Sentences with phrase «tuning against observations»

Note that the Russians validated their model tuning against observations — I think this is a major breakthrough.

Not exact matches

It is argued that uncertainty, differences and errors in sea ice model forcing sets complicate the use of models to determine the exact causes of the recently reported decline in Arctic sea ice thickness, but help in the determination of robust features if the models are tuned appropriately against observations.

• Lack of formal model verification & validation, which is the norm for engineering and regulatory science • Circularity in arguments validating climate models against observations, owing to tuning & prescribed boundary conditions • Concerns about fundamental lack of predictability in a complex nonlinear system characterized by spatio - temporal chaos with changing boundary conditions • Concerns about the epistemology of models of open, complex systems

Another point is that IEHO it is not easy to separate GCM results from observation, because the GCMs have been evaluated against observational data (note this is not tuning, this is sensitivity ananlysis in the broadest sense)

Models are often tuned by running them backwards against several decades of observation, this is much too short a period to correlate outputs with observation when the controlling natural quasi-periodicities of most interest are in the centennial and especially in the key millennial range.

For a complete discussion of this see Essex: https://www.youtube.com/watch?v=hvhipLNeda4 Models are often tuned by running them backwards against several decades of observation, this is much too short a period to correlate outputs with observation when the controlling natural quasi-periodicities of most interest are in the centennial and especially in the key millennial range.

The IPCC's detection and attribution method is meaningful to the extent that the models agree with observations against which they were not tuned and to the extent that the models agree with each other in terms of attribution mechanisms.

These models are routinely tested against, and in many cases tuned towards, observations of the modern Earth system.