RAPID: Continuation of US GEOTRACES North Atlantic Section: The fractional solubility of aerosol iron in seawater

2010年秋天，美国GEOTRACES北大西洋部分邮轮开始对一个盆地中痕量金属和同位素的分布进行调查，在那里大气沉积的影响更大。由于船(R/V KNORR)推进系统损坏，邮轮在早期阶段被暂停，当时邮轮航道只完成了不到三分之一。这一部分的完成已被重新安排在2011年秋季。有了这笔快速反应研究员补助金的支持，阿拉斯加大学费尔班克斯分校的一名GEOTRACES研究员将能够继续参与这项考察，以完成NSF最初提出并通过ARRA奖励资助的工作。这项工作涉及地球空间研究中心的指导使命：“确定控制海洋中关键微量元素和同位素分布的过程和通量，并确定这些分布对不断变化的环境条件的敏感性”。铁是GEOTRACES计划中的一种关键痕量元素，本研究使用一种新的现场方法研究了气溶胶铁的分数溶解度。这些结果将增进我们对气溶胶沉积如何影响北大西洋铁的表面分布的理解。从这项工作中获得的信息还将有助于确定不断变化的环境条件(例如，尘埃通量增加)如何影响铁的分布和形态。继续进行GEOTRACES北大西洋航段巡航将穿越具有显著不同化学和生物特征的表层水域，以及来自自然和人为来源的气溶胶沉积。巡航的这一部分提供了完成对影响北大西洋气溶胶铁溶解因素的调查所需的补充背景。更广泛的影响。将生成有关铁在海水中溶解的基本信息，并将其纳入GEOTRACES数据库。该项目提出了一种独特的方法来研究气溶胶铁在海水中的分数溶解度，这将为全球碳循环和气候变化模型提供重要信息，其中包括风沙铁的供应。该项目将支持阿拉斯加大学费尔班克斯分校(UAF)一名职业生涯早期的女性首席研究员，并帮助在UAF建设研究基础设施。UAF的一名本科生将从这项研究中获得支持。从这项研究中获得的信息将纳入网络传播和公众宣传活动的材料中。

In the fall of 2010, the US GEOTRACES North Atlantic Section cruise began its survey of the distribution of trace metals and isotopes across a basin where there is an enhanced influence from atmospheric deposition. Due to damages to the ship's (R/V Knorr) propulsion system, the cruise was halted at an early stage when less of a third of the cruise track was completed. The completion of this section has been rescheduled for the fall of 2011.With support through this Grant for Rapid Response Researcher, a GEOTRACES researcher at the University of Alaska at Fairbanks will be able to continue participation in this expedition to complete work originally proposed and funded by NSF through an ARRA award. This work addresses the guiding mission of GEOTRACES: "to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions". Iron is a key trace element in the GEOTRACES program, and this study investigates the fractional solubility of aerosol Fe using a novel field approach. Results will improve our understanding of how aerosol deposition affects the surface distribution of Fe in the North Atlantic. Information obtained from this work will also help establish how changing environmental conditions (e.g. increased dust flux) may affect the distribution and speciation of Fe.The continuation of the GEOTRACES North Atlantic section cruise will traverse over surface waters with significantly different chemical and biological characteristics, and with aerosol deposition from natural and anthropogenic sources. This portion of the cruise offers the complementary setting needed to complete the investigation of factors affecting aerosol Fe dissolution in the North Atlantic. Broader Impacts. Essential information concerning the dissolution of Fe in seawater will be generated and incorporated into the GEOTRACES database. This project presents a unique approach for investigating the fractional solubility of aerosol Fe in seawater that will result in important information for models of global carbon cycling and climate change that incorporate the aeolian supply of Fe. The project will support an early-career, female principal investigator at the University of Alaska Fairbanks (UAF), and helps build research infrastructure at UAF. An undergraduate student at UAF will receive support from this study. Information gained from this research will be incorporated into materials for web dissemination and public outreach events.