Introduction of GVTD-X

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.

Features (Updates from previous methods)

• 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

References

• 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)

• Method descriptions

• 日本語による手法の定式化とその導出: Formulation and derivation (Japanese document)

Images

USAGE

Install

How to use and examples

Demo

Future works

• 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

Cite as

The above DOI corresponds to the latest versioned release as published to Zenodo, where you will find all earlier releases. To cite ro-crate-py independent of version, use https://doi.org/10.5281/zenodo.17490992, which will always redirect to the latest release.