# Yukon-Kuskokwim Delta, Alaska, Last millennium lake sediment macrocharcoal, biomarker, and geochemical data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/36776 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-36776.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Paleolimnology # # Dataset_DOI: 10.25921/swff-7y78 # # Science_Keywords: Air temperature reconstruction, Arctic, Other reconstruction #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/paleolimnology/alaska/sae-lim2022/sae-lim2019-ykdelta-environmental.txt # Data_Download_Description: NOAA Template File; Geochemical Data # #--------------------------------------- # Contribution_Date # Date: 2022-09-10 #--------------------------------------- # File_Last_Modified_Date # Date: 2022-09-10 #--------------------------------------- # Title # Study_Name: Yukon-Kuskokwim Delta, Alaska, Last millennium lake sediment macrocharcoal, biomarker, and geochemical data #--------------------------------------- # Investigators # Investigators: Sae-Lim, Jarunetr; Russell, James; Vachula, Richard; Holmes, Robert; Mann, Paul; Schade, John; Natali, Susan #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Arctic, Alaska, Paleofire, late Holocene, GDGTs, charcoal #--------------------------------------- # Publication # Authors: Sae-Lim, J., Russell, J.M., Vachula, R.S., Holmes, R.M., Mann, P.J., Schade, J.D., and Natali, S.M. # Published_Date_or_Year: 2019 # Published_Title: Temperature-controlled tundra fire severity and frequency during the last millennium in the Yukon-Kuskokwim Delta, Alaska # Journal_Name: The Holocene # Volume: 29 # Edition: # Issue: 7 # Pages: 1223-1233 # Report_Number: # DOI: 10.1177/0959683619838036 # Online_Resource: https://journals.sagepub.com/doi/10.1177/0959683619838036 # Full_Citation: # Abstract: Wildfire is an important disturbance to Arctic tundra ecosystems. In the coming decades, tundra fire frequency, intensity, and extent are projected to increase because of anthropogenic climate change. To more accurately predict the effects of climate change on tundra fire regimes, it is critical to have detailed knowledge of the natural frequency and extent of past wildfires and how they responded to past climate variability. We present analyses of fire frequency and temperature from a lake sediment core from the Yukon-Kuskokwim (YK) Delta. Our ca. 1000 macroscopic charcoal record shows more frequent but possibly less severe tundra fires during the first half of the last millennium, whereas less frequent, possibly more severe fires characterize the latter half. Our temperature reconstruction, based on distributional changes of branched glycerol dialkyl glycerol tetraethers (brGDGTs), shows slightly warmer conditions from ca. AD 1000 to 1500, and cooler conditions thereafter (ca. AD 1500 to 2000), suggesting that fire frequency increases when climate is relatively warmer in this region. When wildfires occur more frequently, fire severity may decrease because of limited biomass (fuel source) accumulating between fires. The data suggest that tundra ecosystems are highly sensitive to climate change, and that a warmer climate, which is predicted to develop in the near future, will result in more frequent tundra wildfires. