Consulta: subjectFacets:"Iceland"
Registros recuperados: 17
Data/hora: 05/06/2024 13:56:25

Re-evaluation and extension of the Marine Isotope Stage 5 tephrostratigraphy of the Faroe Islands region: The cryptotephra record
Provedor de dados: 5
Autores: Abbott, P. M.; Austin, W. E. N.; Davies, S. M.; Pearce, N. J. G.; Rasmussen, T. L.; Wastegard, S.; Brendryen, J.
Previous studies of marine sequences from the Faroe Islands region have identified a series of coarse-grained tephra horizons deposited during Marine Isotope Stage (MIS) 5. Here we reassess the MIS 5 tephrostratigraphy of the Faroe Islands region and focus on the cryptotephra deposits preserved within the fine-grained fraction of marine core LINK 16. We also extend the record to encompass the late MIS 6 and early MIS 4 periods. A density separation technique, commonly used for tephra investigations in lacustrine settings but rarely applied to marine sediments, is utilised to explore the fine-grained material and EPMA and LA-ICP-MS are employed to determine the major and trace element composition of individual tephra shards. In total, 3 basaltic and 3...
Tipo: Text
Palavras-chave: Volcanic ash; Iceland; Marine sequences; Isochrons; Palaeoclimatic synchronisation.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00290/40096/38832.pdf

Cryptotephrochronology of the Eemian and the last interglacial-glacial transition in the North East Atlantic
Provedor de dados: 5
Autores: Abbott, Peter M.; Austin, William E. N.; Davies, Siwan M.; Pearce, Nicholas J. G.; Hibbert, Fiona D.
The Eemian interglacial and the onset of the subsequent glacial period serve as the most recent analogue for the natural operation of the climate system during the current interglacial. Pronounced climatic oscillations occurred during this period, but their nature and pattern are poorly understood due to dating limitations and unknown phase relationships between different regions and archives. Tephrochronology offers considerable potential for precise correlation of disparate palaeoclimatic archives preserving evidence of these rapid climatic transitions through the tracing of common isochronous tephra horizons. We outline the identification of three previously unknown cryptotephra horizons within a marine core from the Rockall Trough, North East Atlantic....
Tipo: Text
Palavras-chave: Cryptotephra; Iceland; Isochrons; Palaeoclimatic correlation; Volcanic ash.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00264/37517/35822.pdf

A comparative review of fisheries management experiences in the European Union and in other countries worldwide: Iceland, Australia, and New Zealand
Provedor de dados: 5
Autores: Marchal, Paul; Andersen, Jesper Levring; Aranda, Martin; Fitzpatrick, Mike; Goti, Leyre; Guyader, Olivier; Haraldsson, Gunnar; Hatcher, Aaron; Hegland, Troels Jacob; Le Floc H, Pascal; Macher, Claire; Malvarosa, Loretta; Maravelias, Christos D.; Mardle, Simon; Murillas, Arantza; Nielsen, J. Rasmus; Sabatella, Rosaria; Smith, Anthony D. M.; Stokes, Kevin; Thoegersen, Thomas; Ulrich, Clara.
This study compares the details and performance of fisheries management between the EU and a selection of other countries worldwide: Iceland, New Zealand, and Australia, which are considered in many respects to be among the most advanced in the world in fisheries management. Fisheries management in the EU, Iceland, Australia, and New Zealand has developed following different paths, despite being based on similar instruments and principles. Iceland, Australia, and New Zealand have been at the forefront of developing management practices such as stakeholder involvement, legally binding management targets (Australia, New Zealand), individual transferable quotas, and discard bans (Iceland, New Zealand). The EU has since the beginning of the 21st century taken...
Tipo: Text
Palavras-chave: Australia; Comparative review; European Union; Fisheries management; Iceland; New Zealand.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00312/42305/41699.pdf

Morphological and Molecular Characterisation of Three New Azadinium Species (Amphidomataceae, Dinophyceae) from the Irminger Sea
Provedor de dados: 5
Autores: Tillmann, Urban; Gottschling, Marc; Nezan, Elisabeth; Krock, Bernd; Bilien, Gwenael.
Some species of the planktonic dinoflagellate genus Azadinium produce azaspiracids (AZAs), a group of lipophilic phycotoxins causing human poisoning after mussel consumption. We describe three new species from the North Atlantic, all of which shared the same Kofoidean plate pattern characteristic for Azadinium: Po, cp, X, 4′, 3a, 6′́, 6 C, 5S, 6′́́, 2′́́́. Azadinium trinitatum sp. nov. was mainly characterized by the presence of an antapical spine and by the position of the ventral pore at the left distal end of the pore plate in a cavity of Plate 1′ Plate 1. Azadinium cuneatum sp. nov. had a conspicuously formed first apical plate, which was asymmetrically elongated and tapered on its left lateral side with a ventral pore located at the tip of this...
Tipo: Text
Palavras-chave: Azadinium; Azaspiracids; Irminger Sea; Iceland; New species.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29917/28382.pdf

