In Situ Oxygen Sensor Calibration

“这项奖励是根据2009年美国复苏和再投资法案（公法111-5）资助的。”有机碳和有机氧的循环是由光合作用和呼吸作用的化学计量学联系在一起的，上层海洋中氧的质量平衡是确定海洋氧含量的重要示踪剂。生物碳泵？这种方法的实用性已经在海洋时间序列站点通过每月的船上氧气和惰性气体测量反复得到证明。最近有研究表明，利用原位传感器远程测量系泊处的氧气和总溶解气体压力，可以确定净生物产氧量。这种方法对精确的氧气测量非常敏感，目前只有在氧气传感器一年内可以校准几次才有可能实现，因为它们在光区的几个月后会因为生物污垢而漂移。唯一阻碍海洋学家利用现在和未来的公海表面系泊来获得全球年度净生物氧气产量的因素是氧气传感器的精度随时间的变化。π吗?美国申请资金，开发一种原位校准氧气传感器的方法，方法是定期将部署在海洋几米深的氧气传感器暴露在大气中。在校准期间，将测量温度和大气压力以及大气pO2。更广泛的影响这项工作将促进与Aanderaa科学家的国际合作，并可能促进在许多类型平台上这些传感器的数据处理和校准方法的改进。系泊数据集的价值将会增加，对海洋生物泵的了解也会增加。学生将接受化学海洋学领域的培训，该领域肯定需要未来的领导者。如果成功，系泊处就可以配备这种设计，从而可以估计海洋许多地方的碳排放。此外，如果这项技术可以应用于漂流者，可以大大提高全球范围内氧气测量的准确性。

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."The cycles of organic carbon and oxygen are linked by the stoichiometry of photosynthesis and respiration, the mass balance of oxygen in the upper ocean is an important tracer for determining the marine ?biological carbon pump?. The utility of this method has been demonstrated repeatedly at ocean time-series sites by monthly shipboard measurements of oxygen and inert gases. Recently it has been shown that it is possible to determine the net biological oxygen production using in situ sensors that measure oxygen and total dissolved gas pressure remotely on moorings. This approach is very sensitive to accurate O2 measurements that are presently possible only if oxygen sensors can be calibrated several times during the year, because they drift after several months in the euphotic zone because of biofouling. The only thing preventing oceanographers from using present and future open-ocean surface moorings to derive a global coverage of the net annual biological oxygen production is the change in accuracy of oxygen sensors over time. The PI?s request funding to develop a method of calibrating oxygen sensors in situ by periodically exposing the oxygen sensor deployed at several meters depth in the ocean to the atmosphere. Temperature and atmospheric pressure will be measured along with the atmospheric pO2 during the calibrations.Broader ImpactsThis work will foster international cooperation with Aanderaa scientists, and likely spur improvements in data processing and calibration approaches for these sensors on many types of platforms. The value of mooring data sets will be increased, and understanding gained on the marine biological pump. A student will be trained by in an area of chemical oceanography that is certain to need future leaders. If successful, moorings can be outfitted with the design, allowing carbon export to be estimated in many parts of the ocean. Further, if the technology can be applied to drifters, the accuracy of O2 measurements can be greatly increased worldwide.