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  • 1
    Electronic Resource
    Electronic Resource
    Stable sea surface temperatures in the western Pacific warm pool over the past 1.75 million years (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 433 (2005), S. 294-298 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] About 850,000 years ago, the period of the glacial cycles changed from 41,000 to 100,000 years. This mid-Pleistocene climate transition has been attributed to global cooling, possibly caused by a decrease in atmospheric carbon dioxide concentrations. However, evidence for such cooling is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03189
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    Paper (German National Licenses)
    Fulltext
  • 2
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    The FORCIS database: A global census of planktonic Foraminifera from ocean waters (2023)
    Springer
    Details
    Publication Date: 2024-02-07
    Description: Planktonic Foraminifera are unique paleo-environmental indicators through their excellent fossil record in ocean sediments. Their distribution and diversity are affected by different environmental factors including anthropogenically forced ocean and climate change. Until now, historical changes in their distribution have not been fully assessed at the global scale. Here we present the FORCIS (Foraminifera Response to Climatic Stress) database on foraminiferal species diversity and distribution in the global ocean from 1910 until 2018 including published and unpublished data. The FORCIS database includes data collected using plankton tows, continuous plankton recorder, sediment traps and plankton pump, and contains similar to 22,000, similar to 157,000, similar to 9,000, similar to 400 subsamples, respectively (one single plankton aliquot collected within a depth range, time interval, size fraction range, at a single location) from each category. Our database provides a perspective of the distribution patterns of planktonic Foraminifera in the global ocean on large spatial (regional to basin scale, and at the vertical scale), and temporal (seasonal to interdecadal) scales over the past century.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    The cryptic and the apparent reversed: lack of genetic differentiation within the morphologically diverse plexus of the planktonic foraminifer Globigerinoides sacculifer (2013)
    Paleontological Society
    Details
    Publication Date: 2013-01-01
    Description: Previous genetic studies of extant planktonic foraminifera have provided evidence that the traditional, strictly morphological definition of species in these organisms underestimates their biodiversity. Here, we report the first case where this pattern is reversed. The modern (sub)tropical species plexus Globigerinoides sacculifer is characterized by large morphological variability, which has led to the proliferation of taxonomic names attributed to morphological end-members within the plexus. In order to clarify the taxonomic status of its morphotypes and to investigate the genetic connectivity among its currently partly disjunct (sub)tropical populations, we carried out a global survey of two ribosomal RNA regions (SSU and ITS-1) in all recent morphotypes of the plexus collected throughout (sub)tropical surface waters of the global ocean. Unexpectedly, we find an extremely reduced genetic variation within the plexus and no correlation between genetic and morphological divergence, suggesting taxonomical overinterpretation. The genetic homogeneity within the morphospecies is unexpected, considering its partly disjunct range in the (sub)tropical Atlantic and Indo-Pacific and its old age (early Miocene). A sequence variant in the rapidly evolving ITS-1 region indicates the existence of an exclusively Atlantic haplotype, which suggests an episode of relatively recent (last glacial) isolation, followed by subsequent resumption of unidirectional gene flow from the Indo-Pacific into the Atlantic. This is the first example in planktonic foraminifera where the morphological variability in a morphospecies exceeds its rDNA genetic variability. Such evidence for inconsistent scaling of morphological and genetic diversity in planktonic foraminifera could complicate the interpretation of evolutionary patterns in their fossil record.
