cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.788797
title: (Table T4) Nannofossil datums and ages of ODP Leg 168 sites

description: A study on late Pliocene and Quaternary calcareous nannofossils from the eastern flank of the Juan de Fuca Ridge was carried out to provide a detailed biochronology for sediments recovered during Leg 168 and to investigate the effects of hydrothermal circulation and turbidite activity on diagenesis of nannofossils. Through high-resolution stratigraphical analysis, 10 Quaternary nannofossil events were determined and a detailed biochronology of the Quaternary was obtained. Upper Pliocene sediments were also recovered but did not contain any upper Pliocene marker species, such as Discoaster species. However, an age of younger than 3.2 Ma was estimated for these sediments based on evidences of nannofossil assemblages. Based on the resolved biostratigraphy, sedimentation rates of sediment sequences at these 10 sites and their variations were determined. A sedimentation hiatus between basal sediments and basements in this young seafloor region was observed. Relative abundance of nannofossils in sediments is largely changed by dilution of turbiditic materials. Evidence suggests that variations in relative group abundance of nannofossils in the Juan de Fuca Ridge, affected by dilution of turbiditic materials, does not reflect the real variation in production of this group of microfossils.Observations of this study suggest that calcite overgrowth of nannofossils is controlled by temperature, heat flow, thermal gradient in sediments, and the variation in composition of pore water, as well as the supply of calcite materials in sediments. These results provide a detailed knowledge about effects of low-temperature hydrothermal alteration on diagenesis of nannofossils. Downhole variations in dissolution degree of nannofossils in sediment sequences at all Leg 168 sites were presented and compared with pH profiles. The correlation between these data indicates that nannofossils are very sensitive to variations in pH units in sediments. A reduction of pH will result in dissolution of nannofossils. Variations in pH units are induced by hydrothermal circulation as a result of a number of interactions between water/sediments and water/basement. The dissolution of nannofossils at Sites 1031 and 1032 were directly affected further by the pore-water upward flows at these two sites. A few records of nannofossil preservation suggest that the effects of hydrothermal activity on diagenesis of nannofossils might involve more complicated processes and mechanisms that we do not understand yet.
description: Supplement to: Su, Xin; Baumann, Karl-Heinz; Thiede, Jörn (2000): Calcareous nannofossils from Leg 168: biochronology and diagenesis. In: Fisher, A; Davis, EE; Escutia, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 168, 1-11
DOI: 10.1594/pangaea.704630
title: (Table 2) Stable oxygen and carbon isotope composition of Neogloboquadrina pachyderma from ODP Site 162-985 in the Norway Basin
DOI: 10.1594/pangaea.908198
title: Stable water isotope composition (δ¹⁸O, δD, d excess) of firn core BAL-1
DOI: 10.1594/pangaea.908204
title: Stable water isotope composition (δ¹⁸O, δD, d excess) of firn core SCH-2
DOI: 10.1594/pangaea.894297
title: Maximum diameter of Neogloboquadrina pachyderma sinistral of ODP Hole 104-644 in the Norwegian-Greenland Sea
DOI: 10.1594/pangaea.873038
title: Stable isotopes, bromine, iodine, and sodium measured in surface snow of core TD_GV7_traverse_8
DOI: 10.1594/pangaea.381421
title: Radiosonde PS45/16265 during POLARSTERN cruise ARK-XIII/3 on 1997-09-14 09:59h

description: Height of tropopause 8827 m, precipitable water content 0.3318 cm
DOI: 10.1594/pangaea.206408
title: Sedimentology and age control parameter of core PS2200-5

description: Georeference age is given in calendar years.
DOI: 10.1594/pangaea.69057
title: Sediment components of core SO82-4

description: Ages corrected for an ocean reservoir age of 400 14C yr. Combined profile of SO82_4-1 (0-35cm) and SO82_4-2 (89cm=1cm of SO82_4-2).
DOI: 10.1594/pangaea.832340
title: Environmental controls on the Emiliania huxleyi calcite mass

