logging in or signing up MeyerTNCfireworkshop 2005 Stefanie Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 19 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 22, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Slide1: Long-term climate variation and fire in western conifer landscapes: relevance to establishing reference conditions Grant A. Meyer Jennifer Pierce Department of Earth and Planetary Sciences University of New MexicoSlide2: 2002 fire perimeters Yellowstone: cool-moist lodgepole pine-mixed conifer Central Idaho: warm-dry ponderosa pine Sacramento Mountains: ponderosa-mixed conifer…Slide3: Central Idaho ponderosa: presettlement regime of light surface fires, RI 5-30 yr Yellowstone lodgepole-mixed conifer: large, severe stand-replacing fires, RI 200-400 yrSlide4: Rill and channel erosion (1988 fire, 1989 storm, Yellowstone) Loss of root strength, saturation-failure of colluvium (1989 fire, 1997 storm, Idaho) Initiation of debris flow-flood events through runoff and sediment bulkingSlide5: 1989 debris flow-dominated event, NE YellowstoneSlide6: 1989 debris flow older fan sediments 1988 charred litter layer (burned soil surface)Slide7: burned soil surface layer, 1870 ± 70 14C yr BP probable fire-related debris flow ALLUVIAL-FAN STRATIGRAPHIC SECTIONS, NE YELLOWSTONE tape in metersSlide8: Radiocarbon-dated fire-related sedimentation events, YellowstoneYellowstone, Midway Geyser Basin: Yellowstone, Midway Geyser Basin 1871 1971Slide13: Central Idaho ponderosa: presettlement regime of light surface fires, RI 5-30 yrSlide14: Central Idaho alluvial fan records frequent (RI 33-80 yr) small fire-induced sedimentation events, 7400-6600 cal yr BPSlide15: Small events from low-moderate severity fires, Idaho ponderosa calendar year before present (cal. yr BP)Slide16: fire-related debris flow, 928 ± 34 14C yr BP ALLUVIAL-FAN SECTION GJ1, SOUTH FORK PAYETTE RIVER BASIN, IDAHOLarge debris flows from severe fires, Idaho ponderosa: Large debris flows from severe fires, Idaho ponderosa Distribution of large (orange) vs. small fire-related events, central Idaho ponderosa (Pierce et al. 2004) : Distribution of large (orange) vs. small fire-related events, central Idaho ponderosa (Pierce et al. 2004) Medieval “warm period” or “climatic anomaly”, 900-1300 AD Tree-ring reconstruction of drought areain the West (Cook et al., 2004): Tree-ring reconstruction of drought area in the West (Cook et al., 2004) (AD)Slide20: Fire-related debris flows in Yellowstone lodgepole – mixed conifer Tree-ring reconstruction of drought area in the West (Cook et al., 2004) (AD)Slide21: Frequent small events in Idaho ponderosa Tree-ring reconstruction of drought area in the West (Cook et al., 2004) (AD)Comparison of long-term and recent droughts in the West (Cook et al., 2004): Comparison of long-term and recent droughts in the West (Cook et al., 2004)Sacramento Mountains study area: Sacramento Mountains study areaSlide24: Tributary basin burned in Peñasco fire, with subsequent debris flowSlide25: Older fire-related debris flow deposit, Rio Peñasco tributary: 1670-1950 AD (??)Alluvial fan sediments along the Rio Peñasco: Alluvial fan sediments along the Rio PeñascoSlide28: Northern Hemisphere temperature reconstructions (Briffa and Osborn, 2002) “Medieval Warm Period” “Little Ice Age”Slide29: constant emissions at year 2000 level emissions required to stabilize CO2 at 550 ppm = 2xCO2Slide30: Conclusions Fire regimes are strongly influenced by climate change on millennial timescales Severe stand-replacing fires may be rare in ponderosa ecosystems, but are not likely outside of natural variability Along with increased stand densities, 20th-century warming is a major factor in recent catastrophic fires Future warming and increased drought severity are likely to to further increase the probability of catastrophic fires Reference conditions based on post-1500 AD tree-ring records and mid-1800s historical information may not accurately reflect important current and future climatic controls You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
