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Three-dimensional airborne Doppler analyses at HRD

This project aims to develop a real-time hurricane wind field analysis using three-dimensional Doppler analyses and variational analysis techniques. The goal is to provide reliable observations for assimilation testing in numerical simulations and make derived products available to hurricane specialists.

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Three-dimensional airborne Doppler analyses at HRD

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

  2. 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.

  3. 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

  4. “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

  5. Doppler Radial Velocity Hurricane Humberto 232842 UTC 23 Sep 2001

  6. 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

  7. Wind speed in m/s at 1-km altitude

  8. Radial wind in m/s along outbound flight leg

  9. Wind speed in m/s along outbound flight leg

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