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南黄海夏季低氧、贫氧长期时空演变与机制
石强
0
(1.海洋溢油鉴别与损害评估技术国家海洋局重点实验室,山东 青岛 266033;2.国家海洋局北海环境监测中心,山东 青岛 266033;3.山东省海洋生态环境与防灾减灾重点实验室,山东 青岛 266033)
摘要:
根据1977—2016年历年8月南黄海断面标准层调查资料,采用时空分析等方法,研究了南黄海断面8月份低氧、贫氧长期时空演变与机制。溶解氧(DO)含量与表观耗氧量(AOU)年际变化分别有4种主要时空模态,溶解氧含量第一模态与表观耗氧量第一、二模态是断面海域显著线性低氧、贫氧趋势的主要影响分量,溶解氧第二~四模态与表观耗氧量第三、四模态为准平衡态长期变化。南黄海夏季低氧、贫氧变化的主要机制是生物活性组分(BAC)耗氧过程增多和增强,低氧和贫氧准平衡态长期变化的主要机制是生物活性组分、饱和溶解氧与海流输送的增减氧效应处于准平衡态状态。黄海冷水团中平均溶解氧含量、表观耗氧量存在显著线性低氧、贫氧趋势。南黄海夏季表层海气氧通量强度显著线性减弱,并且呈现“氧源”、“氧汇”相间变化。黄海夏季风生环流、海气氧通量强度逐渐减弱为黄海夏季低氧、贫氧发展提供了物理条件。目前黄海溶解氧含量、表观耗氧量场季节循环时空分布已经发生显著改变。
关键词:  物理海洋学  溶解氧含量  表观耗氧量  低氧  贫氧  时空模态  南黄海
DOI:
基金项目:海洋溢油鉴别与损害评估技术国家海洋局重点实验室资助项目(2015010)
Mechanism and long-term spatio-temporal evolution on summertime hypoxic and anoxia in the South Yellow Sea
SHI Qiang
(1. Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology, SOA, Qingdao 266033, China;2.North China Sea Environmental Monitoring Center, SOA, Qingdao 266033, China; 3.Shandong Province Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation, Qingdao 266033, China)
Abstract:
Based on the survey data of the South Yellow Sea section in August of 1977 to 2016, the spatial and temporal evolution and mechanism of hypoxia and anoxia were studied by spatio-temporal analysis etc. The results show that the interannual changes of dissolved oxygen content and apparent oxygen utilization have 4 main spatio-temporal modes. The first mode of dissolved oxygen content and the first and the second mode of apparent oxygen utilization are the main influence components of the trend of the significant linear hypoxia and anoxia in the sectional areas. The second to the fourth mode of dissolved oxygen content and the third and the fourth mode of apparent oxygen utilization are the longterm variations of the quasiequilibrium state. The main mechanism of the summer hypoxia and anoxia changes in the South Yellow Sea is the increase and enhancement of the oxygen consumption process of the bioactive component (BAC). The main mechanism of longterm hypoxia and anoxia is that the effect of oxygen enrichment and oxygen reduction, due to the bioactive components, saturated dissolved oxygen and ocean current transport, is in quasiequilibrium state. The mean dissolved oxygen content and apparent oxygen utilization in the Yellow Sea cold water mass appears a significant linear trend of hypoxia and anoxia. The intensity of seaair oxygen flux in the sea surface in the South Yellow Sea in summer is linearly decreased and the “oxygen source” and “oxygen sink” change interactionally. The summer winddriven circulation and seaair oxygen flux gradually weakened in the Yellow Sea, which provides physical conditions for the development of summer hypoxia and anoxia in the Yellow Sea. The temporal and spatial distribution of the seasonal cycle of dissolved oxygen content and apparent oxygen utilization field in the Yellow Sea has been significantly changed in recent years.
Key words:  physical oceanography  dissolved oxygen content  apparent oxygen utilization  hypoxic  anoxia  spatio-temporal mode  South Yellow Sea

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