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  • Artikel  (7)
  • Artikel (Open Access)  (7)
  • 1
    Publikationsdatum: 2019-07-17
    Beschreibung: Calcium carbonate precipitation in sea ice is thought to potentially drive significant CO2 uptake by the ocean. However, little is known about the quantitative spatial and temporal distribution of CaCO3 within sea ice, although it is hypothesized that high quantities of dissolved organic matter and/or phosphate (common in sea ice) may inhibit its formation. In this quantitative study of hydrous calcium carbonate as ikaite, sea ice cores and brine samples were collected from pack and land fast sea ice between September and December 2007 during two expeditions, one in the East Antarctic sector and the other off Terre Ade´lie. Samples were analysed for CaCO3, salinity, dissolved organic carbon/nitrogen, inorganic phosphate, and total alkalinity. No relationship between these parameters and CaCO3 precipitation was evident. Ikaite was found mostly in the uppermost layers of sea ice with maximum concentrations of up to 126 mg ikaite per litre melted sea ice being measured, although both the temporal and horizontal spatial distributions of ikaite were highly heterogeneous. The precipitate was also found in the snow on top of the sea ice at some of the sampling locations.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Magnolia Press
    In:  EPIC3Phytotaxa, Magnolia Press, 227(2), pp. 101-119, ISSN: 1179-3155
    Publikationsdatum: 2019-07-17
    Beschreibung: Several diatoms in the family Achnanthaceae (Bacillariophyta), mainly from marine environments, have species with strongly apiculate, lemon-shaped valves. Some of them originally described under the genus Cocconeis (i.e., C. trachyderma or C. citronella), while others were first described as Stauroneis species [i.e. Stauroneis apiculata or S.(?) obesa]. Afterwards, Cocconeis citronella has been recombined within Achnanthes by Hustedt. The type material of C. citronella from Albert Mann’s collection, housed in the Smithsonian Institution (US), has been examined with light microscope; some ambiguities are pointed out and new details added to the original description. The intricate history of the latter taxon is redrawn and comparison with allied taxa are tentatively addressed. Cocconeis trachyderma is lectotypified and recombined as Achnanthes trachyderma comb. nov. Stauroneis apiculata and S.(?) obesa are recombined as Achnanthes apiculata comb. nov. and Achnanthes obesa comb. nov. respectively. The examination with light and scanning electron microscope of several marine samples from the Society Archipelago details the unique morphology of Achnanthes trachyderma which, until recently, has been often misidentified as Achnanthes citronella due to certain similarities between both taxa.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
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  • 3
    Publikationsdatum: 2019-07-17
    Beschreibung: This study focused on the short-term variations of sea ice microalgal biomass and nutrients, in Adélie Land coastal area (Antarctica). The annual land-fast ice, platelet ice-like layer (PLI) and under-lying seawater were sampled during the 1999 austral spring. The study was conducted during 33 days preceding the ice break-up, with a daily sampling when the meteorological conditions were favourable. Time-series for salinity, chlorophyll a (Chl a), NH4+, NO2−, NO3−, PO4− and Si(OH)4 are shown. We also provide satellite data and meteorological variables for the same period. During the study period, the solid ice thickness varied from 1.47 to 1.05 m. Pigments were concentrated in bottom ice, but progressively invaded the PLI. Phaeo a increased in the PLI during the last weeks, in parallel with increasing NO2− concentration. Si(OH)4, in lowest concentrations in bottom ice, increased progressively in the under-ice water (UIW) and PLI, this was because of offshore water inputs. NH4+ concentrations were high in every sea ice component (particularly in the bottom ice) and were inversely correlated to pigments in the bottom ice. NH4+ concentrations progressively increased in the PLI and underlying seawater just before the break-up. In the bottom ice, PO4− concentrations were related to high pigment concentrations, but with a short lag close to the break up period, indicating in situ regeneration. Neither NO3− nor NH4+ concentrations were exhausted in the bottom ice. NO2− and NH4+ concentrations increased in PLI and under-ice water just before the break-up period, which might indicate strong inorganic nitrogen recycling in land-fast ice. Approximately 0.4 kmol km−1 linear coast of NH4+ (1 kmol NO3− and 2 kmol PO4−) were released to the under-ice seawater during break-up, along with 0.12 tons km−1 Chl a (9.6 tons POC km−1 equivalent). These nutrient sea ice inputs to the coastal zone waters, during the ice recession and break-up, may vary annually depending upon the local meteorological conditions that control ice formation, duration of ice cover and melting.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , peerRev
    Format: application/pdf
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  • 5
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    Unbekannt
    In:  EPIC3International Glaciological Society - Symposium on Sea Ice in the Physical and Biogeochemical System, 31 May - 4 June 2010, Tromsø, Norway.
