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Data synthesis

UoB developed a series of syntheses with respect to the northern paleoclimate time series with inputs from the other partners, in order to test the consistency of the results. The most robust methodology is the Threshold counting method employed by Osborn and Briffa (Science 2006). The data results from analyses of the last 1200 years displays a common, cross-basin signature of both the MWP and the LIA. The cold phases are common with the Northern Hemisphere reconstructions, and indicate strong volcanic forcing with cold events at about 1600 AD and 1800 AD.

The results so far indicate that the NAO-pattern is not a consistent pattern on multidecadal and longer time scales, but that it is probable that a more NAO-like sustained pattern was apparent during the Early Holocene time period based on the difference between the eastern and western basins. Analyses of the results strongly indicate that the Early Holocene warming was very different from the modern in that the modern is apparent both at surface and subsurface implying advective dynamics are important, and the early Holocene reflects the impacts of the insolation anomaly only in the surface layer.

Data sets are stored in project data base at BCCR. These will now be ported to the PANGEA data base and will be available for the new generation of transient model experiments under execution as part of several European initiatives (e.g. the Millennium initiative of the MPI-Hamburg (led by Johann Jungclaus). Further data-model analyses are planned with the transient model experiments for the. last millennium performed as part IPCC AR4, and with model experiments performed as part of the PMIP-2 program. These studies have been funded both in Norway, Switzerland and Germany, and secures that the PACLIVA data sets will become an integrated source for validation of millennium model experiments and for attribution studies relating climate forcing to responses in the ocean.

Related information

Result In Brief

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Bjerknes Centre for Climate Research
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