Extreme Change Events of Stratospheric HCl and N2O in the Mid-Latitude Region of the Northern Hemisphere
Extreme Change Events of Stratospheric HCl and N2O in the Mid-Latitude Region of the Northern Hemisphere
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北半球中纬度地区平流层HCl和N2O极端变化事件
DOI：
10.3390/rs14236114
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发表时间：
2022-12
期刊：
影响因子：
5
通讯作者：
Wuhu Feng
中科院分区：
文献类型：
--
作者：
Yuanyuan Han;Fei Xie;Fei Cui;Feiyang Wang;Xin Li;Wuhu Feng
氯化氢（HCl）是氯的主要储存物质，一氧化二氮（N2 O）的化学分解是平流层中NOx（=NO + NO2）的主要来源。平流层HCl和N2 O的变化在调节平流层臭氧的变化方面起着关键作用。因此，平流层HCl和N2 O的长期趋势已在许多研究中进行了调查，而短期变化尚未得到足够的重视。本文利用卫星观测资料和化学输送模式发现，近几十年来，在北方半球中纬度平流层中、低层发生了两次HCl和N_2O的极端变化事件，其特征是HCl在几个月内急剧增加，而N_2O在几个月内减少;例如，HCl在1987/1988年增加了0.135 ppbv（-33.352 ppbv），而N2 O在2010/2011年增加了0.196 ppbv（-28.553 ppbv）。进一步分析表明，这两个时段平流层HCl和N2 O的极端变化事件与半年振荡的强东风位相和强极涡共同作用引起的异常剩余环流密切相关。
Hydrogen chloride (HCl) is the main reservoir species of chlorine and chemical decomposition of nitrous oxide (N2O) is the primary source of NOx (=NO + NO2) in the stratosphere. Changes in stratospheric HCl and N2O play a critical role in modulating variations in stratospheric ozone. Thus, long-term trends in stratospheric HCl and N2O have been investigated in many studies, whereas short-term changes have not received enough attention. Here, using satellite observations and a chemical transport model, we found that two extreme change events for HCl and N2O in the Northern Hemisphere mid-latitude middle and lower stratosphere have occurred over past decades, which are characterized by a sharp increase in HCl and a decrease in N2O over several months; for example, HCl increased (and N2O decreased) by 0.135 ppbv (−33.352 ppbv) in 1987/1988 and by 0.196 ppbv (−28.553 ppbv) in 2010/2011. Further analysis shows that the extreme change events of stratospheric HCl and N2O in these two periods are closely related to anomalous residual circulation caused by the joint effects of the strong easterly phase of the semi-annual oscillation and the strong polar vortex.
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