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- W4255983758 abstract "Abstract. Idealised simulations of Shapiro-Keyser cyclones developing a sting jet (SJ) are presented. Thanks to an improved and accurate implementation of thermal wind balance in the initial state, it has been possible to use more realistic environments than in previous idealised studies. As a consequence, this study provides further insight in SJ evolution and dynamics and explores SJ robustness to different environmental conditions, assessed via a wide and different range of sensitivity experiments. The control simulation contains a cyclone that fits the Shapiro-Keyser conceptual model and develops a SJ whose dynamics are associated with the evolution of mesoscale instabilities including symmetric instability (SI) along the airstream. The SJ undergoes a strong descent while leaving the cloud-head banded tip and markedly accelerating towards the frontal-fracture region, revealed as an area of buckling of the already-sloped moist isentropes. A substantial amount of SI, generated by slantwise frontal motions in the cloud head, is released along the SJ during its descent. This supports the role of SI in the airstream’s dynamics proposed in a conceptual model outlined in a previous study. Sensitivity experiments illustrate that the SJ is a robust feature of intense Shapiro-Keyser cyclones, highlighting a range of different environmental conditions in which SI contributes to the evolution of this airstream, conditional on the model having adequate resolution. The results reveal that several environmental factors can modulate the strength of the SJ. However, a positive relationship between the strength of the SJ, both in terms of peak speed and amount of descent, and the amount of instability occurring along it can still be identified. In summary, the idealised simulations presented in this study show the robustness of SJ occurrence in intense Shapiro-Keyser cyclones and support and clarify the role of dry instabilities in SJ dynamics." @default.
- W4255983758 created "2022-05-12" @default.
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- W4255983758 date "2019-10-01" @default.
- W4255983758 modified "2023-10-14" @default.
- W4255983758 title "Idealised simulations of cyclones with robust symmetrically-unstable sting jets" @default.
- W4255983758 doi "https://doi.org/10.5194/wcd-2019-8" @default.
- W4255983758 hasPublicationYear "2019" @default.
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