S. Okajima †

Papers (submitted) †

• Satoh, R., Y. Kosaka, H. Nakamura, A. Miyamoto, S. Okajima: Energetics of Atmospheric Meridional Teleconnection Patterns over the North Pacific in Winter.

Papers (in press) †

Peer-reviewed papers †

• Okajima, S., Nakamura, H., & Spengler, T. (2024). Midlatitude oceanic fronts strengthen the hydrological cycle between cyclones and anticyclones. Geophysical Research Letters, 51, e2023GL106187. https://doi.org/10.1029/2023GL106187
• Okajima, S., Nakamura, H., & Kaspi, Y. (2024). Anticyclonic suppression of the North Pacific transient eddy activity in midwinter. Geophys. Res. Lett., 51, e2023GL106932. https://doi.org/10.1029/2023GL106932.

• Okajima, S., H. Nakamura, Y. Kaspi: Distinct roles of cyclones and anticyclones in setting the midwinter minimum of the North Pacific eddy activity: a Lagrangian perspective, J. Climate, 36(14), 4793-4814, 2023. Journal Site
• Nomura, S., B. Taguchi, H. Tamura, S. Okajima: Forcing Mechanisms associated with the Destructive Record-High 2008 Ocean Swell Wave in Toyama Bay, Earth and Space Science, 10, e2022EA002750, 2023. Journal Site

• Okajima, S., H. Nakamura, Y. Kaspi: Energetics of transient eddies related to the midwinter minimum of the North Pacific storm-track activity, J. Climate, 35(4), 1137-1156, 2022. Journal Site
• Kuwano-Yoshida, A., S. Okajima, H. Nakamura: Rapid increase of explosive cyclone activity over the midwinter North Pacific in the late 1980s, J. Climate, 35(3), 1113-1133, 2022. Journal Site*Press release(RCAST)*

• Okajima, S., H. Nakamura, Y. Kaspi: Cyclonic and anticyclonic contributions to atmospheric energetics, Scientific Reports, 11, 13202, 2021. Journal Site *Press release(UTokyo Focus)*

• Okajima, S., H. Nakamura, K. Nishii, T. Miyasaka, A. Kuwano-Yoshida, B. Taguchi, M. Mori, Y. Kosaka: Mechanisms for the Maintenance of Wintertime Basin-Scale Atmospheric Response to Decadal SST Variability in the North Pacific Subarctic Frontal Zone, J. Climate, 31, 297-315, 2018. Journal Site
• Masunaga, R., H. Nakamura, H. Kamahori, K. Onogi, S. Okajima: The JRA-55CHS: An atmospheric reanalysis constructed with high-resolution sea surface temperature, SOLA, 14, 6-13, 2018. PDF

• Okajima, S., H. Nakamura, K. Nishii, T. Miyasaka, A. Kuwano-Yoshida: Assessing the importance of prominent warm SST anomalies over the midlatitude North Pacific in forcing large-scale atmospheric anomalies during 2011 summer and autumn, J. Climate, 27, 3889-3903, 2014. Journal Site

Reports, etc (only publications in English are listed) †

• Hideharu Sasaki, Masami Nonaka, Akira Kuwano-Yoshida, Satoru Okajima, Yoshikazu Sasai (2014), Understanding Roles of Oceanic Fine Structures in Climate and Its Variability, Annual Report of the Earth Simulator Center April 2014, 9-13.

Awards †

• Yamamoto Award 2022 (Meteorological Society of Japan)
  For Okajima, S., H. Nakamura, Y. Kaspi: Cyclonic and anticyclonic contributions to atmospheric energetics, Scientific Reports, 11, 13202, 2021. Journal Site

Ph.D. Thesis †

• Mechanisms for the distinctive seasonality of the North Pacific transient eddy activity as revealed from comprehensive analysis with the Eulerian statistics and Lagrangian tracking method UTokyo Repository

Proceedings (only presentations in English are listed) †

• Satoru Okajima, Hisashi Nakamura, Thomas Spengler: Midlatitude Oceanic Fronts Strengthen the Moisture Transport from Anticyclones to Cyclones, Bergen-ArCSII Join Workshop on storm tracks and atmosphere-ocean-ice interactions (Tokyo, 2024.03)
• Satoru Okajima, Hisashi Nakamura, Thomas Spengler: Midlatitude Oceanic Fronts Strengthen the Moisture Transport from Anticyclones to Cyclones, Ocean Sciences Meeting 2024 (New Orleans, USA, 202402)

