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  • 1
    Electronic Resource
    Electronic Resource
    Do diatoms in the Swiss Alps reflect the length of ice-cover? (2000)
    Springer
    Aquatic sciences 62 (2000), S. 125-141 
    Details
    ISSN: 1420-9055
    Keywords: Key words: Diatoms, sediment traps, ice-cover, surface sediments, climate change.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract: Diatom analyses in the water column, sediment traps, surficial sediments as well as in a short sediment core from Hagelseewli (2339 m asl, Swiss Alps) give information about the present-day seasonal cycle of diatom blooms, taphonomic processes in the lake basin and the lake's history. Analyses of surficial sediments show that water depth and thus light and nutrient availability is the most important factor influencing the production and distribution of diatom assemblages in Hagelseewli, and that periphytic diatom valves deposited in the deeper part of the basin originate from the shallow, littoral parts and are transported to the central part by processes such as lateral currents or sediment focussing. The lake is characterised by a very short period (2-3 months) of open water. Water-column and sediment-trap data revealed that planktonic diatoms bloom during and after the ice break-up, whereas mainly periphytic Fragilaria species entered the traps during the ice-covered period. These results suggest that plankton development is strongly inhibited by the ice-cover, with longer periods of ice-cover favouring Fragilaria species in Hagelseewli. The diatom analysis of a short sediment core that includes the last five centuries revealed several changes in the proportion of planktonic diatoms to Fragilaria species. The colder phases of the Little Ice-Age correspond to phases of lower concentration of planktonic diatoms. The highest, statistically significant amount of variance in the downcore diatom data is explained by winter precipitation, which directly influences the length of the ice-cover but inversely influences the light regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000270050002
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    Paper (German National Licenses)
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  • 2
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    Chemical concentrations and fluxes from EPICA ice cores EDML and EDC (2007)
    PANGAEA
    In:  Supplement to: Fischer, Hubertus; Fundel, Felix; Ruth, Urs; Twarloh, Birthe; Wegner, Anna; Udisti, Roberto; Becagli, Silvia; Castellano, Emiliano; Morganti, Andrea; Severi, Mirko; Wolff, Eric William; Littot, Geneviève C; Röthlisberger, Regine; Mulvaney, Robert; Hutterli, Manuel A; Kaufmann, Patrik R; Federer, Urs; Lambert, Fabrice; Bigler, Matthias; Hansson, Margareta E; Jonsell, Ulf; de Angelis, Martine; Boutron, Claude F; Siggaard-Andersen, Marie-Louise; Steffensen, Jørgen Peder; Barbante, Carlo; Gaspari, Vania; Gabrielli, Paolo; Wagenbach, Dietmar (2007): Reconstruction of millennial changes in dust emission, transport and regional sea ice coverage using the deep EPICA ice cores from the Atlantic and Indian Ocean sector of Antarctica. Earth and Planetary Science Letters, 260(1-2), 340-354, https://doi.org/10.1016/j.epsl.2007.06.014
    Details
    Publication Date: 2023-10-19
    Description: Continuous sea salt and mineral dust aerosol records have been studied on the two EPICA (European Project for Ice Coring in Antarctica) deep ice cores. The joint use of these records from opposite sides of the East Antarctic plateau allows for an estimate of changes in dust transport and emission intensity as well as for the identification of regional differences in the sea salt aerosol source. The mineral dust flux records at both sites show a strong coherency over the last 150 kyr related to dust emission changes in the glacial Patagonian dust source with three times higher dust fluxes in the Atlantic compared to the Indian Ocean sector of the Southern Ocean (SO). Using a simple conceptual transport model this indicates that transport can explain only 40% of the atmospheric dust concentration changes in Antarctica, while factor 5-10 changes occurred. Accordingly, the main cause for the strong glacial dust flux changes in Antarctica must lie in environmental changes in Patagonia. Dust emissions, hence environmental conditions in Patagonia, were very similar during the last two glacials and interglacials, respectively, despite 2-4 °C warmer temperatures recorded in Antarctica during the penultimate interglacial than today. 2-3 times higher sea salt fluxes found in both ice cores in the glacial compared to the Holocene are difficult to reconcile with a largely unchanged transport intensity and the distant open ocean source. The substantial glacial enhancements in sea salt aerosol fluxes can be readily explained assuming sea ice formation as the main sea salt aerosol source with a significantly larger expansion of (summer) sea ice in the Weddell Sea than in the Indian Ocean sector. During the penultimate interglacial, our sea salt records point to a 50% reduction of winter sea ice coverage compared to the Holocene both in the Indian and Atlantic Ocean sector of the SO. However, from 20 to 80 ka before present sea salt fluxes show only very subdued millennial changes despite pronounced temperature fluctuations, likely due to the large distance of the sea ice salt source to our drill sites.
    Keywords: EPICA; European Project for Ice Coring in Antarctica
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 3
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    EPICA EDML chemical concentrations and fluxes (2007)
    PANGAEA
    Details
    Publication Date: 2023-10-19
    Keywords: Age model; Age model, ice flow model; Calcium, non-sea-salt; Calcium, non-sea-salt, flux; Calculated; DEPTH, ice/snow; EDML; EDRILL; EPICA; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land, DML28C01_00; European Project for Ice Coring in Antarctica; Ion chromatography; Kohnen Station; Sodium, sea-salt; Sodium, sea-salt, flux
    Type: Dataset
    Format: text/tab-separated-values, 11295 data points
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    DATA PANGAEA
  • 4
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    EPICA Dome C chemical concentrations and fluxes (2007)
    PANGAEA
    Details
    Publication Date: 2023-10-19
    Keywords: Age model; Age model, ice flow model; Calcium, non-sea-salt; Calcium, non-sea-salt, flux; Calculated; Continuous flow analysis, Ion chromatography; DEPTH, ice/snow; Dome C; Dome C, Antarctica; EDC; EPICA; EPICA Dome C; European Project for Ice Coring in Antarctica; ICEDRILL; Ice drill; Ion chromatography; Sodium, sea-salt; Sodium, sea-salt, flux
    Type: Dataset
    Format: text/tab-separated-values, 8558 data points
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    DATA PANGAEA
  • 5
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    Lake Sedimentary DNA Research on Past Terrestrial and Aquatic Biodiversity: Overview and Recommendations (2021)
    In:  EPIC3Quaternary, 4(1), pp. 6, ISSN: 2571-550X
    Details
    Publication Date: 2021-10-12
    Description: The use of lake sedimentary DNA to track the long-term changes in both terrestrial and aquatic biota is a rapidly advancing field in paleoecological research. Although largely applied nowadays, knowledge gaps remain in this field and there is therefore still research to be conducted to ensure the reliability of the sedimentary DNA signal. Building on the most recent literature and seven original case studies, we synthesize the state-of-the-art analytical procedures for effective sampling, extraction, amplification, quantification and/or generation of DNA inventories from sedimentary ancient DNA (sedaDNA) via high-throughput sequencing technologies. We provide recommendations based on current knowledge and best practises
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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    PAPER (OA)
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