Nighttime mesospheric ozone enhancements during the 2002 southern hemispheric major stratospheric warming
Nighttime mesospheric ozone enhancements during the 2002 southern hemispheric major stratospheric warming
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2002年南半球主要平流层变暖期间夜间中层臭氧增强
DOI：
10.1016/j.jastp.2017.12.018
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发表时间：
2018
影响因子：
1.9
通讯作者：
Pérot, Kristell
中科院分区：
文献类型：
--
作者：
Smith-Johnsen, Christine;Orsolini, Yvan;Stordal, Frode;Limpasuvan, Varavut;Pérot, Kristell
平流层突然变暖（SSW）影响中层大气的化学和动力学。北半球（NH）大约每隔一个冬天就会出现一次大的变暖，但在南半球（SH）只观测到一次，即2002年的南极冬季。在这一罕见事件期间，Envisat上搭载的全球掩星臭氧监测系统（GOMOS）的观测显示，与非ssw年相比，亚极纬度地区夜间次级臭氧层的臭氧增加了40%。本文利用美国国家大气研究中心（NCAR）的特定动力学全大气群落气候模式（SD-WACCM）研究了中层夜间臭氧增加的原因。2002年SH冬季的特点是平流层上层的极夜急流在急流完全逆转之前强度减弱了几次，标志着主要的西南副风的开始。在这些风减少的时候，在模拟的夜间二次臭氧层中可以看到相应的间歇性增加。臭氧的增加主要是由于上升流的增强和与之相关的高空区域的降温，以及风的逆转。这与海温引起的北半球臭氧增强的类似研究相一致。但与北半球不同的是，北半球次级臭氧层似乎较少受到氢原子的偶发性变化的影响。然而，相对于NH，季节性减少的氢原子在SH中起着更大的作用。
Sudden Stratospheric Warmings (SSW) affect the chemistry and dynamics of the middle atmosphere. Major warmings occur roughly every second winter in the Northern Hemisphere (NH), but has only been observed once in the Southern Hemisphere (SH), during the Antarctic winter of 2002. Observations by the Global Ozone Monitoring by Occultation of Stars (GOMOS, an instrument on board Envisat) during this rare event, show a 40% increase of ozone in the nighttime secondary ozone layer at subpolar latitudes compared to non-SSW years. This study investigates the cause of the mesospheric nighttime ozone increase, using the National Center for Atmospheric Research (NCAR) Whole Atmosphere Community Climate Model with specified dynamics (SD-WACCM). The 2002 SH winter was characterized by several reductions of the strength of the polar night jet in the upper stratosphere before the jet reversed completely, marking the onset of the major SSW. At the time of these wind reductions, corresponding episodic increases can be seen in the modelled nighttime secondary ozone layer. This ozone increase is attributed largely to enhanced upwelling and the associated cooling of the altitude region in conjunction with the wind reversal. This is in correspondence to similar studies of SSW induced ozone enhancements in NH. But unlike its NH counterpart, the SH secondary ozone layer appeared to be impacted less by episodic variations in atomic hydrogen. Seasonally decreasing atomic hydrogen plays however a larger role in SH compared to NH.
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DOI：
10.1002/jgrd.50651
发表时间：
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期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
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