Kosei SASAOKA

Profile

Kosei SASAOKA

Physical and Chemical Oceanography Research Group
Engineer

Research Interests

Study on temporal and spatial variability of marine ecosystems using satellite remote sensing

Address

Global Ocean Observation Research Center (GOORC)
Research Institute for Global Change (RIGC)
Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
2-15 Natsushima, Yokosuka, 237-0061, Japan
TEL：+81-46-867-9441
FAX：+81-46-867-9835

Curriculum Vitae

1972.9.15 Born in Toyama
2002.3.25 Ph.D., Graduate school of Fisheries Sciences, Hokkaido University
2002.3.30～2003.9.30 Research fellow, Earth Observation Research Center, National Space Development Agency of Japan
2003.10.1～2005.3.30 Aerospace Project Research Associate, Earth Observation Research and Application Center, Japan Aerospace Exploration Agency
2005.4.1～2008.3.31 Postdoctoral Researcher, Frontier Research Center for Global Change, JAMSTEC
2008.4.1～2009.3.31 Scientist, Frontier Research Center for Global Change, JAMSTEC
2009.4.1～2012.5.31 Scientist, Research Institute for Global Change, JAMSTEC
2012.6.1～2014.3.31 Technical Support Staff, Research Institute for Global Change, JAMSTEC
2014.4.1～2019.3.31 Engineer, Research and Development for Global Change, JAMSTEC
2019.4.1～ Engineer, Research Institute for Global Change, JAMSTEC

Additional post

2007, 2008 A part-time instructor of Soka University
2008, 2009 A part-time instructor of Tokyo University of Information Sciences

Publications (Peer-reviewed)

