Group
King Heng LAU
Research Interests:
- Physics and dynamics of tropical cyclones
- Future predictability and variability of tropical cyclones under climate change
Research Projects:
(All figures below are subject to copyright, and are allowed to be used only with permission from the owner.)
Numerical Investigation of the Eyewall Evolution in Landfalling Tropical Cyclones (TCs)
This project is supervised by Prof. Chun-Chieh Wu at the National Taiwan University Typhoon Dynamics Research Center as part of a (remote) summer research visit.
The study aims to investigate the eyewall evolution of Typhoon Mangkhut through numerical simulations using the Weather Research and Forecasting Model (WRF). Mangkhut’s eyewall contracted before landfall over Luzon, broke down after landfall, and a much larger eyewall formed as Mangkhut re-entered the ocean (Fig. 1). Similar phenomena have already been observed in historical TCs making landfall over Luzon. Examples include TC Zeb (1998) [1] and TC Megi (2010) [2].
The role of terrain, land surfaces, and ocean on the observed eyewall evolution in Mangkhut will be investigated through carefully designed sensitivity experiments. It is hoped that research results will lead to better understanding of the effects of land surfaces on the eyewall evolution of TCs, and hopefully improve future intensity forecasts for landfalling TCs.
Fig 1. Radar reflectivity (unit: dBZ) at the lowest model level from 4 September 10:00 UTC to 15 September 08:00 UTC 2018 in two-hourly intervals. The contraction and breakdown of the original eyewall and the formation of a new, much larger eyewall is observed.
[1] Wu, C. C., Cheng, H. J., Wang, Y., & Chou, K. H. (2009). A numerical investigation of the eyewall evolution in a landfalling typhoon. Monthly weather review, 137(1), 21-40.
[2] Wang, H., & Wang, Y. (2021). A Numerical Study of Typhoon Megi (2010). Part II: Eyewall Evolution Crossing the Luzon Island. Monthly Weather Review, 149(2), 375-394.
Publications:
Lui, Y. S., Tse, L. K. S., Tam, C. Y., Lau, K. H., & Chen, J. (2021). Performance of MPAS-A and WRF in predicting and simulating western North Pacific tropical cyclone tracks and intensities. Theoretical and Applied Climatology, 143(1), 505-520.