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Hung G.W., Wang P., Shen Y.T.

Particulate scavenging and lateral transport processes in the Kaoping River-Sea System based on 210 Po and 210 Pb distributions and disequilibrium. Hung G.W., Wang P., Shen Y.T. Station locations in the KPSC region. Potential temperature vs. salinity diagram, showing

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Hung G.W., Wang P., Shen Y.T.

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  1. Particulate scavenging and lateral transport processes in the Kaoping River-Sea System based on 210Po and 210Pb distributions and disequilibrium Hung G.W., Wang P., Shen Y.T.

  2. Station locations in the KPSC region

  3. Potential temperature vs. salinity diagram, showing characteristics of the typical West Philippine Sea (WPS) and South China Sea (SCS) waters and those of stations in the KPSC region.

  4. Depth profiles of temperature, salinity and fluorescence for all stations in the study area.

  5. 0.36-19.17 mg/kg for CW1-CW3 0.01-2.13 mg/kg for CW4 and CW5 Profiles of the suspended particulate matter (SPM).

  6. Profiles of the SPM, fluorescence, and 210Pb and 210Po in both the particulate and dissolved phases.

  7. Particulate 210Pb and 210Po concentrations vs. SPM for (a) and (b). Particulate 210Po activities vs. fluorescence in the surface water. The linear regression was estimated excluding the data from CW1 and CW3 for (c). (a) (b) Plot of log specific activities of 210Pb and 210Po vs. log SPM for (d). (d) (c)

  8. Plots of 210Po vs. 210Pb in the dissolved phase and in the total activities from all stations.

  9. Profiles of total 210Pb, 210Po and 226Ra concentrations in the KPSC region. The 226Ra profile was estimated from data determined by Dr. Chung’s laboratory.

  10. 210Pb and 210Po inventories and residence times in the surface waters in the KPSC region.

  11. Comparison of 210Pb flux due to particle sinking and calculated from the 210Pb inventory in the sedimentary column.

  12. SPM profiles generally show an increase with depth to a maximum in the bottom layer and display an offshore decrease trend. Summary The dissolved 210Po and 210Pb values in the outlet region of the KPSC are generally higher than those observed in the KPSC. The particulate 210Po and 210Pb concentrations in the outlet region of the KPSC are generally lower than those in the KPSC, especially in the bottom layer. Positive correlations between both 210Pb and 210Po in particulate phase and SPM concentrations as well as negative log specific activities of 210Pb and 210Po versus log SPM correlations are observed in the study area.

  13. 210Pb is removed from the surface water with residence • times of 0.6-1.3 and 0.8-3.9 years for dissolved and • particulate 210Pb. The residence times of 210Po in the • surface waters are 0.4-2.6 and 0.1-0.4 years for dissolved • and particulate 210Po. Summary • Comparing 210Pb fluxes, calculated from the 210Pb inventory • in the sedimentary column and in the water column, suggest • settling 210Pb flux from the overlying water column is about • 51-103% of the excess 210Pb flux in the bottom sediments.

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