1 / 14

NOAA P-3 Status for BAMEX

NOAA P-3 Status for BAMEX. 148 flight hours approved 20 May - 6 July Chief Scientists: Jorgensen: 20 May - 6 July, except 27-30 May & 22-24 June ( maybe ) Ziegler: 20 May - 3 June Smull: 2 June - 24 June Doppler Scientists:

amandla
Download Presentation

NOAA P-3 Status for BAMEX

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NOAA P-3 Status for BAMEX • 148 flight hours approved • 20 May - 6 July • Chief Scientists: • Jorgensen: 20 May - 6 July, except 27-30 May & 22-24 June (maybe) • Ziegler: 20 May - 3 June • Smull: 2 June - 24 June • Doppler Scientists: • Jorgensen: 20 May - 6 July, except 27-30 May & 22-24 June (maybe) • Ziegler: 20 May - 3 June • Smull: 2 June - 24 June • Cloud Physics Scientists: • Greg McFarquhar • Robert Rauber • Brian Jewett

  2. Key P-3 Objectives • NOAA P-3: • Airborne Doppler radar mapping of 3-D flows • Cloud Physics observations from ~5°C to ~-15°C • Multiple snapshots of rear inflow system structure • Coordinated legs with NRL P-3 where possible (quad Doppler) • Straight-line flight tracks in bow-echo “rear” at 18,000 ft (~-15°C) • NRL P-3: • Airborne Doppler (ELDORA) radar mapping of convective line • Multiple snapshots • Coordinated legs with NOAA P-3 where possible (quad-Doppler) • Flight level as low as practical • Straight-line flight tracks best

  3. Aircraft Hazards • NOAA P-3: • Lightning strikes near 0°C! • Wind shear at base of anvil near top of rear inflow • Aircraft charging in ice • Icing in strong stratiform regions • NRL P-3: • Strong convection near leading edge - avoid in spite of no LF radar! • Tracks within ~5 na mi. of leading edge • Tornadic activity usually from the apex of the bow northward and in “tail end charlie” supercells. • Dropsonde Jet • Avoiding leading line convective cells

  4. Airborne Doppler Scanning ELDORA ~400 m Pseudo-dual-Doppler Analysis: w from vertical divergence integration with w=0 @ echo top

  5. Optimal range for Doppler Analysis To minimize vertical velocity contamination on radial winds need to keep scanning angles < 45° R should be > h-RA Example: h~10 na mi. (50kft) RA ~ 5 na mi. (25kft) R ~ 5 na mi. H ~ 10 na mi. (50kft) RA ~ 1 na mi. (5kft) R ~ 9 na mi. RA

  6. Squall Line Example - “Quad-Doppler” Example from TOGA COARE [Jorgensen et al. 1997] NOAA P-3 NOAA P-3

  7. NOAA P-3 Flight Strategies • Basic Doppler survey module (twin legs) at 18,000 feet to facilitate switching to microphysics modules. • Complete survey in 45 min or less • Microphysics modules by NOAA P-3 will be attempted in suitable regions • Attempt at least 2 legs ~70 km system relative separation (~38 na. mi). Doppler coverage overlap of ~10 km • Where possible coordinate legs with NRL P-3

  8. System Relative Tracks Sys Rel (u=0) u=20 knts u=40 knts u=60 knts 38 nm a

  9. Microphysical Modules (NOAA P-3) • ~22 - 45 min flight pattern modules in well-developed stratiform rain regions • Lagrangian spirals • Descent rate ~ 1 m/s above 0°C, ~ 5 m/s below • Standard rate turn (~22° bank angle) • Wind is allowed to advect aircraft • Descend from ~-10°C (~6 km) through the melting level (~4 km) to as low as practical • Requires ~22-45 minutes depending on vertical extent • Perform several times • As an alternative, could fly Doppler legs at different altitudes • Either line parallel or line perpendicular oriented flight legs could be flown

  10. NOAA P-3 mphysics options

  11. Possible Flight Module Sequence ~50 na mi 42 min 33 min 45 min ~2 hrs For 6 hour on-station time ~ 3 sequences of above

  12. Flight Direction Strategies • Each aircraft has a Chief Scientist • Ops Director and Nowcaster at Ops Center • Must have reliable sat com for information exchange between these groups • Email messages • ftp of gif images • Voice (if necessary) • Ops Center to provide general guidance as to region to investigate, including suggesting end points of flight legs • Chief Scientists will fix flight legs to optimize best tracks for objectives

  13. NOAA P-3 – Ops Center Comms Global-Star, 9600 baud PPP link,:ftp, e-mail B • Observation reports • Radar images A • Flight track guidance • Hourly nowcast & short-term forecasts • Satellite & radar images

  14. Go/No Go Flight Decision • Proposal: • While at or above flight optimum flight utilization curve flight decisions will be relatively conservative (i.e., aircraft launch will be predicated on observing mesoscale organization and behavior) 100 % used 0 20 May 6 July Project Days

More Related