noaa-fire-20510 Umbanhowar fire data from Sharkey Lake, Minnesota - IMPD USSKL001 Umbanhowar Jr., C.E. Umbanhowar fire data from Sharkey Lake, Minnesota - IMPD USSKL001 2016-08-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20510 Investigator C.E. Umbanhowar Jr. 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,null,null,centimeter,null,fire history|paleolimnology,null,null,N,null earth science paleoclimate fire history|paleolimnology charcoal,sediment,null,square centimeter per milliliter,null,fire history|paleolimnology,null,null,N,> 180 um 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 13037 cal yr BP -34 cal yr BP Complete 44.59261 44.59261 -93.41329 -93.41329 308 308 Continent North America United States Of America Minnesota Sharkey Lake, south-central, MN, USA>LATITUDE 44.59261>LONGITUDE -93.41329 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 Camill, P., Umbanhowar, C.E., Jr., Teed, R., Geiss, C.E., Aldinger, J., Dvorak, L., Kenning, J., Limmer, J., and Walkup, K. 2003 Journal of Ecology 91 822-836 Umbanhowar Jr., C.E., Camill, P., Geiss, C.E., and Teed, R. 2006 Quaternary Research 66.1 53-66 10.1016/j.yqres.2006.03.005 Geiss, C.E., Banerjee, S.K., Camill, P., and Umbanhowar Jr., C.E. 2004 Quaternary Research 62.2 117-125 10.1016/j.yqres.2004.06.009 Geiss, C.E., Umbanhowar, C.E.J., Camill, P., and Banerjee, S.K. 2003 Journal of Paleolimnology 30 151-166 10.1023/A:1025574100319

1 Treeline ecotones, such as the prairie-forest boundary, represent climatically sensitive regions where the relative abundance of vegetation types is controlled by complex interactions between climate and local factors. Responses of vegetation and fire to climate change may be tightly linked as a result of strong feedbacks among fuel production, vegetation structure and fire frequency/severity, but the importance of these feedbacks for controlling the stability of this ecotone is unclear.; 2 In this study, we examined the prairie–forest ecotone in south-central Minnesota using two lake sediment cores to reconstruct independent records of climate, vegetation and fire over the past 12 500 years. Using pollen, charcoal, sediment magnetic analyses and LOI properties, we investigated whether fires were controlled directly by climate or indirectly by fuel production.; 3 Sediment magnetic and LOI data suggest four broad climatic periods occurring c. 11 350-8250 BP (cool/humid), c. 8250-4250 BP (warm/dry)c. 4250-2450 BP (warm/humid), and c. 2450-0 BP (cool/humid), indicating that, since the mid-Holocene, climate has shifted towards wetter conditions favouring greater in-lake production and fuel production on the landscape.; 4 The area surrounding both lakes was characterized by boreal forest c. 12 500-10 000 BP, changing to an Ulmus-Ostrya forest c. 10 000-9000 BP, changing to a community dominated by prairie (Poaceae-Ambrosia-Artemisia) and deciduous forest taxa c. 8000-4250 BP, and finally shifting to a Quercus-dominated woodland/savanna beginning c. 4250-3000 BP. ; 5 Charcoal influx increased from an average of 0.11-0.62 mm2/cm2/yr during the early Holocene forest period (c . 11 350-8250 BP) to 1.71-3.36 mm2/cm2/yr during the per iod of prairie expansion (c. 8250–4250 BP) and again increased to 4.18–4.90 mm2/cm2/yr at the start of the woodland/savanna period (c. 4250 BP).; 6 As a result of the influence of climate on community composition and fuel productivity, changes in fire severity may be the result and not the cause of shifts in vegetation.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/usskl001.txt Charcoal Data; usskl001.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11