Impact of BrO on dimethylsulfide in the remote marine boundary layer
Impact of BrO on dimethylsulfide in the remote marine boundary layer
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DOI：
10.1029/2009gl040868
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发表时间：
2010-01-29
影响因子：
5.2
通讯作者：
Spracklen, D. V.
中科院分区：
文献类型：
--
作者：
Breider, T. J.;Chipperfield, M. P.;Spracklen, D. V.
我们已经使用了一个全球性的三维化学传输模式耦合到一个详细的尺寸分辨气溶胶微物理模块，研究溴对二甲基硫（DMS）在遥远的海洋边界层的影响。我们的模型结果表明，BrO贡献了全球每年DMS氧化汇的16%。这种影响在SH海洋上最为深刻，在SH海洋中，低NOx浓度和高海盐气溶胶源，加上高DMS浓度，驱动BrO对DMS氧化的大贡献（>20%）。溴化学还可使全球二甲硫醚的负荷和使用寿命减少18%。此外，当我们使用替代DMS源参数化导致DMS通量增加2倍时，在南半球夏季，由于额外的气溶胶酸度，海盐气溶胶中溴的释放增加了50-60%。这表明可能存在DMS-SO2-海盐-BrO海洋气溶胶反馈机制，该机制可降低二甲基硫醚寿命对二甲基硫醚排放量增加的敏感性。引用：Breider，T. J.，M. P. Chipperfield，N. A. D.理查兹，K. S. Carslaw，G. W. Mann和D. V. Spracklen（2010年），《溴对远程海洋边界层中二甲基硫的影响》，地球物理学。保留信函：37，L02807，doi：10.1029/2009GL040868。
We have used a global three-dimensional chemical transport model coupled to a detailed size-resolved aerosol microphysics module to study the impact of BrO on dimethylsulfide (DMS) in the remote marine boundary layer. Our model results suggest BrO contributes 16% of the global annual DMS oxidation sink. This effect is most profound over the SH oceans where low NOx concentrations and a high sea salt aerosol source, coupled with high DMS concentrations, drives a large contribution of BrO to DMS oxidation (>20%). Bromine chemistry also results in an 18% reduction in the global DMS burden and lifetime. In addition, when we use an alternative DMS source parameterization resulting in a factor 2 increase in DMS flux the release of bromine from sea salt aerosol increases by 50-60% in the southern hemisphere summer because of additional aerosol acidity. This suggests a possible DMS-SO2-sea salt-BrO marine aerosol feedback mechanism that acts to reduce the sensitivity of the DMS lifetime to increases in DMS emission. Citation: Breider, T. J., M. P. Chipperfield, N. A. D. Richards, K. S. Carslaw, G. W. Mann, and D. V. Spracklen (2010), Impact of BrO on dimethylsulfide in the remote marine boundary layer, Geophys. Res. Lett., 37, L02807, doi:10.1029/2009GL040868.