Rare earth element transport in the western North Atlantic inferred from Nd isotopic observations
Journal Article
·
· Geochim. Cosmochim. Acta; (United States)
The isotopic composition of Nd in the water column from several western North Atlantic sites and formational areas for North Atlantic Deep Water shows extensive vertical structure at all locations. In regions where a thermocline is well-developed, large isotopic shifts (2 to 3 epsilon units) are observed across the base of the thermocline. Regions without a thermocline are characterized by much more gradual shifts in isotopic composition with depth. In general, the data reveal an excellent correlation between the Nd isotopic distribution in the western North Atlantic water column and the distribution of water masses identified from temperature and salinity characteristics. NADW, as identified from T-S properties, is also characterized by a well-defined isotopic composition having epsilonsub(Nd)(0) = -13.5 +- 0.5. This signature is associated with waters identified as NADW from high latitudes near formational areas in the Labrador Sea down to the equatorial region. The isotopic signature of NADW would appear to be formed by a blend of more negative waters originating in the Labrador Sea and more positive waters originating in the overflows from the Norwegian and Greenland Seas and is consistent with classical theories on the formation of NADW.
- Research Organization:
- California Inst. of Tech., Pasadena, USA. Div. of Geological and Planetary Sciences
- OSTI ID:
- 6417510
- Journal Information:
- Geochim. Cosmochim. Acta; (United States), Journal Name: Geochim. Cosmochim. Acta; (United States) Vol. 51:5; ISSN GCACA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
520300* -- Environment
Aquatic-- Radioactive Materials Monitoring & Transport-- (1989)
54 ENVIRONMENTAL SCIENCES
ALPHA DECAY RADIOISOTOPES
ATLANTIC OCEAN
DATA
DEPTH
DIMENSIONS
DISTRIBUTION
ELEMENTS
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPE RATIO
ISOTOPES
MASS TRANSFER
METALS
NEODYMIUM 143
NEODYMIUM 144
NEODYMIUM ISOTOPES
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
RADIONUCLIDE MIGRATION
RARE EARTH NUCLEI
RARE EARTHS
SALINITY
SEAS
SPATIAL DISTRIBUTION
STABLE ISOTOPES
SURFACE WATERS
YEARS LIVING RADIOISOTOPES
400102 -- Chemical & Spectral Procedures
520300* -- Environment
Aquatic-- Radioactive Materials Monitoring & Transport-- (1989)
54 ENVIRONMENTAL SCIENCES
ALPHA DECAY RADIOISOTOPES
ATLANTIC OCEAN
DATA
DEPTH
DIMENSIONS
DISTRIBUTION
ELEMENTS
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPE RATIO
ISOTOPES
MASS TRANSFER
METALS
NEODYMIUM 143
NEODYMIUM 144
NEODYMIUM ISOTOPES
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
RADIONUCLIDE MIGRATION
RARE EARTH NUCLEI
RARE EARTHS
SALINITY
SEAS
SPATIAL DISTRIBUTION
STABLE ISOTOPES
SURFACE WATERS
YEARS LIVING RADIOISOTOPES