The Chemistry of Inorganic Chlorine in the Marine Boundary Layer at Bermuda During Spring

[9415559] Keene海洋边界层中无机氯的化学性质及其对氧化过程的影响是非常不确定的。间接证据表明，C1原子可能是世界海洋上重要的氧化剂。此外，最近的现场测量显示，MBL中除了HC1（可能是HOC1和/或C12）外，还有大量无机C1气体的浓度。C1原子前体被认为源自与海盐气溶胶（或极地地区的海冰）有关的反应，但对海盐脱氯的机制了解甚少。本研究将评估无机氯化学对MBL中臭氧、非甲烷烃（NMHCs）、硫和氮循环的影响。具体研究目标包括：1)同时测量MBL氯化学中涉及的主要反应物和产物种类及相关物理性质；2)测试海盐气溶胶脱氯的假设机制；3)评价C1原子和OH自由基在MBL中作为氧化剂的相对重要性；4)寻找C1原子反应生成的独特产物化合物；5)模拟无机C1化学及其对MBL氧化能力的贡献。在百慕大的大气/海洋化学实验（AEROCE）采样站，空气将在四周的时间内集中采样大约10个昼夜循环。将测量反应性微量气体（HC1*、C12*、HOC1*、NMHCs、有机卤化物、SO2、NHO3、NO、NOx、NOy、O3和CO）、大小分离气溶胶的化学成分（主要离子和微量元素）、各种示踪剂和对流层气象。

9415559 Keene The chemistry of inorganic chlorine and its influence on oxidation processes in the marine boundary layer (MBL) are very uncertain. Indirect evidence suggests that C1 atoms may be important oxidants over the world's oceans. In addition, recent field measurements reveal significant concentrations of inorganic C1 gases other than HC1 (probably HOC1 and/or C12) in the MBL. C1 atom precursors are thought to originate from reactions involving sea-salt aerosol (or possibly sea ice in polar regions), but mechanisms of sea-salt dechlorination are poorly understood. This study will assess the influence of inorganic chlorine chemistry on the cycling of ozone, non-methane hydrocarbons (NMHCs), sulfur, and nitrogen in the MBL. Specific research objectives include: 1) To measure simultaneously principal reactant and product species and related physical properties involved in MBL chlorine chemistry; 2) To test hypothesized mechanisms that dechlorinate sea-salt aerosol; 3) To assess the relative importance of C1 atoms and OH radicals as oxidants in the MBL; 4) To search for unique product compounds generated by C1 atom reactions; and 5) To model inorganic C1 chemistry and its contribution to oxidizing capacity in the MBL. Air will be intensively sampled during approximately 10 diel cycles over a 4-week period at the Atmosphere/Ocean Chemistry Experiment (AEROCE) sampling station on Bermuda. Reactive trace gases (HC1*, C12*, HOC1*, NMHCs, organic halides, SO2, NHO3, NO, NOx, NOy, O3, and CO), the chemical composition (major ions and trace elements) of size-segregated aerosol, a variety of tracers, and troposphere meteorology will be measured.