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

小行星9302150 氟氯化碳（CFC-11.在法国CONFLUENCE计划期间，将与图卢兹CNRS的Midi-Purenees天文台的Veronique Garcon博士和Universite P. -的克莉丝汀教务长合作，在南大西洋西部35.0 S和43.5 S之间测量海水中的CO2（总CO2浓度和pCO 2）。et-M。 居里，巴黎。 法国研究船Le Suroit已定于1993年12月至1994年1月进行考察，该船的时间和水文方案由法国国家科学研究中心资助。本研究的科学目标如下：1）以CFCs和最小位涡为示踪剂，利用模式沃茨研究南大西洋副热带环流温跃层沃茨的通风。 由于近地表沃茨在汇合区是高度不饱和的大气CO2，CO2的吸收和运输模式沃茨可以使用这些化学和物理示踪剂估计。 2)在中间深度，CFC最大值与AAIW的盐度最小值相关。 本研究将以氯氟烃为研究对象，探讨AAIW的循环路径与形成时间。3)1988-89年SAVE计划期间获得的数据表明，西部边界暗流，流向极地沿着阿根廷大陆斜坡在深度约2000米，表现出当地最低的CO2和CFC。 这些信号已经从10 S追踪到大约35 S。CFC和CO2信号的时空变化有助于理解NADW在南大西洋的传播过程。 4)在从南格鲁吉亚海盆进入阿根廷海盆的底层沃茨中检测到较高的氟氯化碳含量。这些氟氯化碳将在底层水中进行测量，以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.