Rapid intensification of Typhoon Hato (2017) over shallow water

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

5 Scopus Citations
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  • Iam-Fei Pun
  • I. I. Lin
  • Kelvin T.F. Chan
  • James F. Price
  • Dong Shan Ko
  • Chun-Chi Lien
  • Yu-Lun Wu
  • Hsiao-Ching Huang


Original languageEnglish
Article number3709
Journal / PublicationSustainability (Switzerland)
Issue number13
Online published6 Jul 2019
Publication statusPublished - Jul 2019



On 23 August, 2017, Typhoon Hato rapidly intensified by 10 kt within 3 h just prior to landfall in the city of Macau along the South China coast. Hato's surface winds in excess of 50 m s-1 devastated the city, causing unprecedented damage and social impact. This study reveals that anomalously warm ocean conditions in the nearshore shallow water (depth < 30 m) likely played a key role in Hato's fast intensification. In particular, cooling of the sea surface temperature (SST) generated by Hato at the critical landfall point was estimated to be only 0.1-0.5 °C. The results from both a simple ocean mixing scheme and full dynamical ocean model indicate that SST cooling was minimized in the shallow coastal waters due to a lack of cool water at depth. Given the nearly invariant SST in the coastal waters, we estimate a large amount of heat flux, i.e., 1.9kWm-2, during the landfall period. Experiments indicate that in the absence of shallow bathymetry, and thus, if nominal cool water had been available for vertical mixing, the SST cooling would have been enhanced from 0.1 °C to 1.4 °C, and sea to air heat flux reduced by about a quarter. Numerical simulations with an atmospheric model suggest that the intensity of Hato was very sensitive to air-sea heat flux in the coastal region, indicating the critical importance of coastal ocean hydrography.

Research Area(s)

  • Rapid intensification, Shallow water, SST cooling, Typhoon, Vertical mixing

Citation Format(s)

Rapid intensification of Typhoon Hato (2017) over shallow water. / Pun, Iam-Fei; Chan, Johnny C.L.; Lin, I. I.; Chan, Kelvin T.F.; Price, James F.; Ko, Dong Shan; Lien, Chun-Chi; Wu, Yu-Lun; Huang, Hsiao-Ching.

In: Sustainability (Switzerland), Vol. 11, No. 13, 3709, 07.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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