description: Although ocean acidification is expected to impact (bio)calcification by decreasing the seawater carbonate ion concentration, [CO3]2-, there exists evidence of non-uniform response of marine calcifying plankton to low seawater [CO3]2-. This raises questions on the role of environmental factors other than acidification and on the complex physiological responses behind calcification. Here we investigate the synergistic effect of multiple environmental parameters, including temperature, nutrient (nitrate and phosphate) availability, and seawater carbonate chemistry on the coccolith calcite mass of the cosmopolitan coccolithophore Emiliania huxleyi, the most abundant species in the world ocean. We use a suite of surface (late Holocene) sediment samples from the South Atlantic and southwestern Indian Ocean taken from depths lying well above the modern lysocline. The coccolith calcite mass in our results presents a latitudinal distribution pattern that mimics the main oceanographic features, thereby pointing to the potential importance of phosphorus and temperature in determining coccolith mass by affecting primary calcification and possibly driving the E. huxleyi morphotype distribution. This evidence does not necessarily argue against the potentially important role of the rapidly changing seawater carbonate chemistry in the future, when unabated fossil fuel burning will likely perturb ocean chemistry beyond a critical point. Rather our study highlights the importance of evaluating the combined effect of several environmental stressors on calcifying organisms to project their physiological response(s) in a high CO2 world and improve interpretation of paleorecords.
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 2014-05-06.
description: Supplement to: Horigome, Mariana Tatsumi; Ziveri, Patrizia; Grelaud, Michaël; Baumann, Karl-Heinz; Marino, Gianluca; Mortyn, P G (2014): Environmental controls on the Emiliania huxleyi calcite mass. Biogeosciences, 11(8), 2295-2308
DOI: 10.1594/pangaea.186467
title: Geometry of coccolith Calcidiscus leptoporus in sediment core GIK23062-4

description: measured on Calcidiscus leptoporus
DOI: 10.1594/pangaea.783549
title: (Fig. 6) Bulk grain size mass frequencies of sediment core GeoB130206-1
DOI: 10.1594/pangaea.186475
title: Coccoliths in sediment core GIK23065-3
DOI: 10.1594/pangaea.206411
title: Beryllium 10 analysis of sediment core PS2178-5 from the Arctic Ocean
DOI: 10.1594/pangaea.831475
title: (Table 1) Biogeographic distribution of living coccolithophores in the Pacific sector of the Southern Ocean

description: This paper adds to a series of studies addressing the distribution of living coccolithophores in the Southern Ocean (SO). We investigated plankton samples collected during RV Polarstern cruise ANT-XXVI/2 (from 27th November 2009 to 27th January 2010) along a broad E-W transect in the Pacific sector of the SO during austral summer. One hundred and fifty samples fromtwenty-nine stationswere collected fromthe upper 150mof the water column. Both coccoliths and coccospheres per samplewere counted separately using a scanning electronmicroscope (SEM). The highest abundances of 640 · 103 coccospheres/l were reached close to the Subtropical Front (STF) and increases in the numbers of coccospheres and coccoliths were found both at the Subantarctic Front (SAF) and the Polar Front (PF). However, the numbers decrease southward until almost a monospecific assemblage and sporadic record of Emiliania huxleyi (types B/C and C) south of the PF. Thirty-three coccolithophore species, including sixteen species found as isolated coccoliths, were identified of which E. huxleyi is clearly the most dominant coccolithophore taxon in the studied samples. Two main coccolithophore assemblages were established coincident with areas bounded by the oceanographic fronts: the Polar Front Zone (PFZ) and Subantarctic Zone (SAZ). In the upper photic zone of the SAZ, Acanthoica quattrospina, Calcidiscus leptoporus, Coccolithus pelagicus (sensu lato) HOL, E. huxleyi type A, Ophiaster spp. and Syracosphaera spp. among others were found. The PFZ was characterized by a reduced number of species, i.e., Calciopappus caudatus, E. huxleyi types B, B/C and C, as well as Pappomonas spp. and Papposphaera spp. The sea surface temperature measured in situ was the most prominent factor influencing coccolithophore diversity, distribution and assemblage compositions in the Pacific sector of the SO during austral summer. Coccolithophore biogeography in the study area showed marked differences with the northern high latitudes; the reduced presence of the cold water species Coccolithus pelagicus, abundant in the (sub) Arctic region, and the dominance of E. huxleyi type B/C and C in the SO contrasts with the dominance of E. huxleyi types A and B in the North Atlantic. Findings such as these cover existing gaps in an unexplored area of the SO as well as supporting previous research performed in neighboring areas. The current coccolithophore numbers and assemblage distribution in relation to the frontal dynamics of the SO provide valuable information for potential future paleoceanographic reconstructions.
description: Supplement to: Saavedra-Pellitero, Mariem; Baumann, Karl-Heinz; Flores, José-Abel; Gersonde, Rainer (2014): Biogeographic distribution of living coccolithophores in the Pacific sector of the Southern Ocean. Marine Micropaleontology, 109, 1-20
DOI: 10.1594/pangaea.915413
title: Biogeographic distribution of different extant coccolithophore taxa in the Pacific sector of the Southern Ocean

