The impact of mid-latitude intrusions into the polar vortex on ozone loss estimates
The impact of mid-latitude intrusions into the polar vortex on ozone loss estimates
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DOI：
10.5194/acp-3-395-2003
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发表时间：
2002-12
影响因子：
6.3
通讯作者：
J. Grooß;R. Müller
中科院分区：
文献类型：
--
作者：
J. Grooß;R. Müller
目前的平流层化学模型模拟大大低估了几年一月份臭氧探空仪得出的北极臭氧损失率。到目前为止，还没有找到对这种差异的解释。在这里，我们研究了中纬度空气侵入极地涡旋对这些臭氧损失估计的影响。这项研究的重点是 1991/92 年冬季，因为据报道，在这个冬季，模拟的臭氧损失率与实验得出的臭氧损失率之间的差异最大。此外，在所考虑的时期内，涡旋受到强烈变暖事件的干扰，中纬度空气大规模侵入极地涡旋，这在一年中的这个时候是相当不寻常的。该研究基于平流层化学拉格朗日模型（CLaMS）进行的模拟。研究了两种确定臭氧损失的方法，即所谓的涡流平均法和匹配法。 1992 年 1 月的模拟表明，入侵导致涡流平均臭氧混合比降低，相当于每天约 12 ppb 的臭氧损失率的系统抵消。这应该在涡流平均方法中进行校正。模拟进一步表明，由于匹配技术中有效的质量控制措施，这些入侵不会对匹配方法造成显着偏差。
Current stratospheric chemical model simulations underestimate substantially the large ozone loss rates that are derived for the Arctic from ozone sondes for January of some years. Until now, no explanation for this discrepancy has been found. Here, we examine the influence of intrusions of mid-latitude air into the polar vortex on these ozone loss estimates. This study focuses on the winter 1991/92, because during this winter the discrepancy between simulated and experimentally derived ozone loss rates is reported to be the largest. Also during the considered period the vortex was disturbed by a strong warming event with large-scale intrusions of mid-latitude air into the polar vortex, which is quite unusual for this time of the year. The study is based on simulations performed with the Chemical Lagrangian Model of the Stratosphere (CLaMS). Two methods for determination the ozone loss are investigated, the so-called vortex average approach and the Match method. The simulations for January 1992 show that the intrusions induce a reduction of vortex average ozone mixing ratio corresponding to a systematic offset of the ozone loss rate of about 12 ppb per day. This should be corrected for in the vortex average method. The simulations further suggest, that these intrusions do not cause a significant bias for the Match method due to effective quality control measures in the Match technique.