GVTD-X is a numerical method to retrieve tangential and radial wind components in atmospheric vortices from single-Doppler radar observations, which is named from pronounciation of a abbreviation "GVTD-HeCs" (Generalized Velocity Track Display with the Helmholtz-decomposition-based Closure assumption). The retrieval method is implemented by Fortran. You can use it by linking the static library libGVTDX.a.
- Introducing asymmetric radial wind components in the closure assumption
- Accurate wind retrievals for atmospheric vortices with asymmetric tangential and radial wind components
- Insensitive of the retrieved axisymmetric winds to errors of the vortex-center estimation, compared with GBVTD and GVTD
- Simultaneously solving the retrieval equations for entire radii
- Radial consistency of the asymmetric winds even in potential radial gaps due to insufficient sampling in the azimuth
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Tsujino, S., T. Horinouchi, and U. Shimada, 2024: A New Closure Assumption and Formulation Based on the Helmholtz Decomposition for Improving Retrievals for Vortex Circulations from Single-Doppler Radar Observations. Mon. Wea. Rev., 152, 145–168, https://doi.org/10.1175/MWR-D-23-0043.1 (preprint)
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日本語による手法の定式化とその導出: Formulation and derivation (Japanese document)
- Validation with dual-Doppler analysis
- Development of objective methods to find the vortex center
- Application to various vortices and cases
- Dynamical analyses by using this method