description: We investigated plankton samples collected during RV Polarstern cruise ANT-XXVI/2 (from 27th November 2009 to 27th January 2010) along a broad E-W transect in the Pacific sector of the SO during austral summer. One hundred and fifty samples from twenty-nine stations were collected from the upper 150 m of the water column. Coccospheres per liter were counted using a scanning electronmicroscope (SEM). The different extant coccolithophore taxa numbers and assemblage distribution in relation to the frontal dynamics of the SO provide valuable information for potential future paleoceanographic reconstructions.
DOI: 10.1594/pangaea.66930
title: Dinoflagellate assemblage in surface sediments of the South Atlantic
DOI: 10.1594/pangaea.913811
title: XRF data of D. striatus and W. britannica at 17 keV

description: The data were generated at ESRF beamline ID22 with an incident energy at 17 keV. Discorhdabus striatus and Watznaueria britannica were analyzed with 0.1 µm x 0.1 µm pixel size and 2 s time analysis per pixel. Both coccoliths were picked from samples from Murtinheira section at Cabo Mondego, Portugal. D. striatus is from sample CM9 and W. britannica from sample CM60 both dated to the lower Bajocian (Middle Jurassic). Sample position in the section in Suchéras-Marx et al. (2012). Data treatment is made using PyMCA. For each calcareous nannofossil, the raw data (.edf in .zip) and the pondered spectrum (.csv) are given. One fit file is given (.cfg) and can be used for both sample. Those data were acquired through the project EC811 at ESRF. Similar results published in Suchéras-Marx et al. (2016).
DOI: 10.1594/pangaea.186466
title: Geometry of coccolith Calcidiscus leptoporus in sediment core PS1113-1

description: measured on Calcidiscus leptoporus
DOI: 10.1594/pangaea.206402
title: Sedimentology and age control parameter of core PS1533-3

description: Georeference age is given in calendar years, calibrated with CALIB 4.3 (ud260603)
DOI: 10.1594/pangaea.381420
title: Radiosonde PS45/16264 during POLARSTERN cruise ARK-XIII/3 on 1997-09-13 09:52h

description: Height of tropopause 7466 m, precipitable water content 0.2972 cm
DOI: 10.1594/pangaea.783499
title: (Fig. 5) Bulk grain size mass frequencies of sediment core GeoB13071-1
DOI: 10.1594/pangaea.881457
title: Coccolith export fluxes from sediment trap M4U
DOI: 10.1594/pangaea.783480
title: (Fig. 6) Lithology of sediment core GeoB130206-1
DOI: 10.1594/pangaea.704632
title: (Table 3) Morphometric measurements of Neogloboquadrina pachyderma sin. from ODP Site 104-644 on the inner Voring Plateau

description: sampling size fraction 125-500 µm
DOI: 10.1594/pangaea.702106
title: (Table 1) Age determination and linear sedimentation rates of ODP Hole 104-644A in the Norwegian-Greenland Sea
DOI: 10.1594/pangaea.186473
title: Coccoliths in sediment core GIK23059-2
DOI: 10.1594/pangaea.746273
title: (Table S1) Relative abundances of coccolithophore taxa in surface sediment samples from the Equatorial and Southeastern Pacific

