It is also instructive to examine the trends in different latitude bands. Overpeck et al. It is also instructive to compare hemispheric trends with other more regional temperature trends. In Figure 10, we show the reconstructed NH series along with an areal mean reconstruction over the North American region, during the past few centuries. The fluctuations are significantly greater on almost all timescales for the North American series, which is simply a consequence of the spatial sampling statistics of a smaller region.
Seasonal distinctions are also clearly important.
The impact of the NAO, and detailed regional inferences, are discussed in detail in the subsequent section. Figure 11 Comparison of European Temperature Trends Back to 1750 for cold and warm half-year seasonal windows.