Investigation of the Intermittent Turbulent Breakdown of the Nocturnal Planetary Boundary Layer.

摘要

A study of the statistics of the intermittent turbulent breakdown of the stable boundary layer over flat and complex terrain was made. The study is based on the temporal behavior of the covariance of wind speed and temperature, CST. During a breakdown event, the overturning of the PBL results in high-speed warm air being transported downward toward the ground surface, and low-speed cool air being transported upward away from the ground surface. This results in a positive value of CST and a consequent flux of heat toward the ground surface. Keywords: Turbulence; Stable boundary layer; Intermittent turbulence. (jhd)