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. Gravity waves are an ubiquitous feature of the atmosphere and influenceclouds in multiple ways. Regarding cirrus clouds, many studies haveemphasized the impact of wave-induced temperature fluctuations on thenucleation of ice crystals. This paper investigates the impact of the waveson the motion and distribution of ice particles, using the idealized 2-Dframework of a monochromatic gravity wave. Contrary to previous studies,special attention is given to the impact of the wind field induced by the wave. Assuming no feedback of the ice on the water vapor content, theoretical andnumerical analyses both show the existence of a wave-driven localization of ice crystals, where some ice particles remain confined in aspecific phase of the wave. The precise location where the confinement occursdepends on the background relative humidity, but it is always characterizedby a relative humidity near saturation and a positive vertical wind anomaly. Hence, the wave has an impact on the mean motion of the crystalsand may reduce dehydration in cirrus by slowing down the sedimentation of theice particles. The results also provide a new insight into the relationbetween relative humidity and ice crystals' presence. The wave-driven localization is consistent with temperature–cirrusrelationships recently observed in the tropical tropopause layer (TTL) overthe Pacific during the Airborne Tropical Tropopause EXperiment (ATTREX). Itis argued that this effect may explain such observations. Finally, the impactof the described interaction on TTL cirrus dehydration efficiency isquantified using ATTREX observations of clouds and temperature lapse rate.

Impact of gravity waves on the motion and distribution of atmospheric ice particles