Iodine monoxide at a clean marine coastal site: observations of high frequency variations and inhomogeneous distributions
Iodine monoxide at a clean marine coastal site: observations of high frequency variations and inhomogeneous distributions
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DOI：
10.5194/acp-11-6721-2011
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发表时间：
2011-01-01
影响因子：
6.3
通讯作者：
Heard, D. E.
中科院分区：
文献类型：
--
作者：
Commane, R.;Seitz, K.;Heard, D. E.
2007年8月，在爱尔兰的梅斯黑德，使用激光诱导荧光仪器对一氧化碘（IO）进行了首次现场观测。IO混合比高达49.8 pptv（相当于pmol mol（-1）; 1秒平均），观察到在白天低潮，远远超过以前观察到的空间平均最大值。IO混合比与潮高的强反相关性是显而易见的，观测的高时间分辨率显示IO在低潮后的一小时内达到峰值。与低潮相比，IO峰值的时间延迟以前没有观察到，但与以前在Mace Head观察到的气溶胶数量峰值的时间相吻合。在点测量观测期间，长路径差分光学吸收光谱仪（具有穿过Roundstone Bay的2 x 6.8 km折叠路径）也在现场进行了3天的观测。这两种仪器显示出类似的时间趋势，但IO的点测量是一个因素，类似的6-10倍大于空间平均IO混合比，提供直接的经验证据的存在下的不均匀性的IO混合比附近的潮间带区域。
The first in situ point observations of iodine monoxide (IO) at a clean marine site were made using a laser-induced fluorescence instrument deployed at Mace Head, Ireland in August 2007. IO mixing ratios of up to 49.8 pptv (equivalent to pmol mol(-1); 1 s average) were observed at day-time low tide, well in excess of previous observed spatially-averaged maxima. A strong anti-correlation of IO mixing ratios with tide height was evident and the high time resolution of the observations showed IO peaked in the hour after low tide. The temporal delay in peak IO compared to low tide has not been observed previously but coincides with the time of peak aerosol number previously observed at Mace Head.A long path-differential optical absorption spectroscopy instrument (with a 2 x 6.8 km folded path across Roundstone Bay) was also based at the site for 3 days during the point measurement observation period. Both instruments show similar temporal trends but the point measurements of IO are a factor of similar to 6-10 times greater than the spatially averaged IO mixing ratios, providing direct empirical evidence of the presence of inhomogeneities in the IO mixing ratio near the intertidal region.