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

RAPID：美国 GEOTRACES 北大西洋部分的延续：海水中气溶胶铁的溶解度分数

• 批准号: 1137836
• 负责人: Ana Aguilar-Islas
• 金额: $ 1.5万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1137836&HistoricalAwards=false
• 关键词: RAPID; Continuation; US; GEOTRACES; North

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.

2010年秋天，美国GEOTRACES北大西洋航段开始对受大气沉积影响增强的盆地内痕量金属和同位素的分布进行调查。由于该船（R/V Knorr）推进系统损坏，巡航提前停止，当时巡航轨迹还不到三分之一。该部分的完成时间已重新安排在 2011 年秋季。在快速响应研究员拨款的支持下，阿拉斯加大学费尔班克斯分校的 GEOTRACES 研究员将能够继续参与本次探险，以完成最初由 NSF 通过 ARRA 奖项提议和资助的工作。这项工作解决了 GEOTRACES 的指导使命：“识别控制海洋中关键微量元素和同位素分布的过程和量化通量，并确定这些分布对不断变化的环境条件的敏感性”。铁是 GEOTRACES 计划中的关键微量元素，本研究使用一种新颖的现场方法研究了气溶胶铁的溶解度分数。结果将提高我们对气溶胶沉积如何影响北大西洋铁表面分布的理解。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。GEOTRACES北大西洋航段的继续航行将穿越化学和生物特征显着不同的地表水域，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的因素的调查所需的补充环境。更广泛的影响。 将生成有关海水中铁溶解的基本信息，并将其纳入 GEOTRACES 数据库中。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溶解度分数，这将为包含铁的风供应的全球碳循环和气候变化模型提供重要信息。该项目将为阿拉斯加大学费尔班克斯分校 (UAF) 的一名职业生涯早期女性首席研究员提供支持，并帮助 UAF 建设研究基础设施。 UAF 的一名本科生将获得这项研究的支持。从这项研究中获得的信息将被纳入网络传播和公共宣传活动的材料中。