Status of the P3DWL investigations on NOAA aircraft Emmitt (SWA) Atlas(AOML/NOAA) Eleuterio (ONR/USNavy) DWL WG Meeting 24 – 26 August 2010 Bar Harbor, Me

Status Summary Waiting for installation

Outline Instrument/aircraft Upgrades since TPARC Collaborators at NOAA/AOML 2010 season plans Long term plans

Upgrades since TPARC Funded by ONR Problem: Sticky scanner rotation at high > 6km flight levels (cold temperatures);Solution: heat strips on scanner bearings Problem: lost of a few dB through scanner windows; Solution: Bigger windows, re-polished windows, AR coatings. Problem: Overheating before takeoff; Solution: higher capacity chiller. Problem: Erratic and old GPS/INS; Solution: purchased new GPS/INS.

General Plan Participate in NOAA’s HFIP 2010 including coordinated flights with GRIP aircraft, especially the DAWN system being flown on the NASA DC-8. Use much of the P3DWL system flown on the NRL P3 in ONR funded modifications include: – Redesign of bi-axial scanner to eliminate sticking at low temperatures – Enlarge windows and recoat to improve throughput – Replace heat exchanger with more efficient cooler – Replace borrowed GPS/INS with new unit – Build new rack required for NOAA P3 installation – Acquire new data system from LMCT

Participants Frank Marks Sylvia Lorsolo Bob Atlas Jun Zhang Dave Ligon James McFadden and Terry Lynch Robert Rogers Dan Carre’

OrganizationContributionContact ONR Funding for fabrication of rack, scanner housing, GPS, chiller, nitrogen control system, software modifications and other aircraft accommodation elements Ron Ferek ARL RASP, AFE, power supply, software mods Dave Ligon NASA/LaRC Bi-axial scanner elements and drivers SWA PI,Operations, GPS integration, post processing software Dave Emmitt NOAAAccommodations on NOAA P3, science support, mission support Frank Marks

P3DWL for HFIP um coherent WTX (ARL/LMCT) 10 cm bi-axis scanner (NASA) P3 and other parts (NRL) Analyses software (SWA/CIRPAS)

Bi-axial scanner and instrument rack

Data Products Region of regard – +/- 30 degrees azimuth; +/- 120 degrees elevation – Flight level (-200m) to surface – Flight level (+200m) to 15km (aerosol and clouds permitting) – Forward to 15km (nominal 6-10 in PBL and 1 – 3 above) Resolution – 50 meter overlapped range gates (Gausian pulse ~ 90 m long) – 500 Hz rep rate (~.5 meter along flight track)

Data Products (2) 3D wind profiles (u,v,w) – 12 point step-stare scan pattern with degree nadir cone (half angle) –.5 – 2 second dwells with 1 second transition gaps – On P3 a full profile takes ~ 30 seconds (3km) – 4 point profiles provide better than 1 km horizontal spacing – Special processing required within 200 meters of the surface

Data Products (3) Vertical and flight level stares – Nadir stares provide Vertical velocity only measurements Water surface elevations, depths of LAS, wave spectra – Zenith stares Vertical velocity only measurements Hydrometeor detection and fall velocities – FL stares provide Detection of thermals, OLEs, gravity waves ahead of aircraft

Data Products (4) Backscatter (attenuated) profiles and aerosol structures – Organized Large Eddies – Mixed layer heights – Aerosol pumping by cloud convection Turbulence – Within the illuminated volume (~.1m X 100m) Broadening of spectral features – Between shots (~.5m X 100m)

Summary Waiting for installation