Measurements of CFCs and CO2 during the French Confluence Expedition in the Western South Atlantic Ocean

9302150高桥氟氯化碳（CFC-11）。法国CONFLUENCE项目将在35.0S至43.5S期间在南大西洋西部的海水中测量二氧化碳（总二氧化碳浓度和二氧化碳分压），该项目将与图卢兹法国国家科学研究中心米迪-普雷内斯天文台的Veronique Garcon博士和p -et- m大学的Christine Provost博士合作。居里,巴黎。法国科考船Le Suroit已被安排于1993年12月至1994年1月进行考察，该船的时间和水文测量方案已由法国科学研究中心资助。本研究的科学目的是：1)以CFCs和最小位涡量为示踪剂，通过模式水体研究南大西洋亚热带环流温跃层水体的通气。由于汇流区的近地表水相对于大气CO2是高度不饱和的，因此可以使用这些化学和物理示踪剂估计模式水对CO2的吸收和输送。(2)在中等深度，CFC最大值与AAIW的盐度最小值相关。使用CFCs对AAIW的循环途径和形成时间进行了研究。(3) 1988- 1989年SAVE项目资料表明，沿阿根廷大陆坡向极地方向流动的西部边界潜流在约2000米深度处表现出局地CO2和CFC的最小值。这些信号被追踪到从10S到35S。CFC和CO2信号的时空变化将有助于了解NADW在南大西洋的传播过程。4)在从南乔治亚盆地进入阿根廷盆地的底部水域中检测到高CFC值。将在底水中测量这些氟氯化碳，以便了解其在阿根廷盆地的扩散途径。

9302150 TAKAHASHI CFCs (CFC-11., -12 and -113) and CO2 (total CO2 concentration and pCO2) will be measured in seawater during the French CONFLUENCE program in the western South Atlantic Ocean between 35.0S and 43.5S in collaboration with Dr. Veronique Garcon of Observatoir Midi- Purenees, CNRS, Toulouse, and Dr. Christine Provost of Universite P.-et-M. Curie, Paris. The French Research Vessel Le Suroit has been scheduled for the expedition, December 1993, through January 1994, and the ship's time and hydrographic program have been funded by CNRS. The Scientific objectives of the proposed study are as follows: 1) Investigate ventilation of the South Atlantic subtropical gyre thermocline waters by the mode waters using CFCs and minimum potential vorticity as tracers. Since near surface waters in the confluence zone are highly undersaturated with respect to atmospheric CO2, the CO2 uptake and transport by the mode waters can be estimated using these chemical and physical tracers. 2) In intermediate depths, a CFC maximum is associated with the salinity minimum of AAIW. The circulations pathway and time of formation of AAIW will be investigated using CFCs. 3) The data obtained during the 1988-89 SAVE program show that the western boundary undercurrent which flows poleward along the Argentine continental slopes at a depth of about 2000 meters exhibits a local minimum in CO2 and CFC. These signals have been traced from 10S to about 35S. Temporal and spatial changes in the CFC and CO2 signals will help to understand the spreading processes of NADW in the South Atlantic. 4) High CFC values have been detected in bottom waters entering into the Argentine Basin from the South Georgia Basin. These CFCs will be measured in the bottom water in order to learn its spreading pathway in the Argentine Basin.