High Resolution pH Measurements Using a Lab-on-Chip Sensor in Surface Waters of Northwest European Shelf Seas.
High Resolution pH Measurements Using a Lab-on-Chip Sensor in Surface Waters of Northwest European Shelf Seas.
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DOI：
10.3390/s18082622
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发表时间：
2018-08-10
期刊：
影响因子：
--
通讯作者：
Mowlem MC
中科院分区：
文献类型：
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作者：
Rérolle VMC;Achterberg EP;Ribas-Ribas M;Kitidis V;Brown I;Bakker DCE;Lee GA;Mowlem MC
大气中二氧化碳浓度的增加导致海水pH值下降，对海洋生物有潜在的有害后果。在自然pH值变化的背景下，需要做出更大努力来监测人为驱动的pH值下降。本文介绍了2011年夏季在西北欧大陆架海域获得的高分辨率表层水pH数据集。本文的目的是证明pH传感器的成功应用，并利用pH和辅助数据讨论西北欧大陆架表层水的碳酸盐化学动力学。酸碱值的测量是用分光光度法进行的，将一个芯片上实验室的酸碱度传感器连接到船舶的在航海水供应上。用统计方法确定了控制船舶横断面pH值分布的主要过程及其相对重要性。该pH传感器允许10次测量−1，精确度为0.001个pH单位，与由一对离散采样的碳酸盐变量计算的pH值吻合较好。对于这次夏季游轮，生物活动对游轮样带的pH分布构成了主要的控制。这项研究强调了高质量和高分辨率的pH测量对于评估海水中碳酸盐化学动力学的重要性。
Increasing atmospheric CO2 concentrations are resulting in a reduction in seawater pH, with potential detrimental consequences for marine organisms. Improved efforts are required to monitor the anthropogenically driven pH decrease in the context of natural pH variations. We present here a high resolution surface water pH data set obtained in summer 2011 in North West European Shelf Seas. The aim of our paper is to demonstrate the successful deployment of the pH sensor, and discuss the carbonate chemistry dynamics of surface waters of Northwest European Shelf Seas using pH and ancillary data. The pH measurements were undertaken using spectrophotometry with a Lab-on-Chip pH sensor connected to the underway seawater supply of the ship. The main processes controlling the pH distribution along the ship’s transect, and their relative importance, were determined using a statistical approach. The pH sensor allowed 10 measurements h−1 with a precision of 0.001 pH units and a good agreement with pH calculated from a pair of discretely sampled carbonate variables dissolved inorganic carbon (DIC), total alkalinity (TA) and partial pressure of CO2 (pCO2) (e.g., pHDICpCO2). For this summer cruise, the biological activity formed the main control on the pH distribution along the cruise transect. This study highlights the importance of high quality and high resolution pH measurements for the assessment of carbonate chemistry dynamics in marine waters.