31P-NMR Metabolomics Revealed Species-Specific Use of Phosphorous in Trees of a French Guiana Rainforest
Provedor de dados: 5
Autores: Gargallo-garriga, Albert; Sardans, Jordi; Llusià, Joan; Peguero, Guille; Asensio, Dolores; Ogaya, Romà; Urbina, Ifigenia; Langenhove, Leandro Van; Verryckt, Lore T.; Courtois, Elodie A.; Stahl, Clément; Grau, Oriol; Urban, Otmar; Janssens, Ivan A.; Nolis, Pau; Pérez-trujillo, Miriam; Parella, Teodor; Peñuelas, Josep.
Productivity of tropical lowland moist forests is often limited by availability and functional allocation of phosphorus (P) that drives competition among tree species and becomes a key factor in determining forestall community diversity. We used non-target 31P-NMR metabolic profiling to study the foliar P-metabolism of trees of a French Guiana rainforest. The objective was to test the hypotheses that P-use is species-specific, and that species diversity relates to species P-use and concentrations of P-containing compounds, including inorganic phosphates, orthophosphate monoesters and diesters, phosphonates and organic polyphosphates. We found that tree species explained the 59% of variance in 31P-NMR metabolite profiling of leaves. A principal component...
Tipo: Text
Palavras-chave: P-31-NMR metabolic profiling; Iceland; Tropical lowland; P-containing compounds; Species-specific P-use niches.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00648/76023/76922.pdf

Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70 degrees N) to the N Iceland shelves: detecting and modelling changing sediment sources
Provedor de dados: 5
Autores: Andrews, John T.; Bigg, Grant R.; Wilton, David J.
We examine variations in the ice-rafted sources for sediments in the Iceland/East Greenland offshore marine archives by utilizing a sediment unmixing model and link the results to a coupled iceberg-ocean model. Surface samples from around Iceland and along the E/NE Greenland shelf are used to define potential sediment sources, and these are examined within the context of the down-core variations in mineralogy in the &lt;2 mm sediment fraction from a transect of cores across Denmark Strait. A sediment unmixing model is used to estimate the fraction of sediment &lt;2 mm off NW and N Iceland exported across Denmark Strait; this averaged between 10 and 20%. Both the sediment unmixing model and the coupled iceberg-ocean model are consistent in finding that the...
Tipo: Text
Palavras-chave: Holocene; Ice-rafting; Ice bergs; East Greenland; Iceland.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00290/40150/39091.pdf

A North Atlantic tephrostratigraphical framework for 130-60 ka b2k: new tephra discoveries, marine-based correlations, and future challenges
Provedor de dados: 5
Autores: Davies, Siwan M.; Abbott, Peter M.; Meara, Rhian H.; Pearce, Nicholas J. G.; Austin, William E. N.; Chapman, Mark R.; Svensson, Anders; Bigler, Matthias; Rasmussen, Tine L.; Rasmussen, Sune O.; Farmer, Elizabeth J.
Building chronological frameworks for proxy sequences spanning 130-60 ka b2k is plagued by difficulties and uncertainties. Recent developments in the North Atlantic region, however, affirm the potential offered by tephrochronology and specifically the search for cryptotephra. Here we review the potential offered by tephrostratigraphy for sequences spanning 130-60 ka b2k. We combine newly identified cryptotephra deposits from the NGRIP ice-core and a marine core from the Iceland Basin with previously published data from the ice and marine realms to construct the first tephrostratigraphical framework for this time-interval. Forty-three tephra or cryptotephra deposits are incorporated into this framework; twenty three tephra deposits are found in the...
Tipo: Text
Palavras-chave: Tephra; Cryptotephra; Tephrostratigraphy; Greenland ice-cores; North Atlantic marine cores; Iceland; Tephra correlations; Glass-shard analysis; Rapid climate changes.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00289/40029/39255.pdf

La pêche à la morue
Provedor de dados: 5
Autores: Bronkhorst, L.
Tipo: Text
Palavras-chave: Newfounfland; West African zone; Iceland; Geographic zones; Fishing gear; Fleet; Fisheries; Gadidae; Mauritanie; Terre  neuve; Islande; Engin pêche; Flottille; Peche; Gadidae.
Ano: 1927
URL: https://archimer.ifremer.fr/doc/1927/publication-2205.pdf

