Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shear
Abstract Vertical wind shear (VWS), as an important dynamic factor influencing tropical cyclone rainfall (TCR), has a remarkable diurnal cycle of variation over the East Asia–western North Pacific region. The magnitude of tropical cyclone (TC)‐experienced VWS has enhanced amplitude but different pha...
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Wiley
2025-01-01
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| Series: | Atmospheric Science Letters |
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| Online Access: | https://doi.org/10.1002/asl.1281 |
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| author | Na Wei Qian Wang Xinghai Zhang Dajun Zhao |
| author_facet | Na Wei Qian Wang Xinghai Zhang Dajun Zhao |
| author_sort | Na Wei |
| collection | DOAJ |
| description | Abstract Vertical wind shear (VWS), as an important dynamic factor influencing tropical cyclone rainfall (TCR), has a remarkable diurnal cycle of variation over the East Asia–western North Pacific region. The magnitude of tropical cyclone (TC)‐experienced VWS has enhanced amplitude but different phases over the South China Sea (SCS) and coastal East China (CEC) compared with that over the open ocean. Diurnal variation in TCR over the SCS shows statistically significant correlation with that of VWS. The convection concentrated in the downshear‐left quadrant strengthens markedly when VWS becomes large, thereby delaying the peak rainfall in the inner core of the TC and enhancing the amplitude of the diurnal cycle of TCR at ~09 local standard time. Over CEC, the diurnal signal of TCR is very weak but statistically significant in the downshear‐left and upshear‐right quadrants with opposite phase, illustrating the change in asymmetry of the spatial distribution of TCR induced by the large VWS diurnal cycle. The findings of this study could provide reference for improved forecasting of TCR on the fine temporal scale. |
| format | Article |
| id | doaj-art-cc738588a32e4a27ac7d6fc4e61b2eaf |
| institution | Kabale University |
| issn | 1530-261X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
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| series | Atmospheric Science Letters |
| spelling | doaj-art-cc738588a32e4a27ac7d6fc4e61b2eaf2025-01-29T09:47:21ZengWileyAtmospheric Science Letters1530-261X2025-01-01261n/an/a10.1002/asl.1281Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shearNa Wei0Qian Wang1Xinghai Zhang2Dajun Zhao3Nanjing Joint Institute for Atmospheric Sciences Nanjing ChinaState Key Laboratory of Severe Weather in Chinese Academy of Meteorological Sciences Beijing ChinaChina Electronic Technology Group Corporation, Glarun Group Co., Ltd. Nanjing ChinaState Key Laboratory of Severe Weather in Chinese Academy of Meteorological Sciences Beijing ChinaAbstract Vertical wind shear (VWS), as an important dynamic factor influencing tropical cyclone rainfall (TCR), has a remarkable diurnal cycle of variation over the East Asia–western North Pacific region. The magnitude of tropical cyclone (TC)‐experienced VWS has enhanced amplitude but different phases over the South China Sea (SCS) and coastal East China (CEC) compared with that over the open ocean. Diurnal variation in TCR over the SCS shows statistically significant correlation with that of VWS. The convection concentrated in the downshear‐left quadrant strengthens markedly when VWS becomes large, thereby delaying the peak rainfall in the inner core of the TC and enhancing the amplitude of the diurnal cycle of TCR at ~09 local standard time. Over CEC, the diurnal signal of TCR is very weak but statistically significant in the downshear‐left and upshear‐right quadrants with opposite phase, illustrating the change in asymmetry of the spatial distribution of TCR induced by the large VWS diurnal cycle. The findings of this study could provide reference for improved forecasting of TCR on the fine temporal scale.https://doi.org/10.1002/asl.1281diurnal cycleSouth China Seatropical cyclone rainfallvertical wind shear |
| spellingShingle | Na Wei Qian Wang Xinghai Zhang Dajun Zhao Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shear Atmospheric Science Letters diurnal cycle South China Sea tropical cyclone rainfall vertical wind shear |
| title | Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shear |
| title_full | Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shear |
| title_fullStr | Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shear |
| title_full_unstemmed | Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shear |
| title_short | Modulation of diurnal variation in rainfall associated with tropical cyclones over the East Asia–Western North Pacific region by environmental vertical wind shear |
| title_sort | modulation of diurnal variation in rainfall associated with tropical cyclones over the east asia western north pacific region by environmental vertical wind shear |
| topic | diurnal cycle South China Sea tropical cyclone rainfall vertical wind shear |
| url | https://doi.org/10.1002/asl.1281 |
| work_keys_str_mv | AT nawei modulationofdiurnalvariationinrainfallassociatedwithtropicalcyclonesovertheeastasiawesternnorthpacificregionbyenvironmentalverticalwindshear AT qianwang modulationofdiurnalvariationinrainfallassociatedwithtropicalcyclonesovertheeastasiawesternnorthpacificregionbyenvironmentalverticalwindshear AT xinghaizhang modulationofdiurnalvariationinrainfallassociatedwithtropicalcyclonesovertheeastasiawesternnorthpacificregionbyenvironmentalverticalwindshear AT dajunzhao modulationofdiurnalvariationinrainfallassociatedwithtropicalcyclonesovertheeastasiawesternnorthpacificregionbyenvironmentalverticalwindshear |