  • 34. Taketani F., M. Aita, K. Yamaji, T. Sekiya, K. Ikeda, K. Sasaoka, T. Hashioka, M. Honda, K. Matsumoto and Y. Kanaya, Seasonal Response of North Western Pacific Marine Ecosystems to Deposition of Atmospheric Inorganic Nitrogen Compounds from East Asia, Scientific Reports, 8,9324, doi:10.1038/s41598-018-27523-w, 2018.
  • 33. Smith S. L, M. Pahlow, A. Merico, E. Acevedo-Trejos, Y. Sasai, C. Yoshikawa, K. Sasaoka, T. Fujiki, K. Matsumoto and M. C. Honda, Flexible phytoplankton functional type (FlexPFT) model: size-scaling of traits and optimal growth. Journal of Plankton Research, doi: 10.1093/plankt/fbv038, 2015.
  • 32. Siswanto, E., M. C. Honda, Y. Sasai, K. Sasaoka and T. Saino, Meridional and seasonal footprints of the Pacific Decadal Oscillation on phytoplankton biomass in the northwestern Pacific Ocean. Journal of Oceanography, 72, 3, 465-477, doi: 10.1007/s10872-016-0367-z, 2016.
  • 31. Siswanto, E., M. C. Honda, K. Matsumoto, Y. Sasai, T. Fujiki, K. Sasaoka and T. Saino, Sixteen-year phytoplankton biomass trends in the northwestern Pacific Ocean observed by the SeaWiFS and MODIS ocean color sensors. Journal of Oceanography, 10.1007/s10872-016-0357-1, 2016.
  • 30. Siswanto, E., K. Matsumoto, M. C. Honda, T. Fujiki, K. Sasaoka, and T. Saino, Reappraisal of meridopnal differences of factors controlling phytoplankton biomass and initial increase preceding seasonal bloom in the northwestern Pacific Ocean. Remote Sensing of Environment 159, 44-56, doi:10.1016/j.rse.2014.11.028, 2014.
  • 29. Sasai, Y., C. Yoshikawa, S. L. Smith, T. Hashioka, K. Matsumoto, M. Wakita, K. Sasaoka and M. C. Honda, Coupled 1-D physical-biological model study of phytoplankton production at two contrasting time-series stations in the western North Pacific. Journal of Oceanography, doi 10.1007/s10872-015-0341-1, 2016.
  • 28. Mino, Y., C. Sukigara, M. C. Honda, H. Kawakami, K. Matsumoto, M. Wakita, M. Kitamura, T. Fujiki, K. Sasaoka, O. Abe, J. Kaiser and T. Saino, Seasonal variations in the nitrogen isotopic composition of settling particles at station K2 in the western Subarctic North Pacific, Journal of Oceanography, 72, 6, 819-836, doi: 10.1007/s10872-016-0381-1, 2016.
  • 27. Matsumoto, K., M. C. Honda, K. Sasaoka, M. Wakita, H. Kawakami and S. Watanabe, Seasonal variability of primary production and phytoplankton biomass in the western Pacific subarctic gyre: Control by light availability within the mixed layer, Journal of Geophysical Research: Oceans, 119, 6523-6534, doi: 10.1002/2014JC009982, 2014.
  • 26. M. Wakita, S. Watanabe, M. Honda, A. Nagano, K. Kimoto, K. Matsumoto, H. Kawakami, T. Fujiki, M. Kitamura, K. Sasaki, K. Sasaoka, Y. Nakano and A. Murata, Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean, Biogeosciences, 10, doi:10.5194/bg-10-7817-2013, 7817-7827, 2013.
  • 25. Kitamura, M., T. Kobari, M. C. Honda, K. Matsumoto, K. Sasaoka, R. Nakamura and K. Tanabe, Seasonal changes in the mesozooplankton biomass and community structure in subarctic and subtropical time-series stations in the western North Pacific. Journal of Oceanography, 72, 3, 387-402, doi: 10.1007/s10872-015-0347-8, 2016.
  • 24. Honda M. C., M. Wakita, K. Matsumoto, T. Fujiki, E. Siswanto, K. Sasaoka, H. Kawakami, Y. Mino, C. Sukigara, M. Kitamura, Y. Sasai, S. L. Smith, T. Hashioka, C. Yoshikawa, K. Kimoto , S. Watanabe, T. Kobari, T. Nagata, K. Hamasaki, R. Kaneko, M. Uchimiya, H. Fukuda, O. Abe and T. Saino, Comparison of carbon cycle between the western Pacific subarctic and subtropical time-series stations: highlights of the K2S1 project, Journal of Oceanography, doi: 10.1007/s10872-017-0423-3, 2017.
  • 23. Fujiki, T., K. Sasaoka, K. Matsumoto, M. Wakita and Y. Mino, Seasonal variability of phytoplankton community structure in the subtropical western North Pacific, Journal of Oceanography, 72, 343 – 358, doi: 10.1007/s10872-015-0346-9, 2016.
  • 22. Fujiki, T., K. Matsumoto, Y. Mino, K. Sasaoka, M. Wakita, H. Kawakami, M. C. Honda, S. Watanabe and T. Saino, The seasonal cycle of phytoplankton community structure and photo-physiological state in the western subarctic gyre of the North Pacific, Limnology and Oceanography, 59, 3, 887-900, 2014.
  • 21. Chiba S., S Batten, T Yoshiki, Y Sasaki, K Sasaoka, H Sugisaki, and T Ichika, Temperature and zooplankton size structure: climate control and basin-scale comparison in the North Pacific, Ecology and Evolution, doi:10.1002/ece3.1408, 2014.
  • 20. Yoshiki T., S. Chiba, H. Sugisaki, K. Sasaoka, T. Ono and S. Batten, Interannual and regional variations in abundance patterns and developmental timing in mesozooplankton of the western North Pacific Ocean based on Continuous Plankton Recorder during 2001–2009, J. Plankton Res., doi:10.1093/plankt/fbt047, 2013.
