Oka, A., H. Hasumi, and A. Abe-Ouchi (2012): The thermal threshold of the Atlantic meridional overturning circulation and its control by wind stress forcing during glacial climate, Geophysical Research Letters, acceptted.
Chikamoto, O. M., A. Abe-Ouchi, A. Oka, R. Ohgaito (2012): Quantifying the ocean's role in glacial CO2 reductions, Climate of the Past, doi:10.5194/cp-8-545-2012.
Chikamoto, O. M., L. Menviel, A. Abe-Ouchi, R. Ohgaito, A. Timmermann, Y. Okazaki, N. Harada, A. Oka (2012): Variability in North Pacific intermediate and deep water ventilation during Heinrich events in two coupled climate models, Deep Sea Research II, 61-64, 114-126.
Oka, A., E. Tajika, A. Abe-Ouchi, and K. Kubota (2011): Role of ocean in controlling atmospheric CO2 concentration in the course of global glaciations, Climate Dynamics, 37, 1755-1770.
Oka, A., A. Abe-Ouchi., M. Chikamoto, and T. Ide (2011): Mechanisms controlling export production at the LGM: effects of changes in oceanic physical fields and atmospheric dust deposition, Global Biogeochemical Cycles, 25, GB2009, doi:10.1029/2009GB003628.
Tachiiri, K., J. C. Hargreaves, J. D. Annan, A. Oka, A. Abe-Ouchi, and M. Kawamiya (2010): Development of a system emulating the global carbon cycle in Earth system models, Geoscience model developement, 3, 365-376.
Oka, A., H. Hasumi, H. Obata, T. Gamo, and Y. Yamanaka (2009): Study on vertical profiles of rare earth elements by using an ocean general circulation model, Global Biogeochemical Cycles, 23, GB4025, doi:10.1029/2008GB003353.
Oka, A., S. Kato, and H. Hasumi (2008): Evaluating effect of ballast mineral on deep-ocean nutrient concentration by using an ocean general circulation model, Global Biogeochemical Cycles, 22, doi:10.1029/2007GB003067.
Oka, A., H. Hasumi, N. Okada, T. T. Sakamoto, and T. Suzuki (2006): Deep convection seesaw controlled by freshwater transport through the Denmark Strait. Ocean modelling, 15(3-4), 157-176.
Oka, A., and H. Hasumi (2006): Effects of model resolution on salinity transport through northern high-latitude narrow passages and the Atlantic meridional overturning circulation, Ocean modelling, 13(2), 126-147.
R. J. Stouffer, J. Yin, J. M. Gregory, K. W. Dixon, M. J. Spelman, W. Hurlin, A. J. Weaver, M. Eby, G. M. Flato, H. Hasumi, A. Hu, J. Jungclause, I. V. Kamenkovich, A. Levermann, M. Montoya, S.Murakami, S. Nawrath, A. Oka, W. R. Peltier, D. Y. Robitaille, A. Sokolov, G. Vettoretti, N. Weber (2005): Investigating the causes of the response of the thermohaline circulation to past and future climate changes, Jornal of Climate, 19(8), 1365-1387.
Suzuki, T., H. Hasumi, T. T. Sakamoto, T. Nishimura, A. Abe-Ouchi, T. Segawa, N. Okada, A. Oka and S. Emori (2005): Future projection of sea level and its variability in a high resolution climate model, Geophysical Research Letters, 32(19), Art.No.L19706.
Suzuki, T., T.T.Sakamoto, T.Nishimura, N.Okada, S.Emori, A.Oka, and H.Hasumi (2005): Seasonal cycle of the Mindanao dome in the CCSR/NIES/FRCGC atmosphere ocean coupled model, Geophysical Research Letters, 32(17), Art.No.L19604.
J. M. Gregory, K. W. Dixon, R. J. Stouffer, A. J. Weaver, E. Driesschaert, M. Eby, T.Fichefet, H. Hasumi, A. Hu, J. H. Jungclaus, I. V. Kamenkovich, A. Levermann, M. Montoya, S. Murakami, S. Nawrath, A. Oka, A. P. Sokolov, R. B. Thorpe (2005): A model intercomparison of changes in the Atlantic thermohaline circulation in response to increasing atmospheric CO2 concentration, Geophysical Research Letters, 32(12), Art.No.L12703.
Oka, A., and H. Hasumi (2004): Effects of freshwater forcing on the Atlantic deep circulation: a study with an OGCM forced by two different surface freshwater flux datasets, Journal of Climate, 17(11), 2180-2194.
Oka, A., H. Hasumi and N. Suginohara (2001): Stabilization of thermohaline circulation by wind-driven and vertical diffusive salt transport, Climate Dynamics, 18(1), 71-83.
July 1, 2011, Merbouren, Australia, IUGG XXV 2011
Title: Two different modes of the Atlantic meridional overturning circulation corresponding to stadial and interstadial periods in glacial climate
Authors: A. Oka, A. Abe-Ouchi, and H. Hasumi.
July 2-13, 2007, Perugia, Italy, IUGG XXIV 2007
Title: Changes in ocean carbon cycle by weakening of the Atlantic meridional overturning circulation
Authors: A. Oka and H. Hasumi.
August 26, 2005, Cairns, Australia, 2005 IAG/IAPSO/IABO Joint Assenbly.
Title: Deep convection seesaw controlled by sea ice transport through the Denmark strait.
Authors: A. Oka, H. Hasumi, N. Okada, T. Sakamoto, and T. Suzuki.
June 23, 2004, Baltimore, USA, 1st International CLIVAR Science Conference: Understanting and Predicting Our Climate System.
