Turbulence Kinetic Energy Dissipation Rate Estimate for a Low-Level Jet with Doppler Lidar Data: A Case Study

Earth Interactions

article

Cassia M. L. Beu¹  Eduardo Landulfo¹ 

[1] Instituto de Pesquisas Energeticas e Nucleares

关键词: Atmosphere–land interaction;    Boundary layer;    Jets;    Kinetic energy;    Lidars/lidar observations;   

DOI  :  10.1175/EI-D-20-0027.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

Low-level jets are a recurrent feature of our study area in Ipero municipality of southeastern Brazil. They grow very near the surface as shown by this case study. These two aspects increase the needs for a realistic modeling of the low-level jet to simulate the atmospheric dispersion of industrial emissions. In this concern, we applied a recently proposed technique to estimate the turbulence kinetic energy dissipation rate of a low-level jet case with Doppler lidar data. This low-level jet remained for its entire lifetime (around 12 h) within a shallow layer (under 300 m); beyond this, we did not notice a remarkable directional shear as in other studies. Even for a shallow layer as for this study case, we observed strong spatiotemporal variability of the turbulence kinetic energy dissipation rate. We also detected a channel connecting the layers above and below the low-level jet that may be an exchange channel of their properties.

【 授权许可】

Unknown