Targeted Observations with an Airborne Wind Lidar

Abstract This study investigates the possibilities and limitations of airborne Doppler lidar for adaptive observations over the Atlantic Ocean. For the first time, a scanning 2-μm Doppler lidar was applied for targeted measurements during the Atlantic “The Observing System Research and Predictability Experiment” (THORPEX) Regional Campaign (A-TReC) in November and December 2003. The DLR lidar system was operated for 28.5 flight hours, and measured 1612 vertical profiles of wind direction and wind speed with a horizontal and vertical resolution of 5–10 km and 100 m, respectively. On average, there were 25 reliable wind values on every profile, which cover 2500 m in the vertical (about one-third of the mean vertical extent of the profiles). A statistical comparison of 33 dropsondes and collocated lidar winds profiles allowed individual estimates of the standard deviation to be assigned to every wind value and to determine threshold values for an objective quality control of the data. The standard deviation ...

[1]  Istvan Szunyogh,et al.  The North Pacific Experiment (NORPEX-98): Targeted Observations for Improved North American Weather Forecasts , 1999 .

[2]  Pierre H. Flamant,et al.  Experimental Validation of Wind Profiling Performed by the Airborne 10-μm Heterodyne Doppler Lidar WIND , 2001 .

[3]  Evelyne Richard,et al.  Determination of airflow across the Alpine ridge by a combination of airborne Doppler lidar, routine radiosounding and numerical simulation , 2003 .

[4]  Igor N. Smalikho,et al.  Characterization of Aircraft Wake Vortices by 2-μm Pulsed Doppler Lidar , 2004 .

[5]  Shin Heu,et al.  Experimental Validation of , 1991 .

[6]  Istvan Szunyogh,et al.  Propagation of the effect of targeted observations: The 2000 Winter Storm Reconnaissance program , 2002 .

[7]  K. A. Browning,et al.  The Determination of Kinematic Properties of a Wind Field Using Doppler Radar , 1968 .

[8]  Roberto Buizza,et al.  Forecast skill of the ECMWF model using targeted observations during FASTEX , 1999 .

[9]  Istvan Szunyogh,et al.  The Effect of Targeted Dropsonde Observations during the 1999 Winter Storm Reconnaissance Program , 2000 .

[10]  J. Ackermann.  The Extinction-to-Backscatter Ratio of Tropospheric Aerosol: A Numerical Study , 1998 .

[11]  O. Reitebuch,et al.  The Alpine mountain-plain circulation: Airborne Doppler lidar measurements and numerical simulations , 2005 .

[12]  David G. H. Tan,et al.  Simulation of the yield and accuracy of wind profile measurements from the Atmospheric Dynamics Mission (ADM‐Aeolus) , 2005 .

[13]  Chris Snyder,et al.  The Fronts and Atlantic Storm-Track Experiment (FASTEX) : Scientific objectives and experimental design , 1997 .

[14]  Igor N. Smalikho,et al.  Techniques of Wind Vector Estimation from Data Measured with a Scanning Coherent Doppler Lidar , 2003 .

[15]  R. Frehlich.  Errors for Space-Based Doppler Lidar Wind Measurements: Definition, Performance, and Verification , 2001 .

[16]  Martin Wirth,et al.  Airborne Two Micron Coherent Lidar Wind Profiles , 2003 .

[17]  David S Richardson,et al.  J 7 . 1 THE 2003 ATLANTIC THORPEX REGIONAL CAMPAIGN ( TReC ) , .

[18]  Christian Werner,et al.  Summer mistral at the exit of the Rhône valley , 2005 .

[19]  R. Frehlich,et al.  Estimates of Turbulence from Numerical Weather Prediction Model Output with Applications to Turbulence Diagnosis and Data Assimilation , 2004 .

[20]  P. Drobinski,et al.  Impact of the Rhone and Durance valleys on sea-breeze Circulation in the Marseille Area , 2005 .

[21]  Richard H. Johnson,et al.  Sampling Errors in Rawinsonde-Array Budgets. , 2003 .

[22]  Sammy W. Henderson,et al.  Coherent laser radar at 2 μm using solid-state lasers , 1993, IEEE Trans. Geosci. Remote. Sens..

[23]  Chris Snyder,et al.  Overview of the field phase of the fronts and Atlantic Storm‐Track EXperiment (FASTEX) project , 1999 .