Sam Sherriff-Tadano, Ayako Abe-Ouchi, Akira Oka, Takahito Mitsui, and Fuyuki Saito (2021) : Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials?: Implications from hosing experiments, Climate of the Past, in revision.
F. Lhardy, N. Bouttes, D. M. Roche, A. Abe-Ouchi, Z. Chase, K. A. Crichton, R. Ivanovic, M. Jochum, M. Kageyama, H. Kobayashi, L. Menviel, J. Muglia, R. Nuterman, A. Oka, G. Vettoretti, A. Yamamoto (2021): A firrst intercomparison of the simulated LGM carbon results within PMIP-carbon: role of the ocean boundary conditions, Paleoceanography and Paleoclimatology, in revision.
Sasaki, Y., Kobayashi, H., & Oka, A. (2021): An investigation into the processes controlling the global distribution of dissolved 231 Pa and 230 Th in the ocean and the sedimentary 231 Pa/230 Th ratios by using an ocean general circulation model COCO ver4.0. Geoscientific Model Development Discussions, 1-37.
Ando, T. and A. Oka (2021): Hysteresis of the glacial Atlantic Meridional Overturning Circulation controlled by thermal feedbacks, Geophysical Research Letters, submitted.
Oka, A., A. Abe-Ouchi, S. Sherriff-Tadano, Y. Yokoyama, K. Kawamura,and H. Hasumi (2021) : Glacial mode shift of the Atlantic meridional overturning circulation by warming over the Southern Ocean. Commun Earth Environ 2, 169 (2021). https://doi.org/10.1038/s43247-021-00226-3.
Masuda, Y., Y. Yamanaka, S. L. Smith, T. Hirata, H. Nakano, A. Oka, H. Sumata (2021) : Photoacclimation by phytoplankton determines the distribution of global subsurface chlorophyll maxima in the ocean. Commun Earth Environ 2, 128, https://doi.org/10.1038/s43247-021-00201-y.
A. Oka, H. Tazoe, and H. Obata (2021) : Simulation of global distribution of rare earth elements in the ocean using an ocean general circulation model, Journal of Oceanography, 1-18.
S. Sherriff-Tadano, A. Abe-Ouchi, and A. Oka (2021) : Impact of mid-glacial ice sheets on deep ocean circulation and global climate, Climate of the Past 17 (1), 95-110.
A. Oka (2020) : Ocean carbon pump decomposition and its application to CMIP5 earth system model simulations, Progress in Earth and Planetary Science 7 (1), 1-17.
AH MacDougall et al. [A.Oka listed in 21th author] (2020) : Is there warming in the pipeline? A multi-model analysis of the Zero Emissions Commitment from CO2, Biogeosciences 17 (11), 2987-3016.
Y. Nakamura and A. Oka (2019) : CMIP5 model analysis of future changes in ocean net primary production focusing on differences among individual oceans and models, Journal of Oceanography, Journal of Oceanography 75 (5), 441-462.
A. Yamamoto, A. Abe-Ouchi, R. Ohgaito, A. Ito, and A. Oka (2019) : Glacial CO2 decrease and deep-water deoxygenation by iron fertilization from glaciogenic dust, Climate of the Past 15 (3), 981-996.
H. Kobayashi and A. Oka (2018) : The response of atmospheric pCO2 to the glacial changes in the Southern Ocean amplified by the carbonate compensation process, Paleoceanography and Paleoclimatology 33 (11), 1206-1229.
M. Yoshimori, A. Abe-Ouchi, H. Tatebe, T. Nozawa, and A. Oka (2018) : The importance of ocean dynamical feedback for understanding the impact of mid-high latitude warming on tropical precipitation change, Journal of Climate, Journal of Climate 31 (6), 2417-2434.
S. Sherriff-Tadano, A. Abe-Ouchi, M. Yoshimori, A. Oka, and W. Chan (2018) : Influence of glacial ice sheets on the Atlantic meridional overturning circulation through surface wind change under glacial climate, Climate dynamics 50 (7-8), 2881-2903.
