GW-NH Status 25 January 2002

GW-NH Status Overview Facility Update Facility Plans Science Update Science Plans Operation Plans

GW-NH Status Facility Update

Facility Update MWO Bartlett Research Facility

Facility Update Structural fine-tuning of the instrument has been performed for ease of operation Telescope bearings tightened Laser table legged and bolted Support column vertically stabilized Dome replaced

Facility Update Laser Table Legged and Bolted

Facility Update Support Column Vertically Stabilized

Facility Update Telescope Bearings Tightened

Facility Update Dome Removal

Facility Update Dome Placement

Facility Update Dome Components

Facility Update Dome Shutter Motor

Facility Update Control Systems Various control systems have been modified Dome control system rewired and reprogrammed Etalon controller noise/jitter suppressed

Facility Update Laser Laser seeding issues Laser issues Thermal monitoring Replaced cable Replaced Piezo motor Laser issues Replaced trigger board Replaced power supply Reworked Pockels cell cable

GW-NH Status Facility Plans

Facility Plans Re-Integration Resolve laser seeding issue ASAP Full re-integration (1-week) Replace motion controller Implement fiber optic alignment system (FOAS) Test etalon controller noise reduction Post re-integration campaign (1-week) Full utilization of system to test performance Comparison with radiosondes

GW-NH Status Science Update

Science Update Turbulence Investigation (J. McHugh) Turbulence extraction algorithm is maturing Results look promising Awaiting new data to quantify the effects of noise reduction

GroundWinds AFRL

Science Update Spectral Investigations (Q. Zheng & J. Ryan) Spectral broadening model Rayleigh scattering Brillouin scattering Turbulence (Instrument function) Information in broadened spectra Temperature Pressure Kinetic energy dissipation Aerosol-molecular ratio

Science Update PBL Investigations (J. Slater & M. Prentice) PBL can be characterized by A/M profile PBL height and movement information Extinction and visibility information A and M decomposition requires a rigorous Aerosol scattering model Molecular scattering model Turbulence broadening model Instrument model

Science Update PBL Investigations (J. Slater & M. Prentice)

GW-NH Status Science Plans

Science Plans Mount Washington Valley Survey (J. McHugh) Perform sweeps over the valley at different times of day and year to characterize Turbulent regions Gravity waves Flow features over MT. Washington Diurnal and seasonal patterns Fundamental modes

Science Plans Laser-Flow Interaction Studies (J. McHugh) Fluid effects on laser Wavefront deformation Attenuation Beam steering Beam divergence Laser effects on fluid Local heating Generation of acoustic waves

Science Plans Depolarization Ratio Measurements Measure the depolarization ratio of the backscattered beam Depolarization ratio profile will help quantify the composition, size, and shape of aerosols Distinguish ice, water, and dust

Science Plans Depolarization Ratio Measurements

Science Plans Depolarization Ratio Measurements

Science Plans Instrument Optimization Determine the optimum GW setup for a given investigation Timing Altitude binning Azimuth angle/sweep rate Time of day/year Feasibility studies

GW-NH Status Operation Plans

Operation Plans Goal: 50% up-time Implement science plans Web-based form for outside investigators General science objective Specific science objective GW-NH data product GW-NH setup (timing, altitude binning, etc.) Collaborating personnel ivan.dors@unh.edu