Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 23, Pages 8547-8553Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL061281
Keywords
Supertyphoon; Haiyan; Global Warming; Hiatus
Categories
Funding
- Ministry of Science and Technology (MOST), Taiwan
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With the extra-ordinary intensity of 170 kts, supertyphoon Haiyan devastated the Philippines in November 2013. This intensity is among the highest ever observed for tropical cyclones (TCs) globally, 35 kts well above the threshold (135kts) of the existing highest category of 5. Though there is speculation to associate global warming with such intensity, existing research indicate that we have been in a warming hiatus period, with the hiatus attributed to the La Nina-like multi-decadal phenomenon. It is thus intriguing to understand why Haiyan can occur during hiatus. It is suggested that as the western Pacific manifestation of the La Nina-like phenomenon is to pile up warm subsurface water to the west, the western North Pacific experienced evident subsurface warming and created a very favorable ocean pre-condition for Haiyan. Together with its fast traveling speed, the air-sea flux supply was 158% as compared to normal for intensification.
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