    Print ISSN: 0094-8373
    Electronic ISSN: 0094-8373
    Topics: Geosciences
    Published by Paleontological Society
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    PAPER CURRENT
  • 4
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    (Table 1) Age determination of sediment core MD97-2141
    PANGAEA
    In:  Supplement to: de Garidel-Thoron, Thibault; Beaufort, Luc; Linsley, Braddock K; Dannenmann, Stefanie (2001): Millennial-scale dynamics of the east Asian winter monsoon during the last 200,000 years. Paleoceanography, 16(5), 491-502, https://doi.org/10.1029/2000PA000557
    Details
    Publication Date: 2023-06-27
    Description: The primary productivity dynamics of the last 200,000 years in the Sulu Sea was reconstructed using the abundance of the coccolithophore Florisphaera profunda in the IMAGES MD97-2141 core. We find that primary productivity was enhanced during glacial periods, which we suggest is due to a stronger East Asian winter monsoon. During the last 80 kyr, eight significant increases in primary productivity (PP) in the Sulu Sea are similar to East Asian winter monsoon changes recorded in Chinese loess. The PP maxima are not linked with Heinrich events (HE) in the North Atlantic, although four PP peaks are synchronous with HE. The PP oscillations have frequencies near those of the Dansgaard-Oeschger cycles in Northern Hemisphere ice records and indicate a teleconnection of the East Asian winter monsoon with Greenland climate. In this Sulu Sea record the East Asian winter monsoon oscillates with periodicities of ~6, 4.2-3.4, 2.3, and 1.5 kyr. In particular, the 1.5 kyr cycle exhibits a strong and pervasive signal from stage 6 to the Holocene without any ice volume modulation. This stationarity suggests that the 1.5 kyr cycle is not driven by some high-latitude forcing.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES III - IPHIS; Laboratory code/label; Marion Dufresne (1995); MD106; MD972141; MD97-2141
    Type: Dataset
    Format: text/tab-separated-values, 162 data points
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    DATA PANGAEA
  • 5
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    Surface and permanent pycnocline temperatures and seawater δ¹⁸O based on paired Mg/Ca-d18O, and abundances of Neogloboquadrina atlantica from ~2.8-2.4 Ma at IODP Site U1313 in the mid-latitude North Atlantic (2018)
    PANGAEA
    In:  Supplement to: Bolton, Clara T; Bailey, Ian; Friedrich, Oliver; Tachikawa, Kazuyo; de Garidel-Thoron, Thibault; Vidal, Laurence; Sonzogni, Corinne; Marino, Gianluca; Rohling, Eelco J; Robinson, Marci M; Ermini, Magali; Koch, Mirjam C; Cooper, Matthew J; Wilson, Paul A (2018): North Atlantic Midlatitude Surface‐Circulation Changes Through the Plio‐Pleistocene Intensification of Northern Hemisphere Glaciation. Paleoceanography and Paleoclimatology, 33(11), 1186-1205, https://doi.org/10.1029/2018PA003412
    Details
    Publication Date: 2023-07-05
    Description: The North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is widely suggested for the last glacial maximum (LGM) and may have acted as a positive feedback in glacial expansion at this time. However, the role of the NAC during the intensification of northern hemisphere glaciation (iNHG) ~3.5 to 2.5 Ma, is less clear. Here, we present new records from IODP Site U1313 (41°N) spanning ~2.8-2.4 Ma to trace the influence of Subarctic Front waters above this mid-latitude site. We reconstruct surface and permanent pycnocline temperatures and seawater δ18O using paired Mg/Ca-δ18O measurements on the planktic foraminifers Globigerinoides ruber and Globorotalia crassaformis, and determine abundances of the subpolar foraminifer Neogloboquadrina atlantica. We find that the first significant glacial incursions of Subarctic Front surface waters above Site U1313 did not occur until ~2.6 Ma. At no time during our study interval was (sub)surface reorganisation in the mid-latitude North Atlantic analogous to the LGM. Our findings suggest that LGM-like processes sensu stricto cannot be invoked to explain interglacial-glacial cycle amplification during iNHG. They also imply that increased glacial productivity at Site U1313 during iNHG was not only driven by southward deflections of the Subarctic Front. We suggest nutrient injection from cold-core eddies and enhanced glacial dust delivery may have played additional roles in increasing export productivity in the mid-latitude North Atlantic from 2.7 Ma.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 6
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    Age analysis and Neogloboquadrina atlantica counts from IODP Site 306-U1313 (2018)
    PANGAEA
    Details
    Publication Date: 2023-12-02
    Keywords: 306-U1313; after Bolton etal., 2010; AGE; COMPCORE; Composite Core; Counting 〉150 µm fraction; Depth, composite; Exp306; Foraminifera, planktic, other; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Neogloboquadrina atlantica; North Atlantic Climate 2; Sample comment
    Type: Dataset
    Format: text/tab-separated-values, 789 data points
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    DATA PANGAEA
  • 7
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    Age analysis and geochemistry of Globorotalia crassaformis and Globigerinoides ruber from IODP Site 306-U1313 (2018)
    PANGAEA
    Details
    Publication Date: 2023-12-02
