Profiling Floats with Chemical Sensors for the Southern Ocean

该项目将建立并验证一套6个pH和硝酸盐传感器，用于分析将部署在南大洋的浮标。这些来自MBARI的传感器将与华盛顿大学浮子实验室提供的浮子集成。除了pH值和氧气传感器外，浮子还将携带荧光光电氧传感器以及叶绿素荧光和后向散射生物光学传感器。每个浮子将从1700米的深度到水面运行大约330个剖面。这应该相当于5年的续航时间，在分析间隔接近7天。分析浮标将部署在CLIVAR P16S巡航上，该巡航计划于2014年3月离开新西兰。P16S探测线将沿着西经150度的冰面向北移动，其中三个装有化学传感器的浮标将被部署在季节性冰层覆盖的纬度地区，另外三个将被部署在冰层覆盖的海洋北部。浮子收集的pH值数据应该是该地区pH值年循环的首批记录之一。随着大气中二氧化碳的持续增加，该地区文石的饱和度预计将变得不足。这将允许对当前一代气候模型预测海洋pH值轨迹的能力进行独特的评估。

The project will build and validate a set of 6 pH and nitrate sensors for profiling floats that will be deployed in the Southern Ocean. These sensors, from MBARI, will be integrated with floats supplied by the University of Washington Float lab. In addition to the pH and oxygen sensors, the floats will also carry fluorescence optode oxygen sensors together with biooptical sensors for chlorophyll fluorescence and backscatter. Each float will operate for approximately 330 profiles from 1700 m depth to the surface. This should equate to a 5 year endurance at profiling intervals near 7 days. The profiling floats will be deployed along the decadal CLIVAR P16S cruise, scheduled to leave New Zealand in March 2014. The P16S line will go north from the ice edge along 150 degrees W. Three of the floats with chemical sensors will be deployed at latitudes where there should be seasonal ice cover and three will be deployed to the north of the ice covered ocean.The pH data collected by the floats should provide one of the first records of the annual cycle of pH in a region that is expected to become undersaturated with aragonite as atmospheric CO2 continues to increase. This will allow a unique assessment of the ability of current generation climate models to predict ocean pH trajectories.