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

在2007年5月至6月期间，主要利益攸关方将参加佛得角群岛表面海洋低层大气研究(SOLAS)对卤素化学的调查。总体目标是研究热带北大西洋海洋边界层中的活性卤素循环及其对氧化过程的影响。该部分的目的是：1)测量和/或计算MBL中重要无机卤素物种的日变化；2)量化挥发性和颗粒性卤素的源强度和周转率；3)评估矿物气溶胶对卤素循环的潜在影响；以及4)评估卤素对臭氧、碳氢化合物和硫的影响。作为该项目的一部分，将测量盐酸(HCl)、除HCl以外的无机氯气、硝酸(HNO3)、氨(NH3)以及挥发性无机溴和碘。将推断气溶胶的pH值，并计算气体和气溶胶的干沉积通量。结果将与一套全面的卤素物种、碳氢化合物、其他痕量气体、气溶胶物理性质和光化通量数据整合在一起。观测将被用于检验卤素化学的假说，并将被包括在多相光化学模型中。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.