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- W2606323900 abstract "Abstract The 210 Po‐ 210 Pb pair is increasingly used as a proxy of quantifying organic carbon export from the euphotic zone. However, disequilibria between 210 Po and 210 Pb in mesopelagic water have been poorly studied. Here we present unusual deficiencies of 210 Po with respect to 210 Pb in mesopelagic water (200–1000 m) in the South China Sea (SCS). The total particulate matter (TPM) increased by up to 32% in the mesopelagic layer comparing with the euphotic zone. The total 210 Po/ 210 Pb ratio varied from 0.41 to 0.98 with an average of 0.72 ± 0.19, showing an enhanced removal of 210 Po in mesopelagic water. On average, particulate 210 Po and 210 Pb increased by 23% and 32% at the slope stations, respectively. These results indicated that the 210 Po deficits result from lateral transport, probably via benthic nepheloid layer. Based on the deficiency of 210 Po, the residence times of particulate 210 Po were estimated to range from 0.11 to 0.25 year (avg. 0.17 ± 0.07 year), allowing resuspended sediment to disperse over a long range. The export fluxes of 210 Po varied from 68 to 121 dpm m −2 d −1 with an average of 96 ± 27 dpm m −2 d −1 , which was 6 times that out of the euphotic zone. Using the 210 Po deficits, the export fluxes of TPM out of the mesopelagic layer were quantified to vary from 4.19 to 10.20 g m −2 d −1 , revealing a large amount of particles from the shelf to the SCS basin. This study suggests that 210 Po‐ 210 Pb could be an effective tracer of tracking particle cycling in mesopelagic water." @default.
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- W2606323900 date "2017-04-01" @default.
- W2606323900 modified "2023-10-14" @default.
- W2606323900 title "Utilizing <sup>210</sup><scp>P</scp>o deficit to constrain particle dynamics in mesopelagic water, western <scp>S</scp>outh <scp>C</scp>hina <scp>S</scp>ea" @default.
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- W2606323900 doi "https://doi.org/10.1002/2017gc006899" @default.
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