Implications of iodine chemistry for daytime HO2 levels at Rishiri Island
Implications of iodine chemistry for daytime HO2 levels at Rishiri Island
复制标题
碘化学对利尻岛白天 HO2 水平的影响
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
H. Akimoto
中科院分区：
文献类型：
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作者：
Y. Kanaya;Y. Yokouchi;J. Matsumoto;K. Nakamura;Shungo Kato;H. Tanimoto;H. Furutani;K. Toyota;H. Akimoto
2000 年 6 月在利尻岛观测到的正午 HO2 混合比最大值约为 10 pptv，但光化学盒模型模拟对该位置的 HO2 的预测平均高出了 70%。仅当 NO 混合比低于 300 pptv 时，这种高估才显着，并且与 NO/NO2 比率的高估一致。我们检测到了几种有机碘，可能是从海藻中释放出来的，并提出了 IO 自由基的存在。 IO 可以通过形成 HOI 来降低 HO2 混合比，HOI 随后可能被气溶胶清除或通过光解作用损失，也可能直接将 NO 转化为 NO2。使用已知的碘化学进行模型计算可以用 12-25 pptv 的 IO 重现观察到的 HO2。尽管碘化学不太可能解释 HO2 的全部差异，但几个 pptv 的 IO 可以显着降低 HO2 混合比和 NO/NO2 比。
The observed midday maximum in the mixing ratio of HO2 at Rishiri Island in June 2000 was ∼10 pptv, but photochemical box model simulations overpredicted HO2 at this location by an average of 70%. This overestimation was significant only when the mixing ratio of NO was lower than 300 pptv, and was coincident with overprediction of the NO/NO2 ratio. We detected several organoiodines, presumably emitted from seaweeds, and propose the presence of the IO radical. IO could reduce HO2 mixing ratios via the formation of HOI that may subsequently be scavenged by aerosols or lost by photolysis and may also convert NO to NO2 directly. Model calculations with known iodine chemistry could reproduce the observed HO2 with 12–25 pptv of IO. Although iodine chemistry is unlikely to explain the entire discrepancy in HO2, several pptv of IO could significantly reduce HO2 mixing ratios and NO/NO2 ratios.