calculated using Macdiff (Petschick 2012). Following Vogt (2009), the semi-quantitative mineral contents were determined by the ratio of the individual peak intensities against each other. Here we used the ratio of the quartz- and feldspar peaks, and the ratio of the illite peak against the total peak area intensities of all minerals (TI).Grain-size distribution - The samples were pretreated with acetic acid to remove the inorganic carbon. In order to destroy the organic compounds, a hydrogen peroxide treatment was conducted on a platform shaker, where ammonia was used for neutralization of the pH. The sample material was dispersed and homogenized on an overhead shaker using tetrasodium pyrophosphate. The grain-size distribution was measured using a Beckmann Coulter LS 200 laser particle analyser.Biogeochemistry - Total carbon (TC) and nitrogen contents were measured simultaneously using an elemental analyser (Elementar Vario EL III). The ground and freeze-dried samples were combusted in zinc capsules together with a spatula tip of tungsten oxide as a catalyst. The total organic carbon (TOC) contents were measured thereafter using an Elementar Vario MAX C analyser. Following Meyers & Teranes (2001), the TOC/N ratios (given in weight-%) were multiplied by the ratio of the atomic weights of carbon and nitrogen in order to obtain the atomic mass ratios (TOC/N atomic). For analysis of stable carbon isotopes of TOC, the samples were freed of inorganic carbon by hydrochloric acid, and measured using a Finnigan Delta-S mass spectrometer. The results are expressed as d13C values relative to the PDB standard in parts per mil notation (per mil).
DOI: 10.1594/pangaea.833691
title: (Table 1) Age determination of outcrop PG2038-1
DOI: 10.1594/pangaea.864706
title: Relative digestive gland length to carapax length of Euphausia superba larvae during POLARSTERN cruise ANT-XXIX/7
DOI: 10.1594/pangaea.847367
title: Abundance and biomass of phytoplankton in the western part of the Black Sea during Branimir Ormanov cruise BO091999 in September 1999

description: The samples were concentrated down to 50 cm**3 by slow decantation after storage for 20 days in a cool and dark place. The species identification was done under light microscope OLIMPUS-BS41 connected to a video-interactive image analysis system at magnification of the ocular 10X and objective - 40X. A Sedgwick-Rafter camera (1ml) was used for counting. 400 specimen were counted for each sample, while rare and large species were checked in the whole sample (Manual of phytoplankton, 2005). Species identification was mainly after Carmelo T. (1997) and Fukuyo, Y. (2000). Total phytoplankton abundance was calculated as sum of taxon-specific abundances.The cell biovolume was determined based on morpho-metric measurement of phytoplankton units and the corresponding geometric shapes as described in detail in (Edier, 1979). Total phytoplankton biomass was calculated as sum of taxon-specific biomasses.
DOI: 10.1594/pangaea.833694
title: (Table 2) Overview of identified plant macrofossils of outcrop PG2038-1

description: For plant macrofossil analysis, each sample (~50 mL) was dispersed in water and sieved using 250-µm and 1-mm mesh sizes. The identifiable plant material (e.g. seeds, leaves, etc.) was picked using a Zeiss Stemi SV 11 and a Zeiss Stemi 2000-C stereo microscope. The identification of the selected macrofossils was carried out using different seed identification manuals (Beijerinck 1947; Berggren 1981; Anderberg 1994), and the reference collection at the AWI in Potsdam and the Senckenberg Research Station of Quaternary Palaeontology in Weimar. For taxonomic determination, we followed the Integrated Taxonomic Identification System (ITIS 2013), and in the case of Trichophorum cf. uniflorum we followed the World Checklist of Selected Plant Families (WCSP 2013). Species that could not be exactly identified were designated with cf. or within the genera using sp. According to Dierßen (1996), the identified taxa were categorized into different communities based on their environmental requirements.
DOI: 10.1594/pangaea.877341
title: Feldspar and Quartz of the Batagay thaw slump, Northeastern Siberia
DOI: 10.1594/pangaea.877345
title: Grain size distribution of the Batagay thaw slump, Northeastern Siberia

