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Record 1 2012-03-01


Subject field(s)
  • Climate Warming and Ozone Layer

Signal detectables above the noise of natural climatic variation, which indicates a significant change in a climate parameter attributed to an increase in atmospheric carbon dioxide concentrations.


The signal may be estimated by numeric modeling of the climate, and the noise can be estimated using instrumental data. For any modeled signal that is estimated, the corresponding noise can be estimated from observational data, and a signal-to-noise ratio can be calculated to provide a quantitative measure of detectability.


The problem is the last hundred years, the noise, the bouncing around of the climate due to natural processes, is so large that we are just now at the threshold of seeing what we call the signal emerging from that background noise.


  • Réchauffement climatique et couche d'ozone

Savons-nous aujourd'hui prévoir l'impact des variations climatiques qui risquent de se produire demain et après-demain? Devrions-nous et pouvons-nous déjà observer, aujourd'hui, les premiers signes du réchauffement climatique annoncé par les modèles?


Les termes «indice, indicateur et empreinte» sont parfois employés comme synonymes bien que chacun de ces termes puisse exprimer des nuances qu'il est préférable de faire ressortir dans les textes sur le réchauffement climatique.


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