Name
Title | ||
|---|---|---|
Aircraft and Satellite Observations of Vortex Evolution and Surface Wind Asymmetry of Concentric Eyewalls in Hurricane Irma |
Abstract | ||
|---|---|---|
We compare the vortex evolutions of eyewall replacement cycles (ERCs) between the sea-surface and the free-atmosphere levels and investigate the asymmetric structure of concentric eyewalls (CEs) by examining a combination of aircraft observations and surface wind fields derived from C-band spaceborne synthetic aperture radar (SAR) images during Hurricane Irma (2017) from 4 September 2017 to 8 September 2017. A total of 116 radial wind profiles measured by an aircraft were collected and showed that ERCs occur at both the sea-surface and the free-atmosphere levels. The outer eyewall was shown to form at the free atmospheric level (similar to 3 km) with a narrow structure at the sea-surface level and an outward tilt with height in the cross-section. In our study, four ERC events were determined from wind profile parameters fitted by a modified Rankine vortex model, which was validated by 328 radial legs collected from six hurricanes. The outer eyewall did not replace the inner eyewall at the sea-surface level in the third ERC, due to the maintenance of a short duration and intense original eyewall. Additionally, Irma's intensity weakened during the fourth ERC rather than re-intensified, because of the generation of a third wind maximum outside the secondary eyewall. Comparisons of five SAR-derived surface wind fields in Irma and another two hurricane cases illustrated that the location of the secondary eyewall generation is a key point in the interpretation of anomaly intensity changes in the fourth ERC. |
Year | DOI | Venue |
|---|---|---|
2022 | 10.3390/rs14092158 | REMOTE SENSING |
Keywords | DocType | Volume |
concentric eyewalls, eyewall replacement circle, surface wind asymmetry, synthetic aperture radar | Journal | 14 |
Issue | ISSN | Citations |
9 | 2072-4292 | 0 |
PageRank | References | Authors |
0.34 | 0 | 6 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Han Hua | 1 | 0 | 0.34 |
| Biao Zhang | 2 | 97 | 23.66 |
| Guosheng Zhang | 3 | 0 | 0.68 |
| William Perrie | 4 | 105 | 27.21 |
| Zhifeng Chen | 5 | 0 | 0.68 |
| Yuanben Li | 6 | 0 | 0.34 |