  • 19. Chiba S, S. Batten, K. Sasaoka, H. Sugisaki (2012) Influence of the Pacific Decadel Oscillation on phytoplankton phenology and community structure in the western North Pacific based on satellite observation and the Continuous Plankton Recorder survey for 2001–2009. Geophysical Research Letters. Vol. 39, L15603, doi:10.1029/2012GL052912
  • 18. Sasaoka, K., S. Chiba and T. Saino, Climatic forcing and phytoplankton phenology over the subarctic North Pacific from 1998 to 2006, as observed from ocean color data, Geophys. Res. Lett., 38, L15609, doi:10.1029/2011GL048299, 2011.
  • 17. Honda, M., K. Sasaoka, H. Kawakami, K. Matsumoto, S. Watanabe and T. Dickey, Application of underwater optical data to estimation of primary productivity, Deep-Sea Res. Part1, 56, 2281-2292, 2009.
  • 16. Yamagishi, H., Y. Tohjima, H. Mukai and K. Sasaoka, Detection of regional scale sea-to-air oxygen emission related to spring bloom near Japan by using in-situ measurements of the atmospheric oxygen/nitrogen ratio, Atmos. Chem. Phys., 8, 3325-3335, 2008.
  • 15. Sasai, Y., H.Sasaki, K.Sasaoka, A.Ishida, and Y.Yamanaka, Marine ecosystem simulation in the eastern tropical Pacific with a global eddy resolving coupled physical-biological model, Geophys. Res. Lett., 34, L23601, doi:10.1029/2007GL031507, 2007.
  • 14. Sasai, Y., K.Sasaoka, H.Sasaki, and A.Ishida, Seasonal and intra-seasonal variability of chlorophyll-a in the North Pacific: Model and Satellite data, J. Earth Simulation, 8, 3-11, 2007.
  • 13. Honda, M., H. Kawakami, K. Sasaoka, S. Watanabe and T. Dickey, Quick transport of primary produced organic carbon to the ocean interior, Geophys. Res. Lett., 33, L16603, doi:10.1029/2006GL026466, 2006.
  • 12. Murakami, H., K. Sasaoka, K. Hosoda, H. Fukushima, M. Toratani, R. Frouin, B. G., Mitchell, M. Kahru, P. Deschamps, D. Clark, S. Flora, M. Kishino, S. Saitoh, I. Asanuma, A. Tanaka, H. Sasaki, K. Yokouchi, Y. Kiyomoto, H. Saito, C. Dupouy, A. Siripong and J. Ishizaka, Validation of ADEOS-2 GLI ocean-color products using in-situ observations, J. Oceanogr., 62, 373-393, 2006.
  • 11. Sarma, V. V. S. S., T. Saino, K. Sasaoka, Y. Nojiri, T. Ono, M. Ishii, H. Y. Inoue and K. Matsumoto, Basin-scale pCO2 distribution using satellite sea surface temperature, Chl a, and climatological salinity in the North Pacific in spring and summer, Global Biogeochem. Cycles, 20, GB3005, doi:10.1029/2005GB002594, 2006.
  • 10. Goes, J.I., K. Sasaoka, H.R.Gomes, S. Saitoh and T. Saino, A comparison of the seasonality and interannual variability of phytoplankton biomass and production in the western and eastern gyres of the subarctic Pacific using multi-sensor satellite data, J. Oceanogr., 60, 75-91, 2004.
  • 9. Shiomoto, A., S. Hashimoto, K. Sasaoka and M. Toratani, Size-fractionated chlorophyll a concentration at the surface in the offshore subarctic North Pacific in summer 2000, La mer, 41, 225-228, 2003.
  • 8.　Asanuma, I., Jens, N., K. Sasaoka, K. Matsumoto and T. Kawano, Optical properties control primary productivity model on the East China Sea, Ocean Remote Sensing and Applications. Edited by Frouin, Robert J.; Yuan, Yeli; Kawamura, Hiroshi. Proceedings of the SPIE, 4892, 312-319, 2003.
  • 7. Sasaoka K., S. Saitoh, I. Asanuma, K. Imai, M. Honda, Y. Nojiri and T. Saino, Temporal and spatial variability of chlorophyll a in the Western subarctic Pacific determined from satellite and ship observations from 1997 to 1999, Deep Sea Res., Part II, 49, 5557-5576, 2002.
  • 6.　Shiomoto, A., S. Saitoh, K. Imai, M. Toratani, Y. Ishida and K. Sasaoka, Interannual variation in phytoplankton biomass in the Bering Sea basin in the 1990s, Prog. Oceanogr., 55, 147-163, 2002.
  • 5. Saitoh, S., T. Iida and K. Sasaoka, A description of temporal and spatial variability in the Bering Sea spring phytoplankton blooms (1997-1999) using satellite multi-sensor remote sensing, Prog. Oceanogr., 55, 131-146, 2002.
  • 4. Nakabayashi S., K. Kuma, K. Sasaoka, S. Saitoh, M. Mochizuki, N. Shiga and M. Kusakabe, Variation in iron (III) solubility and iron concentration in the northwestern North Pacific Ocean, Limnol. Oceanogr., 47, 885-892, 2002.
  • 3. Mizobata, K., S. Saitoh, A. Shiomoto, T. Miyamura, N. Shiga, K. Imai, M. Toratani, Y. Kajiwara and K. Sasaoka, Bering Sea cyclonic and anticyclonic eddies observed during summer 2000 and 2001, Prog. Oceanogr., 55, 65-75, 2002.
  • 2. Suzuki, K., M. Kishino, K. Sasaoka, S. Saitoh and T. Saino, Chlorophyll-specific absorption coefficients and pigments of phytoplankton off Sanriku, Northwestern North Pacific, J. Oceanogr., 54, 517-526, 1998.
  • 1. Saitoh, S., D. Inagake, K. Sasaoka, J. Ishizaka, Y. Nakame and T. Saino, Satellite and ship observations of Kuroshio warm-core ring 93A off Sanriku in spring 1997, J. Oceanogr., 54, 495-508, 1998.

