Collaborative Proposal: GEOTRACES Pacific Section: Collection and analysis of atmospheric deposition

合作提案：GEOTRACES 太平洋部分：大气沉降的收集和分析

• 批准号: 1454368
• 负责人: Clifton Buck
• 金额: $ 11.8万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-05-30 至 2016-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1454368&HistoricalAwards=false
• 关键词: Collaborative; Proposal; GEOTRACES; Pacific; Section

During the 2013 GEOTRACES Eastern Pacific zonal transect, a gradient in aerosol inputs to surface waters will be encountered with higher inputs near Peru and decreasing offshore. This zonal section contrasts sharply to the high aerosol deposition areas found and sampled during the GEOTRACES North Atlantic Zonal Section in the fall of 2010 and 2011. As such, this Pacific section represents a unique opportunity to characterize aerosol and rainfall chemistry in a low deposition environment. Scientists from the University of Alaska and Florida State University plan to collect and characterize aerosol and rainfall samples along this transect, as well as distribute samples to the community. Bulk and size-fractionated aerosol samples collected on a 24 to 48-hour integrated basis and event-based rain samples will be analyzed for trace elements and isotopes (TEIs) to quantify their atmospheric input. The TEIs to be analyzed will be aluminum, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, cadmium, lead, and thorium, as well as the major ions sodium, magnesium, potassium, calcium, nitrate, phosphate, chlorine, and fluorine. Other efforts to be carried out as part of this study include (1) aerosol leaches to determine seawater-soluble and ultrapure-water-soluble TEI fractions: (2) determine the size fractionation and redox speciation of seawater-soluble iron: (3) obtain subsamples of water column samples from other GEOTRACES scientists for the analysis of the TEIs of interest to help interpret the atmospheric deposition data; and (4) collaborate with researchers from other institutions to characterize and constrain estimates of atmospheric deposition. This project will contribute towards the overall goal of the GEOTRACES Program by establishing the range of fractional aerosol solubility and better quantify deposition across the global ocean. One graduate student from the University of Alaska would be supported and trained as part of this project. Relying on a cruise blog, email, and project website updates, the scientist from the University of Alaska plans to continue her interactions with students in Alaska, Arizona, and Florida and results from the study would be incorporated into class curricula, as well as disseminated via public outreach and web dissemination.

在 2013 年 GEOTRACES 东太平洋纬向横断面期间，地表水气溶胶输入将出现梯度，秘鲁附近输入较高，近海输入减少。该区域剖面与 2010 年和 2011 年秋季 GEOTRACES 北大西洋区域剖面中发现和采样的高气溶胶沉积区域形成鲜明对比。因此，该太平洋剖面代表了在低沉积环境中表征气溶胶和降雨化学特征的独特机会。 阿拉斯加大学和佛罗里达州立大学的科学家计划沿该横断面收集和表征气溶胶和降雨样本，并将样本分发给社区。 将分析 24 至 48 小时综合收集的大量和粒度分级气溶胶样本以及基于事件的降雨样本的微量元素和同位素 (TEI)，以量化其大气输入。 要分析的 TEI 包括铝、钒、铬、锰、铁、钴、镍、铜、锌、镉、铅和钍，以及主要离子钠、镁、钾、钙、硝酸盐、磷酸盐、氯和氟。 作为本研究的一部分，将进行的其他工作包括 (1) 气溶胶浸出以确定海水可溶性和超纯水溶性 TEI 组分：(2) 确定海水可溶性铁的尺寸分级和氧化还原形态：(3)从其他 GEOTRACES 科学家处获取水柱样本的子样本，用于分析感兴趣的 TEI，以帮助解释大气沉降数据； (4) 与其他机构的研究人员合作，描述和限制大气沉降的估计。该项目将通过确定气溶胶溶解度分数范围并更好地量化全球海洋的沉积量，为 GEOTRACES 计划的总体目标做出贡献。作为该项目的一部分，阿拉斯加大学的一名研究生将得到支持和培训。 依靠邮轮博客、电子邮件和项目网站更新，这位来自阿拉斯加大学的科学家计划继续与阿拉斯加、亚利桑那州和佛罗里达州的学生互动，研究结果将纳入课堂课程，并进行传播通过公共宣传和网络传播。