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  • 2020-2024  (6)
  • 2020-2022  (3)
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  • 1
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    Effects of Atlantification and changing sea‐ice dynamics on zooplankton community structure and carbon flux between 2000 and 2016 in the eastern Fram Strait (2022)
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2023-12-14
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The collection of zooplankton swimmers and sinkers in time‐series sediment traps provides unique insight into year‐round and interannual trends in zooplankton population dynamics. These samples are particularly valuable in remote and difficult to access areas such as the Arctic Ocean, where samples from the ice‐covered season are rare. In the present study, we investigated zooplankton composition based on swimmers and sinkers collected by sediment traps at water depths of 180–280, 800–1320, and 2320–2550 m, over a period of 16 yr (2000–2016) at the Long‐Term Ecological Research observatory HAUSGARTEN located in the eastern Fram Strait (79°N, 4°E). The time‐series data showed seasonal and interannual trends within the dominant zooplankton groups including copepoda, foraminifera, ostracoda, amphipoda, pteropoda, and chaetognatha. Amphipoda and copepoda dominated the abundance of swimmers while pteropoda and foraminifera were the most important sinkers. Although the seasonal occurrence of these groups was relatively consistent between years, there were notable interannual variations in abundance, suggesting the influence of various environmental conditions such as sea‐ice dynamic and lateral advection of water masses, for example, meltwater and Atlantic water. Statistical analyses revealed a correlation between the Arctic dipole climatic index and sea‐ice dynamics (i.e., ice coverage and concentration), as well as the importance of the distance from the ice edge on swimmer composition patterns and carbon export.〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: Federal Ministry of Education and Research (BMBF)
    Description: Helmholtz‐Gemeinschaft
    Keywords: ddc:577.7 ; eastern Fram Strait ; sea ice dynamics ; zooplankton population dynamics
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Effects of Atlantification and changing sea‐ice dynamics on zooplankton community structure and carbon flux between 2000 and 2016 in the eastern Fram Strait (2023)
    Wiley
    Details
    Publication Date: 2024-02-07
    Description: The collection of zooplankton swimmers and sinkers in time-series sediment traps provides unique insight into year-round and interannual trends in zooplankton population dynamics. These samples are particularly valuable in remote and difficult to access areas such as the Arctic Ocean, where samples from the ice-covered season are rare. In the present study, we investigated zooplankton composition based on swimmers and sinkers collected by sediment traps at water depths of 180–280, 800–1320, and 2320–2550 m, over a period of 16 yr (2000–2016) at the Long-Term Ecological Research observatory HAUSGARTEN located in the eastern Fram Strait (79°N, 4°E). The time-series data showed seasonal and interannual trends within the dominant zooplankton groups including copepoda, foraminifera, ostracoda, amphipoda, pteropoda, and chaetognatha. Amphipoda and copepoda dominated the abundance of swimmers while pteropoda and foraminifera were the most important sinkers. Although the seasonal occurrence of these groups was relatively consistent between years, there were notable interannual variations in abundance, suggesting the influence of various environmental conditions such as sea-ice dynamic and lateral advection of water masses, for example, meltwater and Atlantic water. Statistical analyses revealed a correlation between the Arctic dipole climatic index and sea-ice dynamics (i.e., ice coverage and concentration), as well as the importance of the distance from the ice edge on swimmer composition patterns and carbon export.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Carbon, silicon, carbonate, seston, and biogenic and lithogenic export fluxes from sediment traps deployed in the Eurasian Arctic Ocean (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: AWI_BioOce; Biogenic, flux; Biological Oceanography @ AWI; Calcium carbonate, flux; Carbon, organic, particulate, flux; DATE/TIME; DEPTH, water; Duration, number of days; Elevation of event; Event label; FRAM; FRontiers in Arctic marine Monitoring; Gakkel_A1-1; Gakkel_N1-1; Latitude of event; Lithogenic, flux; Longitude of event; MOOR; Mooring; PS78/255-1; PS78/262-3; Seston, flux; Silicon, dissolved + particulate, flux
    Type: Dataset
    Format: text/tab-separated-values, 518 data points
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    DATA PANGAEA
  • 4
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    Biomarker fluxes from sediment traps deployed in the Eurasian Arctic Ocean (2020)
    PANGAEA
    Details
    Publication Date: 2023-11-30
    Keywords: 2,6,10,14-Tetramethyl-7-(3-methylpent-4-enyl)pentadecane, flux; 24-Methylcholest-5-en-3beta-ol and 24-Ethylcholest-5-en-3beta-ol, flux; 24-Methylcholesta-5,22E-dien-3beta-ol, flux; AWI_BioOce; Biological Oceanography @ AWI; DATE/TIME; DEPTH, water; Duration; Duration, number of days; Elevation of event; Event label; FRAM; FRontiers in Arctic marine Monitoring; Gakkel_A1-1; Gakkel_N1-1; Latitude of event; Longitude of event; MOOR; Mooring; PS78/255-1; PS78/262-3
    Type: Dataset
    Format: text/tab-separated-values, 295 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Effects of Atlantification and changing sea-ice dynamics on zooplankton community structure and carbon flux between 2000 and 2016 in the eastern Fram Strait (2022)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Description: The collection of zooplankton swimmers and sinkers in time-series sediment traps provides a unique insight into year-round and inter-annual trends in zooplankton population dynamics. Such samples are particularly valuable in remote and difficult to access areas such as the Arctic Ocean, where samples from the ice-covered seasons are rare. In the present study, we investigated zooplankton composition based on swimmers and sinkers collected by sediment traps at water depths of 180-280 m, 800-1320 m, and 2320-2550 m, over a period of 16 years (2000-2016) at the central station of the LTER (Long-Term Ecological Research) HAUSGARTEN observatory in the Fram Strait. The time-series data include the abundance of copepoda, foraminifera, ostracoda, amphipoda, pteropoda, and chaetognatha that were collected in the sediment trap time-series.
