Measurements of iodine monoxide at a semi polluted coastal location
Measurements of iodine monoxide at a semi polluted coastal location
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DOI：
10.5194/acp-10-3645-2010
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发表时间：
2009-12
影响因子：
6.3
通讯作者：
K. Furneaux;L. Whalley;D. Heard;H. Atkinson;W. Bloss;M. Flynn;M. Gallagher;T. Ingham;L. Kramer;James D. Lee;R. Leigh;G. Mcfiggans;A. Mahajan;P. Monks;H. Oetjen;J. Plane;J. Whitehead
中科院分区：
文献类型：
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作者：
K. Furneaux;L. Whalley;D. Heard;H. Atkinson;W. Bloss;M. Flynn;M. Gallagher;T. Ingham;L. Kramer;James D. Lee;R. Leigh;G. Mcfiggans;A. Mahajan;P. Monks;H. Oetjen;J. Plane;J. Whitehead
抽象。点源测量的IO激光诱导荧光光谱法在半污染的沿海位置在海洋边界层（RHaMBLe）活动在2006年9月。该地点位于Roscoff的法国西北海岸，其特征是在低潮时暴露的广泛的潮间带大型藻类床。最近的已知碘活性大型藻类床距离测量点至少300米。从20天的测量，IO被观察到高于仪器的检测限的14天，其中一个明确的昼夜分布观察到的11天。最大的IO混合比是30.0 pptv（10秒积分期）在白天，在大气中观测到的最高浓度，和1-2 pptv在夜间。IO浓度强烈依赖于潮高，太阳辐射强度和气象条件。使用点源和空间平均DOAS仪器的IO测量的相互比较证实了由大型藻类的不均匀分布引起的IO热点的存在。IO和超细颗粒（2.5 nm≥d≥10 nm）的同时点源测量显示出很强的相关性，提供了IO参与沿海地区超细颗粒产生途径的证据。最后，模拟研究表明，高IO浓度，这是可能产生的macrolagae丰富的环境中可以显着扰动的OH和HO 2自由基的浓度。随着NOx浓度的增加，IO对HOx的影响减小。
Abstract. Point source measurements of IO by laser induced fluorescence spectroscopy were made at a semi-polluted coastal location during the Reactive Halogens in the Marine Boundary Layer (RHaMBLe) campaign in September 2006. The site, on the NW French coast in Roscoff, was characterised by extensive intertidal macroalgae beds which were exposed at low tide. The closest known iodine active macroalgae beds were at least 300 m from the measurement point. From 20 days of measurements, IO was observed above the instrument limit of detection on 14 days, of which a clear diurnal profile was observed on 11 days. The maximum IO mixing ratio was 30.0 pptv (10 s integration period) during the day, amongst the highest concentrations ever observed in the atmosphere, and 1–2 pptv during the night. IO concentrations were strongly dependent on tidal height, the intensity of solar irradiation and meteorological conditions. An intercomparison of IO measurements made using point source and spatially averaged DOAS instruments confirms the presence of hot-spots of IO caused by an inhomogeneous distribution of macroalgae. The co-incident, point source measurement of IO and ultra fine particles (2.5 nm≥d≥10 nm) displayed a strong correlation, providing evidence that IO is involved in the production pathway of ultra fine particles at coastal locations. Finally, a modelling study shows that high IO concentrations which are likely to be produced in a macrolagae rich environment can significantly perturb the concentrations of OH and HO2 radicals. The effect of IO on HOx is reduced as NOx concentrations increase.