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Datasets of project "European Iron Enrichment Experiment in the Southern Ocean"

Mostrando recursos 1 - 20 de 755

  1. Measurements of organic complexation of iron during the CARUSO-EISENEX experiment

    Boyé, Marie; Nishioka, Jun; Croot, Peter L; Laan, Patrick; Timmermans, Klaas R; de Baar, Hein J W
    The speciation of strongly chelated iron during the 22-day course of an iron enrichment experiment in the Atlantic sector of the Southern Ocean deviates strongly from ambient natural waters. Three iron additions (ferrous sulfate solution) were conducted, resulting in elevated dissolved iron concentrations (Nishioka, J., Takeda, S., de Baar, H.J.W., Croot, P.L., Boye, M., Laan, P., Timmermans, K.R., 2005, Changes in the concentration of iron in different size fractions during an iron enrichment experiment in the open Southern Ocean. Marine Chemistry, doi:10.1016/j.marchem.2004.06.040) and significant Fe(II) levels (Croot, P.L., Laan, P., Nishioka, J., Strass, V., Cisewski, B., Boye, M., Timmermans, K.R.,...

  2. Profiles of iron concentration from GoFlow bottles during the CARUSO-EISENEX experiment

    Nishioka, Jun; Takeda, Shigenobu; de Baar, Hein J W; Croot, Peter L; Boyé, Marie; Laan, Patrick; Timmermans, Klaas R
    An in situ iron enrichment experiment was carried out in the Southern Ocean Polar Frontal Zone and fertilized a patch of water within an eddy of the Antarctic Circumpolar Current (EisenEx, Nov. 2000). During the experiment, a physical speciation technique was used for iron analysis in order to understand the changes in iron distribution and size-fractionations, including soluble Fe (<200 kDa), colloidal Fe (200 kDa-0.2 µm) and labile particle Fe (>0.2 µm), throughout the development of the phytoplankton bloom. Prior to the first infusion of iron, dissolved (<0.2 µm) iron concentrations in the ambient surface seawater were extremely low (0.06±0.015 nM)...

  3. Sulphur hexafluoride (SF6) measured on water bottle samples during POLARSTERN cruise ANT-XVIII/2 (EisenEx)

    Messias, Marie-José

  4. Ingestion and clearance rates of Copepods

    Schultes, Sabine; Verity, Peter; Bathmann, Ulrich
    Feeding activity, selective grazing and the potential grazing impact of two dominant grazers of the Polar Frontal Zone, Calanus simillimus and Rhincalanus gigas, and of copepods < 2 mm were investigated with incubation experiments in the course of an iron fertilized diatom bloom in November 2000. All grazers were already actively feeding in the low chlorophyll waters prior to the onset of the bloom. C. simillimus maintained constant clearance rates and fed predominantly on diatoms. R. gigas and the small copepods strongly increased clearance and ingestion of diatoms in response to their enhanced availability. All grazers preyed on microzooplankton, most...

  5. Biogenic halocarbons and light alkyl nitrates in the South Atlantic

    Chuck, Adele L
    The ocean plays a significant role in the trace gas composition of the atmosphere, via sea-to-air emissions, which are controlled by biotic and abiotic production and consumption processes occurring within the water column. Both the halocarbons and alkyl nitrates affect the 'oxidising capacity' of the atmosphere, primarily as a result of their influence on ozone concentration. Halocarbons have been shown to be produced biogenically by various species of microalgae in laboratory studies. However, the production processes and their fluxes in the open ocean are poorly characterised. In general, the alkyl nitrates have a predominantly anthropogenic source, but atmospheric measurements in...

  6. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples during POLARSTERN cruise ANT-XVIII/2 (EisenEx)

    Chuck, Adele L
    The ocean plays a significant role in the trace gas composition of the atmosphere, via sea-to-air emissions, which are controlled by biotic and abiotic production and consumption processes occurring within the water column. Both the halocarbons and alkyl nitrates affect the 'oxidising capacity' of the atmosphere, primarily as a result of their influence on ozone concentration. Halocarbons have been shown to be produced biogenically by various species of microalgae in laboratory studies. However, the production processes and their fluxes in the open ocean are poorly characterised. In general, the alkyl nitrates have a predominantly anthropogenic source, but atmospheric measurements in...

  7. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/108-1

    Chuck, Adele L

  8. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/107-5

    Chuck, Adele L

  9. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/092-3

    Chuck, Adele L

  10. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/091-4

    Chuck, Adele L

  11. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/090-4

    Chuck, Adele L

  12. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/088-4

    Chuck, Adele L

  13. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/061-1

    Chuck, Adele L

  14. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/049-3

    Chuck, Adele L

  15. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/048-3

    Chuck, Adele L

  16. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/046-3

    Chuck, Adele L

  17. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/045-2

    Chuck, Adele L

  18. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/042-2

    Chuck, Adele L

  19. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/041-2

    Chuck, Adele L

  20. Biogenic halocarbons and light alkyl nitrates measured on water bottle samples at station PS58/038-3

    Chuck, Adele L

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