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The Pacific-South American (PSA) pattern is an important mode of climate variability in the mid-to-high southern latitudes. It is widely recognized as the primary atmospheric teleconnection by which the El Ni\~{n}o Southern Oscillation (ENSO) influences the south-east Pacific and south-west Atlantic and has been implicated in recent climatic trends over West Antartica and the Antarctic Peninsula. Despite this recognition, relatively little is known about the climatological characteristics of the pattern. We seek to address This study addresses  this issue via the development and application of a novel methodology for objectively identifying the pattern in from  ERA-Interim reanalysis data. By rotating the global coordinate system such that the equator (a great circle) traces the approximate path of the PSA pattern, our the  identification algorithm is able to utilize utilizes  Fourier analysis as opposed to traditional Empirical Orthogonal Function approaches. We find The resulting climatology reveals  that the PSA patternoften persists for months at a time, with an almost equal split between events that propagate (to the east) and those that remain stationary. The pattern  has a strong influence on temperature and precipitation variability over West Antarctica and the Antarctic Peninsula, Peninsula  and on sea ice variability in the adjacent Amundsen, Bellingshausen and Weddell Seas. Trends The identified trend  towards the negative polarity of the PSA  pattern during autumn are is  consistent with warming observed over the Antarctic Peninsula during that season, however a similar (but not significant) trend during winter is inconsistent with warming observed over West Antarctica. Only a weak relationship is identified between the PSA pattern and ENSO,