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Contribution of sediment oxygen demand to hypoxia development off the Changjiang Estuary

机译：长江口外底泥需氧量对缺氧发展的贡献

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This study evaluates the contribution of sediment oxygen demand (SOD) to hypoxia development off the Changjiang Estuary based on SOD measurements from onboard chamber incubations and numerical experiments. Onboard core incubations were conducted for samples collected from four stations in the Yellow Sea (YS) and the East China Sea (ECS) during cruises in June, August and October 2006. The measured SOD ranges widely from 9.1 to 62.5 mmol O-2 m(-2) d(-1) with a mean rate of 22.6 +/- 16.4 mmol O-2 m(-2) d(-1), and the maximum occurring in August. The rates in regions experiencing hypoxia vary from 13.5 to 24.0 mmol O-2 m(-2) d(-1) with a mean of 18.9 +/- 4.6 mmol O-2 m(-2) d(-1). Additionally, the vertical oxygen flux was calculated from profile measurements at a hypoxic mooring station adjacent to the Changjiang Estuary on September 3rd. and 4th, 2006. The oxygen flux across the pycnocline was about 3.1 mmol O-2 m(-2) d(-1), much lower than the SOD, implying that the low oxygen supply associated with stratification promotes the formation and maintenance of hypoxia in bottom waters. The one-dimensional numerical experiments configured for stratified and well-mixed water columns further confirm that stratification is necessary for the development and persistence of hypoxia, while SOD is a major oxygen sink below the pycnocline. Integrated over June to August, the amount of oxygen loss beneath the pycnocline due to SOD is equal to 116%-148%, 80%-142% and 82%-179% of the total net oxygen loss in the southern hypoxic region, northern hypoxic region and the middle shelf, respectively. During June to August when hypoxia develops, SOD in the northern and southern regions has similar magnitude. The Changjiang Diluted Water (CDW) promotes hypoxia formation in both regions, while the oxygen advection caused by the Taiwan Warm Current (TWC) would alleviate hypoxia formation especially for the southern hypoxic region. (C) 2017 Elsevier Ltd. All rights reserved.
机译：这项研究基于船上舱内培养物的SOD测量和数值实验，评估了沉积物需氧量（SOD）对长江口低氧发展的贡献。在2006年6月，8月和10月的航行期间，对从黄海（YS）和东海（ECS）四个站点收集的样品进行了船上核心孵育。测得的SOD范围从9.1至62.5 mmol O-2 m （-2）d（-1），平均发生率为22.6 +/- 16.4 mmol O-2 m（-2）d（-1），最大值发生在八月。缺氧区域的发生率从13.5到24.0 mmol O-2 m（-2）d（-1）不等，平均值为18.9 +/- 4.6 mmol O-2 m（-2）d（-1）。此外，垂直氧气通量是根据9月3日在长江口附近的低氧系泊站的剖面测量值计算得出的。 ，并于2006年4月4日进行。通过比诺可林的氧气通量约为3.1 mmol O-2 m（-2）d（-1），远低于SOD，这表明与分层相关的低氧气供应促进了烟碱的形成和维持。底部水域缺氧。为分层和充分混合的水柱配置的一维数值实验进一步证实，分层对于缺氧的发展和持续性是必要的，而SOD是比多菌灵以下的主要氧汇。综合6月至8月的数据，SOD导致比索可林以下的氧气损失量相当于南部低氧地区，北部的总净氧气损失的116％-148％，80％-142％和82％-179％低氧区和中层架。在缺氧的6月至8月期间，北部和南部地区的SOD大小相似。长江稀释水（CDW）促进了两个地区的缺氧形成，而台湾暖流（TWC）引起的氧气对流将减轻缺氧的形成，特别是对于南部缺氧地区。 （C）2017 Elsevier Ltd.保留所有权利。

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