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The middle atmospheric meridional circulation for 2002–2012 derived from MIPAS observations

机译：2002-2012的中间气氛经络源自MIPAS观察

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Measurements of long-lived trace gases (SF 6 , CFC-11, CFC-12, HCFC-22, CCl 4 , N 2 O, CH 4 , H 2 O, and CO) performed with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) have been used to infer the stratospheric and mesospheric meridional circulation. The MIPAS data set covers the time period from July 2002 to April 2012. The method used for this purpose was the direct inversion of the two-dimensional continuity equation for the concentrations of trace gases and air density. This inversion predicts an “effective velocity” that gives the best fit for the evolution of the concentrations on the assumption that an explicit treatment of Fickian diffusion can be neglected. These effective velocity fields are used to characterize the mean meridional circulation. Multiannual monthly mean effective velocity fields are presented, along with their variabilities. According to this measure, the stratospheric circulation is found to be highly variable over the year, with a quite robust annual cycle. The new method allows us to track the evolution of various circulation patterns over the year in more detail than before. According to the effective velocity characterization of the circulation, the deep branch of the Brewer–Dobson circulation and the mesospheric overturning pole-to-pole circulation are not separate but intertwined phenomena. The latitude of stratospheric uplift in the middle and upper stratosphere is found to be quite variable and is not always found at equatorial latitudes. The usual schematic of stratospheric circulation with the deep and the shallow branch of the Brewer–Dobson circulation and the mesospheric overturning circulation is an idealization which best describes the observed atmosphere around equinox. Sudden stratospheric warmings and the quasi-biennial oscillation cause a pronounced year-to-year variability of the meridional circulation.
机译：使用Michelson干涉仪进行被动大气声音的Michelson干涉仪（ MIPAS）已被用来推断平流层和伴游的经络循环。 MIPAS数据集涵盖了2002年7月至2012年4月的时间段。用于此目的的方法是对痕量气体和空气密度浓度的二维连续性方程的直接反演。这种反演预测了“有效速度”，其使得最适合浓度的浓度，以便可以忽略非法扩散的明确治疗。这些有效速度字段用于表征平均经络循环。呈现多年每月平均有效速度字段，以及它们的变量。根据这一措施，在一年中发现平流层循环变化，年度周期相当强劲。新方法允许我们比以前更详细地追踪各个循环模式的演变。根据循环的有效速度表征，Brewer-Dobson循环的深枝和延伸杆极循环的态度倾覆的极端循环并不分开但又交织在一起的现象。发现中间平流层中的平流层隆起的纬度是相当变化的，并且并不总是在赤道纬度地区发现。平流层循环的平流层循环的常规示意图，吹水器循环的浅分支和Mesompheric倾覆循环是最能描述股份下观察到的气氛的理想化。突然的平流层升温和准两年期振荡导致经典的逐年逐年变异。

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