Curriculum Vitae

Name: Eitarou Oka (Passport name: Eitaro Oka)
Sex: Male
Birth: Nov.17, 1970, Tokyo, Japan
Nationality: Japanese
Family: Wife, four sons

Education:
B.Sc., The University of Tokyo, Tokyo, Japan, 1994
M.Sc., The University of Tokyo, Tokyo, Japan, 1996
D.Sc., The University of Tokyo, Tokyo, Japan, 2000 (Adviser: Masaki Kawabe)

Professional Experience:
April 2000-June 2004: Research Scientist,
   Frontier Observational Research System for Global Change, Yokosuka, Japan
July 2004-March 2006: Research Scientist,
   Institute of Observational Research for Global Change, JAMSTEC, Yokosuka, Japan
   (organization name changed)
April 2005-March 2006: Visiting Scholar,
   Scripps Institution of Oceanography, UCSD, CA, USA
April 2006-March 2010: Lecturer,
   Ocean Research Institute, The University of Tokyo, Tokyo, Japan
April 2006-March 2007: Research Scientist (part-time),
   Institute of Observational Research for Global Change, JAMSTEC, Yokosuka, Japan
April 2007-March 2009: Invited Research Scientist (part-time),
   Institute of Observational Research for Global Change, JAMSTEC, Yokosuka, Japan
   (job title changed)
April 2009-December 2010: Invited Research Scientist (part-time),
   Research Institute for Global Change, JAMSTEC, Yokosuka, Japan
   (organization name changed)
April 2010-April 2011: Lecturer,
   Atmosphere and Ocean Research Institute, The University of Tokyo, Tokyo, Japan
   (organization name changed)
April 2011-present: Associate Professor,
   Atmosphere and Ocean Research Institute, The University of Tokyo, Tokyo, Japan
April 2019-March 2020: Visiting Colleague,
   International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, HI, USA

Research Cruises (* Chief Scientist):
1. R/V Hakuho-maru, KH-94-3 (Leg1), Sep.2-23, 1994, Tokyo-Yokohama.
2. R/V Hakuho-maru, KH-95-1, May12-Jun.12, 1995, Tokyo-Kagoshima-Tokyo.
3. R/V Tansei-maru, KT-96-5, Apr.20-26, 1996, Yokosuka-Tokyo.
4. R/V Hakuho-maru, KH-96-4, Oct.17-Nov.27, 1996, Tokyo-Kagoshima-Yokohama-Tokyo.
5. R/V Tansei-maru, KT-97-14, Sep.1-7, 1997, Oduchi-Hachinohe.
6. R/V Tansei-maru, KT-97-18, Dec.2-8, 1997, Tokyo-Yokosuka.
7. R/V Hakuho-maru, KH-99-1, Jan.14-Mar.4, 1999, Tokyo-Ponpei-Guam-Tokyo.
8. R/V Mirai, MR00-K07 (Leg1), Oct.18-Nov.8, 2000, Sekinehama-Singapore.
9. R/V Tansei-maru, KT-01-16, Nov.22-Dec.1, 2001, Tokyo-Yokosuka.
10. R/V Mirai, MR02-K01 (Leg1), Jan.7-17, 2002, Yokohama-Honolulu.
11. R/V Mirai, MR02-K06 (Leg4), Feb.1-14, 2003, Honolulu-Sekinehama.
12. R/V Hakuho-maru, KH-07-1 (Leg2), May 9-Jun.8, 2007, Hakodate-Tokyo.
13. R/V Hakuho-maru, KH-08-3 (Leg2), Oct.9-Nov.7, 2008, Shiogama-Tokyo.
14. R/V Tansei-maru, KT-09-9*, Jun.12-17, 2009, Shiogama-Tokyo.
15. R/V Tansei-maru, KT-09-21, Oct.15-26, 2009, Tokyo-Shiogama.
--. R/V Hakuho-maru, KH-11-3 (Leg2), Mar.13-23, 2011, Tokyo-Tokyo. --> aborted due to earthquake --> implemented as KH-14-1
16. R/V Hakuho-maru, KH-11-8, Aug.12-Oct.4, 2011, Tokyo-San Francisco-Tokyo.
17. R/V Tansei-maru, KT-12-16*, Jun.29-Jul.9, 2012, Miyazaki-Ishinomaki.
18. R/V Hakuho-maru, KH-13-3*, Apr.2-May 1, 2013, Tokyo-Kushiro-Shimonoseki.
19. R/V Shinsei-maru, KS-13-T4*, Nov.8-14, 2013, Yokosuka-Yokosuka.
20. R/V Hakuho-maru, KH-14-1, Feb.21-Mar.13, 2014, Tokyo-Tokyo.
21. R/V Shinsei-maru, KS-14-7*, May 13-26, 2014, Yokosuka-Yokosuka.
22. R/V Shinsei-maru, KS-15-2*, Apr 23-30, 2015, Tokyo-Sendai.
23. R/V Shinsei-maru, KS-15-14*, Oct 19-29, 2015, Yokosuka-Yokosuka.
24. R/V Shinsei-maru, KS-16-3*, Apr 2-6, 2016, Yokosuka-Yokosuka.
25. R/V Hakuho-maru, KH-16-2*, May 17-19, 2016, Tokyo-Tokyo.
26. R/V Hakuho-maru, KH-16-3*, May 31-Jun.29, 2016, Tokyo-Tokyo.
27. R/V Shinsei-maru, KS-17-2*, Apr 3-7, 2017, Yokosuka-Ishinomaki.
28. R/V Hakuho-maru, KH-17-1*, Apr 25-28, 2017, Tokyo-Tokyo.
29. R/V Shinsei-maru, KS-18-1*, Jan 18-30, 2018, Yokosuka-Yokosuka. (cruise web page)
30. R/V Shinsei-maru, KS-18-4, Apr 20-May 1, 2018, Yokosuka-Yokosuka. (cruise web page)
31. R/V Shinsei-maru, KS-18-7*, Jul.16-19, 2018, Yokosuka-Miyako.
32. R/V Hakuho-maru, KH-17-4*, Aug.3-10, 2018, Kagoshima-Tokyo.

