Characteristics of structure and dynamics of the planetary boundary layer in the transitional “ocean-continent” zone. Part 1. Winter period

The results of investigations of the structure and dynamics of the atmospheric planetary boundary layer in the transitional “ocean-continent” zone in the winter period, restored from the remote lidar soundings, are given. The characteristic parameters of PBL are ascertained, as well as ways of formation of its structure and dynamics. The distinctive features of PBL for a given region are shown by the examples of December 13 and 14, 2011. The mean PBL height, upper boundary of the convective layer, and the mean height of the stable layer in January and February are presented. The fact is grounded that the well-developed convection observed at nighttime is caused by existence of a low-level jet stream and high cooling altitudes of the planetary boundary layer.