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Journal of Oceanography

, Volume 75, Issue 1, pp 1–21 | Cite as

Typhoon-induced ocean subsurface variations from glider data in the Kuroshio region adjacent to Taiwan

  • Po-Chun Hsu
  • Chung-Ru HoEmail author
Original Article
  • 255 Downloads

Abstract

Underwater gliders are used to investigate the variations on the ocean surface and subsurface during the 14 typhoons that passed over the Kuroshio region near Taiwan in 2010–2013. Typhoon-induced subsurface layer warming, which was formed on the basis of the heat pump effect of the vertical mixing process, is observed in this study. In addition, the gliders observe the variations in salinity during the passage of the typhoons. Typhoons, accompanied by heavy rainfall, introduce a considerable amount of fresh water into the upper ocean, diluting the surface salinity. The diluted salinity accompanied deepening of the mixed layer which moved downward to the subsurface by vertical mixing, supplying fresh water to both the surface and subsurface layers. Additionally, because of vertical mixing, maximum temperature variations occur at the bottom of the mixed layer or at a level deeper than the mixed layer. Changes of the heat content show that a series of vertical mixing events occurs in the upper ocean. Pairs of salinity profiles indicate comprehensive vertical mixing in the upper ocean and yield schematics to compare typhoons with or without heavy rainfall. Higher sustained wind speeds may contribute to a considerable drop in sea surface temperature, but possibly not to the magnitude of the subsurface warming. The upper ocean thermocline gradient before a typhoon is an important factor to determine the magnitude of subsurface warming. This study concludes a glider observational result that typhoons cause subsurface layer warming and freshening in the Kuroshio region near Taiwan.

Keywords

Glider Kuroshio Typhoon Temperature Salinity Subsurface layer 

Notes

Acknowledgements

The authors thank the World Ocean Database of the National Oceanographic Data Center providing the glider cruise measurements data. SSM/I, TMI, AMSR-E, and Windsat data are provided by the Remote Sensing System, which is a scientific research company and supported by NASA and NOAA. We also appreciate the Editor-in-chief and anonymous reviewers for providing constructive comments and suggestions. This work was supported by the Ministry of Science and Technology of Taiwan through Grants MOST 105-2611-M-019-001, MOST 106-2917-I-019-001, and MOST 106-2611-M-019-015.

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Copyright information

© The Oceanographic Society of Japan and Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Marine Environmental InformaticsNational Taiwan Ocean UniversityKeelungTaiwan
  2. 2.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwaJapan

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