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<br />Indices of Fire Frequency in western U.S. <br />(241 fire-scar chronologies compared to <br />50-yr moving average of AMO <br /> <br />- AMO reconstruction SOyr moving avg. <br /> <br />- Total fire synchrony <br /> <br />- 1 - (SW.PNW Bipolarity) <br /> <br />Kitzberger, Swetnam, Veblen, Brown & <br />Heyerdahl, in prep. <br /> <br />1.0 <br /> <br />0.5 <br /> <br />x <br />w 0.0 <br />o <br />z <br /> <br />-0.5 <br /> <br />-1.0 <br /> <br />- Nothern extent of SWUS synchrony <br /> <br />- SNE-SWUS synchrony <br /> <br /> <br />1550 <br /> <br />1600 <br /> <br />1650 <br /> <br />1700 <br /> <br />1750 <br /> <br />1800 <br /> <br />1850 <br /> <br />1900 <br /> <br />1950 <br /> <br />~USGS <br />_ilDr......_ <br />