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UAV2004

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Information about UAV2004
News-Reports

Published on October 7, 2007

Author: Sharck

Source: authorstream.com

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Requirements for UAVs in supercell tornado research:  Requirements for UAVs in supercell tornado research Erik Rasmussen Cooperative Institute for Mesoscale Meteorological Research National Science Foundation Anatomy of a supercell:  Anatomy of a supercell 1 mile Anatomy of a supercell:  Anatomy of a supercell Precipitation core Appendage (aka “hook echo”) Anatomy of a supercell:  Anatomy of a supercell Motion Right flank Left flank Rear flank Anatomy of a supercell:  Anatomy of a supercell updraft Anatomy of a supercell:  Anatomy of a supercell Anatomy of a supercell:  Anatomy of a supercell Looking toward the NNW Anatomy of a supercell:  Anatomy of a supercell View from SE RFD Anatomy of a supercell:  Anatomy of a supercell View from SE T Anatomy of a supercell:  Anatomy of a supercell T Anatomy of a supercell:  Anatomy of a supercell T Current issues:  Current issues What drives the Rear-Flank Downdraft (RFD)? Does the RFD have a role in the vorticity dynamics of tornado formation? Is there another source region for baroclinically-generated horizontal vorticity? What is the low-level wind profile of the inflow? What drives the rear-flank downdraft (RFD)?:  What drives the rear-flank downdraft (RFD)? Cooling from melting and evaporation? Drag of precipitation? Low-level spin and associated drop in pressure near the ground? What drives the rear-flank downdraft (RFD)?:  What drives the rear-flank downdraft (RFD)? The Descending Reflectivity Column suggests drag or evaporation. What drives the rear-flank downdraft (RFD)?:  What drives the rear-flank downdraft (RFD)? On the other hand…. Relatively warm downdrafts -> big tornadoes Relatively cool downdrafts -> small/weak tornadoes Does the RFD have a vorticity dynamics role?:  Does the RFD have a vorticity dynamics role? UAV sampling:  UAV sampling p, T, RH “microphysical” parameters UAV sampling:  UAV sampling Balloon-borne sensors cannot be lofted through the RFD; the air sinks > 20 m/s. The balloons are carried sideways away from the RFD into the nearest updraft. It is too dangerous for existing manned aircraft penetration (a demonstrated concern!) Other source regions for large near-ground horizontal vorticity:  Other source regions for large near-ground horizontal vorticity Solenoidal generation between inflow and rain-cooled air What is the low-level wind profile of the inflow?:  What is the low-level wind profile of the inflow? Horizontal vorticity Friction modeling Lowest few hundred meters The operating environment:  The operating environment RF issues: Lightning discharges generate RF energy across the spectrum. These bursts will disrupt radio communications. The electric field is huge beneath storms; we have had problems with corona discharges from instrument antennas. The operating environment:  The operating environment RF issues: Mobile assets are moving toward off-the-shelf digital technology for communications and networking. The operating environment:  The operating environment Safety issues: Research aircraft Cloud seeders Media aircraft Mobile teams and gawkers The operating environment:  The operating environment Precip-itation and/or debris Heavy rain, hail < 1 cm Heavy rain, hail up to 10 cm Blowing dust Debris lofting and fallout The operating environment:  The operating environment Near-ground (10 m) airflow 10-25 m/s 10-25 m/s 5-30 m/s Real wind The operating environment:  The operating environment Wind shear Hor shear of hor wind; 0.001 to 1/s Hor shear of vert wind; 0.01 to 0.1/s Duration:  Duration The hypotheses would benefit from 30-45 minutes of data collection. 1 to 1.5 h would be nice for cyclic events. We most likely will not investigate storms moving faster than 20 m/s, giving a domain size of <~ 60 km VORTEX-2:  VORTEX-2 First Verification of the Origins of Rotation in Tornadoes Experiment 1994-1995 VORTEX-2 planned for 2007-8. Scientific Overview Document for NSF and facilities people due this winter! Grant proposals due 1st half of next year (2005). VORTEX-2 field infrastructure:  VORTEX-2 field infrastructure 5+ mobile Doppler radars ~5 mobile mesonet vehicles Mobile sounding units Research aircraft Mobile photography teams Several mobile units for deployment of fixed in situ sensors Field coordination vehicle Other immediate uses of UAVs:  Other immediate uses of UAVs Hurricane sampling Clear-air boundary-layer work, especially sampling mesoscale fronts and storm initiation processes Airborne communication links for ground-based mobile assets in VORTEX-2 and other experiments Ras@ou.edu:  Ras@ou.edu

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