Atmospheric Aeorsol Deposition Rates and Chemistry in Western Atlantic Trade Winds: The Link to Transport and Depostion Processes

摘要：各种物质从大陆向海洋的大气输送在海洋生物地球化学过程中起着重要作用，并可能影响全球碳循环。 然而，影响大气传输和沉积的大陆衍生的物种，如铁，氮，磷的因素知之甚少。 出于这个原因，罗森斯蒂尔海洋和大气科学学院的三位科学家提出了一项研究，旨在提高我们对控制非洲尘埃在热带大西洋沉积的过程的理解，从而提高对该地区尘埃沉积对海洋生物地球化学影响的估计。 为实现其目标，项目研究员将通过巴巴多斯信风中的干湿过程测量气溶胶沉积，并侧重于以下三个组成部分：（1）描述沉积速率、干湿沉积的相对重要性以及控制这些气溶胶沉积速率的过程;（2）气溶胶和降水中铁和其他与灰尘有关的微量元素的化学性质;（3）气溶胶和降水中氮磷形态的化学。 关于更广泛的影响，这项研究将对大气沉积对海洋环境中生物地球化学过程的影响产生新的认识。 作为该项目的一部分，将培训和支持三名研究生。

ABSTRACTOCE-0623189The atmospheric transport of various substances from the continents to the oceans plays an important role in marine biogeochemical processes and can impact the global carbon cycle. However, the factors affecting the atmospheric transport and deposition of continentally-derived species such as iron, nitrogen, and phosphorus are poorly known. For this reason, three scientists at Rosenstiel School of Marine and Atmospheric Sciences propose a study aimed at improving our understanding of the processes controlling the deposition of African dust over the tropical Atlantic, thereby improving estimates of the impact of dust deposition on the marine biogeochemistry in this region. To attain their goal, the PIs will measure aerosol deposition by wet and dry processes in the trade winds at Barbados and focus on the following three components: (1) characterizing the rates of deposition, the relative importance of wet and dry deposition, and the processes that control deposition rates of these aerosols; (2) the chemistry of iron and other dust-related trace elements in aerosols and precipitation; and (3) the chemistry of nitrogen and phosphorus species in aerosols and precipitation. As regards broader impacts, this study will yield new insights on the influence of atmospheric deposition on biogeochemical processes in the marine environment. Three graduate student will be trained and supported as part of this project.