| LU Wenhai,XIANG Xianquan,YANG Lu,XU Yan,LI Xiao,LIU Shuming. 2017. The temporal-spatial distribution and changes of dissolved oxygen in the Changjiang Estuary and its adjacent waters for the last 50 a. Acta Oceanologica Sinica, 36(5):90－98 |
| The temporal-spatial distribution and changes of dissolved oxygen in the Changjiang Estuary and its adjacent waters for the last 50 a |
| 近50年来长江口及邻近海域溶解氧的时空分布变化 |
| Received:July 22, 2016 |
| DOI：10.1007/s13131-017-1063-6 |
| Key words:coastal region long-term trend dissolved oxygen hypoxia |
| 中文关键词: 长江口及邻近海域 时空分布 溶解氧 低氧 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LU Wenhai | Ocean University of China, Qingdao 266100, China
National Marine Data and Information Service, State Oceanic Administration, Tianjin 300000, China | | | XIANG Xianquan | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300000, China | xxquan@tju.edu.cn | | YANG Lu | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300000, China | | | XU Yan | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300000, China | | | LI Xiao | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300000, China | | | LIU Shuming | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300000, China | |
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| Abstract: |
| The Changjiang Estuary and its adjacent waters form one of the most important estuarine and coastal areas in China. Multi source and long-term data are assembled to examine the temporal-spatial distribution features of dissolved oxygen (DO) in the Changjiang Estuary and its adjacent waters for the past 50 a. The results show that the DO concentration in the surface of different seasons generally stays stable, while the DO concentration in winter displays a slight increase for the last 50 a. The DO average concentration in winter and spring varies from 7 to 11 mg/L, and in summer and autumn from 6 to 8 mg/L. Hypoxic values first appear in May, and low DO value plume can be observed on the bottom in spring along coastal areas of Zhejiang and Fujian Provinces, China. In summer, the plume advances northward, and the hypoxic intensity of northern transects is much higher than southern transects. Until autumn, hypoxia areas fade away little by little, and completely disappear in winter. Within last 50 a, hypoxia in the Changjiang Estuary and its adjacent waters starts to appear in the 1980s. Since 2000, the degree of hypoxia has increased seriously and the distribution depth has become smaller. It is performed based on a large amount of historical data, and the research results will be of great significance to further study on the dynamic development of hypoxia around the Changjiang Estuary. |
| 中文摘要: |
| 长江口及邻近海域是我国最重要的河口海岸区域之一。基于多源、长时间序列的溶解氧资料，本文对近50年来长江口及邻近海域溶解氧的时空分布特征进行了研究。结果表明，近50年来，长江口及邻近海域表层溶解氧基本保持稳定，仅冬季呈现出一定的上升趋势。冬、春两季溶解氧浓度范围在7-11 mg/L，夏、秋两季为6-8 mg/L。长江口及邻近海域低氧值首先出现于5月，浙闽沿岸底层海域形成低氧水舌。水舌在夏季不断向北推进，北部断面低氧程度明显高于南部断面。到了秋季，低氧区逐渐消退，至冬季完全消失。在过去的50年中，长江口及邻近海域的低氧现象始于20世纪80年代。2000年起，低氧程度逐渐加深，低氧分布深度逐渐升高。本文基于大量的溶解氧历史数据开展研究，研究结论对于探讨长江口及邻近海域低氧区的发展变化具有非常重要的意义。 |
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