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As to trapped gases in ice cores, the science that calculates the atmospheric concentrations from these ice cores is by no means settled. It is my understanding that there are arguments relating to almost everything to do with such correlations, including just how well are gases trapped, things such as slight melting and refreezing of the cores as they are laid down (something dehammer mentioned).
And is your ''understanding'' based on articles published in peer reviewed journals? And if so, do the conclusions of these articles have any significant influence on the reconstructed CO_2 and temperature record (deduced from oxygen isotopes)?