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Patterns of climate variability in the north atlantic

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Reconstructing the climate of the Holocene

Research on the impact that climate variability of the North Atlantic Ocean has on climate change in Europe does not go far enough. It covers only the past one or two centuries at best. This study addressed this knowledge gap by providing a continual record from which glacier chronologies can be evaluated.

Climate Change and Environment icon Climate Change and Environment

The PACLIVA project tested patterns of climate variability at the decadal to century scale. Models which test and validate climate behaviour over time form the basis of climate prediction. This study identified the degree to which the oceanic anomaly patterns associated with the North Atlantic Oscillation reflect the long-term variability of North Atlantic climates. The scientists focused on precipitation reconstructions, because winter precipitation is a good indicator of past atmospheric variations. They based the study on the region of Scandinavia and analysed records of climate variation at Norwegian glaciers. The scientists calculated indices for a continuous time series of non-stationarity over the last six thousand years. They found evidence indicating that the atmosphere varied spatially and that circulation patterns varied on millennial time scales. The study also involved sediment samples collected from catchments of the St. Sorlin glacier at Lac Blanc in the south-eastern French Alps. The data compiled showed evidence of a climatic optimum, when little or no clastic glacier flour was deposited in the lake.

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