    Keywords: 306-U1313; after Bolton etal., 2010; AGE; COMPCORE; Composite Core; Depth, composite; Exp306; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, δ18O; Globorotalia crassaformis, Magnesium/Calcium ratio; Globorotalia crassaformis, δ18O; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; North Atlantic Climate 2; Sea surface temperature; Thermocline water temperature
    Type: Dataset
    Format: text/tab-separated-values, 6707 data points
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    DATA PANGAEA
  • 8
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    (Table 2) Age determination of sediment core MD97-2138 (2007)
    PANGAEA
    In:  Supplement to: de Garidel-Thoron, Thibault; Rosenthal, Yair; Beaufort, Luc; Bard, Edouard; Sonzogni, Corinne; Mix, Alan C (2007): A multiproxy assessment of the western equatorial Pacific hydrography during the last 30 kyr. Paleoceanography, 22(3), PA3204, https://doi.org/10.1029/2006PA001269
    Details
    Publication Date: 2023-11-25
    Description: Sea surface temperature (SST) and salinity of the Western Pacific Warm Pool (WPWP) reflect global climate effects such as the El Niño-Southern Oscillation phenomenon. However, reconstructions of past changes in the WPWP from the geologic record vary depending on the specific proxy record used. Here we develop a multiproxy record of the last deglaciation from a radiocarbon-dated sediment core (MD97-2138) retrieved in the heart of the WPWP. SST reconstructions for the past 30,000 years based on planktonic foraminiferal Mg/Ca (Globigerinoides ruber and Globigerinoides sacculifer), alkenone unsaturation index, and foraminiferal transfer functions differ notably. Mg/Ca-based SST estimates from the surface dwelling species G. ruber in MD97-2138 indicate a larger surface cooling (3° ± 0.6°C) during the Last Glacial Maximum (LGM) than inferred from Mg/Ca ratios in G. sacculifer (2.3° ± 0.7°C), statistical transfer functions based on planktonic foraminiferal species assemblages, and UK37' (1°-2°C). These estimates are consistent with estimates from other WPWP cores, thereby suggesting that the discrepancy is due to proxy compatibility rather than differences in cores qualitity. Postdepositional dissolution above the lysocline might have altered the Mg/Ca-based temperature estimates in our site, but this effect is insufficient to resolve discrepancies between Mg/Ca in G. ruber and the other proxies. We suggest that the lower estimates obtained from Mg/Ca in G. sacculifer, faunal transfer functions, and Uk37' might reflect subsurface temperature changes rather than strict surface estimates. Accounting for potential artefacts, including dissolution and bioturbation, we suggest that the glacial WPWP SST was about 2.5° ± 0.7°C cooler than during the Holocene, whereas the subsurface/upper thermocline temperature change was only about 1.8° ± 0.7°C. Interpreting variations in d18OSW in terms of salinity changes suggests a possibly slight decrease in surface salinity at the site of MD97-2138 during the LGM. Though LGM freshening in MD97-2138 is not robust to postdeposition dissolution effects, this inferred freshening appears to be a general feature of the western equatorial Pacific.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; CALYPSO; Calypso Corer; DEPTH, sediment/rock; IMAGES III - IPHIS; Laboratory code/label; Marion Dufresne (1995); MD106; MD972138; MD97-2138
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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    DATA PANGAEA
  • 9
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    Seawater carbonate chemistry and Emiliania huxleyi mass and size, 2011 (2011)
    PANGAEA
    In:  Supplement to: Beaufort, Luc; Probert, Ian; de Garidel-Thoron, Thibault; Bendif, E M; Ruiz-Pino, Diana; Metzi, N; Goyet, Catherine; Buchet, Noëlle; Coupel, Pierre; Grelaud, Michaël; Rost, Björn; Rickaby, Rosalind E M; De Vargas, Colomban (2011): Sensitivity of coccolithophores to carbonate chemistry and ocean acidification. Nature, 476, 80-83, https://doi.org/10.1038/nature10295
    Details
    Publication Date: 2024-03-15
    Description: About one-third of the carbon dioxide (CO2) released into the atmosphere as a result of human activity has been absorbed by the oceans, where it partitions into the constituent ions of carbonic acid. This leads to ocean acidification, one of the major threats to marine ecosystems and particularly to calcifying organisms such as corals, foraminifera and coccolithophores. Coccolithophores are abundant phytoplankton that are responsible for a large part of modern oceanic carbonate production. Culture experiments investigating the physiological response of coccolithophore calcification to increased CO2 have yielded contradictory results between and even within species. Here we quantified the calcite mass of dominant coccolithophores in the present ocean and over the past forty thousand years, and found a marked pattern of decreasing calcification with increasing partial pressure of CO2 and concomitant decreasing concentrations of CO3. Our analyses revealed that differentially calcified species and morphotypes are distributed in the ocean according to carbonate chemistry. A substantial impact on the marine carbon cycle might be expected upon extrapolation of this correlation to predicted ocean acidification in the future. However, our discovery of a heavily calcified Emiliania huxleyi morphotype in modern waters with low pH highlights the complexity of assemblage-level responses to environmental forcing factors.
