Three-dimensional airborne Doppler analyses at HRD

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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

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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.

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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

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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

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Doppler Radial Velocity
Hurricane Humberto 232842 UTC 23 Sep 2001
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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
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Wind speed in m/s at 1-km altitude
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Radial wind in m/s along outbound flight leg
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Wind speed in m/s along outbound flight leg
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