pH, Oxygen and Nitrate Chemical Sensors for Southern Ocean Floats

适用于南大洋浮标的 pH、氧气和硝酸盐化学传感器

• 批准号: 1353177
• 负责人: Kenneth Johnson
• 金额: $ 13.54万
• 依托单位: Monterey Bay Aquarium Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1353177&HistoricalAwards=false
• 关键词: pH; Oxygen; Nitrate; Chemical; Sensors

The proposal 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 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.

该提案将建立和验证一套6个pH和硝酸盐传感器，用于将部署在南大洋的剖面浮标。这些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，浮标还将携带荧光光电氧传感器以及叶绿素荧光和反向散射的生物光学传感器。每个浮体将在1700 m深度至水面的约330个剖面上运行。这应相当于在接近7天的剖面间隔下的5年耐久性。剖面浮标将沿着十年一次的CLIVAR P16 S巡航部署，该巡航计划于2014年3月离开新西兰。P16 S线将从冰缘沿沿着150度W向北延伸。其中三个装有化学传感器的浮标将部署在有季节性冰层覆盖的纬度地区，三个将部署在冰层覆盖的海洋北部，浮标收集的pH值数据将成为一个地区pH值年度循环的首批记录之一，该地区预计随着大气CO2的持续增加，文石将变得不饱和。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。