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: NSF-1624927 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Institute at Brown for Environment and Society # Grant: Voss Undergraduate Research Fellowship in Environmental Science and Communication #--------------------------------------- # Site_Information # Site_Name: Lake Lin (unofficial name) # Location: Alaska # Northernmost_Latitude: 61.28721 # Southernmost_Latitude: 61.28721 # Easternmost_Longitude: -163.26052 # Westernmost_Longitude: -163.26052 # Elevation_m: 2.43 #--------------------------------------- # Data_Collection # Collection_Name: sae-lim2019-ykdelta-environmental # First_Year: 948 # Last_Year: -65 # Time_Unit: calendar year before present # Core_Length_m: 0.515 # Parameter_Keywords: carbon isotopes, biomarkers, geochemistry, air temperature # Notes: #--------------------------------------- # Chronology_Information # Chronology: # Radiocarbon ages from Lake Lin. Present is AD 1950. # Sample# NOSAMS sample code # Depth.Top Corrected depth top of sample interval (cm) # Depth.Bot Corrected depth bottom of sample interval (cm) # Material Material measured # 14C.age 14C AMS age (year BP) # 14C.age.1SD 14C AMS age 1-sigma (year BP) # 14C.calib Calibrated age (cal year AD) # 14C.calib.1SD Calibrated age 1-sigma (cal year AD) # rejected Rejected sample # # Sample# Depth.Top Depth.Bot Material 14C.age 14C.age.1SD 14C.calib 14C.calib.1SD rejected # 148150 12.4448 12.752 Twigs 335 15 1579 22 NaN # 148149 24.53 25.15 Leaves 2490 20 -618 78 Yes # 148148 38.5925 38.921 Twigs >modern N/A >1950 NaN Yes # 148147 47.7855 48.45 Small parts of plants 915 20 1101 63 NaN # #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## Depth_cm Depth,,,centimeter,,paleolimnology; fire history,,,N,corrected depth (see Sae-Lim et al. 2019) ## Age age,,,calendar year before present,,paleolimnology; fire history,,,N,Calibrated age; modeled age of sediment ## Char.vol volume,,,cubic centimeter,,paleolimnology,,,N,Interval volume ## Char.count charcoal,,,count ,,paleolimnology; fire history,,,N,Macroscopic charcoal ## TC carbon,,,Percent,,paleolimnology,,,N, ## TN nitrogen,,,Percent,,paleolimnology,,,N, ## Si_cps Titanium,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## K_cps Potassium,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Ca_cps Calcium,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Ti_cps Titanium,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Mn_cps Manganese,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Fe_cps Iron,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Zn_cps Zinc,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Rb_cps Rubidium,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Sr_cps Strontium,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, ## Zr_cps Zirconium,,,count per second,,paleolimnology,,x-ray fluorescence spectroscopy,N, #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: -999 Depth_cm Age Char.vol Char.count TC TN Si_cps K_cps Ca_cps Ti_cps Mn_cps Fe_cps Zn_cps Rb_cps Sr_cps Zr_cps 0.86 -65 1.0713 16 7.503 0.439 17555.85 81532.63 7228.25 2665.34 384.98 21432.84 72.27 33.75 120.95 112.14 1.42 -48 1.3722 8 7.893 0.458 18882.95 70546.69 6171.28 2593.31 358.89 20162.31 77.72 29.3 105.47 101.23 2.07 -37 1.243 8 8.108 0.467 15315.48 65077.3 5377.2 2094.98 292.26 18045.55 59.57 23.21 82.1 76.79 2.73 -24 1.3031 7 8.228 0.471 18307.79 75835.09 6650.99 2648.15 377.94 21450.84 75.19 32.51 115.37 108.68 3.59 -10 1.209 7 8.052 0.454 15665.77 66348.7 5457.7 2078.67 296.29 17638.33 58.51 23.05 78.91 71.02 4.22 7 1.4065 6 8.018 0.447 15149.77 66398.48 5537.05 2024.26 270.39 17518.21 53.27 22.92 82.52 73.98 4.91 19 1.4072 10 7.571 0.416 15444.71 66096.8 5346.52 2119.63 305.05 17979.86 59.96 23.21 80.46 71.63 5.53 33 1.5361 4 7.081 0.388 20509.17 80223.03 7403.82 2927.65 407.1 22096.98 76.38 36.71 138.64 136.92 6.13 46 1.423 