Abstract

A subsurface oxygen minimum layer (OML) in intermediate water is identified and characterized in Rivers Inlet, a fjord on British Columbia’s central coast, using data from 1998 to 2018. The OML was observed in most years from May to September and was most persistent at the middle and head of the fjord. The Rivers Inlet OML develops in three stages: (i) in early spring, the cessation of winter storms from downwelling-favourable winds stops the ventilation of the water column; (ii) throughout spring and summer, the remineralization of organic matter, likely primarily phytoplankton, consumes oxygen in the intermediate waters; (iii) in late spring, deep-water renewal by oxygenated offshore water forms the base of the OML inside the inlet. The strength and persistence of the OML vary interannually, mainly due to variability in hemispheric-scale winds and primary production. In some years, the OML was hypoxic, which could influence the local marine ecosystem. Changes to downwelling, upwelling, or primary production in Rivers Inlet could affect the OML in the future.

中文翻译：

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确定不列颠哥伦比亚省河流入口的季节性地下最低氧含量

摘要

使用 1998 年至 2018 年的数据，在不列颠哥伦比亚省中部海岸的峡湾 Rivers Inlet 中识别并表征了中间水域中的地下最低氧层 (OML)。 OML 在 5 月至 9 月的大多数年份中观测到，最持久的时间为峡湾的中部和头部。河流入口 OML 分三个阶段发展：(i) 早春，冬季风暴停止，顺风顺风停止了水体的通风；(ii) 在整个春季和夏季，有机物质（可能主要是浮游植物）的再矿化会消耗中间水域中的氧气；(iii) 在晚春，含氧近海水的深水更新形成了入口内 OML 的基础。OML 的强度和持久性每年都会有所不同，主要是由于半球规模的风和初级生产的变化。在某些年份，OML 是缺氧的，这可能会影响当地的海洋生态系统。Rivers Inlet 下流、上流或初级生产的变化可能会影响未来的 OML。