TITLE:
A Multiscale Energetic Diagnosis of the Response of Mokpo Sea to Typhoon Bolaven
AUTHORS:
Xia Chai, Lin Wang
KEYWORDS:
Typhoon, Yellow Sea, Ocean Response, Air-Sea Interaction, Energetic Diagnose
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.7 No.8,
August
27,
2019
ABSTRACT: The ocean response to typhoon is usually
characterized by a cooling on the sea surface. In August 2012, however, a
warming (instead of cooling) event occurs in the Yellow Sea outside Mokpo,
South Korea, as the typhoon Bolaven (2012) passes. This study gives a brief
introduction to this abnormal sea surface warming. It also provides a multiscale
energetic diagnosis of the oceanic response to Typhoon Bolaven. We used a
recently developed analysis tool named “multiscale window transform” (MWT).
Based on the MWT, we also expanded a localized multiscale energy and vorticity
analysis (MS-EVA). The fields are reconstructed onto three scale windows:
large-scale, abnormal warming-scale, and high
frequency tide-scale windows. The results show that the kinetic energy (KE) in the
abnormal warming-scale window of the Mokpo area is obviously enhanced during
the passage of Bolaven, which can be attributed to three processes: transfer,
transport process of KE and wind stress work. At the same time, the large-scale
window in the Mokpo area experiences barotropic instabilities with KE transfers from large-scale window to warming-scale window. Besides, the strong
wind stress bought by the passage of Bolaven not only inputs a large amount of
KE into warming-scale window, but also causes the increase of KE flux
convergence.