Syukuro Manabe

Record year1964–1967

summaryIt organized radiative processes, convective adjustment, and relative-humidity assumptions into computable equilibrium models, and used counterfactuals of CO2 concentration and water-vapor feedback to show vertical temperature responses.

M rationaleM6.3 is assigned to a foundational numerical method capable of reconstructing how climate questions are expressed and experimented on: it is not merely a curve fit, but turns atmospheric physical processes into a reusable framework of CO2 and feedback counterfactuals. It is below broader general theories such as information theory M7, because its object remains a one-dimensional equilibrium climate column and its principal social downstream effects are excluded.

attribution rationaleManabe 0.47, Wetherald 0.22; prior work in atmospheric physics 0.12; GFDL programming/computation and research support 0.10; early comparison and dissemination 0.04; specific division of labor unresolved 0.05. Shares are judgments of responsibility and do not arise automatically from a Nobel Prize or author order.

overlap boundaryThe mid-1960s one-dimensional radiative–convective column model, the 1964 convective-adjustment method, and the 1967 temperature-profile experiments at different CO2 concentrations with and without water-vapor feedback. Only the foundational numerical method for vertical atmosphere–surface equilibrium, CO2 response, and water-vapor feedback is counted; three-dimensional GCMs, ocean–atmosphere coupling, all modern climate-sensitivity estimates, policy, and IPCC conclusions are excluded.

Evidence gapsThe full texts of the 1964 and 1967 papers are needed to check model equations, assumptions, and experimental boundaries; contemporaneous materials are needed to disaggregate the specific roles of Manabe, Wetherald, and the GFDL programming/computation team; the scope of subsequent observational validation has not yet been closed for this item, which does not affect the provisional estimate but limits its use as a precise anchor.

Record year1965–1975

summaryIt integrated dynamics, radiation, vertical transport, and the hydrological cycle into a global three-dimensional climate model, and in the mature chain turned CO2 doubling into experiments on spatial distributions and circulation responses.

M rationaleM6.5 reflects a delivered numerical-experiment platform for global climate and its key CO2 counterfactual, broader in scope than a single model paper and Pearl Street-style local infrastructure, but still below general information theory M7. Chaining the 1965 system and 1975 experiments avoids having the same GCM base counted twice as both 'model' and 'application'.

attribution rationaleManabe 0.32; Smagorinsky 0.19; Holloway 0.07; Wetherald 0.12; GFDL dynamics, programming, computation, and data team 0.13; prior work in numerical weather prediction/GCMs 0.10; institutional support and early validation 0.03; unresolved 0.04.

overlap boundaryThe 1965 global-atmosphere model of primitive equations, vertical fluxes, radiation, and the hydrological cycle, together with the 1975 experiment comparing doubled CO2 in a three-dimensional general circulation model, as a mature chain from a model system to a key climate-forcing experiment. The 1975 experiment consumes the 1965 model and the 1967 radiative–convective physics and does not establish a separate complete model M; ocean coupling, later model versions, all global-warming predictions, and institutional outcomes are excluded.

Evidence gapsThe full original papers from 1965 and 1975 are needed to check experimental configurations, delivered results, and the unique increment of the two stages; model code, technical reports, or contemporaneous retrospectives are needed to disaggregate the roles of Smagorinsky, Manabe, Holloway, Wetherald, and the programming team; independent validation materials are needed to calibrate the actual scope of this system's use in contemporaneous and subsequent climate research.

Record year1969–1991

summaryIt linked dynamic ocean and atmosphere processes with land processes into a long-term climate-experiment system, and used gradual CO2 experiments to reveal the ocean's role in response rates and spatial distributions.

M rationaleM6.4 is assigned to cross-medium ocean–atmosphere–land coupling and an operational transient-experiment chain. The independent increment lies in ocean feedback, response lag, and spatial distribution; the complete value of the atmospheric GCM base is consumed by the preceding item. It is a climate-system method with a definite object and is not credited with all modern Earth-system predictions; no points are added or deducted for development taking a long time.

attribution rationaleManabe 0.26, Bryan 0.18, Stouffer 0.12, Spelman 0.08; GFDL team 0.15; existing atmospheric/ocean models and prior work on coupling 0.12; comparative dissemination 0.04; unresolved 0.05.

overlap boundaryThe 1969 Manabe–Bryan idealized ocean–atmosphere–land coupled model, through the 1991 chain of coupled experiments with realistic geography and seasonal variation that studied the ocean's effect on the rate and spatial distribution of change as CO2 gradually rose or fell. The atmospheric GCM is an input and its complete M is not counted twice; every intermediate version, modern Earth-system models, and all sea-level or policy outcomes are excluded.

Evidence gapsThe full papers of 1969 and 1991 are needed to check the coupling method, stages of realism, and independent additions in the transient experiments; team archives are needed to disaggregate responsibility for ocean code, coupling, land surface, computation, and experiment analysis; flux adjustment, drift, resolution, and the scope of testing against the real ocean require unified rechecking.

Record year1988

summaryIn a global coupled model, it turned different stable circulation states and the possibility of transitions into testable experimental questions.

M rationaleM5.2 corresponds to an internationally important climate-dynamics diagnostic: it goes beyond a local numerical result, but does not constitute a new complete model platform. The possibility that flux adjustment affects stability is an inseparable methodological limitation and prevents placement in a higher foundational-framework tier.

attribution rationaleManabe and Stouffer 0.35 each; previously counted coupled-platform input 0.12; GFDL team 0.08; original experimental inputs awaiting analysis 0.04; unresolved 0.06. Author order is not used to manufacture asymmetric shares.

overlap boundaryThe 1988 report of multiple stable equilibrium states and associated Atlantic overturning-circulation behavior in a global coupled atmosphere–ocean model. Only the multistability diagnostic and experimental knowledge are counted; the coupled-model platform itself belongs to the 1969–1991 family, while modern AMOC observations, forecasts, and all tipping-point research are excluded.

Evidence gapsThe full original 1988 paper is needed to check the experimental design, definition of stable states, and the division of labor between the two authors; the model dependence produced by flux adjustment must be distinguished from transferable physical conclusions; later AMOC commentators are not automatically counted as co-creators of the original 1988 research; the originally listed shares remain unresolved.

Record year1985

summaryIt used continental ice sheets as controlled forcing inputs to a global climate model, isolating their numerical impact on glacial climate.

M rationaleM4.8 is assigned to a complete but object-limited international paleoclimate numerical experiment. It has an independent scientific outcome and is not reduced to zero because it consumes a GCM; the static mixed-layer ocean and the specific 18 ka boundary place it below more general climate diagnostics or platforms rated M5 or higher.

attribution rationaleManabe and Broccoli 0.34 each; previously counted model inputs 0.10; GFDL computation, paleodata, and research support 0.12; ice-sheet boundaries/prior work in paleoclimate 0.05; unresolved 0.05.

overlap boundaryThe 1985 comparison, using an atmospheric GCM coupled to a static mixed-layer ocean, of modern and approximately 18 ka continental-ice-sheet boundary conditions to study ice-sheet effects on glacial climate. Only this family of paleoclimate-forcing experiments is counted; the existing GCM platform, all last-glacial reconstructions, dynamic ice sheets, the modern paleoclimate field, and successor simulations are excluded.

Evidence gapsThe full original 1985 paper is needed to check specific experimental results, boundary conditions, and the Broccoli/Manabe division of labor; independent paleoclimate data are needed to judge the scope of agreement between model results and real reconstructions.