Seasonal variation of ozone in the tropical lower stratosphere: Southern tropics are different from northern tropics
Seasonal variation of ozone in the tropical lower stratosphere: Southern tropics are different from northern tropics
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DOI：
10.1002/2013jd021294
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发表时间：
2014-05
期刊：
影响因子：
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通讯作者：
R. Stolarski;D. Waugh;Lei Wang;L. Oman;A. Douglass;P. Newman
中科院分区：
文献类型：
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作者：
R. Stolarski;D. Waugh;Lei Wang;L. Oman;A. Douglass;P. Newman
我们使用各种仪器，包括臭氧探测仪，光环微波临边探测仪，平流层气溶胶和气体实验II的测量，研究臭氧的季节性行为。我们发现，臭氧的年度变化的幅度，作为平均臭氧的百分比，表现出最大或略高于热带对流层顶。北方热带地区臭氧年最大值比南方热带地区大，且南方热带地区臭氧年最大值比北方热带地区晚2个月，这与通常认为的热带地区是水平均匀区的假设相反。在平流层低层的这一部分，臭氧和其他物种的季节性循环是布鲁尔-多布森环流季节性变化和热带和中纬度混合季节性变化共同作用的结果。在北方半球，上升流和热带与中纬度之间的混合对臭氧的影响是同相和相加的。在南半球，它们不同步。我们应用热带漏管模型独立的每个半球检查上升流和混合在北方和南部热带地区的相对作用。对上升流和混合的季节性变化的合理假设可以很好地描述热带南部和北方的季节性大小和相位。北方和南方热带平流层之间示踪剂和输送的差异表明，需要修改混合热带的范例，以考虑热带地区内的纬度变化。
We examine the seasonal behavior of ozone by using measurements from various instruments including ozonesondes, Aura Microwave Limb Sounder, and Stratospheric Aerosol and Gas Experiment II. We find that the magnitude of the annual variation in ozone, as a percentage of the mean ozone, exhibits a maximum at or slightly above the tropical tropopause. The maximum is larger in the northern tropics than in the southern tropics, and the annual maximum of ozone in the southern tropics occurs 2 months later than that in the northern tropics, in contrast to usual assumption that the tropics can be treated as a horizontally homogeneous region. The seasonal cycles of ozone and other species in this part of the lower stratosphere result from a combination of the seasonal variation of the Brewer–Dobson circulation and the seasonal variation of tropical and midlatitude mixing. In the Northern Hemisphere, the impacts of upwelling and mixing between the tropics and midlatitudes on ozone are in phase and additive. In the Southern Hemisphere, they are not in phase. We apply a tropical leaky pipe model independently to each hemisphere to examine the relative roles of upwelling and mixing in the northern and southern tropical regions. Reasonable assumptions of the seasonal variation of upwelling and mixing yield a good description of the seasonal magnitude and phase in both the southern and northern tropics. The differences in the tracers and transport between the northern and southern tropical stratospheres suggest that the paradigm of well‐mixed tropics needs to be revised to consider latitudinal variations within the tropics.