Matches in SemOpenAlex for { <https://semopenalex.org/work/W2281011671> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W2281011671 abstract "226Ra (half-life 1600 years) has been used as a tracer for ocean circulation and is rated a bio-intermediate element due to its participation in the biogeochemical cycle. Based on the similarity of vertical water column profiles of 226Ra and Si, it has been hypothezised that siliceous tests act as a main carrier phase for 226Ra (e.g. Ku et al. 1970). However, direct evidence for incorporation of 226Ra by silicate-forming plankton is very scanty. Measurements on different plankton species as well as controlled tank experiments yield ambiguous results.Here we present a high-resolution N-S-transect for 226Ra and Si in surface waters of the Antarctic Circumpolar Current (ACC) and the Weddell Gyre (WG) at 20° E. Both elements show a general increase from north to south with the highest values in the region where upwelling Circumpolar Deep Water enters the WG. 226Ra approximately doubles from 8 dpm/100kg to 17 dpm/100kg. Si concentrations reach maximum values of 70 µmol/l south of the Polar Front (PF). The relationship between both parameters is rather weak. The high resolution sampling shows that local variations in the Si concentrations are not mirrored by changes in the 226Ra activity. Particulate uptake of 226Ra continues north of the PF after the near depletion of Si, indicating a decoupling between diatom productivity and the 226Ra distribution in the Southern Ocean.We propose that acantharians, SrSO4-forming radiolarians, might act as a major carrier phase for radium in the upper ocean. They have recently been attributed an important role in the biogeochemistry of Ba (Bernstein et al. 1998). Based on the above observations and the geochemical similarities of Ra and Ba, it seems likely that the biogeochemistry of radium in the upper ocean is equally affected by acantharians as Ba is. For the open ACC, acantharian abundances can reach 30 000 individuals per m3. The continuing depletion of 226Ra after the exhaustion of Si north of the PF could indeed be linked to the increasing importance acantharians gain in the marine productivity cycle in subantarcic and subtropical waters.Bernstein, R.E., Byrne, R.H. and Schijf, J. (1998): Acantharians: a missing link in the oceanic biogeochemistry of barium. Deep-Sea Research I, 45, 491-505.Ku, T.-L., Li, Y.H., Mathieu, G.G. and Wong, H.K. (1970): Radium in the Indian-Antarctic Ocean south of Australia. Journal of Geophysical Research, 75, 5286-5292." @default.
- W2281011671 created "2016-06-24" @default.
- W2281011671 creator A5021285552 @default.
- W2281011671 creator A5062291073 @default.
- W2281011671 date "2001-01-01" @default.
- W2281011671 modified "2023-09-23" @default.
- W2281011671 title "Decoupling of 226Ra and Si in surface waters of the Atlantic Sector of the Southern Ocean" @default.
- W2281011671 hasPublicationYear "2001" @default.
- W2281011671 type Work @default.
- W2281011671 sameAs 2281011671 @default.
- W2281011671 citedByCount "0" @default.
- W2281011671 crossrefType "journal-article" @default.
- W2281011671 hasAuthorship W2281011671A5021285552 @default.
- W2281011671 hasAuthorship W2281011671A5062291073 @default.
- W2281011671 hasConcept C107872376 @default.
- W2281011671 hasConcept C108469399 @default.
- W2281011671 hasConcept C111368507 @default.
- W2281011671 hasConcept C122846477 @default.
- W2281011671 hasConcept C127313418 @default.
- W2281011671 hasConcept C14168384 @default.
- W2281011671 hasConcept C149348798 @default.
- W2281011671 hasConcept C157485413 @default.
- W2281011671 hasConcept C185592680 @default.
- W2281011671 hasConcept C187599188 @default.
- W2281011671 hasConcept C197248824 @default.
- W2281011671 hasConcept C2778964748 @default.
- W2281011671 hasConcept C30380174 @default.
- W2281011671 hasConcept C39432304 @default.
- W2281011671 hasConcept C505870484 @default.
- W2281011671 hasConcept C6582778 @default.
- W2281011671 hasConcept C71915725 @default.
- W2281011671 hasConcept C78091846 @default.
- W2281011671 hasConcept C83042747 @default.
- W2281011671 hasConcept C83133772 @default.
- W2281011671 hasConcept C8625798 @default.
- W2281011671 hasConcept C86803240 @default.
- W2281011671 hasConcept C87717796 @default.
- W2281011671 hasConceptScore W2281011671C107872376 @default.
- W2281011671 hasConceptScore W2281011671C108469399 @default.
- W2281011671 hasConceptScore W2281011671C111368507 @default.
- W2281011671 hasConceptScore W2281011671C122846477 @default.
- W2281011671 hasConceptScore W2281011671C127313418 @default.
- W2281011671 hasConceptScore W2281011671C14168384 @default.
- W2281011671 hasConceptScore W2281011671C149348798 @default.
- W2281011671 hasConceptScore W2281011671C157485413 @default.
- W2281011671 hasConceptScore W2281011671C185592680 @default.
- W2281011671 hasConceptScore W2281011671C187599188 @default.
- W2281011671 hasConceptScore W2281011671C197248824 @default.
- W2281011671 hasConceptScore W2281011671C2778964748 @default.
- W2281011671 hasConceptScore W2281011671C30380174 @default.
- W2281011671 hasConceptScore W2281011671C39432304 @default.
- W2281011671 hasConceptScore W2281011671C505870484 @default.
- W2281011671 hasConceptScore W2281011671C6582778 @default.
- W2281011671 hasConceptScore W2281011671C71915725 @default.
- W2281011671 hasConceptScore W2281011671C78091846 @default.
- W2281011671 hasConceptScore W2281011671C83042747 @default.
- W2281011671 hasConceptScore W2281011671C83133772 @default.
- W2281011671 hasConceptScore W2281011671C8625798 @default.
- W2281011671 hasConceptScore W2281011671C86803240 @default.
- W2281011671 hasConceptScore W2281011671C87717796 @default.
- W2281011671 hasLocation W22810116711 @default.
- W2281011671 hasOpenAccess W2281011671 @default.
- W2281011671 hasPrimaryLocation W22810116711 @default.
- W2281011671 hasRelatedWork W1188298243 @default.
- W2281011671 hasRelatedWork W181646898 @default.
- W2281011671 hasRelatedWork W1968725610 @default.
- W2281011671 hasRelatedWork W1971918159 @default.
- W2281011671 hasRelatedWork W1976418545 @default.
- W2281011671 hasRelatedWork W2000360180 @default.
- W2281011671 hasRelatedWork W2016198969 @default.
- W2281011671 hasRelatedWork W2039383031 @default.
- W2281011671 hasRelatedWork W2042041966 @default.
- W2281011671 hasRelatedWork W2043141314 @default.
- W2281011671 hasRelatedWork W2045895508 @default.
- W2281011671 hasRelatedWork W2052582380 @default.
- W2281011671 hasRelatedWork W2055586175 @default.
- W2281011671 hasRelatedWork W2076336408 @default.
- W2281011671 hasRelatedWork W2086789058 @default.
- W2281011671 hasRelatedWork W2276573029 @default.
- W2281011671 hasRelatedWork W2617378904 @default.
- W2281011671 hasRelatedWork W2806860666 @default.
- W2281011671 hasRelatedWork W2912794933 @default.
- W2281011671 hasRelatedWork W2931888855 @default.
- W2281011671 isParatext "false" @default.
- W2281011671 isRetracted "false" @default.
- W2281011671 magId "2281011671" @default.
- W2281011671 workType "article" @default.