Volcanoes and climate: the triggering of preboreal Jökulhlaups in Iceland
Provedor de dados: 5
Autores: Van Vliet-lanoë, Brigitte; Knudsen, Oskar; Guðmundsson, Agust; Guillou, Hervé; Chazot, Gilles; Langlade, Jessica; Liorzou, Celine; Nonnotte, Philippe.
The Early Holocene (12–8.2 cal ka) deglaciation and pulsed warming was associated in Iceland with two major generations of jökulhlaups around the Vatna ice-cap (Vatnajökull), at ca 11.4–11.2 cal ka and ca 10.4–9.9 cal ka, and major tephra emissions from the Grímsvötn and Bárðarbunga subglacial volcanoes. The earliest flood events were recorded inland during the Middle Younger Dryas and their deposits were overlain by the Early Preboreal Vedde Ash (11.8 cal ka). The first Holocene flood events (ca 11.4–11.2 cal ka) are issued from a glacial advance. The second, and major, set of floods was partly driven by the Erdalen cold events and advances (10.1–9.7 10Be ka) initially issued from the Bárðarbunga (10.4, 10.1–9.9 ka) and Grímsvötn volcanoes (Saksunarvatn...
Tipo: Text
Palavras-chave: Holocene; Deglaciation; Iceland; Geomorphology; Glacial; Flood; Sedimentology; Tephra; Glacio-isostatic rebound; Permafrost; Saksunarvatn event; Askja S.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00613/72489/74845.pdf

A robust, multisite Holocene history of drift ice off northern Iceland: implications for North Atlantic climate
Provedor de dados: 5
Autores: Andrews, John T.; Darby, Dennis; Eberle, Dennis; Jennings, Anne E.; Moros, Matthias; Ogilvie, Astrid.
An important indicator of Holocene climate change is provided by evidence for variations in the extent of drift ice. A proxy for drift ice in Iceland waters is provided by the presence of quartz. Quantitative x-ray diffraction analysis of the &lt; 2 mm sediment fraction was undertaken on 16 cores from around Iceland. The quartz weight (wt.)% estimates from each core were integrated into 250-yr intervals between -0.05 and 11.7 cal. ka BP. Median quartz wt.% varied between 0.2 and 3.4 and maximum values ranged between 2.8 and 11.8 wt.%. High values were attained in the early Holocene and minimum values were reached 6 7 cal. ka BP. Quartz wt.% then rose steadily during the late Holocene. Our data exhibit no correlation with counts on haematite-stained quartz...
Tipo: Text
Palavras-chave: Ice rafted debris; Iceland; Quartz; Drift ice; Holocene; Arctic basin.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00218/32943/31420.pdf

Two “pillars” of cold-water coral reefs along Atlantic European margins: Prevalent association of Madrepora oculata with Lophelia pertusa, from reef to colony scale
Provedor de dados: 5
Autores: Arnaud-haond, Sophie; Van Den Beld, Inge; Becheler, Ronan; Orejas, C.; Menot, Lenaick; Frank, N.; Grehan, A.; Bourillet, Jean-francois.
The scleractinian coral Lophelia pertusa has been the focus of deep-sea research since the recognition of the vast extent of coral reefs in North Atlantic waters two decades ago, long after their existence was mentioned by fishermen. These reefs where shown to provide habitat, concentrate biomass and act as feeding or nursery grounds for many species, including those targeted by commercial fisheries. Thus, the attention given to this cold-water coral (CWC) species from researchers and the wider public has increased. Consequently, new research programs triggered research to determine the full extent of the corals geographic distribution and ecological dynamics of “Lophelia reefs”. The present study is based on a systematic standardised sampling design to...
Tipo: Text
Palavras-chave: Lophelia pertusa; Madrepora oculata; False-chimaera colonies; Cold water corals (CWC); Bay of Biscay; Ireland; Iceland.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00274/38530/37048.pdf

Monsoon variability and deep oceanic circulation in the western equatorial Pacific over the last climatic cycle: Insights from sedimentary magnetic properties and sortable silt
Provedor de dados: 5
Autores: Kissel, Catherine; Laj, Carlo; Kienast, Markus; Bolliet, Timothe; Holbourn, Ann; Hill, Paul; Kuhnt, Wolfgang; Braconnot, Pascale.
Magnetic and grain size properties of a sediment core located in the western equatorial Pacific, off the southeastern tip of the Philippine island of Mindanao, are presented in an effort to reconstruct past changes in the East Asian Monsoon and deep ocean circulation during the last 160 kyrs. The sedimentary concentration of magnetic particles, interpreted to reflect past changes in runoff from Mindanao, varies almost in antiphase with Northern Hemisphere insolation. This suggests that precipitation was lower in the western equatorial Pacific region during boreal insolation maxima and thus corroborates model results showing opposing trends in precipitation between land and the marine realm there. Variations in the grain size distribution of the inorganic...
Tipo: Text
Palavras-chave: North atlantic; Grain size; Water; Core; Mindanao; Paleoceanography; Susceptibility; Anisotropy; Remanence; Iceland.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00207/31854/30262.pdf

