A tale of two rapidly intensifying supertyphoons: Hagibis (2019) and haiyan (2013)
Journal
Bulletin of the American Meteorological Society
Journal Volume
102
Journal Issue
9
Pages
E1645-E1664
Date Issued
2021
Author(s)
Lin I.-I
Abstract
Devastating Japan in October 2019, Supertyphoon (STY) Hagibis was an important typhoon in the history of the Pacific. A striking feature of Hagibis was its explosive rapid intensification (RI). In 24 h, Hagibis intensified by 100 knots (kt; 1 kt ? 0.51 m s-1), making it one of the fastest-intensifying typhoons ever observed. After RI, Hagibis's intensification stalled. Using the current typhoon intensity record holder, i.e., STY Haiyan (2013), as a benchmark, this work explores the intensity evolution differences of these two high-impact STYs. We found that the extremely high prestorm sea surface temperature reaching 30.5°C, deep/warm prestorm ocean heat content reaching 160 kJ cm-2, fast forward storm motion of ?8 m s-1, small during-storm ocean cooling effect of ?0.5°C, significant thunderstorm activity at its center, and rapid eyewall contraction were all important contributors to Hagibis's impressive intensification. There was 36% more air-sea flux for Hagibis's RI than for Haiyan's. After its spectacular RI, Hagibis's intensification stopped, despite favorable environments. Haiyan, by contrast, continued to intensify, reaching its record-breaking intensity of 170 kt. A key finding here is the multiple pathways that storm size affected the intensity evolution for both typhoons. After RI, Hagibis experienced a major size expansion, becoming the largest typhoon on record in the Pacific. This size enlargement, combined with a reduction in storm translational speed, induced stronger ocean cooling that reduced ocean flux and hindered intensification. The large storm size also contributed to slower eyewall replacement cycles (ERCs), which prolonged the negative impact of the ERC on intensification. ? 2021 American Meteorological Society.
Subjects
Air-sea interaction
Atmosphere-ocean interaction
Hurricanes/typhoons
Sea surface temperature
Tropical cyclones
Atmospheric thermodynamics
Hurricanes
Oceanography
Storms
Submarine geophysics
Surface properties
Surface waters
'current
Air sea interactions
Atmosphere-ocean interactions
Eyewall
Rapid intensification
Replacement cycles
Storm sizes
Tropical cyclone
Typhoon intensities
Atmospheric temperature
Type
journal article