海洋における微量元素の滞留時間と除去のメカニズム

• 野崎 義行

  エール大学地質学地球物理学科

書誌事項

タイトル別名

• Residence times and the removal mechanisms of trace elements in the ocean
• カイヨウ ニ オケル ビリョウ ゲンソ ノ タイリュウ ジカン ト ジョキョ

抄録

The overall residence time of elements in the ocean water is controlled by a number of processes. In general, transport processes from source to sink as well as phase transformation within the ocean appear to control their oceanic residence times. Their relative importance depends on the residence time of the element in relation to oceanic mixing time. The dependence of residence times on the source and sink functions are derived using a diffusion-advection-phase transformation model. This model can be used to predict the oceanic response to the various types of source functions of materials; for example, supply of pollutants caused by industrialization. A particular application of the model is made for the distribution of ²¹⁰Pb. The ²¹⁰Pb residence time calculated in the surface and subsurface ocean depends on the thickness of the layer, i. e. the size of reservior. This can be best understood in terms of downward transport of the atmospherically derived ²¹⁰Pb by settling of particles bearing ²¹⁰Pb. In the deep ocean however, the dependence of ²¹⁰Pb resideece time on the size of reservior becomes obscure due to in-situ production from ²²⁶Ra, possible regeneration of particulate ²¹⁰Pb originated from the above waters and in-situ scavenging by settling particulate matter. Available data are insufficient to deduce the actual removal mechanisms, and hence to test the validity of several models presented by previous workers for the removal of ²¹⁰Pb and the related trace metals in the deep sea. Information on age characteristics of reactive radionuclides present in the ocean and leaving out of the ocean should help to clarify them.

収録刊行物

• 地球化学

  地球化学 12 (1), 27-36, 1978

  一般社団法人日本地球化学会

詳細情報

• CRID: 1390282680718537088
• NII論文ID: 110008679645
• NII論文ID: 10010834551
• NII書誌ID: AN00141280
• DOI: 10.14934/chikyukagaku.12.27
• ISSN: 21885923
• ISSN: 03864073
• NDL書誌ID: 1922175
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I1922175
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可