GEOTRACES Pacific Section: Measurement of CFCs and SF6

来自迈阿密大学罗森斯蒂尔海洋和大气科学学院的一名科学家将在2013年GEOTRACES前往东热带南太平洋的巡航中进行高质量的氯氟烃和六氟化硫测量。 这些测量将为航行提供总体海洋学背景，并通过描述可能影响其物种形成和内部循环的物理过程，有助于解释GEOTRACES微量元素及其同位素。 此外，对于氧气最小区（OMZ）中的低氧沃茨，研究人员将区分由于物理循环过程而老化的水和由于生物化学过程而新近更新的低氧沃茨。 示踪剂年龄将有助于限制OMZ层的停留时间。 其次，速率的生化重要的过程，如表观氧利用率和反硝化作用的上升流地区，OMZ，和低硝酸盐地区将与历史数据的估计进行比较。 最后，将确定TEI所在的通风温跃层和中间水团，并估计它们从源区开始的有效环流时间尺度。就更广泛的影响而言，科学家将继续积极参与美国国家科学基金会的ADVANCE计划，以及指导物理海洋学女性增加保留（MPOWIR）计划。 一名研究生将作为该项目的一部分得到支持和培训。

A scientist from the University of Miami, Rosenstiel School of Marine and Atmospheric Science, will make high quality chlorofluorocarbon (CFC) and sulfur hexafluoride (SF6) measurements during the 2013 GEOTRACES cruise to the Eastern Tropical South Pacific Ocean. These measurements will provide an overall oceanographic context for the cruise, as well as contribute to the interpretation of GEOTRACES trace elements and their isotopes (TEIs) by characterizing the physical processes which can affect their speciation and internal cycling. In addition, for the low oxygen waters in the oxygen minimum zone (OMZ), the researcher will distinguish water that is old as a result of physical circulation processes from recently renewed, yet low oxygen waters due to biochemical processes. Tracer ages will help constrain the residence times of the OMZ layers. Secondly, rates of biochemically important processes such as apparent oxygen utilization and denitrification in upwelling areas, the OMZ, and low nitrate regions will be compared with estimates from historical data. Lastly, ventilated thermocline and intermediate water masses within which TEIs reside will be identified and their effective time scales of circulation from the source regions will be estimated.In terms of the broader impacts, the scientist will continue her active participation in the National Science Foundation ADVANCE program, as well as the Mentoring Physical Oceanography Women to Increase Retention (MPOWIR) program. One graduate student will be supported and trained as part of this project.