Supplement 3. Raw and analyzed charcoal data for the past 3000 years for Raven, Uchugrak, Poktovik, and Little Isac lakes.

File List LI07_charData.csv LI07_charParams.csv LI07_charResults.csv PO07_charData.csv PO07_charParams.csv PO07_charResults.csv RA07_charData.csv RA07_charParams.csv RA07_charResults.csv UC07_charData.csv UC07_charParams.csv UC07_charResults.csv Description For each site, three files provide the raw input data, the parameters used, and the output data for charcoal analysis via the program CharAnalysis (see ‘Methods’ in main text). File names reference site codes: LI (Little Isac), PO (Poktovik), RA (Raven), and UC (Uchugrak). The “*_charResults.csv” files has data on fire return intervals and smoothed fire frequency removed, given that these calculations were done outside of the program and do not reflect the time intervals given in the *_charParams.csv files. Missing values denoted by -9999 (*_charParams.csv) or NaN (*_charResults.csv). **07_charData.csv includes the following raw data (by column): cmTop: top depth (cm) of the sample cmBot: bottom depth (cm) of the sample ageTop: estimated age at top of sample (cal. yr before CE 1950) ageBot: estimated age at bottom of sample (cal. yr before CE 1950) charVol: volume of sediment subsample from which charcoal was prepared (cm3) charCount: pieces of charcoal counted in the sample (#) Checksum values: LI07_charData.csv: 192 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 313963 Column 6 (charCount (#)):1586 PO07_charData.csv: 234 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 438415 Column 6 (charCount (#)): 823 RA07_charData.csv: 302 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 448677 Column 6 (charCount (#)): 556 UC07_charData.csv: 393 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 534182 Column 6 (charCount (#)): 543 **07_charParams.csv: See CharAnalysis User’s Guide for description of parameters file, available at the web site linked to above. Checksum values: LI07_charParams.csv: 26 rows (with headers), 5 columns Column 3 (Parameters): -49519.821 PO07_ charParams.csv: 26 rows (with headers), 5 columns Column 3 (Parameters): -52975.821 RA07_ charParams.csv: 26 rows (with headers), 5 columns Column 3 (Parameters): -5199.821 UC07_ charParams.csv: 26 rows (with headers), 5 columns Column 3 (Parameters): -51479.821 **07_charResults.csv includes the following derived data (reflecting interpolation) cmTop_i: top depth (cm) of interpolated sample ageTop_i: bottom depth (cm) of interpolated sample charCount_i: pieces of charcoal in interpolated sample charVol_i: volume of interpolated sample charCon_i: charcoal concentration in interpolated sample (pieces/cm3) charAcc_i: charcoal accumulation rate, based in interpolated concentration and age (pieces/cm2*yr) charBkg: background charcoal, Cback, smoothed based on methods selected in *_charParams.csv file, (pieces/cm2*yr) charPeak: peak charcoal, Cpeak, based on methods selected in *_charParams.csv file, (pieces/cm2*yr) thresh1: threshold value (pieces/cm2*yr) based on first threshold entered in *_charParams.csv file thresh2: same as thresh1, but for second threshold entered thresh3: same as thresh1, but for third threshold entered threshFinalPos: positive threshold value (pieces/cm2*yr), based on fourth threshold value entered in *charParams.csv file. threshFinalNeg: negative threshold value (pieces/cm2*yr), based on fourth threshold value entered in *charParams.csv file. SNI: signal-to-noise index values, based on threshdFinalPos values. threshGOF: P value from KS goodness-of-fit test between fitted noise distribution and empirical data below the sample-specific threshold. peaks1: samples that exceed thresh1 values are identified by “1”; only the first sample is identified. peaks2: same as peaks1, but for the second threshold value peaks3: same as peaks1, but for the third threshold value peaksFinal: same as peaks1, but for the final threshold value peaksInsig.: peaks that exceeded threshFinalPos (the final threshold), but did not pass the minimum-count test are identified with a “1” peakMag: peak magnitude is the total pieces of charcoal accumulated in a given peak (pieces/cm2*peak); if a peak is only one sample long, then peak magnitude is simply CHAR minus the positive threshold. If a peak is more than one sample long, then each sample exceeding threshFinal is summed. Checksum values: LI07_charResults.csv: 206 rows (with headers), 21 columns Column 2 (age Top_i): 301965 Column 6 (char Acc_i): 9.139 Column 19 (peaks Final): 14 PO07_charResults.csv: 206 rows (with headers), 21 columns Column 2 (age Top_i): 301965 Column 6 (char Acc_i): 4.5649 Column 19 (peaks Final): 12 RA07_charResults.csv: 206 rows (with headers), 21 columns Column 2 (age Top_i): 301965 Column 6 (char Acc_i): 3.1762 Column 19 (peaks Final): 17 UC07_charResults.csv: 206 rows (with headers), 21 columns Column 2 (age Top_i): 301965 Column 6 (char Acc_i): 3.655 Column 19 (peaks Final): 24