• Satoru Okajima, Migratory cyclone activity in springtime East Asia, The 2nd Workshop on the A3 Foresight Program "Networking Climate Change Research Hubs for Promoting Future Earth Over Northeast Asia" (Zhuhai, China, 2023.12)
• Satoru Okajima, H. Nakamura: A spring peak in the frequency of "south coast cyclones" along the Kuroshio, The International Workshop on "Communications on Future Changes of Extreme Weather with Reduced Uncertainty Based on Physical Understandings" (Chiba, 2023.11)
• Satoru Okajima, H. Nakamura, Y. Kaspi: Distinct roles of cyclones and anticyclones in setting the midwinter minimum of the North Pacific eddy activity: a Lagrangian perspective, The Role of Atmospheric Dynamics for Climate and Extremes; A Joint DynVar-SNAP Meeting (Munich. Germany, 2023.10)
• Satoru Okajima, H. Nakamura, Y. Kaspi: Anticyclonic suppression of the North Pacific transient eddy activity in midwinter, Japan-Israel Joint Symposium on Atmospheric Dynamics and Climate (Tokyo, 2023.09).
• Satoru Okajima, H. Nakamura, Y. Kaspi: Cyclonic and anticyclonic contributions to the midwinter minimum of the North Pacific storm-track activity. Part I. Lagrangian perspective, The 28th IUGG General Assembly (Berlin, 2023.07).
• Satoru Okajima, H. Nakamura, T. Spengler: Cyclonic and anticyclonic contributions to air-sea interactions around midlatitude oceanic frontal zones, The 28th IUGG General Assembly (Berlin, 2023.07).
• Satoru Okajima, H. Nakamura, Y. Kaspi: Anticyclonic suppression of the North Pacific transient eddy activity in midwinter, Mid-latitude Ocean-Atmosphere Interactions: Their Processes and Predictability (Toyama, Japan, 2023.06)
• Satoru Okajima, H. Nakamura: South coast cyclones along the Kuroshio: their seasonality and variability, SENTAN-Foresight Workshop on Tropical Climate Variability (Kanagawa, Japan, 2023.06)
• Satoru Okajima, H. Nakamura, Y. Kaspi: Transient eddy activity from multiple and "hybrid" perspectives, JpGU Meeting 2023 (Chiba, Japan, 2023.05), invited
• Satoru Okajima, H. Nakamura, T. Spengler: Cyclonic and anticyclonic contributions to air-sea interactions around midlatitude oceanic frontal zones, JpGU Meeting 2023 (Chiba, Japan, 2023.05)
• Satoru Okajima, H. Nakamura: A spring peak in the frequency of “south coast cyclones”along the Kuroshio,1st Joint Workshop on the A3 Foresight Program: Networking Climate Change Hubs for Promoting Future Earth Over Northeast Asia (Busan, South Korea, 2023.04), invited
• Satoru Okajima, H. Nakamura, T. Spengler: Cyclonic and Anticyclonic Contributions to Air-Sea Interactions around Midlatitude Oceanic Frontal Zones, Mesoscale and Frontal-Scale Air-Sea Interactions Workshop (Boulder, USA, 2023.03)
• Satoru Okajima, H. Nakamura, Y. Kaspi: Distinct seasonality in the frequency of migratory cyclones and anticyclones over the North Pacific, ISAR-7 (Online/Tokyo, Japan, 2023.03)

• Satoru Okajima, H. Nakamura, Y. Kaspi: A new look at atmospheric energetics: cyclonic and anticyclonic contributions and their interactions with the jet stream, AGU Fall Meeting 2022 (Oral, 2022.12), invited
• Satoru Okajima, H. Nakamura, Y. Kaspi:Understanding the seasonality of the North Pacific transient eddy activity, Asian Conference on Meteorology 2022 (Online, 2022.11), invited
• Satoru Okajima, Hisashi Nakamura, Yohai Kaspi: A new look at atmospheric energetics: cyclonic and anticyclonic contributions and their interactions with the jet stream, Storm Track Workshop 2022 (France, 2022.05, Oral)
• Satoru Okajima, Hisashi Nakamura, Yohai Kaspi:Cyclonic and anticyclonic contributions to atmospheric energetics, First NORPAN2–ArCS II Bilateral Workshop on the Arctic and Global Climate(Tokyo, 2022.03, Oral)

