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Datasets of project "Global marine biogeochemical cycles of trace elements and their isotopes"

Mostrando recursos 1 - 20 de 370

  1. Oxygen and hydrogen isotopes measured in the Northeast Atlantic

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A
    Only a few studies have examined the variation of oxygen and hydrogen isotopes of seawater in NE Atlantic water masses, and data are especially sparse for intermediate and deep-water masses. The current study greatly expands this record with 527 d18O values from 47 stations located throughout the mid- to low-latitude NE Atlantic. In addition, dD was analyzed in the 192 samples collected along the GEOTRACES North Atlantic Transect GA03 (GA03_e=KN199-4) and the 115 Iberia-Forams cruise samples from the western and southern Iberian margin. An intercomparison study between the two stable isotope measurement techniques (cavity ring-down laser spectroscopy and magnetic-sector isotope...

  2. Oxygen isotopes measured on water bottle samples during POSEIDON cruise POS383

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A

  3. Oxygen isotopes measured on water bottle samples during POSEIDON cruise POS377

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A

  4. Oxygen isotopes measured on water bottle samples during POSEIDON cruise POS349

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A

  5. Oxygen and hydrogen isotopes measured on water bottle samples during KNORR cruise KNR199-4

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A

  6. Oxygen isotopes measured on water bottle samples during James Clark Ross cruise JR218

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A

  7. Oxygen and hydrogen isotopes measured on water bottle samples during EUROFLEETS cruise Iberia-Forams

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A

  8. Physical oceanography during EUROFLEETS Iberia-Forams

    Voelker, Antje H L; Colman, Albert Smith; Olack, Gerard; Waniek, Joanna J; Hodell, David A

  9. Dissolved Iron, Aluminium, and Dissolved Inorganic Phosphorus in the (Sub-)Tropical Atlantic Surface Ocean

    Schlosser, Christian; Klar, Jessica K; Wake, Bronwyn D; Snow, Joseph T; Honey, David J; Woodward, E Malcolm S; Lohan, Maeve C; Achterberg, Eric P; Moore, C Mark
    Inorganic nitrogen depletion restricts productivity in much of the low-latitude oceans, generating a selective advantage for diazotrophic organisms capable of fixing atmospheric dinitrogen (N2). However, the abundance and activity of diazotrophs can in turn be controlled by the availability of other potentially limiting nutrients, including phosphorus (P) and iron (Fe). Here we present high-resolution data (~0.3°) for dissolved iron, aluminum, and inorganic phosphorus that confirm the existence of a sharp north-south biogeochemical boundary in the surface nutrient concentrations of the (sub)tropical Atlantic Ocean. Combining satellite-based precipitation data with results from a previous study, we here demonstrate that wet deposition in...

  10. Dissolved Zinc in the Southern Ocean measured on water bottle samples during POLARSTERN cruise ANT-XXIV/3

    Croot, Peter L; Baars, Oliver; Streu, Peter
    The distribution of dissolved zinc (Zn) was investigated in the Atlantic sector of the Southern Ocean in the austral autumn of 2008 as part of the IPY GEOTRACES expedition ZERO & DRAKE. Research focused on transects across the major frontal systems along the Zero Meridian and across the Drake Passage. There was a strong gradient in surface zinc concentrations observed across the Antarctic Polar Front along both transects and high zinc levels were found in surface waters throughout the Southern Ocean. Vertical profiles for dissolved Zinc showed the presence of local minima and maxima in the upper 200 m consistent...

  11. (Appendix A) Dissolved manganese concentrations during POLARSTERN Cruise ARK-XXII/2

    Middag, Rob; de Baar, Hein J W; Laan, Patrick; Klunder, Maarten B
    A total of 773 samples were analysed for dissolved manganese (Mn) in the Arctic Ocean aboard R.V. Polarstern during expedition ARK XXII/2 from 28 July until 07 October 2007 from Tromsø (Norway) to Bremerhaven. Concentrations of Mn were elevated in the surface layer with concentrations of up to 6 nM over the deep Basins and over 20 nM in the Laptev Sea. The general distribution of Mn through the water column is consistent with previous studies, but there are differences in the absolute concentrations that are most likely related to differences in sample area, sampling and filtration. The elevated concentrations of...

  12. (Figure 3) Dissolved aluminium concentrations during POLARSTERN Cruise ANT-XXIV/3

    Middag, Rob; van Slooten, C; de Baar, Hein J W; Laan, Patrick
    Dissolved aluminium (Al) occurs in a wide range of concentrations in the world oceans. The concentrations of Al in the Southern Ocean are among the lowest ever observed. An all-titanium CTD sampling system makes it possible to study complete deep ocean sections of Al and other trace elements with the same high vertical resolution of 24 depths as normal for traditional CTD/Rosette sampling. Overall, 470 new data points of Al are reported for 22 full depth stations and 24 surface sampling positions along one transect. This transect consisted of 18 stations on the zero meridian proper from 51°57'S until 69°24'S,...

