The Characteristics of Oxygen Deficient Water Mass in Gamak Bay
The Characteristics of Oxygen Deficient Water Mass in Gamak Bay
复制标题
伽马克湾缺氧水体特征
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
P. Lee
中科院分区：
文献类型：
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作者：
Jeong‐Bae Kim;Sang;Jun Yu;Yang;C. Jung;P. Lee
为弄清伽玛克湾缺氧水团的形成过程和特征，从2005年6月17日至9月12日每周对伽玛克湾的缺氧水团进行观测。外湾表层水温显著低于内湾，而湾中区底层水温高于外湾和内湾。期间形成强烈的水团垂直层结，在3~5m深度观察到温跃层。内湾7月初开始出现底层缺氧，8月初逐渐向湾内中心区扩散。水体的平均透明度系数为4.0m，平均光衰减系数为0.47。底层营养盐和叶绿素的平均浓度显著高于表层，且内湾显著高于外湾。在底层缺氧形成过程中，底层沉积物的氧气穿透深度极浅，底层沉积物的耗氧速率低于缺氧水体消失区域。底层溶解氧浓度与营养盐浓度呈显著负相关，而表层溶解氧浓度与营养盐浓度关系不显著。底水中氧的损失增加是由于沉积物中耗氧速率的增加和微生物对有机物的分解。
To clarify the formation process and characteristics of oxygen deficient water mass in Gamak Bay, oxygen deficiency was weekly observed from 17 June to 12 September 2005. Surface water temperature was significantly lower in the outer bay than in the inner bay, whereas the bottom water temperature was higher in the central area of bay than in the outer and inner bay. The vertical stratification of water mass was strongly formed during the period, and thermocline was observed between 3 and 5m deep. The oxygen deficiency in the bottom layer began to appear at early July in the inner bay and gradually spread to the center area of the bay in early August. The mean transparency and light attenuation coefficient() in water mass was 4.0m and 0.47, respectively. Average concentrations of nutrient and chlorophyll in the bottom layer were significantly higher than those in surface, and those concentrations were significantly higher in the inner bay than in the outer bay. During the formation of oxygen deficiency in the bottom layer, oxygen penetration depth in the bottom sediment were extremely shallow, and oxygen consumption rate in the bottom sediment were lower than that in the area where oxygen deficient water mass disappeared. Dissolved oxygen concentrations in the bottom layer are negatively correlated with nutrient concentrations, whereas those in the surface layer did not show a significant relationship with nutrient concentrations. Elevated loss of oxygen in the bottom water mass was attributed to the increase of the oxygen consumption rates in sediments and the decomposition of organic matter by microorganism.