Last glacial period cryptotephra deposits in an eastern North Atlantic marine sequence: Exploring linkages to the Greenland ice-cores
Provedor de dados: 5
Autores: Abbott, P. M.; Bourne, A. J.; Purcell, C. S.; Davies, S. M.; Scourse, J. D.; Pearce, N. J. G.
The establishment of a tephra framework for the Greenland ice-cores spanning the last glacial period, particularly between 25 and 45 Ica b2k, provides strong potential for precisely correlating other palaeoclimatic records to these key archives. Tephra-based synchronisation allows the relative timing of past climatic changes recorded within different depositional environments and potential causal mechanisms to be assessed. Recent studies of North Atlantic marine records have demonstrated the potential of tracing cryptotephra horizons in these sequences and the development of protocols now allows a careful assessment of the isochronous nature of such horizons. Here we report on tephrochronological investigations of a marine sequence retrieved from the Goban...
Tipo: Text
Palavras-chave: Tephrochronology; Palaeoclimate synchronisation; Volcanic ash; Isochrons; Iceland; Major and trace element geochemistry.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00421/53274/83380.pdf

Abrupt climate changes for Iceland during the last millennium: Evidence from high resolution sea ice reconstructions
Provedor de dados: 5
Autores: Masse, Guillaume; Rowland, Steven J.; Sicre, Marie-alexandrine; Jacob, Jeremy; Jansen, Eystein; Belt, Simon T.
A high resolution account of Icelandic sea ice over the last millennium has been constructed using a novel proxy based on the presence in sediments of a biomarker (IP25) produced by sea ice algae. Comparison with historical sea ice records demonstrates a strong correlation between documented sea ice Occurrences and the IP25 proxy. An excellent agreement is also observed between the IP25 record and a diatom-based sea surface temperature reconstruction obtained from the same core and the Crowley and Lowery Northern Hemisphere temperature reconstruction. Using this approach, we provide new historical sea ice data for periods where records are scarce or absent and evidence for abrupt changes to sea ice and/or climate conditions around Iceland during the Little...
Tipo: Text
Palavras-chave: Highly branched isoprenoid alkenes; Sea ice; Iceland; Sediments.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00237/34839/33273.pdf

Sea-level changes in Iceland and the influence of the North Atlantic Oscillation during the last half millennium
Provedor de dados: 5
Autores: Saher, Margot H.; Gehrels, W. Roland; Barlow, Natasha L. M.; Long, Antony J.; Haigh, Ivan D.; Blaauw, Maarten.
We present a new, diatom-based sea-level reconstruction for Iceland spanning the last similar to 500 years, and investigate the possible mechanisms driving the sea-level changes. A sea-level reconstruction from near the Icelandic low pressure system is important as it can improve understanding of ocean atmosphere forcing on North Atlantic sea-level variability over multi-decadal to centennial timescales. Our reconstruction is from Vioarholmi salt marsh in Snafellsnes in western Iceland, a site from where we previously obtained a 2000-yr record based upon less precise sea-level indicators (salt-marsh foraminifera). The 20th century part of our record is corroborated by tide-gauge data from Reykjavik. Overall, the new reconstruction shows ca 0.6 m rise of...
Tipo: Text
Palavras-chave: Diatoms; Ocean dynamics; Iceland; Little Ice Age; Sea-level rise; NAO.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00352/46283/45963.pdf

Pectinoidea (Mollusca: Bivalvia) from Iceland
Provedor de dados: 16
Autores: Dijkstra, H.H.; Waren, A.; Gudmundsson, G.
The Icelandic pectinoid fauna is reviewed, based on material from the benthic survey programme BIOICE and 17 species are recorded. Similipecten oskarssoni is proposed as a replacement name for Pecten groenlandicus var. minor Locard, 1898 (Propeamussiidae), which is considered a valid species. Lectotypes are designated for Pecten groenlandicus var. minor and Pecten frigidus Jensen, 1904 (Pectinidae). Cyclopecten ambiannulatus Schein, 1989, Parvamussium propinquum (Smith, 1885), Catillopecten eucymatus (Dall, 1898), and Aequipecten opercularis (Linnaeus, 1758) were previously not known from the Icelandic fauna. All species are figured and described and distinguishing characters are discussed. The distribution in Scandinavian and North Atlantic waters is...
Tipo: Article / Letter to the editor
Palavras-chave: Pectinoidea; Taxonomy; New species; North Atlantic; Iceland; BIOICE; 42.73.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/410534

Notes sur les Céphalopodes: X. Sur quelques Céphalopodes de la mer d'Islande
Provedor de dados: 27
Autores: Adam, W.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cephalopoda ANE; Iceland.
Ano: 1939
URL: http://www.vliz.be/imisdocs/publications/297362.pdf