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RISLate-Morning Jump in TKE in the Mixed Layer over a Mountain Basin
Publisher: American Meteorological Society
Abstract: The turbulence or ?gustiness? of the winds new the surface in a mountain valley increases sharply after the nocturnal inversion layer dissipates, normally in the late morning or early afternoon. This increase?almost all ...
Vertical Wind Velocities from Superpressure Balloons: A Case Study using Eole Data
Publisher: American Meteorological Society
Abstract: A method for determining vertical wind velocities (&?) using the pressure-and temperature?change data from superpressure(constant?density) balloons was proposed in an earlier paper. In this paper, we present a case study ...
Sea Breezes Shallow and Deep on the California Coast
Publisher: American Meteorological Society
Abstract: Analyses of Doppler lidar data reveal sea breezes occurring on two different depth and time scales at Monterey Bay, California, on a day with offshore gradient flow indicated before sunrise and after sunset. The lidar data ...
Daytime Boundary-Layer Evolution over Mountainous Terrain. Part 1: Observations of the Dry Circulations
Publisher: American Meteorological Society
Abstract: This paper presents the boundary layer structure which accompanies the development of daytime local wind systems in a broad mountain valley, as revealed by cross sections of potential temperature. It describes how this ...
Daytime Boundary Layer Evolution over Mountainous Terrain. Part II: Numerical Studies of Upslope Flow Duration
Publisher: American Meteorological Society
Abstract: Numerical simulators of upslope flow forming on the lee side of a heated mountain ridge showed this flow to be a transient phenomenon, in agreement with observations. The simulations, performed with a two-dimensional, dry ...
Assimilating Coherent Doppler Lidar Measurements into a Model of the Atmospheric Boundary Layer. Part I: Algorithm Development and Sensitivity to Measurement Error
Publisher: American Meteorological Society
Abstract: A four-dimensional variational data assimilation (4DVAR) algorithm for retrieval of spatially and temporally resolved velocity and thermodynamic fields within the atmospheric boundary layer (ABL) is described and applied ...
Assimilating Coherent Doppler Lidar Measurements into a Model of the Atmospheric Boundary Layer. Part II: Sensitivity Analyses
Publisher: American Meteorological Society
Abstract: A series of trials are performed to evaluate the sensitivity of a 4DVAR algorithm for retrieval of microscale wind and temperature fields from single-Doppler lidar data. These trials use actual Doppler lidar measurements ...
Stable Boundary Layer Depth from High-Resolution Measurements of the Mean Wind Profile
Publisher: American Meteorological Society
Abstract: The depth h of the stable boundary layer (SBL) has long been an elusive measurement. In this diagnostic study the use of high-quality, high-resolution (?z = 10 m) vertical profile data of the mean wind U(z) and streamwise ...
Thunderstorm Genesis Zones in the Colorado Rocky Mountains as Determined by Traceback of Geosynchronous Satellite Images
Publisher: American Meteorological Society
Abstract: Mountain thunderstorms often originate in preferred regions of the topography, as shown qualitatively by pilot reports and more quantitatively by meteorological radar, satellite, and lightning detector studies. To further ...
Shear-Flow Instability in the Stable Nocturnal Boundary Layer as Observed by Doppler Lidar during CASES-99
Publisher: American Meteorological Society
Abstract: This study investigates a shear-flow instability observed in the stably stratified nighttime boundary layer on 6 October 1999 during the Cooperative Atmosphere?Surface Exchange Study (CASES-99) in south-central Kansas. A ...