Atmospheric Transport and Photo-chemical Transformation of Iron: Model Development, Application, and Verification with Surface and Satellite Data

铁的大气传输和光化学转化：模型开发、应用以及地面和卫星数据的验证

• 批准号: 0826117
• 负责人: Nicholas Meskhidze
• 金额: $ 28.73万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0826117&HistoricalAwards=false
• 关键词: Atmospheric; Transport; Photo; chemical; Transformation

In this project, a coupled chemistry-aerosol-cloud-radiation model for the production of water-soluble iron (DFe) in ambient particles will be developed and applied to the transport and deposition of DFe to different parts of the global oceans. The main hypothesis is that atmospheric transport and transformation of mineral aerosols play an important role in mobilizing Fe from highly insoluble mineral phases to water-soluble forms that are available for biological uptake by phytoplankton. The objectives of this study are to reduce uncertainties in assessments of DFe fluxes to the oceans associated with the mineralogical composition of dust, crustal and combustion sources of Fe, photochemical reductive dissolution of Fe oxides, cloud processing of aerosols, chemical cycling of Fe, and model grid resolution. The GEOS-Chem (Goddard Earth Observing System-Chemistry) model will be used with a recently implemented dust iron mobilization mechanism. The model will be used to provide (1) coarse grid simulations to estimate average fluxes of DFe to different parts of the global ocean; (2) nested grid simulations to characterize regional features of Fe dissolution and deposition of DFe in coastal regions; (3) sensitivity studies of dust mineralogical composition and dissolution mechanisms; and (4) an assessment of capabilities in modeling mineral aerosols.This study will lead to an improved understanding of processes responsible for the production of DFe in ambient particles and will facilitate the assessment of the role of dust in ocean productivity and the carbon cycle. This research will support the education of a diverse group of undergraduate and graduate students in atmospheric science. Outreach projects organized by the Science House of North Carolina State University will be carried out with a goal of increasing student enthusiasm for science by partnering with K-12 teachers to promote hands-on inquiry-based science learning.

在该项目中，将开发一个化学-气溶胶-云-辐射耦合模型，用于在环境颗粒中生产水溶性铁（DFe），并将其应用于DFe向全球海洋不同部分的传输和沉积。 主要假设是，大气输送和矿物气溶胶的转化在将铁从高度不溶性矿物相转移到可供浮游植物生物吸收的水溶性形式方面发挥着重要作用。 本研究的目的是减少与灰尘矿物成分、铁的地壳和燃烧源、铁氧化物的光化学还原溶解、气溶胶的云处理、铁的化学循环和模型网格分辨率。 GEOS-Chem（戈达德地球观测系统-化学）模型将与最近实施的铁尘动员机制一起使用。 该模型将用于提供（1）粗网格模拟，以估计全球海洋不同部分的 DFe 平均通量； (2) 嵌套网格模拟，表征沿海地区 Fe 溶解和 DFe 沉积的区域特征； （3）粉尘矿物成分和溶解机制的敏感性研究； (4) 对矿物气溶胶建模能力的评估。这项研究将有助于更好地了解环境颗粒中 DFe 的产生过程，并将有助于评估灰尘在海洋生产力和碳循环中的作用。 这项研究将支持大气科学领域多元化本科生和研究生的教育。 北卡罗来纳州立大学科学之家组织的外展项目将与 K-12 教师合作，促进基于实践探究的科学学习，提高学生对科学的热情。