Seasonal persistence of northern low- and middle-latitude anomalies of ozone and other trace gases in the upper stratosphere
Seasonal persistence of northern low- and middle-latitude anomalies of ozone and other trace gases in the upper stratosphere
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北部低纬度和中纬度平流层上层臭氧和其他微量气体异常的季节性持续
DOI：
10.1029/2008jd009860
复制
发表时间：
2008
影响因子：
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通讯作者：
T. Shepherd
中科院分区：
文献类型：
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作者：
S. Tegtmeier;V. Fioletov;T. Shepherd
[1]对在北方半球低纬度和中纬度观测到的臭氧廓线的分析表明，平流层低层和平流层高层的臭氧异常具有季节性持续性。主成分分析表明，在16 hPa以上，15-45°N纬度带的持续性最强，而在16 hPa以下，45-60°N纬度带的持续性最强。在这两种情况下，臭氧异常从11月到10月持续了一整年。平流层下部臭氧异常的持续性可能与冬季臭氧积累以及随后的夏季光化学弛豫有关，如先前发现的臭氧总量。在平流层上部的持久性更令人惊讶，考虑到牛在这些高度的短暂寿命。据推测，这种“季节性记忆”在上层平流层臭氧异常来自运输引起的冬季NOy异常，然后扰动整个一年的其余时间的臭氧化学的季节性持久性。这一假设得到证实的分析观测的NO2，NOx，和各种长寿命的微量气体在平流层上部，发现表现出相同的季节性持久性。以往的研究将冬季对流层外平流层臭氧的年与年之间的变化归因于准两年振荡（QBO），通过运输引起的NOy（因此NO2）异常，但没有确定QBO和夏季臭氧变化之间的任何统计联系。我们的研究结果意味着，通过这种“季节记忆”，QBO在低到中纬度平流层上部的臭氧在夏季和初秋有一个异步的影响。
[1] Analysis of observed ozone profiles in Northern Hemisphere low and middle latitudes reveals the seasonal persistence of ozone anomalies in both the lower and upper stratosphere. Principal component analysis is used to detect that above 16 hPa the persistence is strongest in the latitude band 15–45°N, while below 16 hPa the strongest persistence is found over 45–60°N. In both cases, ozone anomalies persist through the entire year from November to October. The persistence of ozone anomalies in the lower stratosphere is presumably related to the wintertime ozone buildup with subsequent photochemical relaxation through summer, as previously found for total ozone. The persistence in the upper stratosphere is more surprising, given the short lifetime of Ox at these altitudes. It is hypothesized that this “seasonal memory” in the upper stratospheric ozone anomalies arises from the seasonal persistence of transport-induced wintertime NOy anomalies, which then perturb the ozone chemistry throughout the rest of the year. This hypothesis is confirmed by analysis of observations of NO2, NOx, and various long-lived trace gases in the upper stratosphere, which are found to exhibit the same seasonal persistence. Previous studies have attributed much of the year-to-year variability in wintertime extratropical upper stratospheric ozone to the Quasi-Biennial Oscillation (QBO) through transport-induced NOy (and hence NO2) anomalies but have not identified any statistical connection between the QBO and summertime ozone variability. Our results imply that through this “seasonal memory,” the QBO has an asynchronous effect on ozone in the low to midlatitude upper stratosphere during summer and early autumn.
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SAGE II 测量的背景气溶胶 - 季节周期和准两年振荡 (QBO)
DOI：
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发表时间：
2006
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影响因子：
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作者：
M.;Niwano
通讯作者：
Niwano