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<br> LI07_charParams.csv<br> LI07_charResults.csv<br> PO07_charData.csv<br> PO07_charParams.csv<br> PO07_charResults.csv<br> RA07_charData.csv<br> RA07_charParams.csv<br> RA07_charResults.csv<br> UC07_charData.csv<br> UC07_charParams.csv<br> 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 <b>raw</b> data (by column): cmTop: top depth (cm) of the sample<br> cmBot: bottom depth (cm) of the sample<br> ageTop: estimated age at top of sample (cal. yr before CE 1950)<br> ageBot: estimated age at bottom of sample (cal. yr before CE 1950)<br> charVol: volume of sediment subsample from which charcoal was prepared (cm³)<br> charCount: pieces of charcoal counted in the sample (#) Checksum values:<br> LI07_charData.csv: 192 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 313963<br> Column 6 (charCount (#)):1586 PO07_charData.csv: 234 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 438415<br> Column 6 (charCount (#)): 823 RA07_charData.csv: 302 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 448677<br> Column 6 (charCount (#)): 556 UC07_charData.csv: 393 rows (with headers), 6 columns Column 3 (ageTop (yr BP)): 534182<br> 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 <b>derived</b> data (reflecting interpolation) cmTop_i: top depth (cm) of interpolated sample<br> ageTop_i: bottom depth (cm) of interpolated sample<br> charCount_i: pieces of charcoal in interpolated sample<br> charVol_i: volume of interpolated sample<br> charCon_i: charcoal concentration in interpolated sample (pieces/cm³)<br> charAcc_i: charcoal accumulation rate, based in interpolated concentration and age (pieces/cm²*yr)<br> charBkg: background charcoal, C_back, smoothed based on methods selected in *_charParams.csv file, (pieces/cm²*yr)<br> charPeak: peak charcoal, C_peak, based on methods selected in *_charParams.csv file, (pieces/cm²*yr)<br> thresh1: threshold value (pieces/cm²*yr) based on first threshold entered in *_charParams.csv file<br> thresh2: same as thresh1, but for second threshold entered<br> thresh3: same as thresh1, but for third threshold entered<br> threshFinalPos: positive threshold value (pieces/cm²*yr), based on fourth threshold value entered in *charParams.csv file.<br> threshFinalNeg: negative threshold value (pieces/cm²*yr), based on fourth threshold value entered in *charParams.csv file.<br> SNI: signal-to-noise index values, based on threshdFinalPos values.<br> threshGOF: <i>P</i> value from KS goodness-of-fit test between fitted noise distribution and empirical data below the sample-specific threshold. <br> peaks1: samples that exceed thresh1 values are identified by “1”; only the first sample is identified.<br> peaks2: same as peaks1, but for the second threshold value<br> peaks3: same as peaks1, but for the third threshold value<br> peaksFinal: same as peaks1, but for the final threshold value<br> peaksInsig.: peaks that exceeded threshFinalPos (the final threshold), but did not pass the minimum-count test are identified with a “1”<br> 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<br> Column 6 (char Acc_i): 9.139<br> Column 19 (peaks Final): 14 PO07_charResults.csv: 206 rows (with headers), 21 columns Column 2 (age Top_i): 301965<br> Column 6 (char Acc_i): 4.5649<br> Column 19 (peaks Final): 12 RA07_charResults.csv: 206 rows (with headers), 21 columns Column 2 (age Top_i): 301965<br> Column 6 (char Acc_i): 3.1762<br> Column 19 (peaks Final): 17 UC07_charResults.csv: 206 rows (with headers), 21 columns Column 2 (age Top_i): 301965<br> Column 6 (char Acc_i): 3.655<br> Column 19 (peaks Final): 24

文件列表：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

数据集说明：本数据集针对每个研究站点，提供三类文件，用于存储炭屑分析程序CharAnalysis（详见正文“方法”部分）运行所需的原始输入数据、所用参数文件以及分析输出结果。文件名前缀为站点代码：LI代表Little Isac（利特尔艾萨克）、PO代表Poktovik（波克托维克）、RA代表Raven（雷文）、UC代表Uchugrak（乌丘格拉克）。

由于火灾复发间隔与平滑火频的计算是在CharAnalysis程序外部完成的，并未反映*_charParams.csv文件中指定的时间区间，因此*_charResults.csv文件中包含了上述两类计算的相关数据。

缺失值标记规则：在*_charParams.csv文件中使用-9999表示缺失值，在*_charResults.csv文件中使用NaN表示缺失值。

### 07_charData.csv（原始输入数据）
该文件包含以下按列排列的原始数据：
1. cmTop：样品顶部深度（单位：厘米）
2. cmBot：样品底部深度（单位：厘米）
3. ageTop：样品顶部的估算年龄（公元1950年之前的校准年，cal. yr before CE 1950）
4. ageBot：样品底部的估算年龄（公元1950年之前的校准年）
5. charVol：制备炭屑所用沉积物副样的体积（单位：立方厘米，cm³）
6. charCount：样品中计数的炭屑块数（单位：块）