description: We described the Batagay permafrost sequence during the June 2014 field campaign. The 60m high outcrop was sampled from top to bottom along its height, ideally in 1m steps, but depending on its accessibility. The sampling procedure was carried out as follows: (1) the cryolithological characteristics at each sampling point were described and photographed, (2) the sampling zone was cleaned, and (3) frozen deposits were taken using a hammer and a chisel and placed into plastic bags. The wet sediments were air-dried in the field and split into subsamples for sedimentological and biogeochemical analysis in the laboratories of the Alfred Wegener Institute in Potsdam. Grain size analyses of the &lt; 2mm fraction were carried out using an LS 200 laser particle analyser (Beckman Coulter GmbH).
DOI: 10.1594/pangaea.833075
title: Seawater carbonate chemistry and proportion of different dissolution levels in live juvenile Limacina helicina antarctica from the natural environment and ship-board incubations

description: The carbonate chemistry of the surface ocean is rapidly changing with ocean acidification, a result of human activities. In the upper layers of the Southern Ocean, aragonite-a metastable form of calcium carbonate with rapid dissolution kinetics-may become undersaturated by 2050. Aragonite undersaturation is likely to affect aragonite-shelled organisms, which can dominate surface water communities in polar regions. Here we present analyses of specimens of the pteropod Limacina helicina antarctica that were extracted live from the Southern Ocean early in 2008. We sampled from the top 200 m of the water column, where aragonite saturation levels were around 1, as upwelled deep water is mixed with surface water containing anthropogenic CO2. Comparing the shell structure with samples from aragonite-supersaturated regions elsewhere under a scanning electron microscope, we found severe levels of shell dissolution in the undersaturated region alone. According to laboratory incubations of intact samples with a range of aragonite saturation levels, eight days of incubation in aragonite saturation levels of 0.94-1.12 produces equivalent levels of dissolution. As deep-water upwelling and CO2 absorption by surface waters is likely to increase as a result of human activities, we conclude that upper ocean regions where aragonite-shelled organisms are affected by dissolution are likely to expand.
description: In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2014-05-29.
description: Supplement to: Bednaršek, Nina; Tarling, Geraint A; Bakker, Dorothee C E; Fielding, Sophie; Jones, Elizabeth M; Venables, H J; Ward, Peter; Kuzirian, Alan; Lézé, Bertrand; Feely, Richard A; Murphy, Eugene J (2012): Extensive dissolution of live pteropods in the Southern Ocean. Nature Geoscience, 5(12), 881-885
DOI: 10.1594/pangaea.882619
title: Plant macrofossil records from permafrost deposits of the Bol'shoy Lyakhovsky Island (New Siberian Archipelago)

description: To evaluate the consequences of possible future climate changes and to identify the main climate drivers in high latitudes, the vegetation and climate in the East Siberian Arctic during the last interglacial are reconstructed and compared with Holocene conditions. Plant macrofossils from permafrost deposits on Bol'shoy Lyakhovsky Island, New Siberian Archipelago, in the Russian Arctic revealed the existence of a shrubland dominated by Duschekia fruticosa, Betula nana and Ledum palustre and interspersed with lakes and grasslands during the last interglacial. The reconstructed vegetation differs fundamentally from the high arctic tundra that exists in this region today, but resembles an open variant of subarctic shrub tundra as occurring near the tree line about 350 km southwest of the study site. Such difference in the plant cover implies that, during the last interglacial, the mean summer temperature was considerably higher, the growing season was longer, and soils outside the range of thermokarst depressions were drier than today. Our pollen-based climatic reconstruction suggests a mean temperature of the warmest month (MTWA) range of 9-14.5 °C during the warmest interval of the last interglacial. The reconstruction from plant macrofossils, representing more local environments, reached MTWA values above 12.5 °C in contrast to today's 2.8 °C. We explain this contrast in summer temperature and soil moisture with a combination of summer insolation higher than present and climatic continentality in arctic Yakutia stronger than present as result of a considerably less inundated Laptev Shelf during the last interglacial.
description: Supplement to: Kienast, Frank; Tarasov, Pavel E; Schirrmeister, Lutz; Grosse, Guido; Andreev, Andrei A (2008): Continental climate in the East Siberian Arctic during the last interglacial: Implications from palaeobotanical records. Global and Planetary Change, 60(3-4), 535-562
DOI: 10.1594/pangaea.736027
title: (Table 2) Radiocarbon age determinations from Mamontovy Klyk
DOI: 10.15468/dl.eq7r8x
title: Occurrence Download