  13. (Figure 2) Dissolved manganese concentrations during POLARSTERN Cruise ANT-XXIV/3

    Middag, Rob; de Baar, Hein J W; Laan, Patrick; Cai, PH; van Ooijen, Jan C
    The first comprehensive dataset (492 samples) of dissolved Mn in the Southern Ocean shows extremely low values of 0.04 up to 0.64 nM in the surface waters and a subsurface maximum with an average concentration of 0.31 nM (n=20; S.D.=0.08 nM). The low Mn in surface waters correlates well with the nutrients PO4 and NO3 and moderately well with Si(OH)4 and fluorescence. Furthermore, elevated concentrations of Mn in the surface layer coincide with elevated Fe and light transmission and decreased export (234Th/238U deficiency) and fluorescence. It appears that Mn is a factor of importance in partly explaining the HNLC conditions...

  14. (Table 1) Water column biogenic silica concentrations and Si isotopic composition during Marion Dufresne cruise MD166 off South Africa

    Fripiat, François; Cavagna, Anne-Julie; Dehairs, Frank; de Brauwere, A; André, Luc; Cardinal, Damien
    Southern Ocean biogeochemical processes have an impact on global marine primary production and global elemental cycling, e.g. by likely controlling glacial-interglacial pCO2 variation. In this context, the natural silicon isotopic composition (d30Si) of sedimentary biogenic silica has been used to reconstruct past Si-consumption:supply ratios in the surface waters. We present a new dataset in the Southern Ocean from a IPY-GEOTRACES transect (Bonus-GoodHope) which includes for the first time summer d30Si signatures of suspended biogenic silica (i) for the whole water column at three stations and (ii) in the mixed layer at seven stations from the subtropical zone up to the...

  15. (Table 1) Water column silicic acid concentrations and Si isotopic composition during Marion Dufresne cruise MD166 off South Africa

    Fripiat, François; Cavagna, Anne-Julie; Dehairs, Frank; Speich, Sabrina; André, Luc; Cardinal, Damien
    Silicon isotopic signatures (d30Si) of water column silicic acid (Si(OH)4) were measured in the Southern Ocean, along a meridional transect from South Africa (Subtropical Zone) down to 57° S (northern Weddell Gyre). This provides the first reported data of a summer transect across the whole Antarctic Circumpolar Current (ACC). d30Si variations are large in the upper 1000 m, reflecting the effect of the silica pump superimposed upon meridional water transfer across the ACC: the transport of Antarctic surface waters northward by a net Ekman drift and their convergence and mixing with warmer upper-ocean Si-depleted waters to the north. Using Si...

  16. Beryllium 7 measured during POLARSTERN cruise ARK-XXII/2

    Cámara-Mor, Patricia; Masqué, Pere; García-Orellana, J; Kern, Stefan; Cochran, J Kirk; Hanfland, Claudia
    The natural cosmogenic radionuclide 7Be (T1/2 = 53.4 d) is supplied to the surface ocean from the atmosphere and, in the Arctic Ocean, can be used as a tracer of the efficiency with which sea ice intercepts the atmospheric fluxes of chemical species and of the importance of ice as a transport mechanism for particulate matter and chemical species. Analyses of 7Be in samples of surface water, surface sea ice, water beneath the ice, sea ice sediments, and precipitation from the Eurasian Basin of the Arctic Ocean show that the fraction of sea ice coverage determines the amount of 7Be...

  17. Beryllium 7 in sea ice sediments during POLARSTERN cruise ARK-XXII/2

    Cámara-Mor, Patricia; Masqué, Pere; García-Orellana, J; Kern, Stefan; Cochran, J Kirk; Hanfland, Claudia

  18. Precipitation of Beryllium 7 during POLARSTERN cruise ARK-XXII/2

    Cámara-Mor, Patricia; Masqué, Pere; García-Orellana, J; Kern, Stefan; Cochran, J Kirk; Hanfland, Claudia

  19. Beryllium 7 measured in surface water samples during POLARSTERN cruise ARK-XXII/2

    Cámara-Mor, Patricia; Masqué, Pere; García-Orellana, J; Kern, Stefan; Cochran, J Kirk; Hanfland, Claudia

  20. Beryllium 7 measured on surface sea ice during POLARSTERN cruise ARK-XXII/2

    Cámara-Mor, Patricia; Masqué, Pere; García-Orellana, J; Kern, Stefan; Cochran, J Kirk; Hanfland, Claudia

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