MeyerTNCfireworkshop 2005 Stefanie Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 19 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 22, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Slide1: Long-term climate variation and fire in western conifer landscapes: relevance to establishing reference conditions Grant A. Meyer Jennifer Pierce Department of Earth and Planetary Sciences University of New MexicoSlide2: 2002 fire perimeters Yellowstone: cool-moist lodgepole pine-mixed conifer Central Idaho: warm-dry ponderosa pine Sacramento Mountains: ponderosa-mixed conifer…Slide3: Central Idaho ponderosa: presettlement regime of light surface fires, RI 5-30 yr Yellowstone lodgepole-mixed conifer: large, severe stand-replacing fires, RI 200-400 yrSlide4: Rill and channel erosion (1988 fire, 1989 storm, Yellowstone) Loss of root strength, saturation-failure of colluvium (1989 fire, 1997 storm, Idaho) Initiation of debris flow-flood events through runoff and sediment bulkingSlide5: 1989 debris flow-dominated event, NE YellowstoneSlide6: 1989 debris flow older fan sediments 1988 charred litter layer (burned soil surface)Slide7: burned soil surface layer, 1870 ± 70 14C yr BP probable fire-related debris flow ALLUVIAL-FAN STRATIGRAPHIC SECTIONS, NE YELLOWSTONE tape in metersSlide8: Radiocarbon-dated fire-related sedimentation events, YellowstoneYellowstone, Midway Geyser Basin: Yellowstone, Midway Geyser Basin 1871 1971Slide13: Central Idaho ponderosa: presettlement regime of light surface fires, RI 5-30 yrSlide14: Central Idaho alluvial fan records frequent (RI 33-80 yr) small fire-induced sedimentation events, 7400-6600 cal yr BPSlide15: Small events from low-moderate severity fires, Idaho ponderosa calendar year before present (cal. yr BP)Slide16: fire-related debris flow, 928 ± 34 14C yr BP ALLUVIAL-FAN SECTION GJ1, SOUTH FORK PAYETTE RIVER BASIN, IDAHOLarge debris flows from severe fires, Idaho ponderosa: Large debris flows from severe fires, Idaho ponderosa Distribution of large (orange) vs. small fire-related events, central Idaho ponderosa (Pierce et al. 2004) : Distribution of large (orange) vs. small fire-related events, central Idaho ponderosa (Pierce et al. 2004) Medieval “warm period” or “climatic anomaly”, 900-1300 AD Tree-ring reconstruction of drought areain the West (Cook et al., 2004): Tree-ring reconstruction of drought area in the West (Cook et al., 2004) (AD)Slide20: Fire-related debris flows in Yellowstone lodgepole – mixed conifer Tree-ring reconstruction of drought area in the West (Cook et al., 2004) (AD)Slide21: Frequent small events in Idaho ponderosa Tree-ring reconstruction of drought area in the West (Cook et al., 2004) (AD)Comparison of long-term and recent droughts in the West (Cook et al., 2004): Comparison of long-term and recent droughts in the West (Cook et al., 2004)Sacramento Mountains study area: Sacramento Mountains study areaSlide24: Tributary basin burned in Peñasco fire, with subsequent debris flowSlide25: Older fire-related debris flow deposit, Rio Peñasco tributary: 1670-1950 AD (??)Alluvial fan sediments along the Rio Peñasco: Alluvial fan sediments along the Rio PeñascoSlide28: Northern Hemisphere temperature reconstructions (Briffa and Osborn, 2002) “Medieval Warm Period” “Little Ice Age”Slide29: constant emissions at year 2000 level emissions required to stabilize CO2 at 550 ppm = 2xCO2Slide30: Conclusions Fire regimes are strongly influenced by climate change on millennial timescales Severe stand-replacing fires may be rare in ponderosa ecosystems, but are not likely outside of natural variability Along with increased stand densities, 20th-century warming is a major factor in recent catastrophic fires Future warming and increased drought severity are likely to to further increase the probability of catastrophic fires Reference conditions based on post-1500 AD tree-ring records and mid-1800s historical information may not accurately reflect important current and future climatic controls