Umbanhowar fire data from Sharkey Lake, Minnesota - IMPD USSKL001 Umbanhowar Jr., C.E. Umbanhowar Jr., C.E. 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 (Sharkey Lake, south-central, MN, USA>LATITUDE 44.59261>LONGITUDE -93.41329) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Umbanhowar Jr., C.E. 2016-08-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20510 https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/usskl001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/usskl001.txt English https://www.ncdc.noaa.gov/paleo/study/20510 https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/charcoal/northamerica/usskl001.txt Camill, P., Umbanhowar, C.E., Jr., Teed, R., Geiss, C.E., Aldinger, J., Dvorak, L., Kenning, J., Limmer, J., and Walkup, K.2003Late-glacial and Holocene climatic effects on fire and vegetation dynamics at the prairie-forest ecotone in south-central Minnesota Journal of Ecology91822-836 Umbanhowar Jr., C.E., Camill, P., Geiss, C.E., and Teed, R.2006Asymmetric vegetation responses to mid-Holocene aridity at the prairie-forest ecotone in south-central MinnesotaQuaternary Research66.153-6610.1016/j.yqres.2006.03.005 Geiss, C.E., Banerjee, S.K., Camill, P., and Umbanhowar Jr., C.E.2004Sediment-magnetic signature of land-use and drought as recorded in lake sediment from south-central Minnesota, USAQuaternary Research62.2117-12510.1016/j.yqres.2004.06.009 Geiss, C.E., Umbanhowar, C.E.J., Camill, P., and Banerjee, S.K.2003Sediment magnetic properties reveal Holocene climate change along the Minnesota prairie-forest ecotoneJournal of Paleolimnology30151-16610.1023/A:1025574100319 START YEAR: 13037 cal yr BP * END YEAR: -34 cal yr BP -93.41329 44.59261 -93.41329 44.59261