Seasonal hypoxia and temperature inversions in a tropical bay
Seasonal hypoxia and temperature inversions in a tropical bay
复制标题
DOI：
10.1002/lno.12196
复制
发表时间：
2022-08-03
影响因子：
4.5
通讯作者：
Pawlak, Geno
中科院分区：
文献类型：
--
作者：
Adelson, Anne E.;Altieri, Andrew H.;Pawlak, Geno
溶解氧（DO）是一个至关重要的生态变量，由于海洋变暖和富营养化的综合影响，海洋缺氧的流行预计将增加。热应力可与缺氧同时发生，特别是在热带系统中，并可加剧其影响。我们研究的物理过程是重要的，在调节缺氧和逆温在巴伊亚阿尔米兰特，半封闭的热带海湾的巴拿马加勒比海沿岸。在巴伊亚阿尔米兰特7个地点的10年观测记录显示，季节性温度倒置和缺氧的深度，往往同时发生。这些特征在后湾更为严重和持久，尽管它们在整个巴伊亚阿尔米兰特都有发生。DO减少对应于高淡水输入的时期，包括直接降水，导致强烈的盐度分层，隔离底层沃茨，使生物需氧量降低DO。证据表明，横向平流可以有助于复氧事件，和近底溶解氧和底部盐度之间的关系，在湾中和湾后是一致的深水更新作为底层水通风的机制。这些缺氧和逆温事件影响的生物群落的巴伊亚阿尔米兰特，和物理动力，调节这些一致的和持续的压力，海洋生物可能存在于其他浅，热带河口。
Dissolved oxygen (DO) is a critically important ecological variable, and the prevalence of marine hypoxia is expected to increase due to the combined effects of ocean warming and eutrophication. Thermal stress can co-occur with hypoxia, especially in tropical systems, and can exacerbate its effects. We examine the physical processes that are important in regulating hypoxia and temperature inversions in Bahia Almirante, a semi-enclosed tropical embayment on the Caribbean coast of Panama. A 10-yr record of observations at 7 locations within Bahia Almirante reveals seasonal temperature inversions and hypoxia at depth that often co-occur. These features are more severe and persistent in the back bay, though they occur throughout Bahia Almirante. DO reductions correspond to periods with high freshwater input, including direct precipitation, resulting in strong salinity stratification that isolates bottom waters, allowing biological oxygen demand to draw down DO. Evidence indicates that lateral advection can contribute to reoxygenation events, and the relationship between near bottom DO and bottom salinities in the mid bay and back bay is consistent with deep-water renewal as the mechanism for bottom water ventilation. These hypoxia and temperature inversion events impact the biological communities of Bahia Almirante, and the physical dynamics that regulate these coincident and persistent stressors for marine organisms are likely present in other shallow, tropical estuaries.