Anthropogenic radionuclides in the Atlantic GEOTRACES sections A11 and A02

Kenna, T. C., Masque, P., Camara-Mor, P., Puigcorbe, P., Garcia-Orellana, J., Frank, Martin, Rijkenberg, M., Gerringa, L., de Baar, H. and Henry, C. L. (2012) Anthropogenic radionuclides in the Atlantic GEOTRACES sections A11 and A02 [Poster] In: 2012 Ocean Sciences Meeting, OSM, 20.02.-24.02.2012, Salt Lake City, Utah, USA.

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Abstract ID: 11526
PosterID: A0020
We are focused on determining the total concentrations of the anthropogenic radionuclides 239Pu, 240Pu, 237Np, and 137Cs in depth profiles from 2010 Atlantic GEOTRACES sections. Data from the equatorial region (A11) compared to GEOSECS data indicate water column inventories of 137Cs have increased over the last 40 years, while those of Pu are variable. By comparison, Pu and 237Np water column inventories are similar to regional soil core inventories, whereas 137Cs inventories are significantly higher, further suggesting continued supply of 137Cs to the open ocean. Water column 240Pu/239Pu inventory ratios are indicative of global fallout (~0.18). Deviations of the water column 237Np/239Pu inventory ratio from the average global fallout value (~0.48) can be used to estimate Pu-particulate fluxes, which are comparable to sediment trap data and may be used to assess scavenging at different locations along the cruise track. Data from mid and high latitude regions (A02) will be compare them to GEOSECS data; inventories and ratios will be used to identify additional contaminant sources, as water mass tracers, and to elucidate important processes such as scavenging and remineralization.

Document Type: Conference or Workshop Item (Poster)
Keywords: Oceanography; Biogeochemistry; Radionuclides; Atlantic Ocean
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
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Date Deposited: 12 Apr 2012 12:24
Last Modified: 12 Apr 2012 12:37

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