4 12.028 0.529 20104.57 73480.76 6512.7 2648 364.65 20775.01 76.88 31.08 115.97 104.82 6.81 58 1.4043 6 8.061 0.441 10895.74 49854.04 3748.27 1376.01 191.14 13115.88 37.51 12.37 42.14 38.13 7.48 72 1.3891 3 8.14 0.449 14005.92 63785.4 5393.17 2263.52 329.47 18926.68 56.92 21.77 79.95 75.77 8.19 86 1.3629 5 8.644 0.494 14728.62 67709.19 5588.98 2230.92 322.14 19323.54 57.05 23.66 86.13 74.11 8.97 100 1.294 18 7.889 0.443 16157.41 68156.25 6176.21 2485.12 341.29 19928.74 60.6 24.5 100.36 87.98 9.61 115 1.3578 9 9.814 0.529 16101.53 59690.95 5562.97 1992.21 285.87 16469.04 43.73 18.35 78.42 70.33 10.28 128 1.3989 13 9.365 0.516 16673.18 75435.43 7015.18 2827.41 396.19 21840.77 65.62 29.68 124.1 126.71 10.94 142 1.3091 12 8.55 0.474 22619 73763.59 6911.28 2753.62 410.95 22910.2 130.19 31.94 121.08 122.66 11.45 155 1.4003 11 8.911 0.495 17014.55 76812.89 6941.47 2694.84 394.75 21838.24 73.93 32.5 122.66 120.28 12.14 165 1.3333 10 8.315 0.476 9045.68 79028.36 6360.97 2515.35 378.82 21327.45 68.02 29.97 119.01 118.68 12.75 179 1.4251 3 8.313 0.461 8044.67 70667.43 5284.14 2176.73 325.81 18712.43 56.42 25.5 92.69 86.14 13.49 192 1.4098 7 8.484 0.467 8162.24 68840.82 5231.64 2100 334.14 18878.7 56.02 23.79 92.81 93.17 14.27 207 1.4276 5 7.549 0.44 7864.26 71149.71 5301.2 2209.48 338.1 19868.49 58.68 23.12 90.76 84.73 14.93 222 1.36 4 7.312 0.419 8037.76 68789.84 5361.77 2083.06 324.83 17581.47 54.71 22.35 91.51 90.05 15.62 236 1.3691 5 7.797 0.437 10560.79 86104.83 7211.54 3024.13 417.17 23523.94 81.43 37.46 148.64 143.82 16.26 249 1.3395 8 8.425 0.482 8492.14 67890.01 5177.13 2082.53 296.05 18209.26 56.87 22.48 82.36 75.07 16.87 262 1.2254 7 9.373 0.518 9488.48 78929.52 5926.65 2461.96 337.12 21203.31 68.47 30.85 114.27 110.21 17.55 274 1.168 17 9.608 0.524 8808.68 76635.32 5871.37 2407.28 342.35 20691.21 66.04 27.46 104.36 96.42 18.24 288 1.1753 13 11.739 0.572 7799.22 67292.28 5044.68 1992.59 299.34 17581.71 51.24 20.53 79.14 74.24 18.82 302 1.1944 14 11.136 0.547 7891.49 73859.16 5555.24 2416.78 358.18 20717.88 70.96 25.81 99.36 97.61 19.46 314 1.2365 8 8 0.431 8164.49 63962.83 5016.27 1981.11 294.26 16568.68 48.74 18.75 76.92 84.47 20.26 327 1.2415 13 8.279 0.446 8557.3 67904.46 5170.71 1975.14 280.5 17509.44 56.34 22.17 83.31 81.44 20.86 343 1.3711 3 6.748 0.389 7306.53 64352.89 4756.38 1687.66 253.35 15290.43 46.04 17.37 65.14 62.17 21.47 355 1.407 8 8.174 0.461 9022.14 73965.63 5671.39 2221.83 311.14 18409.25 57.87 26.54 98.54 99.68 22.15 367 1.3932 6 8.341 0.479 6704.9 60784.52 4372.67 1600.12 238.71 15200.43 41.6 15.92 59.53 51.55 22.79 381 1.3285 15 8.969 0.516 8594.22 55172.73 4438.4 1418.67 218.23 16940.24 30.58 10.83 39.75 37.1 23.48 394 1.258 6 10.946 0.618 11994.85 74091.38 6463.3 2415.34 384.04 22533.21 59.23 28.4 109.66 106.91 24.21 408 1.2027 14 11.617 0.63 12406.18 75173.74 6209.67 2369.13 356.3 19970.99 59.23 28.32 106.35 102.68 24.86 422 1.1903 4 12.489 0.667 7469.81 66522.99 4844.2 1845.73 295.74 16744.3 39.97 19.36 71.51 65.58 25.45 436 1.2271 7 12.921 0.7 7853.85 71632.09 5136.75 1951.35 276.24 17355.71 40.11 22.83 84.52 75.81 26.13 448 1.2454 10 11.411 0.604 8948.19 74140.69 5697.78 2222.73 338.21 19395.53 49.62 26.7 97.83 94.28 26.84 462 1.3347 12 10.647 0.576 12597.11 64333.86 5182.77 2225.08 317.78 20588.14 44.71 20.67 73.25 65.62 27.46 476 1.3304 8 9.274 0.496 10450.25 66106.52 5277.95 2036.8 311.21 18620.8 45.85 21.49 77.73 74.95 28.11 488 1.5228 6 7.64 0.426 8043.48 72919.67 5419.7 2173.14 312.91 18840.97 55.43 25.9 94.51 98.12 28.85 501 1.4503 11 7.913 0.461 6087.49 57689.79 3999.88 1446.92 