noaa-fire-19541 Chipman fire data from Tungak Lake, Yukon-Kuskowim Delta, Alaska - IMPD USTG-001 Chipman, M.L.; Hudspith, V.; Higuera, P.E.; Duffy, P.A.; Kelly, R.F.; Oswald, W.; Hu, F.S. Chipman fire data from Tungak Lake, Yukon-Kuskowim Delta, Alaska - IMPD USTG-001 2015-12-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19541 Investigator M.L. Chipman Investigator V. Hudspith Investigator P.E. Higuera Investigator P.A. Duffy Investigator R.F. Kelly Investigator W. Oswald Investigator F.S. Hu earth science paleoclimate fire history|paleolimnology volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,fire history|paleolimnology,null,magnetic susceptibility measurement with single sample sensor,N,1e-6 unitless SI earth science paleoclimate fire history|paleolimnology depth at sample start,null,null,centimeter,null,fire history|paleolimnology,null,null,N,null earth science paleoclimate fire history|paleolimnology depth at sample end,null,null,centimeter,null,fire history|paleolimnology,null,null,N,null earth science paleoclimate fire history|paleolimnology age at sample end,null,null,calendar year before present,null,fire history|paleolimnology,null,null,N,null earth science paleoclimate fire history|paleolimnology charcoal,sediment,null,count,null,fire history|paleolimnology,null,null,N,> 125 um earth science paleoclimate fire history|paleolimnology age at sample start,null,null,calendar year before present,null,fire history|paleolimnology,null,null,N,null earth science paleoclimate fire history|paleolimnology volume,wet sediment,null,milliliter,null,fire history|paleolimnology,null,null,N,null earth science paleoclimate fire history charcoal sediment geoscientificInformation Arctic 35430 cal yr BP -62 cal yr BP Complete 61.4272 61.4272 -164.200617 -164.200617 25 25 Continent North America United States Of America Alaska Tungak Lake>LATITUDE 61.4272>LONGITUDE -164.200617 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 Chipman, M.L., Hudspith, V., Higuera, P.E., Duffy, P.A., Kelly, R., Oswald, W.W., and F.S. Hu 2015 Biogeosciences 12 4017-4027 10.5194/bg-12-4017-2015

Anthropogenic climate change has altered many ecosystem processes in the Arctic tundra and may have resulted in unprecedented fire activity. Evaluating the significance of recent fires requires knowledge from the paleofire record because observational data in the Arctic span only several decades, much shorter than the natural fire rotation in Arctic tundra regions. Here we report results of charcoal analysis on lake sediments from four Alaskan lakes to infer the broad spatial and temporal patterns of tundra-fire occurrence over the past 35 000 years. Background charcoal accumulation rates are low in all records (0-0.05 pieces cm-2 yr-1), suggesting minimal biomass burning across our study areas. Charcoal peak analysis reveals that the mean fire-return interval (FRI; years between consecutive fire events) ranged from ca. 1650 to 6050 years at our sites, and that the most recent fire events occurred from ca. 880 to 7030 years ago, except for the CE 2007 Anaktuvuk River Fire. These mean FRI estimates are longer than the fire rotation periods estimated for the past 63 years in the areas surrounding three of the four study lakes. This result suggests that the frequency of tundra burning was higher over the recent past compared to the late Quaternary in some tundra regions. However, the ranges of FRI estimates from our paleofire records overlap with the expected values based on fire-rotation-period estimates from the observational fire data, and the differences are statistically insignificant. Together with previous tundra-fire reconstructions, these data suggest that the rate of tundra burning was spatially variable and that fires were extremely rare in our study areas throughout the late Quaternary. Given the rarity of tundra burning over multiple millennia in our study areas and the pronounced effects of fire on tundra ecosystem processes such as carbon cycling, dramatic tundra ecosystem changes are expected if anthropogenic climate change leads to more frequent tundra fires. STUDY NOTES: Chronology and macroscopic charcoal counts (number of pieces >125 microns) from Tungak Lake, Yukon-Kuskowim Delta, Alaska. Provided Keywords: tundra fire-regimes, Arctic, Alaska Additional Information: Contact person: Feng Sheng Hu Sample storage location: University of Illinois, Urbana. Sampling date: 2012 Site size(ha): 117 Location description: Low-Shrub tundra State/Province: Alaska Water depth(cm): 14.8 Sampling device: All cores were taken with a combination of 7.5 cm livingstone, 5 cm livingstone, and 7.5 cm polycarbonate tube; Analysis method: Macroscopic charcoal counts (>125 microns). Please see Chipman et al. 2015 for details

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/ustg-001.txt Charcoal Data; ustg-001.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/supplemental/ustg-001-charanalysis-data.csv Supplemental Material: Charcoal data in CharAnalysis input file format; ustg-001-charanalysis-data.csv GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/supplemental/ustg-001-charanalysis-results.csv Supplemental Material: CharAnalysis results file; ustg-001-charanalysis-results.csv GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/supplemental/ustg-001-charanalysis-params.csv Supplemental Material: CharAnalysis parameters file; ustg-001-charanalysis-params.csv GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/ustg-001.mag Magnetic Susceptibility Data; ustg-001.mag USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11