Modelling molecular iodine emissions in a coastal marine environment: The link to new particle formation
Modelling molecular iodine emissions in a coastal marine environment: The link to new particle formation
复制标题
模拟沿海海洋环境中的分子碘排放：与新颗粒形成的联系
DOI：
10.5194/acp-6-883-2006
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发表时间：
2005
影响因子：
6.3
通讯作者：
T. Hoffmann
中科院分区：
文献类型：
--
作者：
A. Saiz‐Lopez;J. Plane;G. Mcfiggans;P. Williams;S. M. Ball;M. Bitter;Roderic L. Jones;C. Hongwei;T. Hoffmann
利用海洋边界层（MBL）碘化学模式研究了沿海地区白天分子碘（I2）排放的影响。该模型包含一个完整的处理气相碘化学，结合描述的成核和生长，通过冷凝和凝聚，氧化碘纳米粒子。现场测量的沿海排放的I 2的宽带腔衰荡光谱（BBCRDS）和电感耦合等离子体质谱（ICP/MS）技术，并比较长路径差分光学吸收光谱（DOAS）观测的I 2在梅斯黑德，爱尔兰。同时测量增强的I 2排放和粒子爆发表明，I 2几乎肯定是在这个沿海位置的新粒子的主要前体。模型预测的IO与I2的比值表明，DOAS观测到的碘物种集中在与潮间带一致的短距离（约4.2 km光路的8%）内，这使它们与两种原位技术测量的I2值吻合得很好。然后，该模式被用来研究碘排放对臭氧消耗的影响，以及新粒子的产生和演变形成稳定的云凝结核（CCN）。
A model of iodine chemistry in the marine boundary layer (MBL) has been used to investigate the impact of daytime coastal emissions of molecular iodine (I 2 ). The model contains a full treatment of gas-phase iodine chemistry, combined with a description of the nucleation and growth, by condensation and coagulation, of iodine oxide nano-particles. In-situ measurements of coastal emissions of I 2 made by the broadband cavity ring-down spectroscopy (BBCRDS) and inductively coupled plasma-mass spectrometry (ICP/MS) techniques are presented and compared to long path differential optical absorption spectroscopy (DOAS) observations of I 2 at Mace Head, Ireland. Simultaneous measurements of enhanced I 2 emissions and particle bursts show that I 2 is almost certainly the main precursor of new particles at this coastal location. The ratio of IO to I 2 predicted by the model indicates that the iodine species observed by the DOAS are concentrated over a short distance (about 8% of the 4.2 km light path) consistent with the intertidal zone, bringing them into good agreement with the I 2 measurements made by the two in-situ techniques. The model is then used to investigate the effect of iodine emission on ozone depletion, and the production of new particles and their evolution to form stable cloud condensation nuclei (CCN).