Abstract
Interannual time-scale associations between fire occurrence and drought indices, the Southern Oscillation, and other synoptic patterns demonstrate that large-scale, long-term atmospheric features are precursors to regional fire activity. However, our knowledge of fire-climate relations over longer (century) timescales is fragmentary because of the rarity of comparable climate and fire time-series with sufficient resolution, length and regional extent. In this study, we develop reconstructions of wildfire occurrence from tree-ring data collected from northwestern New Mexico to compare with a millennium-length dendroclimatic reconstruction of precipitation. Reconstructions of both wildfires and climate show simultaneous changes since AD 1700 that indicate climate forcing of wildfire regimes on interannual to century timescales. Following a centuries-long dry period with high fire frequency (c. AD 1400-1790), annual precipitation increased, fire frequency decreased, and the season of fire shifted from predominantly midsummer to late spring. We hypothesize that these shifts in fire regimes reflect long-term changes in rainfall patterns associated with changes in synoptic-scale atmospheric circulation patterns and the Southern Oscillation. Our evidence supports century-scale climate forcing of fire regimes in the American Southwest, providing a useful analogue of future wildfire regimes expected under changing global climate conditions.
Original language | English (US) |
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Pages (from-to) | 213-220 |
Number of pages | 8 |
Journal | Holocene |
Volume | 10 |
Issue number | 2 |
DOIs | |
State | Published - Jan 1 2000 |
Keywords
- Climatic change
- Dendrochronology
- El Malpais National Monument
- Fire history
- Southwestern USA
- Tree-rings
ASJC Scopus subject areas
- Global and Planetary Change
- Archaeology
- Ecology
- Earth-Surface Processes
- Palaeontology