On the importance of the decay of 234Th in determining size-fractionated C/234Th ratio on marine particles

Details On the importance of the decay of 234Th in determining size-fractionated C/234Th ratio on marine particles On the importance of the decay of 234Th in determining size-fractionated C/234Th ratio on marine particles

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3323602c&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 23, CiteID L23602

Mathematics

Logic

2

Geochemistry: Marine Geochemistry (4835, 4845, 4850), Biogeosciences: Carbon Cycling (4806), Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Chemical Tracers, Oceanography: Biological And Chemical: Radioactivity And Radioisotopes

Scientific paper

Accurate determination of the POC/234Th ratio on sinking particles is essential for the application of 234Th as a proxy for the export of particulate organic carbon (POC) from the upper ocean. Previous studies have shown that POC/234Th ratios may vary by as much as two orders of magnitude, but the mechanism for this variability remains poorly understood. In this study, POC/234Th and POC/228Th ratios in three particle size classes were examined for samples collected from the upper 500 m at a station in the South China Sea. Our results indicate that changes in the POC/234Th ratio with particle size at a given depth are mostly driven by simple decay of 234Th. In fact, various trends in the POC/234Th ratio versus particle size are explained by a combination of 234Th decay and the preferential remineralization of POC relative to Th during particle aggregation. We also observed a trend of decreasing 234Th/228Th ratios with particle size. This trend is consistent with results expected from a Brownian-pumping model.

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