Publications （Non reviewed）

  • 16. Sasaoka, K., 3.10 Chlorophyll a and 3.11 Absorption Coefficients of Particulate Matter and Colored Dissolved Organic Matter (CDOM), WHP I10 REVISIT IN 2015 DATA BOOK -Field Activity of JAMSTEC towards a Sustained Global Survey of the Ocean Interior-, Uchida, H., K. Katsumata and T. Doi (Eds.), 83-88, 2018, ISBN: 978-4-901833-35-6, doi: 10.17596/0000002.
  • 15. Sasaoka, K., 3.7 Chlorophyll a and 3.8 Absorption Coefficients of Particulate Matter and Colored Dissolved Organic Matter (CDOM), WHP P01 REVISIT IN 2014 DATA BOOK -Field Activity of JAMSTEC towards a Sustained Global Survey of the Ocean Interior-, Uchida, H., and T. Doi (Eds.), 88-92, 2017, ISBN: 978-4-901833-22-6.
  • 14. Sasaoka, K., Special issue: Light in Planktology, Current status and issues of the ocean color remote sensing, KAIYO MONTHLY, Vol.48, 3, 57-66, 2016 (in Japanese).
  • 13. Sasaoka, K., Special issue: Ocean Remote Sensing, 4. Current status of ocean color algorithms, Journal of the Japan Society of Photogrammetry and Remote Sensing, Vol.52, No.5, 243-246, 2013 (In Japanese).
  • 12. Sasaoka, K., A. Itoh : 6 Ecosystems, 6.16 Primary productivity of ecosystems in the ocean and land. In "Encyclopedia of global environment", eds. Noda, A. and Yoshizaki, M., Asakura shoten, Tokyo, p.378 (In Japanese) (2013) (writing share)
  • 11. Sasaoka, K., Analysis of Satellite Ocean Color data, Akihiko Morimoto (ed.), Oceanography Basics - The textbook for 16th IHP Training Course in 2006-, Hydrographic Atmospheric Research Center (HyARC), Nagoya University and UNESCO, pp. 141-150, 2007.
  • 10. Sasaoka, K., T. Hirawake and S. Saitoh, Current status and future view of estimation of oceanic primary production based on satellite data, Kaiyo Monthly, 38, 425-432, 2006 (in Japanese).
  • 9. Sasaoka, K., J. I. Goes, S. Saitoh and T. Saino, Seasonal and interannual variability of phytoplankton biomass and productivity in the sub-arctic Pacific using multi-sensor satellite data, Proceedings of the third international workshop on marine remote sensing in Northwest Pacific Region, 11-12 October, 2004, Peking University, Beijing, China, 272-283, 2005.
  • 8. Saitoh, S., T. Hirawake and K. Sasaoka, Global ocean primary production using satellite ocean color sensors, Recent Progress of Bio/Chemiluminescence and Fluorescence Analysis in Photosynthesis, Wada, N. and M. Mimuro (Eds.), Research Signpost, India, 253-280, 2005.
  • 7.　Saitoh, S. and K. Sasaoka, Seasonal and interannual variability of chlorophyll a and primary productivity during 1997 to 2000, using multi-sensor remote sensing, Proceedings of the 2nd Japan-Korea Joint Seminar on Fisheries Sciences, August 20-23, Sapporo-Onuma, Japan, pp.63-66, 2003.
  • 6. Sasaoka, K. and S. Saitoh, Measurement of phytoplankton distribution and primary productivity using satellite, Kaiyo Monthly, 34, 182-190, 2002 (in Japanese).
  • 5. Sasaoka, K., S. Saitoh and T. Saino, Seasonal and Interannual Variability of Chlorophyll a and Primary Productivity in the subarctic North Pacific during 1997-2000 using Multi-Sensor Remote Sensing, Proceedings of the International Workshop on”Global Ocean Productivity and the Fluxes of Carbon and Nutrients: Combining Observations and Models”, JGOFS Global Synthesis Working Group (GSWG) and JGOFS/GAIM Task Team, 24-27 June 2002, Joint Research Center, ISPRA, Italy, pp6, 2002.
  • 4. Sasaoka, K., S. Saitoh, I. Asanuma, K. Imai, M. Honda and T. Saino, Ocean color variability of Japan JGOFS time series station KNOT and its adjacent waters, northwestern north Pacific observed by OCTS and SeaWiFS during 1996-1999, Proceedings of the International Symposium on Ocean Color Remote Sensing and Carbon Flux& JUWOC-99, pp26, 1999.
  • 3. Sasaoka, K., S. Saitoh, S. Ban, I. Kudoh and H. Miyake, Coastal Oyashio Multi-disciPlinary and Advanced Study (COMPAS) program using new ocean color remote sensing and intensive ship observations, Mem. Fac. Fish., Hokkaido Univ.,45, 11-17, 1998.
  • 2. Kishino, M., S. Saitoh, K. Sasaoka and K. Suzuki, Optical characteristics off Sanriku, Northwestern North Pacifc, in Ocean Optics XIV, Proc. SPIE Int. Soc. Opt. Eng., CD-ROM press, 1998.
  • 1. Saitoh, S., K. Sasaoka, T. Yoshida, S. Ban and M. Kishino, Bio-optical characteristics of sea water in Funka Bay and its adjacent waters detected by OCTS (Ocean Color and Temperature Scanner) and ship observations during the period of spring bloom, in Ocean Optics XIV, Proc. SPIE Int. Soc. Opt. Eng., CD-ROM press, 1998.