Intensity Change of Binary Tropical Cyclones (TCs) in Idealized Numerical Simulations: Two Initially Identical Mature TCs
| العنوان: | Intensity Change of Binary Tropical Cyclones (TCs) in Idealized Numerical Simulations: Two Initially Identical Mature TCs |
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| المؤلفون: | Jian-Feng Gu, Yuqing Wang, Hao-Yan Liu |
| المصدر: | Journal of the Atmospheric Sciences. 78:1001-1020 |
| بيانات النشر: | American Meteorological Society, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Physics, Atmospheric Science, Critical distance, 010504 meteorology & atmospheric sciences, Advection, Rossby radius of deformation, Inner core, Geometry, 01 natural sciences, 010305 fluids & plasmas, Anticyclone, Wind shear, 0103 physical sciences, Potential temperature, Intensity (heat transfer), 0105 earth and related environmental sciences |
| الوصف: | This study investigates the intensity change of binary tropical cyclones (TCs) in idealized cloud-resolving simulations. Four simulations of binary interaction between two initially identical mature TCs of about 70 m s−1 with initial separation distance varying from 480 to 840 km are conducted in a quiescent f-plane environment. Results show that two identical TCs finally merge if their initial separation distance is within 600 km. The binary TCs presents two weakening stages (stages 1 and 3) with a quasi-steady evolution (stage 2) in between. Such intensity change of one TC is correlated with the upper-layer vertical wind shear (VWS) associated with the upper-level anticyclone (ULA) of the other TC. The potential temperature budget shows that eddy radial advection of potential temperature induced by large upper-layer VWS contributes to the weakening of the upper-level warm core and thereby the weakening of binary TCs in stage 1. In stage 2, the upper-layer VWS first weakens and then restrengthens with relatively weak magnitude, leading to a quasi-steady intensity evolution. In stage 3, due to the increasing upper-layer VWS, the nonmerging binary TCs weaken again until their separation distance exceeds the local Rossby radius of deformation of the ULA (about 1600 km), which can serve as a dynamical critical distance within which direct interaction can occur between two TCs. In the merging cases, the binary TCs weaken prior to merging because highly asymmetric structure develops as a result of strong horizontal deformation of the inner core. However, the merged system intensifies shortly after merging. |
| تدمد: | 1520-0469 0022-4928 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::e6e5511c4c360568b7e3311ff76bd354Test https://doi.org/10.1175/jas-d-20-0116.1Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi...........e6e5511c4c360568b7e3311ff76bd354 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15200469 00224928 |
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