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Marine Geophysical Research

, Volume 40, Issue 4, pp 505–512 | Cite as

El Niño-related sea surface elevation and ocean bottom pressure enhancement associated with the retreat of the Oyashio southeast of Hokkaido, Japan

  • Takuya Hasegawa
  • Akira NaganoEmail author
  • Hiroyuki Matsumoto
  • Keisuke Ariyoshi
  • Masahide Wakita
Original Research Paper
  • 134 Downloads

Abstract

To investigate the impact of current variations of the Oyashio on bottom pressure (BP) at observation stations PG1 (\(41.7040^{\circ }\hbox {N}\), \(144.4375^{\circ }\hbox {E}\)) and PG2 (\(42.2365^{\circ }\hbox {N}\), \(144.8454^{\circ }\hbox {E}\)), which are located in the onshore region of the Kuril Trench off Kushiro–Tokachi, altimetric sea surface height (SSH) and ocean bottom pressure (OBP) gauge data were evaluated. Two and a half years after El Niño, during 2007–2008 and 2012–2013, the Oyashio retreated toward the northeast in association with strong warm-core rings, which were inferred from SSH elevations at both stations. BP at PG1 near the offshore edge of the continental shelf is enhanced corresponding to the SSH elevations in a barotropic manner. Meanwhile, at PG2, BP remained relatively unchanged in spite of the high SSH variability because the main pycnocline adjusted rapidly to the SSH elevations. BP changes at PG1 caused by the northeastward retreat of the Oyashio cannot be neglected to detect BP change by crustal deformations.

Keywords

Oyashio Sea surface height Bottom pressure El Niño 

Notes

Acknowledgements

The authors would like to thank Prof. D. Inazu (Tokyo University of Marine Science and Technology) and Dr. Y. Itoh (Kyoto Univerisity) for their insightful comments. The authors express gratitude to Ms. K. Taniguchi (JAMSTEC) for correcting the manuscript. Also, the authors are deeply grateful to the guest editor of this special issue and anonymous reviewers for helpful comments. This work was partly supported by the Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research (15H04228, 15H02835, 17K05660).

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Copyright information

© Springer Nature B.V. 2019
corrected publication 2019

Authors and Affiliations

  1. 1.Graduate school of ScienceTohoku UniversitySendaiJapan
  2. 2.Global Ocean Observation Research Center (GOORC)Japan Agency for Marine-Earth Science and Technology (JAMSTEC)YokosukaJapan
  3. 3.Research and Development Center for Earthquake and Tsunami Forecasting (FEAT)JAMSTECYokohamaJapan
  4. 4.Mutsu Institute for Oceanography (MIO)JAMSTECMutsuJapan

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