    Keywords: Amphipoda, flux; ARK-XVI/2; ARK-XVII/1; ARK-XVIII/1; ARK-XX/1; ARK-XXI/1b; ARK-XXII/1c; ARK-XXIII/2; ARK-XXIV/2; ARK-XXIX/2.2; ARK-XXV/2; ARK-XXVI/2; ARK-XXVII/2; ARK-XXVIII/2; Chaetognatha, flux; Copepoda, flux; DATE/TIME; DEPTH, water; Event label; FEVI1; FEVI10; FEVI13; FEVI16; FEVI18; FEVI2; FEVI20; FEVI22; FEVI24; FEVI26; FEVI28; FEVI3; FEVI30; FEVI32; FEVI7; Foraminifera, flux; FRAM; FRontiers in Arctic marine Monitoring; Hausgarten; HAUSGARTEN 2013; Latitude of event; Longitude of event; Long-term Investigation at AWI-Hausgarten off Svalbard; Maria S. Merian; Mooring (long time); MOORY; MSM02/4; MSM2/787-1, HGIV; MSM29; North Greenland Sea; Ostracoda, flux; Polarstern; Position; PS57; PS57/273-1, HGIV; PS59; PS59/101-1, HGIV; PS62; PS62/179-2, HGIV; PS66; PS66/129-1, HGIV; PS68; PS68/263-1, HGIV; PS70; PS70/218-1, HGIV; PS72; PS72/155-1, HGIV; PS74; PS74/125-2, HGIV; PS76; PS76/147-1, HGIV; PS78; PS78/177-1, HGIV; PS80; PS85; PS85/462-1, HGIV; PS93.2; Pteropoda, flux; sediment trap; Sediment trap; sinkers; swimmers; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 3488 data points
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    DATA PANGAEA
  • 6
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    Annual cycle of downward particle fluxes on each side of the Gakkel Ridge in the central Arctic Ocean (2020)
    ROYAL SOC
    In:  EPIC3Philosophical Transactions of the Royal Society A, ROYAL SOC, 378(2181)
    Details
    Publication Date: 2020-09-07
    Description: Two mooring arrays carrying sediment traps were deployed from September 2011 to August 2012 at ∼83°N on each side of the Gakkel Ridge in the Nansen and Amundsen Basins to measure downward particle flux below the euphotic zone (approx. 250m) and approximately 150 m above seafloor at approximately 3500 and 4000m depth, respectively. In a region that still experiences nearly complete ice cover throughout the year, export fluxes of total particulate matter (TPM), particulate organic carbon (POC), particulate nitrogen (PN), biogenic matter, lithogenic matter, biogenic particulate silica (bPSi), calcium carbonate (CaCO3 ), protists and biomarkers only slightly decreased with depth. Seasonal variations of particulate matter fluxes were similar on both sides of the Gakkel Ridge. Somewhat higher export rates in the Amundsen Basin and differences in the composition of the sinking TPM and bPSi on each side of the Gakkel Ridge probably reflected the influence of the Lena River/Transpolar Drift in the Amundsen Basin and the influence of Atlantic water in the Nansen Basin. Low variations in particle export with depth revealed a limited influence of lateral advection in the deep barren 2 Eurasian Basin. This article is part of the theme issue ‘The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning’.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 7
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    Summertime Chlorophyll a and Particulate Organic Carbon Standing Stocks in Surface Waters of the Fram Strait and the Arctic Ocean (1991–2015) (2020)
    In:  EPIC3Frontiers in Marine Science, 7(350)
    Details
    Publication Date: 2020-06-28
    Description: Sea ice in the Arctic Ocean (AO) has been undergoing dramatic changes during the last two decades. In addition, the water temperature of the inflow of Atlantic water masses at the gateway Fram Strait has recently increased. Long-term data may help to evaluate the impact of these physical changes on the biological processes in surface waters. Over a 25-year period, and mostly in summer, water samples were collected at discrete depths within the uppermost 100 m of the Fram Strait and other regions of the AO to investigate chlorophyll a (Chl a) and particulate organic carbon (POC) standing stocks. Stations sampled from 1991 to 2015 were located in the Fram Strait, Barents Sea (BS), on the Eurasian shelf, and over the Nansen, Amundsen, and parts of the Amerasian basins (AB). Discrete Chl a and POC measurements obtained during 33 and 24 expeditions, respectively, were integrated over the upper 100 m of the water column to monitor spatial and interannual variations in distribution patterns of standing stocks. In general, the highest Chl a and POC standing stocks were observed in the eastern Fram Strait (EFS) and in the BS, while the lowest biomasses were observed in the heavily ice-covered regions of the central AO, mainly in the Amundsen and ABs. Whereas summertime Chl a stocks sharply decreased northward from the Fram Strait and Barents Sea toward high latitudes, the decline in POC standing stocks was less pronounced. Over the sampling period, summertime Chl a stocks slightly increased in the EFS but remained more or less constant in the central AO. In contrast to Chl a, standing stocks of POC eventually increased over the last 25 years in the central AO, possibly as an effect of increasing air temperatures, decreasing sea ice extent and thickness, and increasing light availability. Moreover, variations in riverine discharge and in sea ice export within the Transpolar Drift may have contributed to the enhanced POC stock in the central AO surface waters. Overall, the objective of the present study was to provide baseline datasets of Chl a and POC to better track the effects of environmental changes due to global warming on the Arctic pelagic system.