Challenges in PBL and Innovative Sensing Techniques Walter Bach Army Research Office

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Presentation transcript:

Challenges in PBL and Innovative Sensing Techniques Walter Bach Army Research Office

Current Sensing Systems Designed to support aviation – raobs, sfc. wx Modified network for NWP Integration of satellite – clouds, sfc. radiance ACARS added Wind profilers – troposphere, PBL Dense sfc. systems – often urban

Look to Future Needs & Users Small scales (0.01< X <10 km; 10 < t < 10 3 sec) – Urban Meteorology – Wind Energy – CBRN Dispersion – Military Operations – Public Health / Air Quality – Surface Transportation

Forecast Challenges - PBL Heterogeneity Surface Layer – u *, Q *, H *, stability Vertical distributions of V, T, q, tke,  Ri BL height – Z i, thickness of inversion Turbulence Parameterization Clouds / Radiation Precipitation Terrain – elevation, soils, moisture Meeting user needs

Observing Challenges Continuity, Correlation & Coherence across scales Continuity of special observing systems Few opportunities for sustained analyses PBL is 4-dimensional Volumetric measurement capability Rapid memory high resolution means rapid refresh rate Interaction with users and modelers

Some Approaches Doppler Wind Lidars – Paired - planar winds, virtual towers – Airborne – Satellite – Turbulence Profiler (concept) Backscatter Lidar Radar – FM/CW wind profiler – NetRad Distributed Network Acoustic Tomography Temperature & Moisture Profilers

Surface Based Doppler Wind Lidars Ron Calhoun, Arizona State Co-Planar Scanning for Wind field Virtual Towers OKC T-REX 9:30 PM

Airborne Doppler Wind Lidar David Emmitt, Simpson Weather Assoc. DWL wind speed profile vs. MM5 same grid volume & time 50 m DZ 30 sec

Used 20 Lidar profiles Army 3DWF Diagnostic model Derived 10 m Wind Field Yansen Wang, Army Res. Lab.

Smoke Plume

Low-cost Remote Wind Profiling SBIR Phase I - Dr Scott Shald Coherent Technologies Inc - Doppler Lidar Wind Profiling Object: Measure U,V,W at 10 Hz in 10 m increments from 10 to 100 m AGL with near sonic quality (< 0.1 m s -1 ) Purpose: Low cost, transportable instrument to measure lower BL wind velocity profile and turbulence. Augment / replace fixed towers, sodars, and 915 MHz wind radars for observations. Applications: Real time low level jets and shear – UAV’s, artillery, CBRN dispersion models Spatial variability or coherence in lower BL (lateral scales of motion) Urban wind / turbulence profiles 55 m

Low Power NetRad Antennas Specifications:  1 m x 1 m X-band antennas  2D Electronic scanning  2 degree pencil beam  Dual linear (V & H) polarization  14 degree elevation; 90 degree azimuth scan  10’s Watt average power  $10k target cost per panel (in 2005 dollars, projected 10 years ahead)

CASA Distributed Radar Network Avg. Separation 25.3 km Coverage 6947 km 2 98% coverage below NEXRAD 41% coverage is dual-Doppler (2850 km 2 ) 25% coverage below 250 m Avg. AGL NetRad – 364 m Avg. AGL NEXRAD – 1000 m Rush Springs Chickasha Lawton Cyril Goal: Map winds below 3 km with 500 m resolution David McLaughlin, U. Mass

Acoustic Tomography Vladimir Ostashev, NMSU & CIRES

NCAR REAL Lidar Backscatter 6 m range gate