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

在这个项目中，将开发一个化学-气溶胶-云-辐射耦合模型，用于在环境颗粒中产生水溶性铁（DFe），并将其应用于DFe向全球海洋不同部分的传输和沉积。 主要的假设是，大气中的矿物气溶胶的运输和转化在动员铁从高度不溶性矿物相的水溶性形式，可用于生物吸收浮游植物中发挥了重要作用。 本研究的目的是减少DFe通量与尘埃，地壳和燃烧源的Fe，铁氧化物的光化学还原溶解，云处理的气溶胶，化学循环的Fe，和模型网格分辨率的矿物组成的海洋评估的不确定性。 GEOS-Chem（戈达德地球观测系统-化学）模型将与最近实施的尘埃铁动员机制一起使用。 该模式将用于：（1）粗网格模拟，以估计DFe到全球海洋不同部分的平均通量;（2）嵌套网格模拟，以表征沿海地区Fe溶解和DFe沉积的区域特征;（3）尘埃矿物组成和溶解机制的敏感性研究;以及（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产生DFe的过程，并将有助于评估尘埃在海洋生产力和海洋环境中的作用。碳循环 这项研究将支持在大气科学的本科生和研究生的多样化群体的教育。 由北卡罗来纳州州立大学科学之家组织的外展项目将与K-12教师合作，促进实践探究式科学学习，以提高学生对科学的热情。

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.