noaa-fire-20437 Umbanhowar fire data from Coldwater Lake, North Dakota - IMPD USCWL001 Umbanhowar Jr., C.E. Umbanhowar fire data from Coldwater Lake, North Dakota - IMPD USCWL001 2016-08-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20437 Investigator C.E. Umbanhowar Jr. 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 age,null,null,calendar year before present,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 volume,wet sediment,null,milliliter,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 charcoal sediment geoscientificInformation 11022 cal yr BP -30 cal yr BP Complete 46.01666 46.01666 -99.06666 -99.06666 596 596 Continent North America United States Of America North Dakota Coldwater Lake, northern Great Plains, ND, USA>LATITUDE 46.01666>LONGITUDE -99.06666 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Umbanhowar, C.E. 2004 Palaeogeography, Palaeoclimatology, Palaeoecology 208 141-152

The relationship of fire and climate in explaining the origin and maintenance of the grasslands of the northern Great Plains has long been of interest. I examined the hypothesis that burning was more frequent during wet years using charcoal to reconstruct fire histories near Coldwater Lake in southcentral ND, and Rice Lake in northcentral ND and published records of ostracod Mg/Ca ratios as a proxy for climate at these same two sites. Over the past 10 000 years, charcoal influx rates for Coldwater (0.04-5.68 mm2/cm2/year) greatly exceeded influx rates for Rice (<0.01-1.91 mm2/cm2/year). Both sites showed strong, significant periodicities of ~1500-1800, ~800-900 and ~130-140 years but charcoal maxima and minima were only similar at ~4200 cal years BP. Charcoal influx during the past 2000 years also revealed strong periodicities of between 310-400 and 140 years at both sites. Comparison of smoothed charcoal influxes and ostracod Mg/Ca ratios suggests that both proxies are responding to changes in climate. When smoothed with a 320-400-year window, increases in charcoal influx typically preceded rises in ostracod Mg/Ca ratio by ~50-100 years, and further smoothing (140-year window) of the residuals suggested a variable relationship between Mg/Ca ratios and charcoal influx. These results do not clearly support or reject the fuel limitation hypothesis, and this lack of clear support may result from (a) climate-driven shifts in the mix of C3 and C4 grasses resulting in maximum productivity at intermediate moisture levels, (b) possibly different responses of charcoal and Mg/Ca ratios to summer vs. winter precipitation, or (c) ground-water driven lags in the response of Mg/Ca ratios to shifts in climate. Comparison of the results from this study with other studies suggests that links between fire and fuels at finer time scales (0-100 years) may be broadly constrained by longer term (~500-2000 years) patterns of climate in the northern Great Plains.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/uscwl001.txt Charcoal Data; uscwl001.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11