Collaborative Research: Reactive Halogens in the Marine Boundary Layer (RHaMBLe) Overlying the Eastern Tropical North Atlantic Ocean

2007年5月至6月期间，研究所将参加对佛得角群岛卤素化学的表层海洋低层大气研究。 总体目标是表征热带北大西洋海洋边界层（MBL）中的活性卤素循环及其对氧化过程的影响。 这一部分的目的是：1）测量和/或计算MBL中重要无机卤素物质的昼夜变化; 2）量化挥发性和颗粒卤素的来源强度和周转率; 3）评估矿物气溶胶对卤素循环的潜在影响; 4）评估卤素对臭氧、碳氢化合物和硫的影响。 作为本项目的一部分，将测量盐酸（HCl）、除HCl以外的无机氯气、硝酸（HNO 3）、氨（NH3）以及挥发性无机溴和碘。 将推断气溶胶pH值，并计算气体和气溶胶的干沉降通量。 这些结果将与卤素物种、碳氢化合物、其他痕量气体、气溶胶物理特性和光化通量数据的综合套件相结合。 观测结果将用于检验卤素化学的假设，并将纳入多相光化学模型。 这项研究将解决对流层卤素自由基化学的不确定性及其对臭氧和气溶胶的影响。 更广泛的影响还包括本科生和研究生的教育以及加强国际合作。

The PIs will participate in a Surface Ocean Lower Atmosphere Study (SOLAS) investigation of halogen chemistry in the Cape Verde Islands during May-June 2007. The overall goal is to characterize reactive halogen cycling in the tropical North Atlantic marine boundary layer (MBL) and its impact on oxidation processes. The aims of this component are: 1) Measure and/or calculate the diel variability of important inorganic halogen species in the MBL; 2) Quantify source strengths and turnover rates of volatile and particulate halogens; 3) Evaluate potential influences of mineral aerosol on halogen cycling; and 4) Assess the effects of halogens on ozone, hydrocarbons, and sulfur. Hydrochloric acid (HCl), inorganic chlorine gases other than HCl, nitric acid (HNO3), ammonia (NH3), and volatile inorganic bromine and iodine will be measured as part of this project. Aerosol pH will be inferred and dry-deposition fluxes of gases and aerosols will be calculated. The results will be integrated with a comprehensive suite of halogen species, hydrocarbons, other trace gases, aerosol physical properties, and actinic flux data. Observations will be applied to test hypotheses of halogen chemistry and will be included in multiphase photochemical models. This research will address uncertainties in tropospheric halogen radical chemistry and its influences on ozone and aerosols. Broader impacts also include education of undergraduate and graduate students and strengthening international collaborations.