| Summary: | Unpublished sediment charcoal and chronological data associated with ARC-1023669 (P. E. Higuera, Collaborating PI), in preparation for publication at the time of data submission, from Erethizon, Fox, Red, and Tempest lakes. November 2015 ************************************************************************* The archive includes raw charcoal and chronology data from four lakes in tundra ecosystems in Alaska, associated with NSF grant ARC-1023669 (PI = Higuera), in comma separated values (CSV) format. Each lake has an associated ReadMe file, with metatdata on lake location, surface area, water depth at the coring location, and ecoregion (as defined by Nowaki et al. 2001). Lake sediment samples were collected with a polycarbonate tube (top c. 1 m) or Livingstone piston corer (2” or 3” diameter), in individual drives. In the lab, individual drives were sliced at 0.25 or 0.50 cm, and charcoal was prepared and counted following methods described in Higuera et al. (2011). Charcoal data include the raw counts from each sample, along with sample volume, to derive charcoal concentrations. Chronology data (“XXX_14C_210Pb.csv”) include measured values of 210Pb from samples in the top 10-20 cm from each lake, and the radiocarbon ages of deeper samples, measured from macrofossils or concentrated charcoal. Details are provided in the site-specific ReadMe file. ************************************************************************* Literature cited in this ReadMe file: Higuera, P. E., M. L. Chipman, J. L. Barnes, M. A. Urban, and F. S. Hu. 2011. Variability of tundra fire regimes in Arctic Alaska: millennial scale patterns and ecological implications. Ecological Applications 21:3211-3226. Nowacki, G., P. Spencer, T. Brock, M. Fleming, and T. Jorgenson. 2001. Ecoregions of Alaska and Neighboring Territories. Online at http://agdc.usgs.gov/data/projects/fhm/, USGS, Reston, VA. *************************************************************************
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