noaa-fire-16800 Bigio fire data from Haflin Canyon, San Juan Mountains - IMPD USHAF001 Bigio, E.R.; Swetnam, T.W.; Baisan, C.H. Bigio fire data from Haflin Canyon, San Juan Mountains - IMPD USHAF001 2014-07-09 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16800 Investigator E.R. Bigio Investigator T.W. Swetnam Investigator C.H. Baisan earth science paleoclimate fire history|tree ring tree demographic and injury and fire event code,wood,null,null,null,fire history|tree ring,null,null,C,FHX2 data format; refer to IMPD documentation for description of codes earth science paleoclimate fire history|tree ring age,null,null,null,null,fire history|tree ring,null,null,N,null earth science paleoclimate fire history fire scar dates geoscientificInformation drought PIPO Pinus ponderosa Douglas ex C. Lawson ponderosa pine western yellow pine 1570 AD 2002 AD 380 cal yr BP -52 cal yr BP Complete 37.365701 37.365701 -107.835488 -107.835488 2500 2500 Continent North America United States Of America Colorado Haflin Canyon>LATITUDE 37.365701>LONGITUDE -107.835488 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Bigio, E.R. 2013 PhD dissertation, University of Arizona 207 pages http://arizona.openrepository.com/arizona/handle/10150/311587 PhD dissertation, University of Arizona

In the past few decades, wildfires have increased in size and severity in the Southwest and across the western US. These recent trends in fire behavior are a drastic change in arid, ponderosa pine and mixed conifer forests of the Southwest compared with tree-ring records of fire history for the past ~ 400 years. This study presents a late Holocene record (~ 3,000 years) of fire history and related changes in fire regimes with climate variability over annual to multi-decadal time scales. Tree-ring and alluvial-sediment sampling sites were paired in four small, tributary basins located in the western San Juan Mountains of Colorado. In our study sites, tree-ring records show that fire return intervals were longer and fire behavior was more severe on the north-facing slopes with relatively dense mixed conifer stands. Increased fire barriers and steep topography decreased the fire frequency and extent relative to gentle terrain elsewhere in the range and leading to a lack of synchrony among fire years in different parts of the study area. The alluvial-sediment record showed four peaks in high-severity fire activity over the past 3,000 years ranging between 200 - 400 years in length. The timing of peaks coincided with decadal-length drought episodes and were often preceded by multiple decades of above average winter precipitation. The sampling of alluvial-sediment and tree-ring data allowed for site-level comparisons between recent alluvial deposits and specific fire years interpreted from the tree-ring records. We found good correspondence between the type of fire-related sediment deposit (i.e. geomorphic response) in the alluvial record and the extent of mixed and high-severity fire estimated from the tree-ring record, and the correspondence was well-supported by the debris flow probability model results. The two paleofire data tend to represent particular components of the historical fire regime, with alluvial-sediments biased towards infrequent, high-severity events during recent millennia, and the tree-ring record biased toward lower severity fires during recent centuries. The combined analyses of different paleofire proxy types in the same study sites, therefore, can enhance and expand our understanding of fire and climate history beyond what is possible with either proxy alone. STUDY NOTES: This site was chosen to correspond with alluvial-stratigraphy fire history sampling locations.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/ushaf001.txt More Information; ushaf001.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/ushaf001-fire-hist-graph.png Fire History Graph; ushaf001-fire-hist-graph.png GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/ushaf001-fire-hist-graph.pdf Fire History Graph; ushaf001-fire-hist-graph.pdf GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/ushaf001.fhx Fire Scar Data; ushaf001.fhx USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11