| Titre : | High Po-210 Activity Concentration in the Surface Water of Malaysian Seas Driven by the Dry Season of the Southwest Monsoon (June-August 2009) |
| Auteurs : | Asnor Azrin Sabuti, Auteur ; Che Abd Rahim Mohamed, Auteur |
| Type de document : | Article |
| Dans : | Estuaries and Coasts (38(2) MAR 2015) |
| Article en page(s) : | 482-493 |
| Résumé : | Surface seawater was collected using a high-volume water pump in Malaysian waters during the first Prime Scientific Sailing Expedition in 2009 to obtain activity levels of lead-210 (Pb-210) and polonium-210 (Po-210). The Pb-210 activity in surface water obtained from this sampling ranged from 0.22 +/- 0.06 to 0.96 +/- 0.31 mBq/L, averaging 0.58 +/- 0.28 mBq/L, whereas the Po-210 activity was between 1.52 +/- 0.11 and 8.98 +/- 0.96 mBq/L, averaging 4.19 +/- 0.58 mBq/L. The Po-210/Pb-210 activity ratios in the surface water at the studied sites were between 3.48 +/- 1.06 and 13.08 +/- 3.78, with an average of 7.27 +/- 3.73, which is distinctly higher than the range of 0.1 to 2.8 in the whole southern South China Sea and western Pacific regions. The relatively high activities of dissolved Po-210 in Malaysian waters can be attributed to high depositional fluxes of the radionuclides from enhanced dry precipitations caused by haze events. The higher Po-210 fractions found in this study compared with those found in the major oceans were due to terrestrial fires with estimated Po-210 residence times between 0.15 and 0.51 years, slightly less than the 0.2- to 0.8-year residence times found in oceans with higher productivities. Higher residence times have also been observed more often offshore than near the shoreline. This phenomenon results in a slower rate of removal of Po-210 from offshore surface water. |
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