Professional Services (Selected):
Member, Board of Directors, The Oceanographic Society of Japan, 2011-14, 2017-
Member of the Council, The Oceanographic Society of Japan, 2012-
Editor, Journal of Oceanography, 2016-
Member, Ocean Observations Panel for Physics and Climate, 2017-

Societies:
The Oceanographic Society of Japan
American Geophysical Union
Japan Geoscience Union
Japan Society of Ocean Policy
Japan Cactus Association (tentative name)
AORI football club


Refereed Publications:

Tanaka, K. and E. Oka, 2019: A brief overview of recent activities and approaches for investigating shelf-basin exchange processes and coastal sea circulation around Japan. Coastal Marine Science, 42, 12-15. [link: open access]

Palmer, M. D., P. Durack, M. P. Chidichimo, J. Church, S. E. Cravatte, K. L. Hill, J. Johannessen, J. Karstensen, T. Lee, D. Legler, M. Mazloff, E. Oka, S. Purkey, B. Rabe, J.-B. Sall¸«±e, B. M. Sloyan, S. Speich, K. von Schuckmann, J. Willis, and S. E. Wijffels, 2019: Adequacy of the ocean observation system for quantifying regional heat and freshwater storage and change. Frontiers in Marine Science. 6:416. doi:10.3389/fmars.2019.00416. [link: open access]

Sloyan, B. M., J. Wilkin, K. L. Hill, M. P. Chidichimo, M. F. Cronin, J. A. Johannessen, J. Karstensen, M. Krug, T. Lee, E. Oka, M. D. Palmer, B. Rabe, S. Speich, K. von Schuckmann, R. A. Weller, and W. Yu, 2019: Evolving the Physical Global Ocean Observing System for Research and Application Services Through International Coordination. Frontiers in Marine Science. 6:449. doi:10.3389/fmars.2019.00449.[link: open access]

Kawai, Y., H. Nishikawa, and E. Oka, 2019: In situ evidence of low-level atmospheric responses to the Oyashio front in early spring. Journal of the Meteorological Society of Japan, 97, 423-438. [link: open access]