    Keywords: Age, dated; Alkalinity, total; Antarctic; Aragonite saturation state; Bicarbonate ion; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; CTD, Sea-Bird SBE 911plus; Emiliania huxleyi; Emiliania huxleyi, diameter; Emiliania huxleyi, weight; Emiliania huxleyi, weight, standard error; EPOCA; Estimated by measuring brightness in cross-polarized light (birefringence); EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Indian Ocean; LATITUDE; LONGITUDE; Measured and/or detected by SYRACO software; North Atlantic; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Phytoplankton; Replicates; Salinity; Sample ID; South Atlantic; South Pacific; Temperature, water; Titration potentiometric
    Type: Dataset
    Format: text/tab-separated-values, 16400 data points
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    DATA PANGAEA
  • 10
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    Machine learning techniques to characterize functional traits of plankton from image data (2022)
    Association for the Sciences of Limnology and Oceanography
    Details
    Publication Date: 2022-10-18
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Orenstein, E., Ayata, S., Maps, F., Becker, É., Benedetti, F., Biard, T., Garidel‐Thoron, T., Ellen, J., Ferrario, F., Giering, S., Guy‐Haim, T., Hoebeke, L., Iversen, M., Kiørboe, T., Lalonde, J., Lana, A., Laviale, M., Lombard, F., Lorimer, T., Martini, S., Meyer, A., Möller, K.O., Niehoff, B., Ohman, M.D., Pradalier, C., Romagnan, J.-B., Schröder, S.-M., Sonnet, V., Sosik, H.M., Stemmann, L.S., Stock, M., Terbiyik-Kurt, T., Valcárcel-Pérez, N., Vilgrain, L., Wacquet, G., Waite, A.M., & Irisson, J. Machine learning techniques to characterize functional traits of plankton from image data. Limnology and Oceanography, 67(8), (2022): 1647-1669, https://doi.org/10.1002/lno.12101.
    Description: Plankton imaging systems supported by automated classification and analysis have improved ecologists' ability to observe aquatic ecosystems. Today, we are on the cusp of reliably tracking plankton populations with a suite of lab-based and in situ tools, collecting imaging data at unprecedentedly fine spatial and temporal scales. But these data have potential well beyond examining the abundances of different taxa; the individual images themselves contain a wealth of information on functional traits. Here, we outline traits that could be measured from image data, suggest machine learning and computer vision approaches to extract functional trait information from the images, and discuss promising avenues for novel studies. The approaches we discuss are data agnostic and are broadly applicable to imagery of other aquatic or terrestrial organisms.
    Description: SDA acknowledges funding from CNRS for her sabbatical in 2018–2020. Additional support was provided by the Institut des Sciences du Calcul et des Données (ISCD) of Sorbonne Université (SU) through the support of the sponsored junior team FORMAL (From ObseRving to Modeling oceAn Life), especially through the post-doctoral contract of EO. JOI acknowledges funding from the Belmont Forum, grant ANR-18-BELM-0003-01. French co-authors also wish to thank public taxpayers who fund their salaries. This work is a contribution to the scientific program of Québec Océan and the Takuvik Joint International Laboratory (UMI3376; CNRS - Université Laval). FM was supported by an NSERC Discovery Grant (RGPIN-2014-05433). MS is supported by the Research Foundation - Flanders (FWO17/PDO/067). FB received support from ETH Zürich. MDO is supported by the Gordon and Betty Moore Foundation and the U.S. National Science Foundation. ECB is supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) under the grant agreement no. 88882.438735/2019-01. TB is supported by the French National Research Agency (ANR-19-CE01-0006). NVP is supported by the Spanish State Research Agency, Ministry of Science and Innovation (PTA2016-12822-I). FL is supported by the Institut Universitaire de France (IUF). HMS was supported by the Simons Foundation (561126) and the U.S. National Science Foundation (CCF-1539256, OCE-1655686). Emily Peacock is gratefully acknowledged for expert annotation of IFCB images. LS was supported by the Chair VISION from CNRS/Sorbonne Université.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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    PAPER (OA)
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