Revisiting the hemispheric asymmetry in midlatitude ozone changes following the Mount Pinatubo eruption: A 3-D model study.
Revisiting the hemispheric asymmetry in midlatitude ozone changes following the Mount Pinatubo eruption: A 3-D model study.
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DOI：
10.1002/2015gl063052
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发表时间：
2015-04-28
影响因子：
5.2
通讯作者：
Santee, M. L.
中科院分区：
文献类型：
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作者：
Dhomse, S. S.;Chipperfield, M. P.;Feng, W.;Hossaini, R.;Mann, G. W.;Santee, M. L.
皮纳图博火山爆发后，卫星和现场测量显示，在两个半球的平流层气溶胶的大幅度增强，但显着的中纬度柱O3损耗只在北部观察到。我们使用三维化学传输模型来确定这种半球不对称背后的机制。该模型由欧洲中期天气预报中心ERA-中期再分析和更新的气溶胶表面积密度所推动，成功地模拟了观测到的大柱NO2减少和两个半球臭氧消耗的不同程度。北方和南半球的臭氧化学损失是相似的，但动力学的对比作用增加了北方的臭氧消耗，减少了南半球的臭氧消耗。早期的ERA-40再分析也没有捕捉到相关的SH动力学。总的来说，较小的SH柱O3消耗可以归因于动力学变化和较小的SH背景较低的平流层O3浓度。模型成功模拟了Pinatubo火山爆发后的NO2和O3变化VSLS化学将臭氧损失放大了约2% ERA-临时数据有助于改善NO2和O3损失的代表性
Following the eruption of Mount Pinatubo, satellite and in situ measurements showed a large enhancement in stratospheric aerosol in both hemispheres, but significant midlatitude column O3 depletion was observed only in the north. We use a three‐dimensional chemical transport model to determine the mechanisms behind this hemispheric asymmetry. The model, forced by European Centre for Medium‐Range Weather Forecasts ERA‐Interim reanalyses and updated aerosol surface area density, successfully simulates observed large column NO2 decreases and the different extents of ozone depletion in the two hemispheres. The chemical ozone loss is similar in the Northern (NH) and Southern Hemispheres (SH), but the contrasting role of dynamics increases the depletion in the NH and decreases it in the SH. The relevant SH dynamics are not captured as well by earlier ERA‐40 reanalyses. Overall, the smaller SH column O3 depletion can be attributed to dynamical variability and smaller SH background lower stratosphere O3 concentrations. Model successfully simulates NO2 and O3 changes after Pinatubo eruption VSLS chemistry amplifies ozone losses by about 2% ERA‐Interim data helps to improve representation of NO2 and O3 losses