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年前往东热带南太平洋的GEOTRACES邮轮期间进行高质量的氯氟化碳(CFC)和六氟化硫(SF6)测量。这些测量将提供这次航行的总体海洋学背景，并通过描述可能影响其形态形成和内部循环的物理过程，有助于解释地球物理系统中的痕量元素及其同位素。此外，对于氧气最小区域(OMZ)中的低氧水域，研究人员将区分由于物理循环过程而陈旧的水与由于生化过程而新生的低氧水。示踪年龄将有助于限制OMZ层的停留时间。其次，上升区、OMZ和低硝酸盐地区的表观氧利用和反硝化等生物化学重要过程的速度将与历史数据的估计值进行比较。最后，将确定TEI所在的通风温跃层和中间水团，并估计它们从源头地区循环的有效时间尺度。在更广泛的影响方面，这位科学家将继续积极参与国家科学基金会高级计划，以及指导物理海洋学妇女增加保留(MPOWIR)计划。作为该项目的一部分，一名研究生将得到支持和培训。

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.