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RISCharacterization of the Diurnal Cycle of the West African Monsoon around the Monsoon Onset
Publisher: American Meteorological Society
Abstract: This study investigates the diurnal cycle of the West African monsoon and its seasonal modulation with particular focus on the monsoon onset period. A composite analysis around the monsoon onset date is applied to the ...
Turbulence Anisotropy Carried by Streaks in the Neutral Atmospheric Surface Layer
Publisher: American Meteorological Society
Abstract: The authors investigate the relationships between coherent structures and turbulence anisotropy in the neutral planetary boundary layer by means of empirical orthogonal function (EOF) analysis of large-eddy simulation (LES) ...
Diurnal Cycle of Water Vapor as Documented by a Dense GPS Network in a Coastal Area during ESCOMPTE IOP2
Publisher: American Meteorological Society
Abstract: Global positioning system (GPS) data from a dense network have been used for the analysis of the diurnal cycle of water vapor over Marseille, France, during the second intensive observation period (IOP2; 21?26 June 2001) ...
Remote Measurement of Turbulent Wind Spectra by Heterodyne DopplerLidar Technique
Publisher: American Meteorological Society
Abstract: Heterodyne Doppler lidars (HDLs) are used to monitor atmospheric wind field and wind turbulence at remote distance. This last application calls for the derivation of wind spectra, which can be characterized by the dissipation ...
Velocity Biases of Adaptive Filter Estimates in Heterodyne Doppler Lidar Measurements
Publisher: American Meteorological Society
Abstract: Frequency estimates by heterodyne Doppler lidar (HDL) may result in velocity bias due to the atmospheric speckle effect and an asymmetrical power spectrum of the probing pulse, as discussed in a previous paper by Dabas et ...
Chirp-Induced Bias in Velocity Measurements by a Coherent Doppler CO2 Lidar
Publisher: American Meteorological Society
Abstract: Radial wind velocity measurements by a pulsed CO2 Doppler lidar may be biased even in stationary atmospheric conditions. The authors show it is due to random speckle fluctuations of the backscattered signal and is related ...
Adaptive Filters for Frequency Estimate of Heterodyne Doppler Lidar Returns: Recursive Implementation and Quality Control
Publisher: American Meteorological Society
Abstract: Unreliable frequency estimates at low signal-to-noise ratios, provided by a heterodyne Doppler lidar (HDL), undermines any data analysis scheme requiring high-accuracy wind fields retrievals. To meet demanding specifications, ...
Modeling Land–Atmosphere Interactions over Semiarid Plains in Morocco: In-Depth Assessment of GCM Stretched-Grid Simulations Using In Situ Data
Publisher: American Meteorological Society
Numerical and Experimental Investigation of the Neutral Atmospheric Surface Layer
Publisher: American Meteorological Society
Abstract: This study combines the experimental measurements with large-eddy simulation (LES) data of a neutral planetary boundary layer (PBL) documented by a 60-m tower instrumented with eight sonic anemometers, and a high-resolution ...
Comparison of Horizontal and Vertical Scintillometer Crosswinds during Strong Foehn with Lidar and Aircraft Measurements
Publisher: American Meteorological Society
Abstract: Measurements of the horizontal and vertical wind component by a crosswind scintillometer during foehn, the chinooklike downslope windstorm in the Alps, are presented. Because of the sparsity of vertical velocity measurements ...