Sediment and Lower Water Column Oxygen Consumption in the Seasonally Hypoxic Region of the Louisiana Continental Shelf
Sediment and Lower Water Column Oxygen Consumption in the Seasonally Hypoxic Region of the Louisiana Continental Shelf
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DOI：
10.1007/s12237-010-9351-9
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发表时间：
2011-09
影响因子：
2.7
通讯作者：
M. Murrell;J. Lehrter
中科院分区：
文献类型：
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作者：
M. Murrell;J. Lehrter
我们报告综合测量沉积物耗氧量（SOC）和底层水浮游生物群落呼吸速率（WR）在2003年至2007年的路易斯安那州大陆架（LCS）缺氧每年发展的8个航次。巡航时的平均SOC范围为3.9至25.8 mmol O2m−2day−1，而WR范围为4.1至10.8 mmol O2m−3day−1。密度跃层以下的总呼吸速率范围为46.4至104.5 mmol O2m−2day−1。在一般情况下，密度跃层以下的呼吸表现出较低的变化在一个大的地理和时间范围内，并没有表现出明确的空间或年际模式。SOC强烈限制溶解氧（DO）在上覆水，而WR是不敏感的低DO，参数化未来的模型可能是有用的关系。的组成部分的措施，WR和SOC，是类似于大多数以前的测量，无论是从LCS和其他浅河口和沿海环境。SOC对总密度跃层以下呼吸的贡献平均为20 ± 4%，这一发现与之前的几项LCS研究不同，但得到了更广泛的河口和海洋文献的充分支持。这里报告的数据大大增加了LCS的可用数据，从而有助于更好地了解LCS上的氧动力学。
We report integrated measurements of sediment oxygen consumption (SOC) and bottom water plankton community respiration rates (WR) during eight cruises from 2003 to 2007 on the Louisiana continental shelf (LCS) where hypoxia develops annually. Averaged by cruise, SOC ranged from 3.9 to 25.8 mmol O2m−2day−1, whereas WR ranged from 4.1 to 10.8 mmol O2m−3day−1. Total below-pycnocline respiration rates ranged from 46.4 to 104.5 mmol O2m−2day−1. In general, below-pycnocline respiration showed low variability over a large geographic and temporal range, and exhibited no clear spatial or inter-annual patterns. SOC was strongly limited by dissolved oxygen (DO) in the overlying water; whereas, WR was insensitive to low DO, a relationship that may be useful for parameterizing future models. The component measures, WR and SOC, were similar to most prior measurements, both from the LCS and from other shallow estuarine and coastal environments. The contribution of SOC to total below-pycnocline respiration averaged 20 ± 4%, a finding that differs from several prior LCS studies, but one that was well supported from the broader estuarine and oceanic literature. The data reported here add substantially to those available for the LCS, thus helping to better understand oxygen dynamics on the LCS.