Title: Effects of freshwater forcing on the Atlantic deep circulation: a study with an OGCM forced by two different surface freshwater flux datasets
Authors: A. Oka and H. Hasumi
June 30 - July 11, 2003, Sapporo, Japan. IUGG2003
Title: Role of salt transport through northern high-latitude narrow passages and sea surface freshwater forcing in the formation of the Atlantic deep circulation
Authors: A. Oka and H. Hasumi
国際学会(ポスター発表)
Apr 23, 2009, Vienna, Austria, EGU General Assembly
Title: Importance of control state for simulating the Atlantic deep circulation at the LGM.
Authors: A. Oka, H. Hasumi, and A. Abe-Ouchi.
Dec 15, 2008, San Francisco, USA, AGU fall meeting
Title: Simulation of the Atlantic deep circulation at the Last Glacial Maximum.
Authors: A. Oka, H. Hasumi, and A. Abe-Ouchi.
March 2-7, 2008, Orlando, Florida, The 14^th Ocean Science meeting
Title: Study on vertical profile of rare earth elements by using an ocean general circulation model.
Authors: A. Oka, H. Hasumi, H. Obata, T. Gamo, and Y. Yamanaka.
February 20-24, 2006, Hawaii, USA, The 13^th Ocean Sciences Meeting.
Title: Deep convection seesaw controlled by sea ice transport through the Denmark Strait.
Authors: A. Oka, H. Hasumi, N. Okada, T. Sakamoto, and T. Suzuki.
June 21-25, 2004, Baltimore, Maryland, USA, First International CLIVAR Science Conference "Understanding and Predicting our Climate System"
Title: Effects of freshwater forcing on the Atlantic deep circulation: a study with an OGCM forced by two different surface freshwater flux datasets.
Authors: A. Oka and H. Hasumi.
November 18-22, 2002, San Antonio, Texas, USA, WOCE AND BEYOND
Title: Role of interbasin water exchanges through narrow passages between the Atlantic Ocean , the GIN Seas and the Arctic Ocean in the formation of the Atlantic deep circulation.
Authors: A. Oka and H. Hasumi.
May 30-June 3, 2000, Wachinton, D.C., USA, AGU Spring Meeting
Title: Stabilization of Thermohaline Circulation by Wind-driven and Vertical Diffusive Salt Transport.
Authors: A. Oka, H. Hasumi, and N. Suginohara.
国際会議・シンポジウム・ワークショップ等(口頭発表)
December 7, 2009, Paris, France, 2nd GEOTRACES DATA/MODEL SYNERGY WORKSHOP
Title: Simulation of rare earth elements (REEs) with an ocean general circulation model.
Authors: A. Oka, H. Hasumi, H. Obata, T. Gamo, and Y. Yamanaka.
November 9-13, 2008, Miami, USA, IMBER IMBiZO
Title: Evaluating effect of ballast mineral on deep-ocean nutrient concentration by using an ocean general circulation model.
Authors: A. Oka, S. Kato, and H. Hasumi.
January 2008, 31, Tokyo, Japan, 2008 SHOTS Workshop.
Title: Evaluating effect of ballast mineral on deep-ocean nutrient concentration by using an ocean general circulation model.
Authors: A. Oka, S. Kato, and H. Hasumi.
January 2008, 15-18, Hamburg, Germany, JSPS-DFG Round Table on Climate System Research Status and Perspective.
Title: Simulation of the Atlantic meridional overturning circulation at the Last Glacial Maximum.
Authors: A. Oka, H. Hasumi, and A. Abe-Ouchi.
December 3-4, 2007, Tokyo, Japan, The 21th Century Symposium: Predictability of the Evolution and Variation of the Multi-scale Earth System
Titile: Simulation of the Atlantic meridional overturning circulation in past and future climate changes.
Authors: A. Oka
November 6-9, 2006, Kitakyusyu, Japan, Northeastern Asian Symposium 2006 on Climate Change and Carbon Cycle
Title: Response of the Atlantic meridional overturning circulation to global warming and its effects on carbon cycle
Authors: A. Oka
November 14-16, 2006, Tsukuba, Japan, 2006 SHOTS (Southern Hemisphere Ocean Tracer Studies) Workshop
Title: Study on distribution of rare earth elements by using an OGCM.
Authors: A. Oka, H. Hasumi, H. Obata, T. Gamo, and Y. Yamanaka.
February 25, 2005, Honolulu, USA, The 2^nd International Workshop on the Kyousei Project and The 7^th International Workshop on Next Generation Climate Models for Advanced High Performance Computing Facilities.
Title: Multi-decadal variability of deep convection in Labrador Sea and Greenland Sea simulated in a coupled atmosphere and ocean general circulation model,
Authors: A. Oka, H. Hasumi, N. Okada, T. Sakamoto, and T. Suzuki.
February 25-27, 2004, Honolulu, USA, The 1^st International Workshop on the Kyousei Project.
Title: Simulation of the Atlantic deep circulation in an atmosphere and ocean general circulation model
Authors: Akira Oka, Hiroyasu Hasumi, Ayako Abe-Ouchi, Rumi Ohgaito, Naosuke Okada, Masahide Kimoto
国際会議・シンポジウム・ワークショップ等(ポスター発表)
September 6-8, 2007, Delmenhorst, Germany, GEOTRACES Data-Model Synergy Workshop.
Title: Study on vertical profiles or rare earth elements by using an ocean general circulation model.
Authors: A. Oka, H. Hasumi, H. Obata, T. Gamo, and Y. Yamanaka.
September 15, 2004, Keil, Germany, CLIVAR Workshop on Atlantic Thermohaline Circulation Variability.
Title: Variations of the THC in the CCSR/NIES/FRCGC coupled GCM for 20th century and future projection runs.
Authors: A. Oka, H. Hasumi, N. Okada, T. Sakamoto, and T. Suzuki.