Preprints
https://doi.org/10.5194/amt-2020-240
https://doi.org/10.5194/amt-2020-240

  22 Jul 2020

22 Jul 2020

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Comparison of Single Doppler and Multiple Doppler Wind Retrievals in Hurricane Matthew (2016)

Ting-Yu Cha and Michael M. Bell Ting-Yu Cha and Michael M. Bell
  • Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA

Abstract. Hurricane Matthew (2016) was observed by the NEXRAD KAMX polarimetric radar and NOAA P-3 airborne radar near the coast of the southeastern United States for several hours, providing a novel opportunity to evaluate and compare single and multiple Doppler wind retrieval techniques for tropical cyclone flows. The generalized velocity track display (GVTD) technique can retrieve a subset of the wind field from a single ground-based Doppler radar under the assumption of nearly axisymmetric rotational wind, but is shown to have errors from aliasing of unresolved wind components. An improved technique that mitigates errors due to storm motion is derived in this study, although some spatial aliasing remains due to limited information content from the single Doppler measurements. A spline-based variational wind retrieval technique called SAMURAI can retrieve the full three-dimensional wind field from airborne radar fore-aft pseudo-dual Doppler scanning, but is shown to have errors due to temporal aliasing from the non-simultaneous Doppler measurements. A comparison between the two techniques shows that the axisymmetric tangential winds are generally comparable between the two techniques after the improvements to GVTD retrievals. Fourier decomposition of asymmetric kinematic and convective structure shows more discrepancies due to spatial and temporal aliasing in the retrievals. The advantages and disadvantages of each technique for studying tropical cyclone structure are discussed, and suggest that complementary information can be retrieved from both single and multiple Doppler retrievals. Future improvements to the asymmetric flow assumptions in single Doppler analysis and steady-state assumptions in pseudo-dual Doppler analysis are required to reconcile differences in retrieved tropical cyclone structure.

Ting-Yu Cha and Michael M. Bell

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Ting-Yu Cha and Michael M. Bell

Data sets

data for amt-2020-240 Ting-Yu Cha https://doi.org/10.5281/zenodo.3899262

Model code and software

nsf-lrose/lrose-blaze: lrose-blaze-20190105 Michael M. Bell https://doi.org/10.5281/zenodo.2532758

Ting-Yu Cha and Michael M. Bell

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Short summary
Doppler radar provides high-resolution wind measurements within tropical cyclones (TCs) for real-time monitoring and weather forecasting. Hurricane Matthew (2016) was observed by the ground-based single Doppler and NOAA P-3 Hurricane Hunter airborne radar simultaneously, providing a novel opportunity to compare single and multiple Doppler wind retrieval techniques. Here we improve the single Doppler wind retrieval algorithm, and show the pros and cons of each technique for studying TC structure.