Bottom mixed layer oxygen dynamics in the Celtic Sea
Bottom mixed layer oxygen dynamics in the Celtic Sea
复制标题
凯尔特海底部混合层氧动态
DOI：
10.1007/s10533-020-00662-x
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发表时间：
2020
期刊：
影响因子：
4
通讯作者：
Hull T
中科院分区：
文献类型：
--
作者：
Hull T
按季节分层的大陆架海是生产力高、经济重要的环境，人类活动给它们带来了相当大的压力。至少自二十世纪中叶以来，由于人为强迫，全球溶解氧浓度迅速下降。氧气消耗同时与大气中碳的循环有关，氧气是碳再矿化和二氧化碳释放的代用品。在季节性分层的海洋中，底层混合层(BML)部分地与大气隔离，因此受到耗氧过程、垂直平流和水平平流之间的相互作用的控制。耗氧率在空间和时间上都是动态的，但基于孵化的技术往往会错过这些动态。在这里，我们采用贝叶斯方法从高分辨率的氧时间序列确定总的BML耗氧率。这既包含了我们对控制氧气库存的各种过程的知识，也包含了我们的不确定性。总BML速率综合了水柱和沉积物界面上的两个过程。这些观测跨越了凯尔特海的分层时期，并跨越了沙质和泥质沉积物类型。我们展示了水平平流、潮汐强迫和垂直混合如何在层结期间的不同时间控制底层混合层的氧浓度。我们的泥沙场地显示出由海床频繁的再悬浮或通风驱动的春季-小潮周期的耗氧量变化。我们看到长期垂直混合增加的证据，这提供了支持所观察到的高消耗率所需的通风。
The seasonally stratified continental shelf seas are highly productive, economically important environments which are under considerable pressure from human activity. Global dissolved oxygen concentrations have shown rapid reductions in response to anthropogenic forcing since at least the middle of the twentieth century. Oxygen consumption is at the same time linked to the cycling of atmospheric carbon, with oxygen being a proxy for carbon remineralisation and the release of CO2. In the seasonally stratified seas the bottom mixed layer (BML) is partially isolated from the atmosphere and is thus controlled by interplay between oxygen consumption processes, vertical and horizontal advection. Oxygen consumption rates can be both spatially and temporally dynamic, but these dynamics are often missed with incubation based techniques. Here we adopt a Bayesian approach to determining total BML oxygen consumption rates from a high resolution oxygen time-series. This incorporates both our knowledge and our uncertainty of the various processes which control the oxygen inventory. Total BML rates integrate both processes in the water column and at the sediment interface. These observations span the stratified period of the Celtic Sea and across both sandy and muddy sediment types. We show how horizontal advection, tidal forcing and vertical mixing together control the bottom mixed layer oxygen concentrations at various times over the stratified period. Our muddy-sand site shows cyclic spring-neap mediated changes in oxygen consumption driven by the frequent resuspension or ventilation of the seabed. We see evidence for prolonged periods of increased vertical mixing which provide the ventilation necessary to support the high rates of consumption observed.
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晚春凯尔特海浮游植物光合作用特征
DOI：
--
发表时间：
1993
期刊：
影响因子：
--
作者：
T. Platt;S. Sathyendranath;I. Joint;M. Fasham
通讯作者：
M. Fasham
影响因子：
4
作者：
V. Kitidis;K. Tait;Joana Nunes;I. Brown;E. Woodward;C. Harris;A. Sabadel;A. Sabadel;D. Sivyer;B. Silburn;S. Kröger
通讯作者：
V. Kitidis;K. Tait;Joana Nunes;I. Brown;E. Woodward;C. Harris;A. Sabadel;A. Sabadel;D. Sivyer;B. Silburn;S. Kröger
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
J. Sharples;J. Ellis;G. Nolan;B. Scott
通讯作者：
B. Scott
影响因子：
4.9
作者：
L. Rovelli;M. Dengler;M. Schmidt;S. Sommer;P. Linke;D. McGinnis
通讯作者：
L. Rovelli;M. Dengler;M. Schmidt;S. Sommer;P. Linke;D. McGinnis
DOI：
10.1017/s0025315400020919
发表时间：
1976-01-01
影响因子：
1.2
作者：
PINGREE, RD;HOLLIGAN, PM;HEAD, RN
通讯作者：
HEAD, RN