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2 Research products, page 1 of 1

  • European Marine Science
  • Other research products
  • Netherlands Organisation for Scientific Research (NWO)
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  • ES
  • Biogeosciences (BG)
  • Aurora Universities Network

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  • Open Access English
    Authors: 
    Bar, Marijke W.; Ullgren, Jenny E.; Thunnell, Robert C.; Wakeham, Stuart G.; Brummer, Geert-Jan A.; Stuut, Jan-Berend W.; Sinninghe Damsté, Jaap S.; Schouten, Stefan;
    Project: EC | DUSTTRAFFIC (311152), NWO | TRAFFIC: Transatlantic fl... (9378), NWO | Perturbations of System E... (11030), EC | DIOLS (339206)

    In this study we analyzed sediment trap time series from five tropical sites to assess seasonal variations in concentrations and fluxes of long-chain diols (LCDs) and associated proxies with emphasis on the long-chain diol index (LDI) temperature proxy. For the tropical Atlantic, we observe that generally less than 2 % of LCDs settling from the water column are preserved in the sediment. The Atlantic and Mozambique Channel traps reveal minimal seasonal variations in the LDI, similar to the two other lipid-based temperature proxies TEX86 and U37K′. In addition, annual mean LDI-derived temperatures are in good agreement with the annual mean satellite-derived sea surface temperatures (SSTs). In contrast, the LDI in the Cariaco Basin shows larger seasonal variation, as do the TEX86 and U37K′. Here, the LDI underestimates SST during the warmest months, which is possibly due to summer stratification and the habitat depth of the diol producers deepening to around 20–30 m. Surface sediment LDI temperatures in the Atlantic and Mozambique Channel compare well with the average LDI-derived temperatures from the overlying sediment traps, as well as with decadal annual mean SST. Lastly, we observed large seasonal variations in the diol index, as an indicator of upwelling conditions, at three sites: in the eastern Atlantic, potentially linked to Guinea Dome upwelling; in the Cariaco Basin, likely caused by seasonal upwelling; and in the Mozambique Channel, where diol index variations may be driven by upwelling from favorable winds and/or eddy migration.

  • Open Access English
    Authors: 
    Langer, G.; Nehrke, G.; Probert, I.; Ly, J.; Ziveri, P.;
    Project: NWO | Quaternary marine ecosyst... (2300130622), EC | ASSEMBLE (227799)

    Four strains of the coccolithophore E. huxleyi (RCC1212, RCC1216, RCC1238, RCC1256) were grown in dilute batch culture at four CO2 levels ranging from ~200 μatm to ~1200 μatm. Growth rate, particulate organic carbon content, and particulate inorganic carbon content were measured, and organic and inorganic carbon production calculated. The four strains did not show a uniform response to carbonate chemistry changes in any of the analysed parameters and none of the four strains displayed a response pattern previously described for this species. We conclude that the sensitivity of different strains of E. huxleyi to acidification differs substantially and that this likely has a genetic basis. We propose that this can explain apparently contradictory results reported in the literature.

Advanced search in Research products
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The following results are related to European Marine Science. Are you interested to view more results? Visit OpenAIRE - Explore.
2 Research products, page 1 of 1
  • Open Access English
    Authors: 
    Bar, Marijke W.; Ullgren, Jenny E.; Thunnell, Robert C.; Wakeham, Stuart G.; Brummer, Geert-Jan A.; Stuut, Jan-Berend W.; Sinninghe Damsté, Jaap S.; Schouten, Stefan;
    Project: EC | DUSTTRAFFIC (311152), NWO | TRAFFIC: Transatlantic fl... (9378), NWO | Perturbations of System E... (11030), EC | DIOLS (339206)

    In this study we analyzed sediment trap time series from five tropical sites to assess seasonal variations in concentrations and fluxes of long-chain diols (LCDs) and associated proxies with emphasis on the long-chain diol index (LDI) temperature proxy. For the tropical Atlantic, we observe that generally less than 2 % of LCDs settling from the water column are preserved in the sediment. The Atlantic and Mozambique Channel traps reveal minimal seasonal variations in the LDI, similar to the two other lipid-based temperature proxies TEX86 and U37K′. In addition, annual mean LDI-derived temperatures are in good agreement with the annual mean satellite-derived sea surface temperatures (SSTs). In contrast, the LDI in the Cariaco Basin shows larger seasonal variation, as do the TEX86 and U37K′. Here, the LDI underestimates SST during the warmest months, which is possibly due to summer stratification and the habitat depth of the diol producers deepening to around 20–30 m. Surface sediment LDI temperatures in the Atlantic and Mozambique Channel compare well with the average LDI-derived temperatures from the overlying sediment traps, as well as with decadal annual mean SST. Lastly, we observed large seasonal variations in the diol index, as an indicator of upwelling conditions, at three sites: in the eastern Atlantic, potentially linked to Guinea Dome upwelling; in the Cariaco Basin, likely caused by seasonal upwelling; and in the Mozambique Channel, where diol index variations may be driven by upwelling from favorable winds and/or eddy migration.

  • Open Access English
    Authors: 
    Langer, G.; Nehrke, G.; Probert, I.; Ly, J.; Ziveri, P.;
    Project: NWO | Quaternary marine ecosyst... (2300130622), EC | ASSEMBLE (227799)

    Four strains of the coccolithophore E. huxleyi (RCC1212, RCC1216, RCC1238, RCC1256) were grown in dilute batch culture at four CO2 levels ranging from ~200 μatm to ~1200 μatm. Growth rate, particulate organic carbon content, and particulate inorganic carbon content were measured, and organic and inorganic carbon production calculated. The four strains did not show a uniform response to carbonate chemistry changes in any of the analysed parameters and none of the four strains displayed a response pattern previously described for this species. We conclude that the sensitivity of different strains of E. huxleyi to acidification differs substantially and that this likely has a genetic basis. We propose that this can explain apparently contradictory results reported in the literature.