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As of today, there is an incomplete understanding of the mechanisms that govern the behaviour of what is commonly referred to in the literature as the Pacific Decadal Oscillation, a major mode of climate variability that has been demonstrated to play a key role in the evolution of the climate at decadal time-scales, and has been shown to be correlated to the rate of change of global mean surface temperature. Over decades, we have developed our understanding of the PDO and recent work has examined the plausibility of whether anthropogenic aerosols could directly or otherwise modulate the behaviour of the PDO, with conflicting conclusions and therefore there is still a lack of a consensus. It is this incomplete understanding that forms the rationale for this project and which I strive to improved through the analysis and running of climate models.