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Changes in the intra-annual cycle of atmospheric CO 2 at Mauna Loa, Hawaii, are investigated by comparing monthly observations to the mean value of each year's waxing and waning phase of the cycle. Results identify a previously unnoticed change between 1965 and 2004 during October in which October concentrations declined relative to the cycle's mean value. Results confirm a previously noted change in spring (April), but unlike previous analyses, this result indicates that between 1965 and 2004doi:10.1175/ei224.1 fatcat:j4xqbikoc5bxxoypcfsedre6ku