IODINE - ITS POSSIBLE ROLE IN TROPOSPHERIC PHOTOCHEMISTRY
IODINE - ITS POSSIBLE ROLE IN TROPOSPHERIC PHOTOCHEMISTRY
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DOI：
10.1029/jc085ic12p07383
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发表时间：
1980-01-01
影响因子：
3.6
通讯作者：
DAVIS, DD
中科院分区：
文献类型：
--
作者：
CHAMEIDES, WL;DAVIS, DD
对碘及其氧化物的光化学的详细研究表明，碘物种在对流层光化学系统中可能起着重要的，但迄今为止被忽视的作用。在海洋对流层中经常观察到平均浓度为5-10 ppt（v/v）的甲基碘，它被光解，从而产生碘原子。与O3、HxOy和NOx的化学相互作用使I转化为其他无机化合物，如IO、HOI、IONO 2和I2。这些物种的生产和随后的回收回I可以导致对流层O3的催化去除，NO2/NO比的提高，HxOy自由基的破坏，和HO 2到OH的转化。最终，对流层无机碘（IX）被非均相过程去除。使用数值模式模拟对流层光化学的计算表明，碘可能对大气O3-NOx-HxOy系统产生强烈影响。这些影响的大小取决于几个不确定的速率常数的值和CH 3 I和其他有机和无机碘化合物的主要来源分布。
A detailed study of the photochemistry of iodine and its oxides indicates that iodine species may play an important, but heretofore ignored, role in the tropospheric photochemical system. Methyl iodide, often observed in the marine troposphere with an average concentration of 5–10 ppt (v/v), is photolyzed and thereby produces I atoms. Chemical interactions with O3, HxOy, and NOxcause I to be converted to other inorganic compounds such as IO, HOI, IONO2, and I2. The production of these species and their subsequent recycling back to I can lead to the catalytic removal of tropospheric O3, the enhancement of the NO2/NO ratio, the destruction of HxOyfree radicals, and the conversion of HO2to OH. Ultimately, tropospheric inorganic iodine (IX) is removed by heterogeneous processes. Calculations using a numerical model to simulate tropospheric photochemistry indicate that iodine may have a strong impact upon the atmospheric O3‐NOx‐HxOysystem. The magnitude of these effects is dependent upon the value of several uncertain rate constants and the primary source distributions of CH3I and other organic and inorganic iodine compounds.