description: A dataset containing 24491 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Cisticola exilis",
 "Geometry POLYGON((119.300000 20.500000, 122.100000 20.500000, 122.100000 25.400000, 119.300000 25.400000, 119.300000 20.500000))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 24491 records from 16 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001333-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.25757h
title: Occurrence Download

description: A dataset containing 2194652 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is one of (Material citation, Material sample, Occurrence evidence)",
 "Country is one of (Martinique, Bahamas, Haiti, Mexico, Guadeloupe, Cuba, Jamaica, Dominican Republic, United States of America, Cayman Islands)",
 "Geometry POLYGON((-97.48196 18.06826,-90.73278 17.90693,-90.43343 19.60756,-88.48766 20.73151,-88.93668 16.04604,-83.903 13.32645,-77.43916 11.92604,-59.31602 14.22187,-59.31602 30.10815,-79.78831 33.59101,-88.78701 30.56357,-96.57587 30.10815,-98.51588 24.40732,-97.48196 18.06826))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 2194652 records from 546 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001315-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.3f6g7n
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Anoda cristata",
 "Country is Lithuania",
 "HasCoordinate is true"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001335-250920141307145/datasets/export for details.
DOI: 10.15468/dl.nrnrcv
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Anoda cristata",
 "Country is Uzbekistan",
 "HasCoordinate is true"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001336-250920141307145/datasets/export for details.
DOI: 10.15468/dl.d4kbaz
title: Occurrence Download

description: A dataset containing 8 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Anoda cristata",
 "Country is Japan",
 "HasCoordinate is true"
 ]
}

 The dataset includes 8 records from 3 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001334-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.gcqxvd
title: Occurrence Download

description: A dataset containing 1 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Hibiscus trionum",
 "Country is Belarus",
 "HasCoordinate is true"
 ]
}

 The dataset includes 1 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001338-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.ax5kph
title: Occurrence Download

description: A dataset containing 207 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Hibiscus trionum",
 "Country is Belgium",
 "HasCoordinate is true"
 ]
}

 The dataset includes 207 records from 9 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001339-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.fv2sea
title: Occurrence Download

description: A dataset containing 26 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Hibiscus trionum",
 "Country is Bosnia and Herzegovina",
 "HasCoordinate is true"
 ]
}

 The dataset includes 26 records from 4 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001340-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25959/2rkj-h521
title: Testing the effects of scale on benthic habitat modelling in the South-west Corner Marine Park
DOI: 10.15468/dl.y6hzv6
title: Occurrence Download

description: A dataset containing 23759 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((-103.49606 20.69513,-103.49846 20.65927,-103.49869 20.63321,-103.49152 20.62102,-103.46714 20.61098,-103.42985 20.60787,-103.40977 20.60979,-103.38204 20.60118,-103.36889 20.57799,-103.361 20.56891,-103.34403 20.56269,-103.33279 20.56317,-103.31319 20.57154,-103.29981 20.58492,-103.28498 20.60285,-103.28044 20.62174,-103.28451 20.63082,-103.301 20.63895,-103.3175 20.64014,-103.34929 20.64373,-103.36124 20.6509,-103.38108 20.66524,-103.41407 20.67194,-103.45256 20.67935,-103.47025 20.69011,-103.48077 20.69441,-103.49606 20.69513))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present"
 ]
}

 The dataset includes 23759 records from 143 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001342-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.yahtr9
title: Occurrence Download

description: A dataset containing 42 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Hibiscus trionum",
 "Country is Bulgaria",
 "HasCoordinate is true"
 ]
}

 The dataset includes 42 records from 8 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001343-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.9sjckg
title: Occurrence Download

description: A dataset containing 301 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Hibiscus trionum",
 "Country is Canada",
 "HasCoordinate is true"
 ]
}

 The dataset includes 301 records from 12 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001344-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.7fw6a3
title: Occurrence Download

description: A dataset containing 15 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Hibiscus trionum",
 "Country is Chile",
 "HasCoordinate is true"
 ]
}

 The dataset includes 15 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001345-250920141307145/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.