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Conference , notRev
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  • 6
    Publikationsdatum: 2019-07-17
    Beschreibung: Data pertaining to environmental conditions, sympagic (sea ice) microalgal dynamics and particle flux were collected before the spring ice break-up 2001 in Pierre Lejay Bay, adjacent to the Dumont d'Urville Station, Petrel Island, East Antarctica. An array of two multiple sediment traps and a current meter was deployed for five weeks, from 8 November to 6 December 2001. The sea-ice chlorophyll a and particulate organic carbon (POC) averaged 0.6 mg l−1 (30 mg m−2) and 20 mg l−1 (1 g m−2) near the coast. The POC export flux that reached a maximum of 79 mg m−2 d−1 during the study period was high compared to the one for the Weddell Sea. The flux was homogeneous from the surface to 47 m depth and increased sharply 33 days before the effective ice break-up. A north-western progressive vector of currents (i.e., Lagrangian drift) in the sub-ice surface waters was demonstrated. Bottom ice, platelet ice and under-ice water at 5 m were characterized by differences in colonization and short-term succession of microalgae.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2022-05-27
    Beschreibung: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Rogers, A. D., Baco, A., Escobar-Briones, E., Gjerde, K., Gobin, J., Jaspars, M., Levin, L., Linse, K., Rabone, M., Ramirez-Llodra, E., Sellanes, J., Shank, T. M., Sink, K., Snelgrove, P. V. R., Taylor, M. L., Wagner, D., & Harden-Davies, H. Marine genetic resources in areas beyond national jurisdiction: promoting marine scientific research and enabling equitable benefit sharing. Frontiers in Marine Science, 8, (2021): 667274, https://doi.org/10.3389/fmars.2021.667274.
    Beschreibung: Growing human activity in areas beyond national jurisdiction (ABNJ) is driving increasing impacts on the biodiversity of this vast area of the ocean. As a result, the United Nations General Assembly committed to convening a series of intergovernmental conferences (IGCs) to develop an international legally-binding instrument (ILBI) for the conservation and sustainable use of marine biological diversity of ABNJ [the biodiversity beyond national jurisdiction (BBNJ) agreement] under the United Nations Convention on the Law of the Sea. The BBNJ agreement includes consideration of marine genetic resources (MGR) in ABNJ, including how to share benefits and promote marine scientific research whilst building capacity of developing states in science and technology. Three IGCs have been completed to date with the fourth delayed by the Covid pandemic. This delay has allowed a series of informal dialogues to take place between state parties, which have highlighted a number of areas related to MGR and benefit sharing that require technical guidance from ocean experts. These include: guiding principles on the access and use of MGR from ABNJ; the sharing of knowledge arising from research on MGR in ABNJ; and capacity building and technology transfer for developing states. In this paper, we explain what MGR are, the methods required to collect, study and archive them, including data arising from scientific investigation. We also explore the practical requirements of access by developing countries to scientific cruises, including the sharing of data, as well as participation in research and development on shore whilst promoting rather than hindering marine scientific research. We outline existing infrastructure and shared resources that facilitate access, research, development, and benefit sharing of MGR from ABNJ; and discuss existing gaps. We examine international capacity development and technology transfer schemes that might facilitate or complement non-monetary benefit sharing activities. We end the paper by highlighting what the ILBI can achieve in terms of access, utilization, and benefit sharing of MGR and how we might future-proof the BBNJ Agreement with respect to developments in science and technology.
    Beschreibung: We would like to thank the Governments of The Kingdom of Belgium, The Principality of Monaco and Costa Rica, as well as The Prince Albert II Monaco Foundation, The Norwegian Nobel Institute, The Nobel Institute, The High Seas Alliance, The Pew Charitable Trusts, Ocean Unite and REV Ocean for supporting the High Seas Treaty Dialogues which have allowed informal discussions between States representatives on the Biodiversity Beyond National Jurisdiction agreement.
    Schlagwort(e): high seas ; marine genetic resources ; access and benefit sharing ; UNCLOS ; developing states
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
    Standort Signatur Erwartet Verfügbarkeit
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