Abstract
We performed numerical experiments on layered structures in the tropical mid-troposphere, which are often observed by radiosonde and airborne observations as anticorrelation between humidity and ozone, to investigate their three-dimensional structures and transport processes. We reproduced a thin layered structure of high humidity, which has a horizontal scale of about 1000 km and a vertical extent of about 1 km. Particle transport experiments around the layered structure show that the wet part of the layered structure is advected from the intertropical convergence zone by northwesterly winds, while dry parts above and below it come from the southeast direction. Streamline analysis shows that the thin layered structure is produced by vertical shear of a horizontal wind component. This shear is associated with longitudinal displacement of a stagnation point, which is located between two synoptic-scale vortices, with height.
