A modelling study of the atmospheric chemistry of DMS using the global model, STOCHEM-CRI
A modelling study of the atmospheric chemistry of DMS using the global model, STOCHEM-CRI
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DOI：
10.1016/j.atmosenv.2015.12.028
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发表时间：
2016-02-01
影响因子：
5
通讯作者：
Shallcross, D. E.
中科院分区：
文献类型：
--
作者：
Khan, M. A. H.;Gillespie, S. M. P.;Shallcross, D. E.
使用全局三维化学输运模型 STOCHEM 和 CRIv2-R5 化学方案研究二甲硫醚 (DMS) 的对流层化学。对 DMS 的对流层分布及其通过 OH 提取、OH 添加、NO3 氧化和 BrO 氧化在表面的去除进行了建模。研究表明，DMS 的寿命和全球负担约为。分别为 1.2 天和 98 Gg S。加入 BrO 氧化会导致 DMS 的寿命（1.0 天）和总体负担（83 Gg S）减少，表明该反应在 DMS 预算中很重要。 BrO 氧化对 DMS 总去除量的贡献百分比仅为 7.9%，这被认为是下限，因为该研究不包括来自海盐的无机溴源。 BrO 氧化在南半球 (SH) 高纬度地区贡献显着。通过 Cl-2 去除 DMS 的结果表明，根据来自南大洋的 Cl-2 通量，可能会通过这种反应去除大量 DMS，特别是在偏远的南海海洋中。模型 DMS 水平根据来自全球六个不同地点的测量数据进行评估。该模型预测了所有地点 DMS 的正确季节周期，并与大多数时期的测量数据良好相关。 (C) 2015 Elsevier Ltd. 保留所有权利。
The tropospheric chemistry of dimethylsulfide (DMS) is investigated using a global three-dimensional chemical transport model, STOCHEM with the CRIv2-R5 chemistry scheme. The tropospheric distribution of DMS and its removal at the surface by OH abstraction, OH addition, NO3 oxidation, and BrO oxidation is modelled. The study shows that the lifetime and global burden of DMS is ca. 1.2 days and 98 Gg S, respectively. Inclusion of BrO oxidation resulted in a reduction of the lifetime (1.0 day) and global burden (83 Gg S) of DMS showing that this reaction is important in the DMS budget. The percentage contribution of BrO oxidation to the total removal of DMS is found to be only 7.9% that is considered a lower limit because the study does not include an inorganic source of bromine from sea salt. BrO oxidation contributed significantly in the high latitudes of the southern hemisphere (SH). Inclusion of DMS removal by Cl-2 showed that potentially a large amount of DMS is removed via this reaction specifically in the remote SH oceans, depending on the flux of Cl-2 from the Southern Ocean. Model DMS levels are evaluated against measurement data from six different sites around the globe. The model predicted the correct seasonal cycle for DMS at all locations and correlated well with measurement data for most of the periods. (C) 2015 Elsevier Ltd. All rights reserved.