气象Issue(10)：1165-1173,9.DOI:10.7519/j.issn.1000-0526.2014.10.001
高原东南缘大气近地层湍能特征与边界层动力、热力结构相关特征
Relationship Between Turbulent Energy in the Near-Surface Layer and Atmospheric Boundary Layer Thermodynamic Structure over the Southeastern Side of Tibetan Plateau
摘要
Abstract
Based on the data observed from an intensive GPS sounding experiment and the comprehensive measurements of boundary layer in Dali of Yunnan Province during March,May and July 2008,the heights of CBL (convective boundary layer)and SBL (stable boundary layer)are calculated with approaches of temperature gradient and inversion layer strength and sensible heat flux,latent heat flux,turbulent kinetic energy,shear item and buoyancy item are obtained with eddy-correlation method.The apparent heat source Q1 ,which is calculated from the NCEP reanalysis data,presents the similar diurnal cycles to the turbulent energy components and turbulent flux,reflecting a close connection of the plateau’s heat source variations with the diurnal changes in turbulent transport of hydrothermal process in the underlying surface.The comprehensive analysis on the vertical profiles of variables about turbulence and thermody-namics reveals the significant correlations among sensible heat flux,latent heat flux,apparent heat source and buoyancy item,implying an important contribution of thermodynamic turbulence transport to the Q1 in the near-surface layer over the southeastern edges of the Tibetan Plateau.The buoyancy item and turbu-lent energy play an important role in formation of the near-surface Q1 ,vortex dynamics,thermodynamic mixing structure.The lower layer Q1 and moisture sink are closely associated with the boundary layer height.This comprehensive analysis describs a physical linkage of thermodynamic turbulence transport with atmospheric heat source,vortex dynamical process and thermodynamic mixing layer structure to un-derstand the interaction of turbulence-convection and atmospheric thermodynamic process in the active con-vection region over the southeastern edges of the Tibetan Plateau.关键词
湍流通量/湍能分量/大气动力/热力结构/边界层高度Key words
turbulent flux/turbulent energy component/atmospheric dynamic/thermodynamic structure/boundary layer height分类
天文与地球科学引用本文复制引用
徐祥德,王寅钧,赵天良,姚文清..高原东南缘大气近地层湍能特征与边界层动力、热力结构相关特征[J].气象,2014,(10):1165-1173,9.基金项目
国家自然科学基金重点项目（41130960）、公益性行业（气象）科研专项（GYHY201406001）和中日合作计划 JICA 项目共同资助 （）