Oka, E., K. Yamada, D. Sasano, K. Enyo, T. Nakano, and M. Ishii, 2019: Remotely forced decadal physical and biogeochemical variability of North Pacific Subtropical Mode Water over the last 40 years. Geophysical Research Letters, 46, 1555-1561. [link]

Kumamoto, Y., M. Aoyama, Y. Hamajima, E. Oka, and A. Murata, 2018: Time evolution of Fukushima-derived radiocesium in the western subtropical area of the North Pacific Ocean by 2017. Journal of Radioanalytical and Nuclear Chemistry, 189, 2181-2187. [link: open access]

Inomata, Y., M. Aoyama, T. Tsubono, D. Tsumune, Y. Kumamoto, H. Nagai, T. Yamagata, M. Kajino, T. Tanaka, T. Sekiyama, E. Oka, M. Yamada, 2018: Estimate of Fukushima-derived radiocaesium in the North Pacific Ocean in summer 2012. Journal of Radioanalytical and Nuclear Chemistry, 189, 1587-1596. [link]

Aoyama, M., Y. Hamajima, Y. Inomata, Y. Kumamoto, E. Oka, T. Tsubono, and D. Tsumune, 2018: Radiocaesium derived from TEPCO Fukushima accident in the North Pacific Ocean: surface transport processes until 2017. Journal of Environmental Radioactivity, 189, 93-102. [link]

Oka, E., M. Ishii, T. Nakano, T. Suga, S. Kouketsu, M. Miyamoto, H. Nakano, B. Qiu, S. Sugimoto, and Y. Takatani, 2018: Fifty years of the 137E repeat hydrographic section in the western North Pacific Ocean. Journal of Oceanography, 74, 115-145. [link: open access]

Hu, W., K. Murata, S. Fukuyama, Y. Kawai, E. Oka, M. Uematsu, and D. Zhang, 2017: Concentration and viability of airborne bacteria over the Kuroshio Extension region in the northwestern Pacific Ocean: data from three cruises. Journal of Geophysical Research - Atmospheres, 23, 12892-12905. [link]

Oka, E., S. Katsura, H. Inoue, A. Kojima, M. Kitamoto, T. Nakano, and T. Suga, 2017: Long-term change and variation of salinity in the western North Pacific subtropical gyre revealed by 50-year long observations along 137E. Journal of Oceanography, 73, 479-490. [link: open access]

Aoyama, M., Y. Hamajima, Y. Inomata, and E. Oka, 2017: Recirculation of FNPP1-derived radiocaesium observed in winter 2015/2016 in coastal regions of Japan. Applied Radiation and Isotopes, 126, 83-87. [link]

Miyamoto, M., E. Oka, D. Yanagimoto, S. Fujio, G. Mizuta, S. Imawaki, M. Kurogi, and H. Hasumi, 2017: Characteristics and mechanism of deep mesoscale variability south of the Kuroshio Extension. Deep-Sea Research Part I, 123, 110-117. [link]

Kumamoto, Y., M. Aoyama, Y. Hamajima, H. Nagai, T. Yamagata, Y. Kawai, E. Oka, A. Yamaguchi, K. Imai, and A. Murata, 2017: Fukushima-derived radiocesium in the western North Pacific in 2014. Journal of Radioanalytical and Nuclear Chemistry, 311, 1209-1217. [link]

Kobashi, F., Y. Onikata, N. Iwasaka, Y. Kawai, E. Oka, K. Uehara, S.-I. Ito, M. Odamaki, and H. Sasaki, 2016: Small meanders of the Kuroshio Extension and associated northward spreading of warm water: Three-vessel simultaneous observations and an eddy-resolving ocean model simulation. Journal of Geophysical Research, 121, 5315-5337. [link]

Aoyama M., Y. Hamajima, M. Hult, M. Uematsu, E. Oka, D. Tsumune, and Y. Kumamoto, 2016: 134Cs and 137Cs in the North Pacific Ocean derived from the TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan in March 2011: Part One - Surface pathway and vertical distributions. Journal of Oceanography, 72, 53-65. [link]