description: This study aims to contribute to a more detailed knowledge of the biogeography of coccolithophores in the Equatorial and Southeastern Pacific Ocean. Census data of fossil coccoliths are presented in a suite of core-top sediment samples from 15°N to 50.6°S and from 71°W to 93°W. Following standard preparation of smear slides, a total of 19 taxa are recognized in light microscopy and their relative abundances are determined for 134 surface sediment samples. Considering the multivariate character of oceanic conditions and their effects on phytoplankton, a Factor Analysis was performed and three factors were retained. Factor 1, dominated by Florisphaera profunda and Gephyrocapsa oceanica, includes samples located under warm water masses and indicates the occurrence of calcite dissolution in the water column in the area offshore Chile. Factor 2 is related to cold, low-salinity surface-water masses from the Chilean upwelling, and is dominated by Emiliania huxleyi, Gephyrocapsa sp. &lt; 3 µm, Coccolithus pelagicus and Gephyrocapsa muellerae. Factor 3 is linked to more saline, coastal upwelling areas where Calcidiscus leptoporus and Helicosphaera carteri are the dominant species.
description: preservation (VG = excellent, G = good, M = moderate, P = poor, ? = absence of coccoliths)
description: Supplement to: Saavedra-Pellitero, Mariem; Flores, José-Abel; Baumann, Karl-Heinz; Sierro, Francisco Javier (2010): Coccolith distribution patterns in surface sediments of Equatoral and Southeastern Pacific Ocean. Geobios, 43(1), 131-149
DOI: 10.1594/pangaea.807155
title: (Appendix A) Abundance of selected coccolithophores in sediment core DS97-2P, North Atlantic

description: The calcareous nannofossil assemblages from sediment core DS97-2P from the Reykjanes Ridge have been investigated to document oceanographic changes in surface water during the Holocene. The recorded variations in coccolithophore species assemblages and accumulation rates indicate that the region was subjected to rapid changes of surface water masses throughout the entire Holocene. Coccolithophore assemblages generally are of low species diversity and consist mainly of Emiliania huxleyi and Coccolithus pelagicus ssp. pelagicus. Two major events occurred at 8.5-7 ka and at 4.5-3.5 ka, showing higher coccolith accumulation rates, suggesting that the influence of relatively warm Atlantic waters via the Irminger Current was strong in the investigated area. The coccolithophore assemblages have been compared with diatom, foraminifer and sedimentological records within the same core. These data, supported by a comparison with previously published proxy records, add credit to the hypothesis that Holocene changes did not occur uniformly across the North Atlantic. The results have highlighted the Holocene pattern in the North Atlantic, as a period influenced by strong regionalism with discrepancies in the hydrographical trends and in the distribution of the planktonic proxies.
description: Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
description: Supplement to: Balestra, Barbara; Ziveri, Patrizia; Baumann, Karl-Heinz; Troelstra, Simon; Monechi, Simonetta (2010): Surface water dynamics in the Reykjanes Ridge area during the Holocene as revealed by coccolith assemblages. Marine Micropaleontology, 76(1-2), 1-10
DOI: 10.1594/pangaea.206412
title: Beryllium 10 analysis of sediment core PS2200-5 from the Arctic Ocean
DOI: 10.15468/dl.adbwpk
title: Occurrence Download

description: A dataset containing 3432 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Brazil",
 "TaxonKey is Crypturellus noctivagus (zu Wied-Neuwied, 1820)"
 ]
}

 The dataset includes 3432 records from 22 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0000209-250123221155621/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.1594/pangaea.881456
title: Coccolith export fluxes from sediment trap M2U
DOI: 10.1594/pangaea.921382
title: Downcore Florisphaera profunda
DOI: 10.1594/pangaea.867111
title: (Table 2) Fluxes of major primary and secondary producers/organisms (diatoms, diatom coastal : pelagic ratio, coccolithophores and planktonic foraminifera) for the upper CVOO-3 trap samples
DOI: 10.1594/pangaea.881484
title: Environmental parameters from sediment trap M4U
DOI: 10.1594/pangaea.873034
title: Stable isotopes, bromine, iodine, and sodium measured in surface snow of core GV7
DOI: 10.6084/m9.figshare.28267223
title: related data

