| 摘要: |
| 根据黄海1977年5月至1981年11月温度、盐度和溶解氧含量调查资料，采用旋转经验正交函数（REOF）、调和分析和延迟相关分析等方法，分析了黄海溶解氧含量场季节循环时空模态与机制.黄海溶解氧含量场季节循环主要存在两种时空模态：第一模态是对海气氧通量、沿岸流、涡旋涌升流和温度、盐度场模态以及生物活性组分（BAC）氧化与光合作用、沉积物需氧量（SOD）季节变化的响应，空间分量为准三层垂直结构，时间分量季节变化位相垂直传播有两种形式：自表层向深层和由底层向浅层；第二模态是对离岸流、冷水团和温度、盐度模态以及生物活性组分氧化与光合作用、沉积物需氧量季节变化的响应，空间分量为五层垂直结构，时间分量季节变化位相自表层传播至底层约需3个月.黄海温度季节变化对溶解氧含量季节变化影响的敏感程度大于盐度.春夏季生物活性组分强耗氧、饱和溶解氧弱减氧作用的垂直差异以及沉积物需氧量强盛是出现夏季溶解氧含量垂直最大值现象的主要机制.在平均年度中，表层增氧月数多于减氧；10m层增减氧月数相同；20、30 m和底层增氧月数少于减氧.对于平均年度表层海气氧通量，黄海是“源”，最大“源”通量出现在春季；渤海是“汇”，最大“汇”通量出现在冬季.黄海溶解氧含量季节变化位相多迟于渤海约1个月. |
| 关键词: 物理海洋学 溶解氧含量场 季节循环 时空模态 溶解氧含量垂直最大值分布 REOF分析 黄海 |
| DOI：10.3969/J.ISSN.2095-4972.2016.01.001 |
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| 基金项目:国家海洋公益性科研专项资助项目（201205010）；山东省海洋生态环境与防灾减灾重点实验室资助项目（2011011） |
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| Mechanism and spatio temporal mode on the seasonal cycle of dissolved oxygen content fields in the Yellow Sea |
| SHI Qiang |
| (Shandong Province Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation，Qingdao 266033，China;North China Sea Environmental Monitoring Center， SOA， Qingdao 266033，China; Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology，SOA，Qingdao 266033，China) |
| Abstract: |
| Based on temperature， salinity and dissolved oxygen content survey data from May 1977 to November 1981， mechanism and spatiotemporal mode of dissolved oxygen content seasonal cycle of the Yellow Sea were studied with methods of Rotated Empirical Orthogonal Function （REOF）， harmonic analysis and delay correlation analysis. The result showed that the seasonal cycle of dissolved oxygen content in the Yellow Sea was divided into two spatio-temporal modes. The first mode was response to air-sea oxygen flux， coastal current， vortex upwelling， salinity and temperature field modes， oxidation and photosynthesis of biological active components and seasonal change of sediment oxygen demand. The spatial variable component is quasi-three-layer vertical structure. The seasonal change phase of temporal variable component included surface towards deep layer and bottom towards shallow layer. The second mode was response to rip current， cold water mass， modes of temperature and salinity， oxidation and photosynthesis of biological active components and seasonal change of sediment oxygen demand. The spatial variable component is five-layer vertical structure and it needed 3 months to spread from surface to bottom in seasonal change phase of temporal variable component. In the Yellow Sea， seasonal change of temperature has stronger impact than salinity on seasonal change of dissolved oxygen content. The main mechanisms of maximum dissolved oxygen content appeared in summer were vertical gap formed from greater oxygen consuming of biological active components and weaker oxygen reduction of saturated dissolved oxygen content and greater sediment oxygen demand between spring and summer. Annually， month number of oxygen enhancing is larger than that of oxygen reducing. Month number of oxygen enhancing is the same with that of oxygen reducing in 10m layer. Month number of oxygen enhancing is smaller than that of oxygen reducing in 20 m， 30 m and bottom layer. For annual air-sea oxygen flux， the Yellow Sea was the source which the largest flux appeared in spring while Bohai Sea was the sink which the largest flux were in winter. Mostly seasonal change phase of dissolved oxygen content in the Yellow Sea was about one month later than in Bohai Sea． |
| Key words: physical oceanography dissolved oxygen content field seasonal cycle spatio temporal mode vertical maximum distribution of dissolved oxygen content REOF analysis Yellow Sea |
