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根据1978年1月—1981年11月渤海温盐、溶解氧场逐月调查资料,采用旋转经验正交函数(REOF)、最大熵谱分析、调和分析等方法,研究了渤海表底层溶解氧和表观耗氧量场季节循环时空模态与机制。渤海表底层溶解氧(DO)场主要有2种时空模态:表、底层DO场第一模态季节变化主要由表、底层温度、盐度场第一模态控制;表、底层DO场第二模态季节变化主要由表、底层温度场第二模态控制。渤海表、底层表观耗氧量(AOU)场季节变化主要有2种时空模态:季节循环时间为增氧非对称型的表、底层AOU第一模态;季节循环时间为耗氧非对称型的表、底层AOU第二模态。渤海表层存在连续7个月的自然贫氧和富氧海域,底层存在连续8、9个月的自然贫氧和富氧海域。在增耗氧强盛期,生物生耗氧为主,饱和增减氧次之。在增耗氧衰弱-增强期,饱和增减氧为主,生物生耗氧次之。渤海环流、浮游生物分布、黄河口入海月径流量、海水饱和溶解氧等季节变化是驱动AOU模态季节变化的主要因素。渤海存在较强的季节性生物生耗氧过程。
According to monthly survey data of warm salt and dissolved oxygen in the Bohai Sea from January 1978 to November 1981, using rotating empirical orthogonal function (REOF), maximum entropy spectrum analysis and harmonic analysis, the effects of dissolved oxygen Apparent Oxygen Demand Field Seasonal Circulation Temporal and Spatial Modalities and Mechanisms. There are mainly two kinds of spatio-temporal modes of DO in the bottom of the Bohai Sea table: the seasonal changes of the first modal DO field are mainly controlled by the first mode of the table, the bottom temperature and the salinity field; Two modal seasonal changes mainly by the table, the bottom of the second mode of temperature field control. There are mainly two kinds of spatio-temporal modes of seasonal changes in the apparent oxygen demand (AOU) field in the Bohai Sea: the seasonal circulation time is the asymmetric aerosols and the first AOU in the bottom; the seasonal circulation time is the asymmetric oxygen consumption Type table, the bottom AOU second modality. There was a natural oxygen-poor and oxygen-rich sea area in the Bohai Sea for seven consecutive months. There were natural oxygen-poor and oxygen-rich sea areas in the bottom for 8,9 months. Oxygen consumption in the prosperous period, bio-oxygen-based, oxygen saturation or reduction times. Oxygen depletion in the increase - enhanced period, the main increase or decrease in oxygen, followed by biological oxygen consumption. The seasonal variations of Bohai Sea circulation, plankton distribution, monthly runoff of the Yellow River estuary into the sea and saturated dissolved oxygen of seawater are the main factors driving seasonal changes of AOU modal. Bohai Sea there is a strong seasonal biological oxygen consumption process.