Experimental characterization of atmospheric boundary layer humidity profile

2018 ◽  
Vol 144 (3) ◽  
pp. 1707-1708
Author(s):  
Teresa J. Ryan ◽  
Joseph F. Vignola ◽  
John Judge ◽  
Diego Turo
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Experimental Characterization ◽  
Humidity Profile

scholarly journals Experimental characterization of the turbulent boundary layer over a porous trailing edge for noise abatement

2019 ◽  
Vol 443 ◽  
pp. 537-558 ◽  
Author(s):  
Alejandro Rubio Carpio ◽  
Roberto Merino Martínez ◽  
Francesco Avallone ◽  
Daniele Ragni ◽  
Mirjam Snellen ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Experimental Characterization ◽  
Trailing Edge ◽  
Noise Abatement

scholarly journals High-Resolution Observations of Insects in the Atmospheric Boundary Layer

2008 ◽  
Vol 25 (12) ◽  
pp. 2176-2187 ◽  
Author(s):  
Robert F. Contreras ◽  
Stephen J. Frasier
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Cross Sections ◽  
Continuous Monitoring ◽  
Rayleigh Scattering ◽  
Continuous Wave ◽  
Time Of Day ◽  
Fmcw Radar ◽  
Radar Cross Sections

Abstract High spatial and temporal resolution S-band radar observations of insects in the atmospheric boundary layer (ABL) are described. The observations were acquired with a frequency-modulated continuous-wave (FMCW) radar during the 2002 International H20 Project (IHOP_2002) held in Oklahoma in the months of May and June 2002. During the observational period the boundary layer was convective with a few periods of rain. Rayleigh scattering from particulate scatterers (i.e., insects) dominates the return; however, Bragg scattering from refractive index turbulence is also significant, especially at the top of the afternoon boundary layer. There is a strong diurnal signal in the insect backscatter: minima in the morning and at dusk and maxima at night and midafternoon. Insect number densities and radar cross sections (RCSs) are calculated. The RCS values range from less than 10−12 m2 to greater than 10−7 m2 and likewise have a strong diurnal signal. These are converted to equivalent reflectivity measurements that would be reported by typical meteorological radars. The majority of reflectivity measurements from particulate scatterers ranges from −30 to −5 dBZ; however, intense point scatterers (>10 dBZ) are occasionally present. The results show that although insects provide useful targets for characterization of the clear-air ABL, the requirements for continuous monitoring of the boundary layer are specific to time of day and range from −20 dBZ in the morning to −10 to −5 dBZ in the afternoon and nocturnal boundary layer (NBL).

scholarly journals Characterization of the Vertical Structure of Coastal Atmospheric Boundary Layer over Thumba (, ) during Different Seasons

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Sandhya K. Nair ◽  
T. J. Anurose ◽  
D. Bala Subrahamanyam ◽  
N. V. P. Kiran Kumar ◽  
M. Santosh ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Turbulent Flow ◽  
Atmospheric Boundary Layer ◽  
Mixed Layer ◽  
Seasonal Variability ◽  
Potential Temperature ◽  
Sea Breeze ◽  
The Other ◽  
Vertical Thickness

Vertical profiles of meteorological parameters obtained from balloon-borne GPS Radiosonde for a period of more than two years are analyzed for characterization of the coastal atmospheric boundary layer (CABL) over Thumba (, , India). The study reports seasonal variability in the thickness of three different sublayers of the CABL, namely, mixed layer, turbulent flow, and sea breeze flow. Among the three, the vertical thickness of sea breeze flow showed considerable dominance on the other two throughout the year. Mixed layer heights derived through gradients in virtual potential temperature () showed large seasonal variability with a peak in the Summer and Post-Monsoon. On the other hand, the vertical thickness of turbulent flow remained steady all through the year. Results from the present study indicate that the magnitudes of mixed layer heights are often larger than the turbulent flow thickness.

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