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RISAssimilating 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 ...
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 ...
Year-Long Vertical Velocity Statistics Derived from Doppler Lidar Data for the Continental Convective Boundary Layer
Publisher: American Meteorological Society
Abstract: AbstractOne year of coherent Doppler lidar data collected at the U.S. Department of Energy?s Atmospheric Radiation Measurement site in Oklahoma was analyzed to provide profiles of vertical velocity variance, skewness, and ...
Long-Term Evaluation of Temperature Profiles Measured by an Operational Raman Lidar
Publisher: American Meteorological Society
Abstract: his study investigates the accuracy and calibration stability of temperature profiles derived from an operational Raman lidar over a 2-yr period from 1 January 2009 to 31 December 2010. The lidar, which uses the rotational ...
Relationship between Low-Level Jet Properties and Turbulence Kinetic Energy in the Nocturnal Stable Boundary Layer
Publisher: American Meteorological Society
Abstract: In the nighttime stable boundary layer (SBL), shear and turbulence are generated in the layer between the maximum of the low-level jet (LLJ) and the earth's surface. Here, it is investigated whether gross properties of the ...
Retrieval of Microscale Flow Structures from High-Resolution Doppler Lidar Data Using an Adjoint Model
Publisher: American Meteorological Society
Abstract: Radial velocity data measured by high-resolution Doppler lidar (HRDL) are assimilated with a four-dimensional variational data assimilation (4DVAR) method to retrieve microscale flow structures in an atmospheric boundary ...
Retrieval of Urban Boundary Layer Structures from Doppler Lidar Data. Part I: Accuracy Assessment
Publisher: American Meteorological Society
Abstract: Two coherent Doppler lidars from the U.S. Army Research Laboratory (ARL) and Arizona State University (ASU) were deployed in the Joint Urban 2003 atmospheric dispersion field experiment (JU2003) held in Oklahoma City, ...
Retrieval of Microscale Wind and Temperature Fields from Single- and Dual-Doppler Lidar Data
Publisher: American Meteorological Society
Abstract: Dual-Doppler lidar observations are used to assess the accuracy of single-Doppler retrievals of microscale wind and temperature fields in a shear-driven convective boundary layer. The retrieval algorithm, which is based ...
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 ...