Barotropic simulation of large-scale mixing in the Antarctic polar vortex
Barotropic simulation of large-scale mixing in the Antarctic polar vortex
复制标题
南极极涡大规模混合的正压模拟
DOI：
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发表时间：
1993
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通讯作者：
K. Bowman
中科院分区：
文献类型：
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作者：
K. Bowman
理论和观测表明，南极极涡相对孤立于中纬度地区，尽管其他人对观测结果的解释表明，从涡旋内部到中纬度地区有大量的混合。本文利用Salby等的等效正压模式研究了南半球春季平流层低层大尺度气流引起的准水平混合，这一时期正是南极臭氧洞出现和消失的时期。该模型是被迫松弛观测到的气候月平均纬向平均风和理想化的波1或2强迫在较低的边界。混合和运输诊断主要通过拉格朗日示踪剂轨迹。对于9月、10月和11月的基本状态，涡旋内部几乎没有混合。混合发生在波的临界线附近：在热带和副热带的驻波1，并在中纬度地区的赤道侧翼的射流…
Abstract Theory and observations suggest that the Antarctic polar vortex is relatively isolated from midlatitudes, although others have interpreted the observations to indicate that there is substantial mixing from the interior of the vortex into middle latitudes. The equivalent barotropic model of Salby et al. is used to study quasi-horizontal mixing by the large-scale flow in the lower stratosphere during Southern Hemisphere spring, which is when the Antarctic ozone hole appears and disappears. The model is forced by relaxation to observed climatological monthly mean zonal-mean winds and by an idealized wave 1 or 2 forcing at the lower boundary. Mixing and transport are diagnosed primarily through Lagrangian tracer trajectories. For September, October, and November basic states, there is little or no mixing in the interior of the vortex. Mixing occurs near the critical lines for the waves: in the tropics and subtropics for a stationary wave 1, and in midlatitudes on the equatorward flank of the jet for ...