| 江濤，徐勇，劉傳霞，張豔，丁東生，孫雪梅，陳聚法，陳碧鵑，趙俊，曲克明.渤海中部海域低氧區的發生記錄.漁業科學進展，2016,37（4）：1-6 |
| 渤海中部海域低氧區的發生記錄 |
| Report on the Occurrence of Hypoxia in the Central Bohai Sea |
| 投稿時間：2015-06-18 修訂日期：2015-07-21 |
| DOI：10.11758/yykxjz.20150618002 |
| 中文關鍵字： 渤海中部海域 溶解氧 低氧 富營養化 |
| 英文關鍵字： The central Bohai Sea Dissolved oxygen Hypoxia Eutrophication |
| 基金項目：農業部專項“渤海生態環境監測評估”（13-Q52201302）和黃海水產研究所級基本科研業務費項目（20603022015002）共同資助 |
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| 摘要點擊次數： 4951 |
| 全文下載次數： 4836 |
| 中文摘要： |
| 2014年8月對渤海中部海域的水文（溫度、鹽度）、化學（溶解氧DO、營養鹽和化學耗氧量COD）和生物要素（葉綠素a Chl-a）的空間分佈進行了調查。研究了該海域底層水體低氧（DO< 3.0 mg/L）的分佈特徵，深入分析了低氧區發生的關鍵因素。結果顯示，底層水體DO濃度最小值為2.30 mg/L，低氧面積達1200 km2，呈西北–東南走向。調查海域的西部和西南海域呈現出明顯的溫度層化，尤其在低氧區附近形成了一個表層與底層水體溫度差（δT）>5℃的區域，δT最高值達到7.3℃。水體密度層化與溫度層化特徵相似，在低氧區附近形成了一個底表層密度差（δρ）>2 g/L的等值線閉合圈。溫度層化是低氧產生的主要物理因素。表層水體COD高值區主要分佈在調查海域的西部，覆蓋大部分的低氧海域。表層水體中的Chl-a（> 4μg/L）和PO43--P（> 6μg/L）濃度高值區主要分佈在調查海域的西南部，部分與低氧區重合。本研究可為探索渤海海域富營養化演變過程提供借鑒。 |
| 英文摘要： |
| Hypoxia in the central areas of the Bohai Sea was reported for the first time in this study.The survey in August 2014 suggested that the hypoxic zone was 1200 km2 in area and the minimum DO concentration was 2.30 mg/L. The hypoxic zone was on the southwest side of the investigated area（119.1°–119.6°E，38.3°–38.8°N）.The DO（4 mg/L）isoline indicated that the hypoxic layer reached 10 m under the water.There were differences in the temperature and density between the surface and the bottom layer（δT andδρ），implying the formation of strong pycnocline in the hypoxic zone.TheδT isoline of 5℃mainly occurred in the vicinity of hypoxic zone with the highestδT value of 7.3℃.The density difference between the bottom and the surface layer has a similar spatial pattern withδT. By contrast，the salinity difference between the bottom and the surface layer was small（< 0.8）in the investigated areas.These results suggested that thermal stratification could be more influential than saline stratification in controlling the occurrence of hypoxia.The COD concentration was high（< 0.9 mg/L）on the southwest side of the investigated area that accounted for the majority of the hypoxic zone.In addition，high level of Chl-a（> 4μg/L）and PO43--P（> 6μg/L）was also observed in this area.We proposed that the formation of hypoxia could be a result of combined factors including the inflow from the Yellow Sea，the topography，and especially，the thermal stratification and in situ production. |
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