Boundary Layer, Urban Meteorology and Land-Surface Processes

Thermodynamic and Kinematic Characteristics of the Nocturnal Boundary Layer under Differing Turbulent Regimes

Tim Bonin
OU School of Meteorology

31 October 2014, 3:00 PM

National Weather Center, Room 5600
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

The intensity, extent, and continuity of turbulence in the nocturnal stable boundary layer (SBL) is governed by many interacting processes and features. Generally, SBLs can be grouped into two broad categories: weakly stable and very stable. While the weakly SBL is relatively well understood and can be described by Monin-Obukhov similarity theory or other local scaling laws, the very SBL is difficult to characterize and parameterize. It is also difficult to predict which type of SBL will form nocturnally and whether or not the SBL will transition into the other type overnight.

To investigate the SBL in detail, Doppler lidar, sonic anemometer, and Atmospheric Emitted Radiance Interferometer (AERI) measurements were analyzed from the Lower Atmospheric Boundary Layer Experiment (LABLE-I). LABLE-I was a multi-institutional field campaign that took place from 18 September to 13 November 2012 at the Southern Great Plains ARM site. During the experiment, low-level jets (LLJs) were frequently observed and interacted with both weakly and strongly SBLs. Within this presentation, the relationship of turbulence, thermodynamic, and wind profiles of differing NBLs is discussed. Several case studies of LLJs with very different turbulence profiles will be shown. Additionally, generalizations of the NBL are made by combining all the nocturnal data from LABLE-I.

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Boundary Layer, Urban Meteorology and Land-Surface Processes Seminar Series website