Nitrate drawdown during a shelf sea spring bloom revealed using a novel microfluidic in situ chemical sensor deployed within an autonomous underwater glider
Nitrate drawdown during a shelf sea spring bloom revealed using a novel microfluidic in situ chemical sensor deployed within an autonomous underwater glider
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DOI：
10.1016/j.marchem.2018.07.005
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发表时间：
2018-09-20
期刊：
影响因子：
3
通讯作者：
Lohan, Maeve C.
中科院分区：
文献类型：
--
作者：
Vincent, Alexander G.;Pascal, Robin W.;Lohan, Maeve C.
在这里，我们描述，第一次，使用一个小型化的芯片实验室（LoC）营养传感器部署在一个自主的水下航行器（AUV;孔斯贝格Seaglider）收集高分辨率的硝酸盐（硝酸盐+亚硝酸盐）的数据在一个高度动态的陆架海环境。季节性分层的温带陆架海是重要的碳汇，其初级生产受硝酸盐等营养物质的供应控制。春季浮游植物水华和零星的混合事件可以大大改变硝酸盐的时间尺度上从小时到天的可用性。传统的采样方法无法捕获高频事件，而使用部署在滑翔机内的湿化学微流体系统可以清楚地观察到这些事件。我们首先强调，LoC和船上硝酸盐+亚硝酸盐测量之间的良好一致性（r（2）= 0.98 n = 11）。其次，在春季水华开始期间，LoC能够观察到表面混合层内的硝酸盐从5.74 μ M（第4次）减少到1.42 μ M（第25次），而底层浓度保持不变（6.86 +/-0.16 μ M），估计分析不确定性<0.2 μ M。第三，部署在AUV内的LoC传感器能够在空间和时间尺度上以更高的分辨率准确捕获同时的地球化学和物理参数，提高了我们对动态温带陆架海洋环境中地球化学循环的理解。
Here we describe, for the first time, the use of a miniaturized Lab-on-Chip (LoC) nutrient sensor deployed within an autonomous underwater vehicle (AUV; Kongsberg Seaglider) to collect high-resolution nitrate (nitrate + nitrite) data in a highly dynamic shelf sea environment. Seasonally stratified temperate shelf seas act as important carbon sinks, where primary production is controlled by the availability of nutrients such as nitrate. Spring phytoplankton blooms and sporadic mixing events can drastically modify the availability of nitrate on temporal scales from hours to days. Traditional sampling methods are unable to capture high frequency events that can be clearly observed using a wet-chemical microfluidic system deployed within a glider. We highlight firstly, an excellent agreement between the LoC and shipboard nitrate + nitrite measurements (r(2) = 0.98 n = 11). Secondly, the LoC was able to observe a decrease in nitrate within the surface mixed layer from 5.74 mu M (4th) to 1.42 mu M (25th) during the onset of the spring bloom, whilst bottom layer concentrations remained constant (6.86 +/- 0.16 mu M), with an estimated analytical uncertaintly of < 0.2 mu M. Thirdly, the ability of an LoC sensor deployed within an AUV to accurately capture simultaneous biogeochemical and physical parameters at an enhanced resolution, on both spatial and temporal scales, improves our understanding of biogeochemical cycles within the dynamic temperate shelf sea environments.