Benthic Oxygen Fluxes Measured by Eddy Covariance in Permeable Gulf of Mexico Shallow-Water Sands
Benthic Oxygen Fluxes Measured by Eddy Covariance in Permeable Gulf of Mexico Shallow-Water Sands
复制标题
通过墨西哥湾可渗透浅水沙中涡流协方差测量底栖氧通量
DOI：
10.1007/s10498-016-9305-3
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发表时间：
2016
影响因子：
1.6
通讯作者：
M. Huettel
中科院分区：
文献类型：
--
作者：
L. Chipman;P. Berg;M. Huettel
沉积物-水界面的氧通量反映了沿海沉积物中的初级生产和有机物降解，从而提供了可用于评估生态系统功能、碳循环和对沿海富营养化反应的数据。在这项研究中，使用水涡协方差技术测量了墨西哥湾东北部具有高渗透性沙质沉积物的浅海海域的海底-水柱氧通量，目前缺乏这方面的数据。将暴露在海浪中的墨西哥湾地点的氧通量与受保护的海湾地点的氧通量进行了为期4年、覆盖四季的比较。共进行了17次白天部署和14次夜间部署，产生了408次通量测量(每次14.5分钟)。海湾地区的年平均释氧量和摄氧量(平均标准误差)分别为191.00±0.66和−191.00±2.45mmolm/m−2/d−1；湾区站点的年平均释氧量和摄氧量(−152±0.01mmol.m/m−2)/d−1。观察到氧通量的季节变化，通常在春季出现高速率，而在夏季出现低速率。两个部位的平均氧释放量与摄氧量之比接近1(海湾：0.9，海湾：1.0)。通量对光、温度、底流速度和波浪作用(显著波高)变化的密切响应记录了紧密的物理-生物、海底-上层耦合。沉积物吸氧量随温度的升高而增加，对应的Q10温度系数为1.4±100.3。流速的增加导致了摄氧量的增加(流量加倍时增加了1-6倍)，这是由于有机物和电子受体向可渗透沉积物的传输增强了。底栖生物的光合作用产生和从沉积物中释放的氧气在通量测量的时间尺度(分钟)上受到光强度的调制。本研究中测量的通量有助于沿海快速发展区域的基线数据，可用于大规模评估和估计碳转化。
Oxygen fluxes across the sediment–water interface reflect primary production and organic matter degradation in coastal sediments and thus provide data that can be used for assessing ecosystem function, carbon cycling and the response to coastal eutrophication. In this study, the aquatic eddy covariance technique was used to measure seafloor–water column oxygen fluxes at shallow coastal sites with highly permeable sandy sediment in the northeastern Gulf of Mexico for which oxygen flux data currently are lacking. Oxygen fluxes at wave-exposed Gulf sites were compared to those at protected Bay sites over a period of 4 years and covering the four seasons. A total of 17 daytime and 14 nighttime deployments, producing 408 flux measurements (14.5 min each), were conducted. Average annual oxygen release and uptake (mean ± standard error) were 191 ± 66 and −191 ± 45 mmol m−2 day−1 for the Gulf sites and 130 ± 57 and −152 ± 64 mmol m−2 day−1 for the Bay sites. Seasonal variation in oxygen flux was observed, with high rates typically occurring during spring and lower rates during summer. The ratio of average oxygen release to uptake at both sites was close to 1 (Bay: 0.9, Gulf: 1.0). Close responses of the flux to changes in light, temperature, bottom current velocity, and wave action (significant wave height) documented tight physical–biological, benthic–pelagic coupling. The increase of the sedimentary oxygen uptake with increasing temperature corresponded to a Q10 temperature coefficient of 1.4 ± 0.3. An increase in flow velocity resulted in increased oxygen uptake (by a factor of 1–6 for a doubling in flow), which is explained by the enhanced transport of organic matter and electron acceptors into the permeable sediment. Benthic photosynthetic production and oxygen release from the sediment was modulated by light intensity at the temporal scale (minutes) of the flux measurements. The fluxes measured in this study contribute to baseline data in a region with rapid coastal development and can be used in large-scale assessments and estimates of carbon transformations.
影响因子：
2.7
作者：
Berg, Peter;Glud, Ronnie N.;Kitazato, Hiroshi
通讯作者：
Kitazato, Hiroshi
影响因子：
2.5
作者：
Glud, Ronnie N.;Berg, Peter;Rysgaard, Soren
通讯作者：
Rysgaard, Soren