description: The datas are described in the article
DOI: 10.6084/m9.figshare.28267223.v1
title: related data

description: The datas are described in the article
DOI: 10.1594/pangaea.381422
title: Radiosonde PS45/16266 during POLARSTERN cruise ARK-XIII/3 on 1997-09-15 05:27h

description: Height of tropopause 8714 m, precipitable water content 0.3174 cm
DOI: 10.1594/pangaea.783479
title: (Fig. 5) Lithology of sediment core GeoB13071-1
DOI: 10.1594/pangaea.68903
title: Sediment components of core L009/21

description: Ages corrected for an ocean reservoir age of 400 14C yr
DOI: 10.1594/pangaea.68905
title: Sediment components of core SO82-2

description: Ages corrected for an ocean reservoir age of 400 14C yr. Combined profile of SO82_2-1 (0-39cm) and SO82_2-2 (63cm=1cm of SO82_2-2).
DOI: 10.1594/pangaea.69499
title: Sediment components of core SO82-7

description: Ages corrected for an ocean reservoir age of 400 14C yr
DOI: 10.1594/pangaea.704631
title: (Table 3) Morphometric measurements of Neogloboquadrina pachyderma sin. from ODP Site 104-643 on the outer Voring Plateau

description: sampling size fraction 125-500 µm
DOI: 10.1594/pangaea.901288
title: Physical oceanography measuremets across the Drake Passage from CTD stations during POLARSTERN cruise PS97 (ANT-XXXI/3)
DOI: 10.1594/pangaea.702105
title: (Table 1) Age determination and linear sedimentation rates of ODP Hole 104-643A in the Norwegian-Greenland Sea
DOI: 10.1594/pangaea.774598
title: (Appendix A) Relative abundance of Emiliania huxleyi in sediment cores of the North Atlantic

description: The coccolithophore species Emiliania huxleyi is characterized by a wide range of sizes, which can be easily distinguished in the light microscope. In this study we have quantified the abundance of large (coccoliths &gt; 4 µm in maximum length) E. huxleyi specimens during the last 25 kyr in sedimentary records from eleven cores and drill sites in the NE Atlantic and W Mediterranean Sea, to prove its usefulness in the reconstruction of water mass dynamics and biostratigraphic potential.During the Last Glacial Maximum this large form, a cold-water indicator, was common in the NE Atlantic and Mediterranean, and its regional variation in abundance indicates a displacement of the climatic zones southwards in agreement with the development of ice sheets and sea ice in the Northern Hemisphere during this period. On the other hand, the gradient between northern and southern surface water masses in the Subtropical Gyre appears to have been more pronounced than at present, while the Portugal and Canary Currents were more intense. In the western Mediterranean basin temperatures were cooler than in the adjacent Atlantic, provoking a quasi-endemism of these specimens until the end of Heinrich Event 1. This may have been due to a restriction in the communication between the Atlantic and Mediterranean through the Strait of Gibraltar, the arrival of cold surface water and the amplification of cooling after the development of ice sheets in the Northern Hemisphere.During the deglaciation, large E. huxleyi specimens decreased in abundance at medium and low latitudes, but were still numerous close to the Subarctic region during the Holocene. In transitional waters this decrease to present day abundances occurred after Termination Ib.The abrupt change in abundance of this large E. huxleyi form is proposed as a new biostratigraphic event to characterize the Holocene in mid- to low-latitude water masses in the North Atlantic, although this horizon seems to be diachronous by 5 kyr from tropical to subarctic regions, in agreement with the gradual onset of warm conditions.
description: Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
description: Supplement to: Flores, José-Abel; Colmenero-Hidalgo, Elena; Mejía Molina, Alejandra E; Baumann, Karl-Heinz; Henderiks, Jorijntje; Larsson, Kristina; Prabhu, C N; Sierro, Francisco Javier; Rodrigues, Teresa (2010): Distribution of large Emiliania huxleyi in the Central and Northeast Atlantic as a tracer of surface ocean dynamics during the last 25,000 years. Marine Micropaleontology, 76(3-4), 53-66