GEOTRACES Pacific Section: Measurement of CFCs and SF6

迈阿密大学罗森斯蒂尔海洋与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巡航期间进行高质量的氯氟烃（CFC）和六氟化硫（SF6）测量。这些测量将为巡航提供一个整体的海洋学背景，并通过表征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（TEIs）。此外，对于氧最小带（OMZ）的低氧水，研究者将区分由于物理循环过程而变老的水和由于生物化学过程而更新的低氧水。示踪剂年龄将有助于限制OMZ层的停留时间。其次，将上升流区域、OMZ和低硝酸盐区域的表观氧利用和反硝化等重要生化过程的速率与历史数据的估价值进行比较。最后，对tei所在的通风温跃层和中间水团进行识别，并估算其源区环流的有效时间尺度。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ADVANCE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，将支持和培训一名研究生。

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.