The influence of environments on the intensity change of typhoon soudelor

Leo Oey, Yuchen Lin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Previous studies have shown that background oceanic and atmospheric environments can influence not only the formation but also the intensity of tropical cyclones. Typhoon Soudelor in August 2015 is notable in that it underwent two rapid intensifications as the storm passed over the Philippine Sea where the 26 C isotherm (Z26 ) was deeper than 100 m and warm eddies abounded. At the same time, prior to the storm’s arrival, an anomalous upper-level anticyclone developed south of Japan and created a weakened vertical wind shear (Vs ) environment that extended into the Philippine Sea. This study examines how the rapid intensification of Typhoon Soudelor may be related to the observed variations of Z26, Vs and other environmental fields as the storm crossed over them. A regression analysis indicates that the contribution to Soudelor’s intensity variation from Vs is the largest (62%), followed by Z26 (27%) and others. Further analyses using composites then indicate that the weak vertical wind shear produced by the aforementioned anomalous anticyclone is a robust feature in the western North Pacific during the developing summer of strong El Ninos with Oceanic Nino Index (ONI) > 1.5.

Original languageEnglish
Article number162
Pages (from-to)1-15
Number of pages15
JournalAtmosphere
Volume12
Issue number2
DOIs
StatePublished - Feb 2021

Keywords

  • 26 C isotherm
  • El Nino
  • Philippine Sea
  • Tropical cyclones
  • Typhoon rapid intensification
  • Upper-ocean warm eddies
  • Upper-tropospheric anticyclone
  • Vertical wind shear
  • Western North Pacific

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