• Satoru Okajima, Hisashi Nakamura, Yohai Kaspi, Energetics of the midwinter suppression of the North Pacific storm-track activity, International workshop for mid-latitude air-sea interaction (Online, 2021.06)

• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Bunmei Taguchi, Masato Mori, Yu Kosaka, Characteristics and dynamics of seasonality of the North Pacific stormtrack, NORPAN Closing Workshop, Feb 2019, Kanagawa(Japan). (Oral)
• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Bunmei Taguchi, Masato Mori, Yu Kosaka, Mechanisms for Maintaining Basin-Scale Atmospheric Response to Decadal Variability of the North Pacific Oceanic Frontal Zone, JpGU Meeting 2018, May 2018, Chiba(Japan). (Poster)

• Satoru Okajima, Hisashi Nakamura, Ryusuke Masunaga ,Hirotaka Kamahori, Chiaki Kobayashi, Interannual modulations of the influence of North Pacific oceanic fronts on the atmosphere as revealed in the JRA-55 family, JpGU-AGU Joint Meeting 2017, May 2017, Chiba(Japan). (Oral)

• Satoru Okajima, Hisashi Nakamura, Ryusuke Masunaga ,Hirotaka Kamahori, Chiaki Kobayashi, Interannual modulations of the influence of North Pacific oceanic fronts on the atmosphere as revealed in the JRA-55 family, Workshop on global precipitation systems, November 2016, Yokohama(Japan). (Oral)
• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Bunmei Taguchi, Extratropical Frontal- and Meso-scale Air-Sea Interaction: Possibility and mechanism of atmospheric response to wintertime SST anomalies in the North Pacific frontal zone and its relationship to atmospheric internal variability, CLIVAR Open Science Conference, September 2016, Qingtao(China). (Poster)
• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Bunmei Taguchi, Wintertime atmospheric response to decadal SST anomalies in the North Pacific frontal zone and its relationship to dominant atmospheric internal variability, NORPAN kick-off meeting, May 2016, Tokyo(Poster)
• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Bunmei Taguchi, Wintertime atmospheric response to decadal SST anomalies in the North Pacific frontal zone and its relationship to dominant atmospheric internal variability, 26th Ocean Sciences Meeting, February 2016, New Orleans(USA). (Oral)

• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Bunmei Taguchi, Wintertime atmospheric response to decadal SST anomalies in the North Pacific frontal zone and its relationship to atmospheric internal variability, 26th IUGG General Assembly, June 2015, Prague (Czech Rep.). (Oral)
• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Assessing the importance of prominent warm SST anomalies and northward shift of oceanic frontal zone over the midlatitude North Pacific in forcing atmospheric anomalies in October, 95th AMS Anuual Meeting, January 2015, Phoenix(USA). (Oral)

• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Assessing the importance of prominent warm SST anomalies over the midlatitude North Pacific in forcing atmospheric anomalies during 2011 summer/autumn, AOGS 2014 Meeting, July 2014, Sapporo, Japan. (Oral)

• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Assessing the importance of prominent warm SST anomalies over the midlatitude North Pacific in forcing atmospheric anomalies during 2011 summer/autumn, 2014 Ocean Sciences Meeting, February 2014, Honolulu, The United States. (Poster)

• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Possible influence of prominent SST anomalies in October 2011 over the midlatitude North Pacific on the atmospheric circulation, Davos Atmosphere and Cryosphere Assembly 2013, July 2013, Davos, Switzerland. (Oral)

• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Possible Atmospheric Response to Prominent Warm SST Anomalies in the Midlatitude North Pacific during Summer/Autumn 2011, August 2012, Kunming, China. (Poster)

• Satoru Okajima, Hisashi Nakamura, Kazuaki Nishii, Takafumi Miyasaka, Akira Kuwano-Yoshida, Possible Atmospheric Response to Prominent Warm SST Anomalies in the Midlatitude North Pacific during Summer/Autumn 2011, 2012 JpGU Meeting, Chiba, May, 2012. (Poster)

Seminars etc. †

• Seminar in Florida State University, Tallahassee, USA, Transient eddy activity in midlatitudes: seasonality and air-sea interactions, 2024.02.14.
• Storm tracks meeting in University of Bergen, Norway, Cyclonic and anticyclonic contributions to air-sea interactions around midlatitude oceanic frontal zones, 2022.10.