Collaborative Research: GEOTRACES Pacific Section - Nd isotopes and REEs in the South Pacific

钕同位素 (Nd) 和稀土元素 (REE) 被 GEOTRACES 计划认定为关键微量元素和同位素 (TEI)，因为它们可以追踪水团的来源和混合。因此，Nd 测量生成的传输数据将有可能增进我们对驱动海洋 TEI 分布的主要过程的理解。由于目前的观测结果与 GCM 模型不一致，因此南太平洋特别需要 Nd 测量。来自哥伦比亚大学和俄勒冈州立大学的研究人员将在即将进行的 2013 年 GEOTRACES 航行中分析海水、气溶胶、水柱颗粒和海底沉积物中的 Nd、锶和稀土元素。由于GEOTRACES太平洋航段的地理横断面，研究人员将评估一系列生物、化学和物理过程造成的影响，包括：边界交换、高生产力、气溶胶的表面添加、分离的肾层对底部水的添加、热液喷口的颗粒、可逆清除和地下水通量。此外，在秘鲁-智利最低氧气区 (OMZ) 内，研究人员将利用 TEI 铈来更好地了解横向和垂直过程的相对影响。通过增进对 TEI 分布的了解，研究结果还将增强生物地球化学模型并增进对气候系统的了解。 更广泛的影响：研究将促进两位年轻科学家的职业生涯，支持博士生的教育和培训。和本科生，并为外展活动提供材料。此外，结果将在科学期刊上发表，所有数据将提交给生物和化学海洋学数据管理办公室。

Neodymium isotopes (Nd) and rare earth elements (REE) are recognized by the GEOTRACES program as key trace elements and isotopes (TEIs) because they trace the sources and mixing of water masses. Therefore, transport data generated by Nd measurements will potentially advance our understanding on the dominant processes that drive TEI distribution in the ocean. There is a particular need for Nd measurements in the South Pacific because current observations do not agree with GCM models. Researchers from Columbia University and Oregon State University will analyze seawater, aerosols, water column particulates, and sea-floor sediments for Nd, strontrium, and REE during the upcoming 2013 GEOTRACES cruise. Because of the geographical transect of the GEOTRACES Pacific section cruise, investigators will assess impacts made by a suite of biological, chemical, and physical processes including: boundary exchange, high productivity, surface addition from aerosols, addition to bottom waters from detached nephloid layers, particles from hydrothermal vents, reversible scavenging, and groundwater fluxes. Furthermore, within the Peru-Chili Oxygen Minimum Zone (OMZ), investigators will utilize the TEI cerium to better understand relative effects of lateral and vertical processes. By improving understanding of the distribution of TEIs, results will also enhance biogeochemical models and advance knowledge of climate systems. Broader Impacts: Research will advance careers of two young scientists, support education and training of Ph.D. and undergraduate students, and provide materials for outreach activities. Additionally, results will be published in scientific journals and all data will be submitted to the Biological and Chemical Oceanography Data Management Office.