noaa-fire-2240 Heyerdahl fire data from Tucannon - IMPD USTUC001 Heyerdahl, E.K.; Brubaker, L.B.; Agee, J.K. Heyerdahl fire data from Tucannon - IMPD USTUC001 2001-01-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/2240 Investigator E.K. Heyerdahl Investigator L.B. Brubaker Investigator J.K. Agee 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 sample identification,null,null,null,null,,null,null,C,Tree ID 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|tree ring tree demographic and injury and fire event code,wood,null,null,null,fire history|tree ring,null,null,C,null earth science paleoclimate fire history fire scar dates earth science paleoclimate fire history establishment dates geoscientificInformation PIPO Pinus ponderosa Douglas ex C. Lawson ponderosa pine western yellow pine 1487 AD 1994 AD 463 cal yr BP -44 cal yr BP Complete 46.18 46.18 -117.6 -117.6 1462 1462 Continent North America United States Of America Washington Tucannon>LATITUDE 46.18>LONGITUDE -117.6 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 Heyerdahl, E.K., L.B. Brubaker, and J.K. Agee 2001 Ecology 82 660-678 Heyerdahl, E.K. 1997 Thesis Heyerdahl, E.K., L.B. Brubaker and J.K. Agee 2002 The Holocene 12 597-604 Heyerdahl, E.K. and S.J. McKay 2001 Tree-Ring Research 57 131-139 Heyerdahl, E.K. and S.J. McKay 2008 Tree-Ring Research 64 61-64

Our objective was to infer the controls of spatial variation in historical fire regimes. We reconstructed a multicentury history of fire frequency, size, season, and severity from fire scars and establishment dates of 1426 trees sampled on grids in four watersheds (-64 plots, over -1620 ha each) representative of the Blue Mountains, Oregon and Washington, USA. The influence of regional climate, a top-down control, was inferred from among-watershed variation in fire regimes, while the influence of local topography, a bottom-up control, was inferred from within-watershed variation. Before about 1900, fire regimes varied among and within watersheds, suggesting that both top-down and bottom-up controls were important. At the regional scale, dry forests (dominated by ponderosa pine), burned twice as frequently and earlier in the growing season in southern watersheds than in northern watersheds, consistent with longer and drier fire seasons to the south. Mesic forests (dominated by subalpine fir or grand fir) probably also burned more frequently to the south. At the local scale, fire frequency varied with different parameters of topography in watersheds with steep terrain, but not in the watershed with gentle terrain. Frequency varied with aspect in watersheds where topographic facets are separated by significant barriers to fire spread, but not in watersheds where such facets interfinger without fire barriers. Frequency varied with elevation where elevation and aspect interact to create gradients in snow-cover duration and also where steep talus interrupts fuel continuity. Frequency did not vary with slope within any watershed. The presence of both regional-scale and local-scale variation in the Blue Mountains suggests that top-down and bottom-up controls were both important and acted simultaneously to influence fire regimes in the past. However, an abrupt decline in fire frequency around 1900 was much greater than any regional or local variation in the previous several centuries and indicates that 20th-century fire regimes in these watersheds were dramatically affected by additional controls such as livestock grazing and fire suppression. Our results demonstrate the usefulness of examining spatial variation in historical fire regimes across scales as a means for inferring their controls.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/ustuc001-plot-information.csv Supplemental Data; ustuc001-plot-information.csv GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/ustuc001.txt More Information; ustuc001.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/ustuc001-fire-hist-graph.pdf Fire History Graph; ustuc001-fire-hist-graph.pdf GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/establishment/northamerica/ustuc001.dat Establishment Data; ustuc001.dat GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/ustuc001-fire-hist-graph.png Fire History Graph; ustuc001-fire-hist-graph.png GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/ustuc001.fhx Fire Scar Data; ustuc001.fhx USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11