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Seasonal and Interannual Variability in Sedimentation Patterns of Carbonate Shell Bearing Organisms in the Fram Strait and the Central Arctic Ocean (2020)
    In:  EPIC3Ocean Sciences Meeting, San Diego, USA, 2020-02-16-2020-02-21
    Details
    Publication Date: 2021-09-21
    Description: In the Arctic Ocean sea ice volume and extent currently experience massive reduction due to global warming. These rapid changes may have unforeseen consequences for pelagic biodiversity and biogeochemistry, particularly CO2 sequestration by the biological carbon pump. The production and export of carbonate-bearing organisms from the surface ocean can influence effective CO2 sequestration. However, the impact of rising temperatures and changing ice conditions on the export of carbonate-bearing organisms remains poorly constrained. Here we use sediment trap records to describe biogenic carbonate flux in relation to total matter flux and the export of foraminiferans, pteropods and ostracods. Samples were obtained from two sites: the Long-Term Ecological Research (LTER) observatory HAUSGARTEN in seasonally ice-covered eastern Fram Strait (since 2000), and over one annual cycle in the almost entirely ice-covered Nansen and Amundsen Basins (2011-2012). The flux of carbonate shell-bearing organisms showed large variations seasonally and annually at both Fram Strait and in the Central Arctic Ocean (CAO). Whereas the flux of foraminiferans was comparable at both sites, pteropod flux was high in the Fram Strait and negligible in Nansen and Amundsen Basin pointing towards a higher share of aragonite flux on total carbonate flux in the Fram Strait than in the CAO. Total matter and carbonate export flux were about one order of magnitude lower in the CAO compared to the eastern Fram Strait. Together, these results suggests that the two regions are characterized by different ecosystems and export mechanisms. The Fram Strait is changing from a partially seasonal ice-covered region towards an ice-free region with strong pelagic production and might provide valuable insights to the future of a summertime ice-free CAO.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    Effects of Atlantification and changing sea-ice dynamics on zooplankton community structure and carbon flux between 2000 and 2016 in the eastern Fram Strait (2022)
    AMER SOC LIMNOLOGY OCEANOGRAPHY
    In:  EPIC3Limnology and Oceanography, AMER SOC LIMNOLOGY OCEANOGRAPHY, 9999, pp. 1-15, ISSN: 0024-3590
    Details
    Publication Date: 2023-06-21
    Description: The collection of zooplankton swimmers and sinkers in time-series sediment traps provides unique insight into year-round and interannual trends in zooplankton population dynamics. These samples are particularly valuable in remote and difficult to access areas such as the Arctic Ocean, where samples from the ice-covered season are rare. In the present study, we investigated zooplankton composition based on swimmers and sinkers collected by sediment traps at water depths of 180–280, 800–1320, and 2320–2550 m, over a period of 16 yr (2000–2016) at the Long-Term Ecological Research observatory HAUSGARTEN located in the eastern Fram Strait (79°N, 4°E). The time-series data showed seasonal and interannual trends within the dominant zooplankton groups including copepoda, foraminifera, ostracoda, amphipoda, pteropoda, and chaetognatha. Amphipoda and copepoda dominated the abundance of swimmers while pteropoda and foraminifera were the most important sinkers. Although the seasonal occurrence of these groups was relatively consistent between years, there were notable interannual variations in abundance, suggesting the influence of various environmental condi- tions such as sea-ice dynamic and lateral advection of water masses, for example, meltwater and Atlantic water. Statistical analyses revealed a correlation between the Arctic dipole climatic index and sea-ice dynamics (i.e., ice coverage and concentration), as well as the importance of the distance from the ice edge on swimmer composition patterns and carbon export.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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    PAPER (OA)
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