Katsura S., E. Oka, and K. Sato, 2015: Formation Mechanism of Barrier Layer in the Subtropical Pacific. Journal of Physical Oceanography, 45, 2790-2805. [link]

Oka E., B. Qiu, Y. Takatani, K. Enyo, D. Sasano, N. Kosugi, M. Ishii, T. Nakano, and T. Suga, 2015: Decadal variability of Subtropical Mode Water subduction and its impact on biogeochemistry. Journal of Oceanography, 71, 389-400. [pdf]

Oka E., K. Uehara, T. Nakano, T. Suga, D. Yanagimoto, S. Kouketsu, S. Itoh, S. Katsura, and L. D. Talley, 2014: Synoptic observation of Central Mode Water in its formation region in spring 2003. Journal of Oceanography, 70, 521-534. [pdf]

Sukigara C., T. Suga, K. Toyama, and E. Oka, 2014: Biogeochemical responses associated with the passage of a cyclonic eddy based on shipboard observations in the western North Pacific. Journal of Oceanography, 70, 435-445. [pdf]

Iwasaka N., F. Kobashi, K. Uehara, E. Oka, M. Konda, T. Murayama, Y. Tanimoto, K. Kutsuwada, M. Kubota, and K. Suzuki, 2014: A comprehensive, simultaneous ocean and atmosphere observation north of the Kuroshio Extension in autumn 2009. Umi to Sora, 89, 99-114. [pdf]

Oka E., A. Isobe, K. Ichikawa, Y. Masumoto, T. Suga, Y. Kawai, K.I. Ohshima, K. Shimada, H. Hasumi, S. Minobe, T. Waseda, N. Iwasaka, M. Kawamiya, S. Itoh, M. Kubota, T. Nakano, T. Hibiya, and H. Yoritaka, 2013: Decadal Vision in Oceanography (I) - Discussions in the physical oceanography subgroup of the future planning committee, The Oceanographic Society of Japan -. Umi no Kenkyu (Oceanography in Japan), 22, 191-218 (in Japanese with English abstract and legends). [pdf]

Katsura S., E. Oka, B. Qiu, and N. Schneider, 2013: Formation and subduction of North Pacific Tropical Water and their interannual variability. Journal of Physical Oceanography, 43, 2400-2415. [pdf]

Ueno, H., I. Yasuda, S. Itoh, H. Onishi, Y. Hiroe, T. Suga, and E. Oka, 2012: Modification of a Kenai eddy along the Alaskan Stream. Journal of Geophysical Research, 117, C08032, doi:10.1029/2011JC007506. [pdf]

Wagawa, T., Y. Yoshikawa, Y. Isoda, E. Oka, K. Uehara, T. Nakano, K. Kuma, and S. Takagi, 2012: Flow fields around the Emperor Seamounts detected from current data. Journal of Geophysical Research, 117, C06006, doi:10.1029/2011JC007530. [pdf]

Oka, E., B. Qiu, S. Kouketsu, K Uehara, and T Suga, 2012: Decadal seesaw of the Central and Subtropical Mode Water formation associated with the Kuroshio Extension variability. Journal of Oceanography, 68, 355-360. [pdf]

Kouketsu, S., H. Tomita, E. Oka, S. Hosoda, T. Kobayashi, and K. Sato, 2012: The role of meso-scale eddies in mixed layer deepening and mode water formation in the western North Pacific. Journal of Oceanography, 68, 63-77. [pdf]

Oka, E., and B. Qiu, 2012: Progress of North Pacific mode water research in the past decade. Journal of Oceanography, 68, 5-20. [pdf]

Tomita, H., S. Kouketsu, E. Oka, and M. Kubota, 2011: Locally enhanced wintertime air-sea interaction and deep oceanic mixed layer formation associated with the subarctic front in the North Pacific. Geophysical Research Letters, 38, L24607, doi:10.1029/2011GL049902. [pdf]

