In Situ CO2 and O2 Measurements on a Profiling Float
In Situ CO2 and O2 Measurements on a Profiling Float
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DOI：
10.1175/jtech-d-12-00043.1
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发表时间：
2013-01-01
影响因子：
2.2
通讯作者：
Koertzinger, Arne
中科院分区：
文献类型：
--
作者：
Fiedler, Bjoern;Fietzek, Peer;Koertzinger, Arne
近年来，作为成功的国际阿尔戈观测站基础的剖面浮标，也被视为海洋生物地球化学研究的平台。这项研究展示了浮标作为一种用于联合测量二氧化碳分压（pCO₂）和氧气（O₂）的新型工具的实用性。这些浮标原型配备了小型可潜水的pCO₂传感器和光学氧气传感器，用于对海洋表层进行高分辨率测量。2010年11月至2011年6月期间，在北大西洋东部热带地区的佛得角海洋观测站（CVOO）附近进行了四次连续投放。剖面浮标每31小时进行一次上升测量，同时测量水柱上部200米内的pCO₂、O₂、盐度、温度和静水压力。为了保持准确性，对每个剖面都在深度和表面定期对pCO₂传感器进行归零操作，并在空气中进行光学测量。通过应用数据处理程序（例如，时间滞后校正），浮标携带的pCO₂测量精度得到了极大提高（水柱测量精度为10 - 15微大气压，表面测量精度为5微大气压）。O₂测量精度达到2微摩尔每千克。这项试点研究的初步结果表明，有可能将剖面浮标用作对海洋碳和氧循环动态进行详细且无人值守观测的平台。
In recent years, profiling floats, which form the basis of the successful international Argo observatory, are also being considered as platforms for marine biogeochemical research. This study showcases the utility of floats as a novel tool for combined gas measurements of CO2 partial pressure (pCO(2)) and O-2. These float prototypes were equipped with a small-sized and submersible pCO(2) sensor and an optode O-2 sensor for high-resolution measurements in the surface ocean layer. Four consecutive deployments were carried out during November 2010 and June 2011 near the Cape Verde Ocean Observatory (CVOO) in the eastern tropical North Atlantic. The profiling float performed upcasts every 31 h while measuring pCO(2), O-2, salinity, temperature, and hydrostatic pressure in the upper 200 m of the water column. To maintain accuracy, regular pCO(2) sensor zeroings at depth and surface, as well as optode measurements in air, were performed for each profile. Through the application of data processing procedures (e. g., time-lag correction), accuracies of floatborne pCO(2) measurements were greatly improved (10-15 mu atm for the water column and 5 mu atm for surface measurements). O-2 measurements yielded an accuracy of 2 mu mol kg(-1). First results of this pilot study show the possibility of using profiling floats as a platform for detailed and unattended observations of the marine carbon and oxygen cycle dynamics.