中国海
海洋学
焊剂(冶金)
停留时间(流体动力学)
清除
远洋带
大陆架
地表水
箱形模型
水团
环境科学
粒子(生态学)
污染物
海水
地质学
大气科学
化学
有机化学
岩土工程
环境工程
抗氧化剂
生物化学
作者
Yoshiyuki Nozaki,Hiroyuki Tsubota,Vimonrut Kasemsupaya,Mayumi Yashima,Naoko Ikuta
标识
DOI:10.1016/0016-7037(91)90305-o
摘要
228Ra, 226Ra, 210Pb, and 210Po were measured in the surface waters of the East China and Yellow seas. Using mass balance equations for the Ra isotopes, we estimated the total flux of diffusion from sediments and desorption from suspended particles to be 0.1 dpm 226Ra cm−2 a−1 and 1 dpm 228Ra cm−2 a−1, and residence times to be 2–3 years for the waters on the East China Sea Shelf and 5–6 years for Yellow Sea waters. Box-model calculations yielded generally congruent scavenging residence times for 210Pb and 210Po in the waters of ~2 months on the shelf and ~7 months in the Kuroshio Current. These suggest that reactive heavy metals and pollutants discharged through rivers from the continent to the East Asian continental shelf are largely deposited on the bottom sediments prior to transport to the pelagic ocean by lateral mixing.
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