216.96 14845.61 29.58 13.05 45.93 43.75 29.36 516 0.8427 5 9.255 0.521 6943.28 57954.25 4133.92 1460.03 241.88 14346.25 34.51 14.59 51.84 46.77 29.88 526 1.2497 4 13.679 0.688 8182.96 70398.78 5048.11 2008.54 324.25 19158.02 50.18 22.77 83.34 79.13 30.54 537 1.257 34 10.444 0.55 7649.31 65455.89 4740.8 1897.97 273.97 16916.7 51.41 18.87 67.99 62.58 31.24 550 1.4451 12 7.679 0.44 6966 63382.29 4461.37 1705.57 233.54 15558.28 36.63 17.98 63.06 56.56 31.87 565 1.4607 17 7.94 0.467 8827.14 78441.17 6181.89 2287.18 327.93 18660.78 52.8 27.15 108.22 104.04 32.51 577 1.4918 10 7.094 0.413 10794.25 68437.3 5461.07 2071.29 305.34 18445.01 47.92 23.3 87.33 82.16 33.20 590 1.5132 8 7.278 0.436 8675.24 52420.45 4034.96 1313.27 210.91 13545.73 30.12 12.37 45.17 36.94 33.91 604 1.5294 8 6.473 0.386 10986.11 58927.16 4661.46 1670.61 254.21 15823.46 39.08 16.34 58.98 55.35 34.65 618 1.4521 9 7.511 0.44 10864.83 70752.05 5723.96 2290.54 329.86 19948.93 56.5 25.24 91.79 87.28 35.19 633 1.4172 9 7.562 0.44 10550.19 65309.85 5100.65 1986.08 284.66 17664.99 41.55 19.94 75.6 71.06 35.86 644 1.4464 8 7.497 0.44 11864.21 73903.75 5914.51 2249.08 327.2 20139.48 54.36 27.05 98.78 95.91 36.53 657 1.5501 22 6.379 0.383 14188.26 82009.86 7060 2749.7 377.02 21915.92 61.28 33.04 131.09 133.61 37.13 671 1.5146 10 5.856 0.342 13701.53 82750.74 7037.17 2734.42 397.93 22580.58 67.35 35.43 135.25 129.3 37.66 683 1.3973 7 7.165 0.405 13075.75 75852.25 6209.29 2592.06 350.29 21149.85 58.61 28.87 109.44 97.73 38.26 694 1.4541 6 8.097 0.462 12214.99 71625.73 5698.03 2334.74 332.31 20365.09 55.38 26.44 94.37 91.32 38.92 706 1.4407 6 7.524 0.429 12431.02 77483.46 6131.46 2382.56 298.59 19789.27 56.48 31 111.34 105.37 39.60 719 1.4268 7 7.301 0.434 8801.51 53400.57 3794.11 1237.26 182.1 12844.24 29.96 12.31 40.07 33.17 40.18 733 1.4498 11 7.093 0.424 12389.36 77196.01 6099.81 2363.14 331.53 20109.35 59.08 29.69 105.94 98.94 40.81 745 1.4646 16 7.868 0.456 11497.96 68470.68 5378.19 2043.82 296.31 18635.18 51.28 22.54 80.55 75.74 41.51 757 1.5406 13 5.636 0.343 10594.98 65346.91 5098.53 1803.89 261.97 17452.31 45.05 19.42 71.45 66.13 42.16 771 1.5962 6 5.963 0.353 8754.31 53793.27 3770.16 1509.71 205.35 14932.86 34.41 11.86 40.93 34.55 42.76 784 1.433 5 7.076 0.399 10239.13 57359.7 4327.49 1458.28 226.14 14674.5 35.78 14.84 53.35 46.61 43.51 796 1.4002 6 7.703 0.432 10246.42 52636.6 3919.79 1295.48 199.65 13454.91 31.12 11.72 39.49 34.22 44.14 812 1.4356 9 7.282 0.419 10308.02 60402.2 4576.8 1473.03 211.82 14621.8 34.61 16.49 58.13 55.51 44.81 825 1.4931 5 7.531 0.404 12269.81 71356.84 5551.31 1986.69 271.86 18124.53 47.69 24.39 86.53 79.79 45.46 838 1.4531 3 6.508 0.376 14485.48 73590.92 6020.92 2197.88 297.74 18826.91 55.37 28.66 100.29 93.52 46.14 851 1.4223 8 6.62 0.384 15557.84 82784.42 6809.22 2688.87 360.95 22454.56 62.07 35.5 122.09 116.43 46.78 865 1.5265 18 6.334 0.366 15831.12 78154 6529.57 2549.18 336.45 20656.96 59.34 33.02 113.75 105.93 47.44 878 1.4874 4 6.249 0.358 15016 82510.68 6816.18 2564.28 380.83 21175.28 61.43 35.74 124.41 124.8 48.14 891 1.4007 4 7.11 0.405 10934.98 64002.73 4946.64 1737.55 245.29 15460.03 44.72 19.29 65.01 55.11 48.77 905 1.3372 7 7.055 0.408 12700.92 70366.33 5270.7 1906.17 261.03 17742.63 47.27 24.97 83.5 75.41 49.47 917 1.3658 19 7.059 0.409 12585.52 70629.15 5360.89 1980.45 264.74 18161.2 53.59 26.22 85.42 78.36 50.25 931 1.4921 7 6.761 0.391 14257.5 77073.21 5991.67 2287.92 296.27 20933.57 58.29 33.17 106.87 103.66 51.50 948 1.4289 5 6.277 0.365 17726.91 81520.53 6573.08 2561.85 338.27 23892.74 63.4 37.4 118.12 112.57