Journal Article10.1007/S00376-009-8091-X
Mesoscale vortex generation and merging process: A case study associated with a post-landfall tropical depression
TL;DR: In this article, the mesoscale vortex generation and merging process appeared to be essential for a tropical depression-related heavy rain event in Shanghai, China, where the meso-vortices developed gradually, also from the lower to the upper levels, as a result of positive horizontal PV advection and diabatic heating effects.
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Abstract: An observational analysis of satellite blackbody temperature (TBB) data and radar images suggests that the mesoscale vortex generation and merging process appeared to be essential for a tropical-depression-related heavy rain event in Shanghai, China. A numerical simulation reproduced the observed mesoscale vortex generation and merging process and the corresponding rain pattern, and then the model outputs were used to study the related dynamics through diagnosing the potential vorticity (PV) equation. The tropical depression (TD) was found to weaken first at lower levels and then at upper levels due to negative horizontal PV advection and diabatic heating effects. The meso-vortices developed gradually, also from the lower to the upper levels, as a result of positive horizontal PV advection and diabatic heating effects in the downshear left quadrant of the TD. One of these newly-generated vortices, V1, replaced the TD ultimately, while the other two, V2 and V3, merged due to the horizontal PV advection process. Together with the redevelopment of V1, the merging of V2 and V3 triggered the very heavy rain in Shanghai.
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Citations
Rainfall Distribution in Landfalling Tropical Cyclones
Zifeng Yu,Yuqing Wang +1 more
- 29 Aug 2018
TL;DR: In this article, the authors describe the rainfall distribution in LTCs, including both axisymmetric and asymmetric distributions and their major controlling parameters, such as environmental vertical wind shear, TC intensity and motion, and coastline.
Understanding the vertical structure of potential vorticity in tropical depressions
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The Relationship Between the Inner‐Core Size and the Rainfall Distribution in Landfalling Tropical Cyclones Over China
TL;DR: In this paper , the relationship between the inner core size and rainfall distribution in landfalling TCs is studied and it is found that small TCs have higher rain rate with higher axisymmetry than large TCs.
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Rainfall forecast errors in different landfall stages of Super Typhoon Lekima (2019)
TL;DR: In this paper, the rainfall forecast performance of the TC version of the Global and Regional Assimilation PrEdiction System (GRAPES-TCM) for landfalling Super Typhoon Lekima (2019) is studied by using the object-oriented verification method of contiguous rain area (CRA).
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