<noframes id="dzdnh">

<form id="dzdnh"></form><noframes id="dzdnh"><address id="dzdnh"><nobr id="dzdnh"></nobr></address>
<form id="dzdnh"><nobr id="dzdnh"></nobr></form>
    <noframes id="dzdnh">
    設為首頁 | 加入收藏
    林武輝,何建華,余克服,杜金秋,鄧芳芳,梁林,李俊怡,何賢文,陳寶才,馮亮亮.海洋中90Sr:日本周邊海域與南海的對比[J].海洋學報,2020,42(10):47-58
    海洋中90Sr:日本周邊海域與南海的對比
    90Sr in marine environment: Comparison of seas surrounding Japan and the South China Sea
    投稿時間:2020-04-02  修訂日期:2020-07-19
    DOI:10.3969/j.issn.0253-4193.2020.10.005
    中文關鍵詞:  福島核事故  放射性  海水  生物  沉積物  造礁珊瑚
    英文關鍵詞:Fukushima Nuclear Accident  radioactivity  seawater  biotas  sediment  reef coral
    基金項目:國家自然科學基金項目(41906043);廣西自然科學基金(2017GXNSFBA198096,2019GXNSFAA185006)。
    作者單位E-mail
    林武輝 廣西大學 海洋學院,廣西 南寧 530004
    廣西南海珊瑚礁研究重點實驗室,廣西 南寧 530004 
     
    何建華 自然資源部第三海洋研究所,福建 廈門 361005  
    余克服 廣西大學 海洋學院,廣西 南寧 530004
    廣西南海珊瑚礁研究重點實驗室,廣西 南寧 530004 
    kefuyu@scsio.ac.cn 
    杜金秋 國家海洋環境監測中心,遼寧 大連 116023  
    鄧芳芳 自然資源部第三海洋研究所,福建 廈門 361005  
    梁林 廣西大學 海洋學院,廣西 南寧 530004  
    李俊怡 廣西大學 海洋學院,廣西 南寧 530004  
    何賢文 廣西壯族自治區輻射環境監督管理站,廣西 南寧 530222  
    陳寶才 廣西壯族自治區輻射環境監督管理站,廣西 南寧 530222  
    馮亮亮 廣西壯族自治區輻射環境監督管理站,廣西 南寧 530222  
    摘要點擊次數: 1408
    全文下載次數: 4382
    中文摘要:
          90Sr長期被視為最重要的人工放射性核素之一,日本福島核事故導致包括90Sr在內的大量放射性物質泄漏進入海洋,廠區儲水罐中冷卻廢水至今仍然存在大量90Sr。海洋中90Sr分析方法卻繁瑣耗時,導致核事故后的90Sr研究較為匱乏,且缺乏系統的認識。本研究在2015-2018年期間測量南海海水和多種海洋生物(馬尾藻、海蝦、牡蠣、紅樹林植物、造礁珊瑚)中90Sr的基礎上,深入分析核事故后日本周邊海域和南海90Sr的比活度水平與環境半衰期。結合文獻資料,本研究發現1975-2010年期間日本近岸海水90Sr的環境半衰期為15.4 a,2011年的核事故后日本周邊海洋中90Sr比活度顯著升高,基于ERICA軟件定量計算核事故后90Sr對海洋魚類的劑量率比核事故前的結果高5個數量級。南海作為福島核事故后北太平洋環流的下游海域,本文進一步構建1984-2018年期間南海90Sr比活度的歷史曲線,發現核事故前后南海90Sr比活度水平沒有可識別的變化,進一步定量計算南海90Sr的環境半衰期為26.7 a,發現邊緣海和大洋中90Sr和137Cs環境半衰期格局差異與核素(90Sr和137Cs)的源匯過程(河流輸入和海洋生物泵)密切相關。鑒于海洋中90Sr分析方法的挑戰性,本文發現在10多種海洋生物中造礁珊瑚骨骼幾乎擁有最高的90Sr濃集因子(約1 000 L/kg),同時具有較易大量獲取、固定附著生長、連續高分辨率記錄、前處理簡單快速等優點,很可能是海洋中90Sr可靠的指示生物。造礁珊瑚中90Sr研究將有利于揭示人工放射性核素的源匯過程,同時為我國海洋放射性監測方案和相關標準導則的優化和完善提供有益的參考。
    英文摘要:
          90Sr is recognized to be one of most important artificial radionuclides. A huge amount of radioactive substance (e.g., 90Sr) was released into marine environment after the Fukushima Nuclear Accident (FNA). High 90Sr activity was still observed in the treated wastewater which was stored on site in many tanks. However, 90Sr was rarely investigated in marine environment due to its complicated and time-consuming analytical procedure after the FNA, constraining a comprehensive understanding of the fate of 90Sr in marine environment. We discussed the 90Sr activity and environmental half-life (EHL) in seas surrounding Japan (SSJ) and the South China Sea (SCS) on the basis of previous data and our 90Sr data in seawater and marine biotas (e.g., sargassum, shrimp, oyster, mangrove, reef coral) collected from the SCS during 2015-2018. We found that the EHL of 90Sr in the SSJ was 15.4 years during 1975-2010. 90Sr in the SSJ was significantly elevated after the FNA. Radiation dose rate of 90Sr on marine fish was increased by five orders of magnitude after the FNA relative to the baseline before the FNA. As the downstream basin of the North Pacific Subtropical Gyre, the SCS was not identified with noticeable 90Sr-derived from the FNA. The EHL of 90Sr in the SCS was calculated to be 26.7 years during 1984-2018 based on the compilation of historical 90Sr data. The contrasting patterns of the EHL of 90Sr and 137Cs in the marginal seas and open oceans were attributed to the distinct sources (river input) and sinks (marine biological pump) of 90Sr and 137Cs. In the context of challenge of 90Sr analytical method in marine environment, extremely high 90Sr concentration factor (around 1000 L/kg) was observed in the reef coral skeleton after comparing with concentration factors of 90Sr in more than 10 kinds of marine biotas. Additionally, reef coral is potential to be a reliable 90Sr marine bioindicator with other advantages of easy availability in large quantity, growth at a fixed location, continue record with high resolution, and simple pretreatment. The study of 90Sr in reef coral will not only help to reveal distinct sources and sinks of artificial radionuclides in marine environment, but also provide valuable insights to optimization and improvement of standards/guidelines of marine radioactivity monitoring program.
    查看全文   查看/發表評論  下載PDF閱讀器
    關閉
    微信公共賬號
    乱中年女人伦av三区