However, when the majority of lakes in a region fluctuate in a similar way, then these fluctuations can only be climatically controlled. These regional patterns can be used to reconstruct sub-continental to global variations in the hydrological cycle and can be interpreted as shifts in atmospheric circulation patterns. Gridded mapped patterns of these variations objectively eliminate local variations and permit more accurate comparisons of gridded GCM outputs. Using the geostatistical approach, regional patterns were objectively identified by examining the spatial correlation between sites at different spatial and temporal scales. The modelling and gridding of lake status was performed using indicator kriging at 3,000 year intervals during the Holocene.
Results show coherent regional patterns, thus suggesting robust estimations.
The general tendencies show that 0 and 6 ka are more spatially correlated than 3 and 9 ka which are here suggested as transitional periods.