Atmospheric Sciences Seminar
May 4, 3:30 p.m. – 4:30 p.m
Mānoa Campus, Virtual Meeting
1. Change in translational velocity of tropical cyclones (TC) in the South China Sea and impact on TC intensity change
2. The Explosive Intensification of Super Typhoon Hagibis (2019)
Professor II Lin
Institute for Atmospheric Sciences
national taiwanese university
You are invited to our weekly online atmospheric science seminars in spring 2022 via zoom meeting.
When: May 4, 2022 at 3:30 p.m. HST
Meeting Entry: 3:15 p.m. HST
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This lecture covers 2 topics. The first is a climate-scale study that discusses the change in the translational velocity of tropical cyclones in the South China Sea over the past 20 years. Although Kossin in 2018 suggested a global slowdown in TC translation speed since 1950, TC translation speed over the South China Sea (SCS) has actually increased by 43% over the past two decades (from 1998). We found that this translational rate increase may have positively contributed to the observed increase in TC intensity in the SCS, via an increase in air-sea fluxes associated with the TC-induced suppression of ocean cooling due to the translational rate increase .
The 2nd topic is a weather-scaled study of the explosive intensification of Super Typhoon Hagibis (2019). TC Hagibis is one of the highest impact TCs in the western North Pacific. It severely damaged Japan (including Tokyo) in October 2019, the associated economic damage is US$15 billion. One of the most notable features is Hagibis’ “explosive” intensification. Within 24 hours it intensified from a tropical storm to Category “6” intensity (60-160 knots). This talk will discuss this impressive intensification from the perspective of the ocean, atmosphere and TC structure. The subsequent intensification evolution of Hagibis is also discussed.
Chang, Ya-Ting, Lin, II, Huang, Hsiao-Ching, Liao, Yi-Chun, and Lien, Chun-Chi, The Association of Typhoon Intensity Allowance with Translation Speed Improvement in the South China Sea, Sustainability, 12( 3), doi:10.3390/su12030939, 2020.
Kosin, JP A global slowdown in tropical cyclone translation speed. Nature 2018, 558, 104–107, 2018.
Lin, II, Pun, I.-F. and Lien, C.-C., ‘Category-6’ Supertyphoon Haiyan in Global Warming Hiatus: Contribution from Subsurface Ocean Warming, Geophys. Resolution Lett., 41, doi:10.1002/2014GL061281, 2014.
Lin II Rogers Robert F Huang Hsiao Ching Liao Yi Chun Herndon Derrick Yu Jin Yi Chang Ya Ting Zhang Jun A Patricola Christina M Pun, Iam-Fei, Lien, Chun-Chi, A Tale of Two Rapid-Intensifying Supertyphoons: Hagibis (2019) and Haiyan (2013), BAMS, 102, 9, E1645-E1664, doi: 10.1175/BAMS-D-20 -0223.1, 2021.
SOEST Atmospheric Sciences, Mānoa Campus
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