Table 2.

Three-way combinations of contingent states

Three-way combinations of contingent states of ENSO (E), PDO (P), and AMO (A) during which observed fires were synchronous within regions (years with >5% of sites with synchronous fires, shown in diagonal cells that are enclosed in black lines) or between regions (fire years recorded at ≥1 site in each region, nondiagonal cells) above that expected by chance (bold, P < 0.01; italics, P < 0.05; normal, P < 0.10, χ² tests); +, warm phase; −, cold phase. All phase combinations occurred during the period analyzed (1700–1900). Phase combinations during which fire synchrony was not significantly above that expected by chance are not shown. The four significant phase combinations are color coded (gold, warm AMO, cold PDO, La Niña; blue, cold AMO, cold PDO, La Niña; green, cold AMO, warm PDO, El Niño; purple, cold AMO, warm PDO, La Niña).