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. 2007 Nov 15;363(1501):2317–2329. doi: 10.1098/rstb.2007.2202

Figure 5.

Figure 5

The Arctic Oscillation (AO). (a) Chart showing point correlations between Northern Hemisphere sea-level pressure (SLP) and Arctic Oscillation, based on the fire season (May–August) anomalies. Contour interval is 0.2. Note the most prominent patterns of positive AO—lows over the Arctic Ocean and a belt of highs at mid-latitudes, especially prominent in the north Atlantic. Data and software for the figure obtained from the NCEP/NCAR Reanalysis Project (Kalnay et al. 1996). (b) Summer (June–August) AO index, obtained from the National and Ocean and Atmospheric Administration (NOAA; http://www.cpc.noaa.gov/).