Proprietary Meeting of the Working Group on Space-Based Lidar Winds Sedona, Arizona February 2004 GroundWinds New Hampshire and Hawaii Updates

Proprietary GroundWinds NH Direct-detection Doppler lidar –Operates at 532 nm – Hz –0.5 meter aperture –High-resolution molecular and aerosol channels –CCD detectors – km range ASL

Proprietary GroundWinds NH Operations Operates weekly (weather permitting) ~80 days of measurements since June 2003 Operating staff reduced for efficiency and an increased focus on BalloonWinds Utilized as test bed for GroundWinds Hawaii and BalloonWinds Participated in an inter-comparison campaign

Proprietary October 2003 Campaign Objective Inter-comparison campaign with Mini- MOPA: October 24th-31 st Over 40 hours of coincident data Objective of the campaign was to address instrument –precision –accuracy –sensitivity Data in early stages of analysis

Proprietary October 2003 Campaign Precision Investigation Instrument variations –Principle component analysis Atmospheric variations –Velocity spectra –Time series cross-correlation Statistical variations –Cramer-Rao lower bound with instrument characteristics and line shape Total variation –RSS of instrument, atmospheric, and statistical variations –Variance of LOSH velocity time series

Proprietary October 2003 Campaign Accuracy Investigation Accuracy to be characterized by an inter-comparison with coincident LOSH measurements made by Mini-MOPA

Proprietary October 2003 Campaign Sensitivity Investigation Instrument sensitivity to be addressed by –Out-going laser power –Atmospheric optical properties –Instrument optical throughput –Photo-electrons detected –Detector characteristics –Precision of measurement

Proprietary GroundWinds HI Direct-detection Doppler lidar –Operates at 355 nm – Hz –0.5 meter aperture –High-resolution molecular and aerosol channels –CCD detectors – km range ASL

Proprietary GroundWinds HI Operations Operates daily (weather permitting) ~86 days of measurements since June 2003 Aerosol channel has been temporarily removed for BalloonWinds activities Performed facility maintenance after 8 months of operations Planning an instrument validation

Proprietary GroundWinds Measurement Spectral measurement deconvolved and separated into Mie, Rayleigh, and Brillouin components Frequency [1/cm] Intensity [a.u.] Brillouin Rayleigh Mie

Proprietary Scattering Models The aerosol scattering model, which includes the Mie component, is approximated by the unbroadened laser measurement The molecular scattering model, which includes the Rayleigh and Brillouin components, is approximated by the Tenti model. An improved model is currently being developed at UNH.

Proprietary GWNH Aerosol Scattering Ratio ASR=A/(A+M) 1976 Standard Atmosphere 300 K 1.0 Atm

Proprietary GWHI Aerosol Scattering Ratio ASR=A/(A+M) 1976 Standard Atmosphere 300 K 1.0 Atm

Proprietary Scientific Studies Molecular scattering model –Understanding of molecular return signal –Additional data products Aerosol optical properties –Air quality studies –Extinction:backscatter 355 & 532 nm Turbulence –Work not specific to lidars –TurbFest campaign paper submitted …

Proprietary GroundWinds Contact We welcome opportunities to collaborate with other organizations. Please contact us if you are interested in current or potential GroundWinds studies: