Typhoon induced summer cold shock advected by Kuroshio off eastern Taiwan

Yi Chun Kuo, Zhe Wen Zheng, Quanan Zheng, Ganesh Gopalakrishnan, Chia Ying Lee, Shi We Chern, Yan Hao Chao

Research output: Contribution to journalArticle

Abstract

In this study, we used satellite observations, in-situ measurements, and numerical modelling to investigate an extreme temperature change triggered by a typhoon in the ocean near the Kuroshio region off eastern Taiwan. With the westward passage of Typhoon Morakot in 2009 through Taiwan, a distinct cool wake was generated at the southeastern corner of Taiwan (CWSET) and moved towards the downstream Kuroshio region; it involved a precipitous cooling of at least 4 °C within 10–20 km of the coast. Rapid and drastic temperature drops triggered by the CWSET and advected by the strong conveyor belt effect of the Kuroshio Current are highly probable sources of cold shocks in summer. We clarified the mechanism that generated the CWSET through a series of sensitivity experiments using the Regional Oceanic Modeling System. The cold shock was mainly triggered by local wind stress associated with the typhoon. In addition, the Kuroshio Current was demonstrated to have played a crucial role in both the generation of upwelling off the southeastern coast of Taiwan during the passage of the typhoon and the transporting of this impact downstream. This process was verified through a systematic analysis of all typhoons moving westward through Taiwan from 2005 to 2013. Cold-shock stress is thought to be linked with naturally occurring ‘fish kills’, and obtaining a more thorough understanding of the CWSET will be helpful for protecting aquaculture off the eastern coast of Taiwan from the impacts of cold shocks triggered by typhoons moving westward through Taiwan in summer.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalOcean Modelling
Volume109
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • Kuroshio
  • Numerical simulations
  • Sea surface temperature
  • Typhoons

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Oceanography
  • Geotechnical Engineering and Engineering Geology
  • Atmospheric Science

Fingerprint Dive into the research topics of 'Typhoon induced summer cold shock advected by Kuroshio off eastern Taiwan'. Together they form a unique fingerprint.

  • Cite this

    Kuo, Y. C., Zheng, Z. W., Zheng, Q., Gopalakrishnan, G., Lee, C. Y., Chern, S. W., & Chao, Y. H. (2017). Typhoon induced summer cold shock advected by Kuroshio off eastern Taiwan. Ocean Modelling, 109, 1-10. https://doi.org/10.1016/j.ocemod.2016.11.003