Three-dimensional airborne Doppler analyses at HRD John Gamache, Wen-Chau Lee, Peter Dodge, Frank Marks, Nancy Griffin, Joe Griffin Three-dimensional variational analysis Real-time quality control and de-aliasing

Variational Analysis--Minimize the following simultaneously: The difference between the projection of wind analysis on the Doppler radials and the original Doppler radial velocities. The three-dimensional mass divergence (analestic approximation). Second derivative in all three directions, as well as cross derivatives. This is a smoother and should be given a very light weight. Difference between prescribed vertical wind at vertical boundaries (usually zero), and wind-analysis vertical wind.

Joint Hurricane Testbed “Real-Time Doppler” Project Goals Develop a hurricane wind-field analysis in “real time” and make products derived from it available to hurricane specialists at the Tropical Prediction Center via SATCOM Send reliable observations via SATCOM to the Environmental Modeling Center at NCEP for assimilation testing in numerical simulations. Main goal is to ingest the observations in the HWRF model

“Real-Time” 2004 Accomplishments Sea-surface reflection removal software developed Speckle removal developed Minor bugs in HRD implementation of Bargen-Brown de-aliasing removed Two-dimensional de-aliasing scheme development begun Three-dimensional wind fields and vertical profiles produced in real time in Hurricane Ivan (2004) File of “cleaned up” de-aliased radials produced

Doppler Radial Velocity Hurricane Humberto 232842 UTC 23 Sep 2001

Comparison of Analyses Created from Research-Quality and Automatically Edited Data At 1 km level in Hurricane Humberto 2330 UTC on 23 September 2001 Research Quality Automatic

Wind speed in m/s at 1-km altitude

Radial wind in m/s along outbound flight leg

Wind speed in m/s along outbound flight leg