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Stratosphere circulation is important to interpret abundances ofphoto-chemically produced compounds like ozone that we aim to observe to assesshabitability of exoplanets. We thus investigate a tidally locked ExoEarthscenario for TRAPPIST-1b, TRAPPIST-1d, Proxima Centauri~b and GJ 667 C~f with asimplified 3D atmosphere model and for different stratospheric wind breakingassumptions.  These planets are representatives for different circulation regimes fororbital periods: $P_{orb}=1-100$~days. The circulation of exoplanets with$P_{orb} \leq $ 25~days can be dominated by the standing tropical Rossby wavein the troposphere and also in the stratosphere: It leads to a strongequatorial eastward wind jet and to 'Anti-Brewer-Dobson'-circulation thatconfines air masses to the stratospheric equatorial region. Thus, thedistribution of photo-chemically produced species and aerosols may be limitedto an 'equatorial transport belt'. In contrast, planets with $P_{orb}>25$~days,like GJ~667~C~f, exhibit efficient thermally driven circulation in thestratosphere that allows for a day side-wide distribution of air masses.  The influence of the standing tropical Rossby waves on tidally lockedExoEarths with $P_{orb} \leq 25$~days can, however, be circumvented with deepstratospheric wind breaking alone - allowing for equator-to-pole transport likeon Earth. For planets with $3 \leq P_{orb} \leq 6$~days, the extratropicalRossby wave acts as an additional safe-guard against the tropical Rossby wavein case of shallow wind breaking. Therefore, TRAPPIST-1d is less prone to havean equatorial transport belt in the stratosphere than Proxima~Centauri~b.  Even our Earth model shows an equatorial wind jet, if stratosphere windbreaking is inefficient.

Stratosphere circulation on tidally locked ExoEarths