Oka, E., T. Suga, C. Sukigara, K. Toyama, K. Shimada, and J. Yoshida, 2011: "Eddy resolving" observation of the North Pacific Subtropical Mode Water. Journal of Physical Oceanography, 41, 666-681. [pdf]

Oka, E., S. Kouketsu, K. Toyama, K. Uehara, T. Kobayashi, S. Hosoda, and T. Suga, 2011: Formation and subduction of Central Mode Water based on profiling float data, 2003-08. Journal of Physical Oceanography, 41, 113-129. [pdf]

Ueno H., H. J. Freeland, W. R. Crawford, H. Onishi, E. Oka, K. Sato, and T. Suga, 2009: Anticyclonic eddies in the Alaskan Stream. Journal of Physical Oceanography, 39, 934-951. [pdf]

Oka E., K. Toyama, and T. Suga, 2009: Subduction of North Pacific central mode water associated with subsurface mesoscale eddy. Geophysical Research Letters, 36, L08607, doi:10.1029/2009GL037540. [pdf]

Oka E., 2009: Seasonal and interannual variation of North Pacific Subtropical Mode Water in 2003-2006. Journal of Oceanography, 65, 151-164. [pdf]

Ueno, H., E. Oka, T. Suga, H. Onishi, and D. Roemmich, 2007: Formation and variation of temperature inversions in the eastern subarctic North Pacific. Geophysical Research Letters, 34(5), L05603, doi:10.1029/2006GL028715. [pdf]

Oka, E., L. D. Talley, and T. Suga, 2007: Temporal variability of winter mixed layer in the mid- to high-latitude North Pacific. Journal of Oceanography, 63, 293-307. [pdf]

Isoguchi, O., H. Kawamura, and E. Oka, 2006: Quasi-stationary jets transporting surface warm waters across the transition zone between the subtropical and the subarctic gyres in the North Pacific. Journal of Geophysical Research, 111, C10003, doi:10.1029/2005JC003402. [pdf]

Oka, E. and T. Suga, 2005: Differential formation and circulation of North Pacific Central Mode Water. Journal of Physical Oceanography, 35, 1997-2011. [pdf]

Ueno, H., E. Oka, T. Suga, and H. Onishi, 2005: Seasonal and interannual variability of temperature inversions in the subarctic North Pacific. Geophysical Research Letters, 32(20), L20603, doi:10.1029/2005GL023948. [pdf]

Oka, E., 2005: Long-term sensor drift found in recovered Argo profiling floats. Journal of Oceanography, 61, 775-781. [pdf]

Oka, E. and K. Ando, 2004: Stability of temperature and conductivity sensors of Argo profiling floats. Journal of Oceanography, 60, 253-258. [pdf]

Oka, E. and T. Suga, 2003: Formation region of North Pacific Subtropical Mode Water in the late winter of 2003. Geophysical Research Letters, 30(23), 2205, doi:10.1029/2003GL018581. [pdf]

Oka, E. and M. Kawabe, 2003: Dynamic structure of the Kuroshio south of Kyushu in relation to the Kuroshio path variations. Journal of Oceanography, 59, 595-608. [pdf]

Iwasaka, N., M. Aoshima, T. Suga, T. Kobayashi, and E. Oka, 2003: A case study of a mesoscale cyclonic eddy observed in the region south of the Kuroshio Extension during Pre Japan-Argo. Umi no Kenkyu (Oceanography in Japan), 12, 215-226 (in Japanese with English abstract and legends). [pdf]

Iwasaka, N., T. Suga, K. Takeuchi, K. Mizuno, Y. Takatsuki, K. Ando, T. Kobayashi, E. Oka, Y. Ichikawa, M. Miyazaki, H. Matsuura, K. Izawa, C.-S. Yang, N. Shikama, and M. Aoshima, 2003: Pre-Japan-ARGO: Experimental observation of upper and middle layers south of the Kuroshio Extension region by using profiling floats. Journal of Oceanography, 59, 119-127. [pdf]

Oka, E. and M. Kawabe, 1998: Characteristics of variations of water properties and density structure around the Kuroshio in the East China Sea. Journal of Oceanography, 54, 605-617. [pdf]


(This page last updated: Apr. 1, 2019)


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