/sup 234/Th: /sup 238/U disequilibria within the California Current

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Limnol. Oceanogr.; (United States)

DOI:https://doi.org/10.4319/lo.1985.30.1.0022· OSTI ID:5610248

Coale, K H; Bruland, K W

Profiles of dissolved and particulate /sup 234/Th were determined at several stations within the California Current. Modeling of the disequilibria between the /sup 234/Th and /sup 238/U within the surface waters provides for estimates of the residence time of dissolved thorium with respect to particle scavenging, the particle residence time, and the particulate /sup 234/Th flux exiting the surface layer. The model-derived, first-order scavenging rate constant for dissolved thorium is observed to be proportional to the rate of primary production. Particle residence times seem to be governed by the rate of zooplankton grazing and the types of zooplankton present. Model-derived particulate /sup 234/Th fluxes are in good agreement with direct measurements by sediment traps.

• Research Organization: Univ. of California, Santa Cruz
• OSTI ID: 5610248
• Journal Information: Limnol. Oceanogr.; (United States), Journal Name: Limnol. Oceanogr.; (United States) Vol. 30:1; ISSN LIOCA
• Country of Publication: United States
• Language: English

Related Subjects

520300* -- Environment
Aquatic-- Radioactive Materials Monitoring & Transport-- (1989)
54 ENVIRONMENTAL SCIENCES
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
AQUATIC ORGANISMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALIFORNIA
CHEMISTRY
CURRENTS
DAYS LIVING RADIOISOTOPES
EVEN-EVEN NUCLEI
FEDERAL REGION IX
HEAVY NUCLEI
HYDROGEN COMPOUNDS
ISOTOPE RATIO
ISOTOPES
MATHEMATICAL MODELS
NORTH AMERICA
NUCLEI
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PLANKTON
RADIOISOTOPES
SCAVENGING
SEAWATER
SURFACE WATERS
THORIUM 234
THORIUM ISOTOPES
TIME DEPENDENCE
URANIUM 238
URANIUM ISOTOPES
USA
WATER
WATER CHEMISTRY
WATER CURRENTS
YEARS LIVING RADIOISOTOPES
ZOOPLANKTON