M. Shigemitsu, A. Yamamoto, A. Oka, and Y. Yamanaka (2017) : Uncertainty in CMIP5 future projetions of the ocean volume coccupied by low-oxygenated waters in the Eastern Tropical Pacific , Global Biogeochemical Cycles, doi:10.1002/2016GB005447.
A. Oka and M. Watanabe (2017) : The post-2002 global surface warming slowdown caused by the subtropical Southern Ocean heating acceleration, Geophysical Research Letters, 44, doi:10.1002/2016GL072184.
Dome Fuji Ice Core Project Members [A.Oka listed in 37th author] (2017): State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling. Science advances3, e1600446.
M. Yoshimori, M. Watanabe, H. Shiogama, A. Oka, A. Abe-Ouchi, R. Ohgaito, and Y. Kamae (2016) : A review of progress towards understanding the transient global-mean surface temperature response to radiative perturbation, Progress in Earth and Planetary Science 3 (1), 21
M. Shigemitsu, N. Gruber, A. Oka, and Y. Yamanaka (2016) : Potential use of the N2/Ar ratio as a constraint on the oceanic fixed nitrogen loss, Global Biogeochemical Cycles, 30(4), 576-594.
Yamamoto, A., A. Abe-Ouchi, M. Shigemitsu, A. Oka, K. Takahashi, R. Ohgaito, Y. Yamanaka (2015): Global deep ocean oxygenation by enhanced ventilation in the Southern Ocean under long-term global warming, Global Biogeochemical Cycles, 29(10), 1801-1815.
Kobayashi, H., A. Abe-Ouchi, and A. Oka (2015): Role of Southern Ocean stratification in glacial atmospheric CO2 reduction evaluated by a three-dimensional ocean general circulation model, Paleoceanography, 30, doi:10.1002/2015PA002786.
Kusahara, K., T. Sato, A. Oka, T. Obase, R. Greve, A. Abe-Ouchi, and H. Hasumi (2015): Modelling Antarctic marine cryosphere at the Last Glacial Maximum, Annals of Glaciology, 56(69), 425.
Liu , G., K. Kojima, K. Yoshimura, and A. Oka (2014): Proxy interpretation of coral-recorded seawater δ18O using 1D model forced by isotope-incorporated GCM in tropical oceanic regions, Journal of Geophysical Research: Atmospheres, 119(21), 12021-12033.
Yoshimori, M., A. Abe-Ouchi, M. Watanabe, A. Oka, and T. Ogura (2014): Robust seasonality of Arctic warming processes in two different versions of MIROC GCM, Journal of Climate , 27(16), 6358-6375.
Yamamoto, A., Y. Yamanaka , A. Oka, and A. Abe-Ouchi (2014): Ocean oxygen depletion due to decomposition of submarine methane hydrate, Geophysical Research Letter , 41(14), 5075-5083.
Ba, J., N. Keenlyside, M. Latif, W. Park, H. Ding, K. Lohmann, J. Mignot, M. Menary, O. H. Ottera, B. Wouters, D. Salas-Melia, A. Oka, A. Bellucci, E. Volodin (2014): A multi-model comparison for Atlantic multidecadal variability, Climate Dynamics, 43(9-10), 2333-2348.
Oka, A. and Y. Niwa (2013): Pacific deep circulation and ventilation controlled by tidal mixing away from the sea bottom, Nature Communications, 4:2419, doi:10.1038/ncomms3419.
Watanabe, M., Y. Kamae, M. Yoshimori, A. Oka, M. Sato, M. Ishii, T. Mochizuki, and M. Kimoto (2013): Strengthening of ocean heat uptake efficiency associated with the recent climate hiatus. Geophysical Research Letters, 40, 3175-3179, doi:10.1002/grl.50541.
Chikamoto, O. M., A. Abe-Ouchi, A.Oka, and S. Lan Smith (2012): Temperature-induced marine export production during glacial period, Geophysical Research Letters, 39, doi:10.1029/2012GL053828.
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, 39, doi:10.1029/2012GL051421.
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.
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.
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.
Suzuki, T., H. Hasumi, T. T. Sakamoto, T. Nishimura, A. Abe-Ouchi, T. Segawa, N. Okada, A. Oka and S. Emori (2005): Projection of future 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.