Quantification of the downstream impact of extratropical transition for Typhoon Jangmi and other case studies
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The impact of tropical cyclones (TCs) on the midlatitude flow during extratropical transition (ET) is investigated in five realistic case studies using a TC removal technique based on potential vorticity (PV) inversion. The detailed study of Typhoon Jangmi (2008) reveals the diabatically enhanced net transport of low-PV air to the tropopause as a key processes that determines the direct impact of ET. This physical process is common for all case studies. Relocation experiments for Jangmi and four other case studies show the crucial role of the relative position of the TC and the midlatitude flow for the downstream impact of ET and the reduced predictability during ET.