Impact of Vertical Wind Shear on Asymmetry of Stratospheric Gravity Waves Generated by Tropical Cyclones.
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| Title: | Impact of Vertical Wind Shear on Asymmetry of Stratospheric Gravity Waves Generated by Tropical Cyclones. |
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| Authors: | Wang, Xu1,2 (AUTHOR), Wang, Yuan1,2,3 (AUTHOR) wangyuan19@nudt.edu.cn, Zhang, Lifeng2 (AUTHOR), Zhang, Yun2 (AUTHOR), Guan, Jiping2 (AUTHOR) |
| Source: | Journal of the Atmospheric Sciences. Feb2026, Vol. 83 Issue 2, p181-198. 18p. |
| Subjects: | Vertical wind shear, Gravity waves, Stratosphere, Tropical cyclones, Atmospheric physics, Theory of wave motion, Computer simulation, Symmetry |
| Abstract: | This study focused on the impact of vertical wind shear (VWS) in the stratosphere on the asymmetry of stratospheric gravity waves (SGWs) generated by tropical cyclones (TCs), based on a set of numerical simulations of TC-SGWs completed under different stratospheric background wind conditions. Results showed that a constant background easterly wind leads to a slightly asymmetric distribution of TC-SGWs, with intense waves in the lower stratosphere located on the upwind side, attributable to the asymmetry in TC structure under the condition of the easterly wind. In contrast, VWS induces a notable asymmetric distribution of TC-SGWs through directional critical levels. Spectral and wavenumber–vector analyses revealed that the co-occurrence of radial and tangential propagation of TC-SGWs modifies the critical-level filtering effect, producing a final distribution with intense waves located mainly in the southeastern quadrant relative to a TC center and to a lesser extent in the northeastern and southwestern quadrants, rather than throughout the eastern quadrants as a whole. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | This study focused on the impact of vertical wind shear (VWS) in the stratosphere on the asymmetry of stratospheric gravity waves (SGWs) generated by tropical cyclones (TCs), based on a set of numerical simulations of TC-SGWs completed under different stratospheric background wind conditions. Results showed that a constant background easterly wind leads to a slightly asymmetric distribution of TC-SGWs, with intense waves in the lower stratosphere located on the upwind side, attributable to the asymmetry in TC structure under the condition of the easterly wind. In contrast, VWS induces a notable asymmetric distribution of TC-SGWs through directional critical levels. Spectral and wavenumber–vector analyses revealed that the co-occurrence of radial and tangential propagation of TC-SGWs modifies the critical-level filtering effect, producing a final distribution with intense waves located mainly in the southeastern quadrant relative to a TC center and to a lesser extent in the northeastern and southwestern quadrants, rather than throughout the eastern quadrants as a whole. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00224928 |
| DOI: | 10.1175/JAS-D-24-0154.1 |