各站点charData.csv文件校验和：
- LI07_charData.csv：含表头共192行，6列；第3列（ageTop，距公元1950年的年代，yr BP）校验和为313963；第6列（charCount，炭屑计数）校验和为1586
- PO07_charData.csv：含表头共234行，6列；第3列校验和为438415；第6列校验和为823
- RA07_charData.csv：含表头共302行，6列；第3列校验和为448677；第6列校验和为556
- UC07_charData.csv：含表头共393行，6列；第3列校验和为534182；第6列校验和为543

### 07_charParams.csv（参数文件）
参数文件的详细说明请参阅CharAnalysis用户指南，该指南可通过前文关联的网站获取。
各站点charParams.csv文件校验和：
- LI07_charParams.csv：含表头共26行，5列；第3列（Parameters，参数项）校验和为-49519.821
- PO07_charParams.csv：含表头共26行，5列；第3列校验和为-52975.821
- RA07_charParams.csv：含表头共26行，5列；第3列校验和为-5199.821
- UC07_charParams.csv：含表头共26行，5列；第3列校验和为-51479.821

### 07_charResults.csv（衍生数据，基于插值生成）
该文件包含以下按列排列的衍生数据：
1. cmTop_i：插值样品的顶部深度（单位：厘米）
2. ageTop_i：插值样品的底部深度（单位：厘米）*注：原文此处疑似笔误，对应字段实际应为插值样品顶部年龄
3. charCount_i：插值样品中的炭屑块数
4. charVol_i：插值样品的体积（单位：立方厘米）
5. charCon_i：插值样品中的炭屑浓度（单位：块/立方厘米）
6. charAcc_i：基于插值浓度与年代计算的炭屑积累速率（单位：块/(平方厘米·年)）
7. charBkg：背景炭屑（C_back）：基于*_charParams.csv文件中选定的方法进行平滑处理的背景炭屑量（单位：块/(平方厘米·年)）
8. charPeak：峰值炭屑（C_peak）：基于*_charParams.csv文件中选定的方法计算的峰值炭屑量（单位：块/(平方厘米·年)）
9. thresh1：阈值1：基于*_charParams.csv文件中输入的第一个阈值得到的阈值数值（单位：块/(平方厘米·年)）
10. thresh2：阈值2：与阈值1定义一致，对应输入的第二个阈值
11. thresh3：阈值3：与阈值1定义一致，对应输入的第三个阈值
12. threshFinalPos：最终正阈值：基于*_charParams.csv文件中输入的第四个阈值得到的正阈值数值（单位：块/(平方厘米·年)）
13. threshFinalNeg：最终负阈值：基于*_charParams.csv文件中输入的第四个阈值得到的负阈值数值（单位：块/(平方厘米·年)）
14. SNI（信噪比指数）：基于最终正阈值计算得到的信噪比指数值
15. threshGOF：阈值拟合优度：针对样本专属阈值以下的拟合噪声分布与实测数据进行柯尔莫哥洛夫-斯米尔诺夫（KS）拟合优度检验得到的P值
16. peaks1：峰值1：超过阈值1的样品标记为“1”，仅标记首个符合条件的样品
17. peaks2：峰值2：与峰值1定义一致，对应第二个阈值
18. peaks3：峰值3：与峰值1定义一致，对应第三个阈值
19. peaksFinal：最终峰值：与峰值1定义一致，对应最终阈值
20. peaksInsig.：非显著峰值：超过最终正阈值（即最终阈值）但未通过最小计数检验的峰值，标记为“1”
21. peakMag：峰值幅度：给定峰值内累计的总炭屑块数（单位：块/(平方厘米·峰)）；若峰值仅对应单个样品，则峰值幅度为炭屑量减去正阈值；若峰值对应多个样品，则将所有超过最终阈值的样品的炭屑量求和

各站点charResults.csv文件校验和：
- LI07_charResults.csv：含表头共206行，21列；第2列（ageTop_i）校验和为301965；第6列（charAcc_i，炭屑积累速率）校验和为9.139；第19列（peaksFinal，最终峰值）校验和为14
- PO07_charResults.csv：含表头共206行，21列；第2列校验和为301965；第6列校验和为4.5649；第19列校验和为12
- RA07_charResults.csv：含表头共206行，21列；第2列校验和为301965；第6列校验和为3.1762；第19列校验和为17
- UC07_charResults.csv：含表头共206行，21列；第2列校验和为301965；第6列校验和为3.655；第19列校验和为24