Spatial variations of particle scavenging rates within the central and northern Adriatic Sea: use of U--Th disequilibria

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Dissolved and particlulate Thorium-234 ({sup 234}Th) were measured in near surface waters from the Central and Northern Adriatic Sea in order to gain an insight into the intensity and variability of active scavenging and particle removal processes. Dissolved {sup 234}Th to Uranium-238 ({sup 238}U) activity ratios vary from 0.21 to 0.75 and clearly imply that {sup 234}Th is being actively scavenged from sea water on a timescale of <3 months. The scavenging rate of dissolved {sup 234}Th with respect to scavenging onto particles appears to correlate with primary productivity measurements. Scavenging and rapid removal of particulate {sup 234}Th from the ... continued below

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21 p.; Other: FDE: PDF; PL:

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Hamilton, T. F. April 1, 1998.

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Dissolved and particlulate Thorium-234 ({sup 234}Th) were measured in near surface waters from the Central and Northern Adriatic Sea in order to gain an insight into the intensity and variability of active scavenging and particle removal processes. Dissolved {sup 234}Th to Uranium-238 ({sup 238}U) activity ratios vary from 0.21 to 0.75 and clearly imply that {sup 234}Th is being actively scavenged from sea water on a timescale of <3 months. The scavenging rate of dissolved {sup 234}Th with respect to scavenging onto particles appears to correlate with primary productivity measurements. Scavenging and rapid removal of particulate {sup 234}Th from the water column is best explained by a mechanism of zooplankton grazing and fecal pellet production. At one sight in the Jabuka Pit, particulate {sup 234}Th residence times below the pycnocline are long (30-40 days) suggesting that particles are being more readily recycled at these depths. By comparison, in a seawater profile collected near the Po outflow region, {sup 234}Th is depleted with respect to {sup 238}U through the entire water column. We conclude from this assessment that particles in waters near the Po River outflow will be more efficiently transported to bottom sediments compared with those in deeper waters over the Jabuka Pit.

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21 p.; Other: FDE: PDF; PL:

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OSTI as DE98057885

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  • EEC conference on physical and biogeochemical processes of the Adriatic Sea, Ancona (Italy), 23-27 Apr 1996

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  • Other: DE98057885
  • Report No.: UCRL-JC--123865-Rev.1
  • Report No.: CONF-9604130--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 664596
  • Archival Resource Key: ark:/67531/metadc702260

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  • April 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • June 10, 2016, 9:22 p.m.

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Hamilton, T. F. Spatial variations of particle scavenging rates within the central and northern Adriatic Sea: use of U--Th disequilibria, article, April 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc702260/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.