Principal Investigator(s): Paul Reasor (lead), Sim Aberson, Jason Dunion, John Kaplan, Rob Rogers, Eric Uhlhorn, Jun Zhang, Michael Riemer (Johannes Gutenberg-Universität) Objective: Sample the wind, temperature and moisture fields within and around a tropical cyclone experiencing a significant increase in environmental vertical wind shear. What to Target: The core region of a tropical cyclone experiencing a significant increase in environmental vertical wind shear, but with minimal land interaction and positioned away from a significant gradient of sea surface temperature. When to Target: Before a significant increase in environmental vertical wind shear. The P-3 should be coordinated with the corresponding G-IV mission. P-3 core-region survey pattern Figure 7-2: “pre-shear” Altitude: 12,000 ft (4 km) altitude preferable. Expendables: Deploy dropsondes at center of first pass, RMW, and 1.2xRMW of Figure-4 legs (if no G-IV, then also at turn points). Deploy dropsondes at turn points (vertices) and mid points of octagonal flight pattern legs. No more than 42 drops needed (25 if G-IV present and second Figure-4 not performed). Pattern: The pattern is flown with respect to the surface storm center. Radial legs of the initial Figure-4 pattern extend to 4.5xRMW, where RMW is the estimated radius of maximum azimuthal-mean tangential wind. For example, if RMW = 18 nm, the maximum radial extent of the pattern is 81 nm. The aircraft then turns inbound and performs a counter-clockwise octagonal circumnavigation at a radius of 2xRMW. If time permits, additional passes may be done from to and from to 14’ 15’, 16’ FP’. Instrumentation: Set airborne Doppler radar to scan F/AST on all legs. Tropical Cyclone in Shear Experiment
Principal Investigator(s): Paul Reasor (lead), Sim Aberson, Jason Dunion, John Kaplan, Rob Rogers, Eric Uhlhorn, Jun Zhang, Michael Riemer (Johannes Gutenberg-Universität) Objective: Sample the wind, temperature and moisture fields within and around a tropical cyclone experiencing a significant increase in environmental vertical wind shear. What to Target: The core region of a tropical cyclone experiencing a significant increase in environmental vertical wind shear, but with minimal land interaction and positioned away from a significant gradient of sea surface temperature. When to Target: Before a significant increase in environmental vertical wind shear. The P-3 should be coordinated with the corresponding G-IV mission. Figure 7-2: P-3 “pre-shear” core-region survey pattern Altitude: 12,000 ft (4 km) altitude preferable. Expendables: Deploy dropsondes at center of first pass, RMW, and 1.2xRMW of Figure-4 legs (if no G-IV, then also at turn points). Deploy dropsondes at turn points (vertices) and mid points of octagonal flight pattern legs. No more than 42 drops needed (25 if G-IV present and second Figure-4 not performed). Pattern: The pattern is flown with respect to the surface storm center. Radial legs of the initial Figure-4 pattern extend to 4.5xRMW, where RMW is the estimated radius of maximum azimuthal-mean tangential wind. For example, if RMW = 18 nm, the maximum radial extent of the pattern is 81 nm. The aircraft then turns inbound and performs a counter-clockwise octagonal circumnavigation at a radius of 2xRMW. If time permits, additional passes may be done from 14’ to 15’, and from 16’ to FP’. Instrumentation: Set airborne Doppler radar to scan F/AST on all legs. Tropical Cyclone in Shear Experiment
HFP_2013.docx