# Atmospheric CH4, Interpolar Difference and Excesss Methane Data from the WAIS Divide, GISP2, and NEEM Ice Cores, Last Glacial Maximum and Deglaciation #----------------------------------------------------------------------- # 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/38619 # 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-icecore-38619.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Ice Cores # # Dataset_DOI: # # Science_Keywords: Atmospheric Gas Reconstruction, Last Glacial Maximum, Younger Dryas, carbon cycle, centennial resolution #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/icecore/riddell-young2023/riddell-young2023-ch4xs.txt # Data_Download_Description: NOAA Template File; GISP2 and NEEM Excess Methane Data # #--------------------------------------- # Contribution_Date # Date: 2023-10-06 #--------------------------------------- # File_Last_Modified_Date # Date: 2023-10-06 #--------------------------------------- # Title # Study_Name: Atmospheric CH4, Interpolar Difference and Excesss Methane Data from the WAIS Divide, GISP2, and NEEM Ice Cores, Last Glacial Maximum and Deglaciation #--------------------------------------- # Investigators # Investigators: Riddell-Young, Ben (https://orcid.org/0000-0001-5937-4726); Rosen, Julia; Brook, Edward; Buizert, Christo; Martin, Kaden; Lee, James; Edwards, Jon; Mühl, Michaela; Schmitt, Jochen; Fischer, Hubertus; Blunier, Thomas #--------------------------------------- # Description_Notes_and_Keywords # Description: Site locations - WAIS Divide: -79.468 S, -112.086 W, 1797m; GISP2: 72.583333 N, -38.466667 W, 3200m; NEEM: 77.45 N, -51.066667 W, 2450m. This study includes measurements of atmospheric methane from samples from the NEEM, GISP2 and WAIS Divide ice cores. # All measurements were made at the Oregon State University Ice Core and Quaternary Geochemistry Laboratory (Corvallis, OR) using an established analytical system. 433 samples from the NEEM ice core were measured between 1420 and 1560m depths. A measurement uncertainty ranging from 2.8 to 4.2 ppb, depending on the measurement year, was determined from replicate samples. 340 samples from the GISP2 ice core were measured between 1740 and 2060m depths. A measurement uncertainty ranging from 3.1 to 3.4 ppb, depending on the measurement year, was determined from replicate samples. All GISP2 and NEEM data were corrected for excess methane contamination using the established relationship between excess methane and Ca2+ (Lee et al., 2020). Both corrected and uncorrected data are included in the publication. 340 samples from the GISP2 ice core were measured between 1957 and 3081m depths. A measurement uncertainty ranging from 3.1 to 3.4 ppb, depending on the measurement year, was determined from replicate samples. Depths reflect the mid-points of the depth range of each samples, which is typically ~8cm. (Lee et al.(2020) DOI: 10.1016/j.gca.2019.11.020.) # This study includes estimates of the atmospheric methane relative interpolar difference (rIPD) across the Last Glacial Maximum and Deglaciation. The rIPD was calculated using discrete, high-resolution methane measurements from the WAIS Divide, NEEM and GISP2 ice cores. Two independent IPD records were determined: One using NEEM and WAIS and one using GISP2 and WAIS. The dataset includes rIPD values calculated using both Greenland methane data both corrected and uncorrected for excess methane (Lee et al., 2020). The rIPD was calculated by smoothing each methane record and synchronizing them to the WD2014 gas age scale. 1-sigma rIPD uncertainties are included. This dataset also includes the output of the four-box troposphere model used to interpret the rIPD. For both excess methane-corrected records, the model output and 1-sigma uncertainty is provided for northern extratropical (30N - 90N) and total tropical (30S - 30N) sources in Tg yr-1. For the NEEM-derived rIPD, sections of the rIPD where atmospheric methane changed rapidly were deemed untrustworthy were removed from the dataset. (Lee et al.(2020) DOI: 10.1016/j.gca.2019.11.020.) # This study includes new measurements of in-situ, non-atmospheric methane release during the melt-refreeze analysis of ice samples for atmospheric methane measurement, also known as excess methane (CH4xs). All measurements were made at the Oregon State University Ice Core Laboratory and followed the methods of Lee et al., 2020 and Mitchell et al., 2013. Measurements were made using ice from the GISP2 and NEEM ice cores in 2018, 2019, and 2021. In total, 70 new measurements were made on NEEM ice and 406 measurements on GISP2 ice. The Ca2+ content of the ice was calculated using the published Ca2+ concentration records, and the mass and depth ranges of each sample. For GISP2, the year the measurement was made is included.  # Provided Keywords: Methane, Last Glacial Maximum, Deglaciation, Greenhouse gases, terrestrial biogeochemistry #--------------------------------------- # Publication # Authors: Riddell-Young, Ben; Julia Rosen; Edward Brook; Christo Buizert; Kaden Martin; James Lee; Jon Edwards; Michaela Mühl; Jochen Schmitt; Hubertus Fischer; Thomas Blunier # Published_Date_or_Year: 2023 # Published_Title: Tropical sources mainly controlled last glacial maximum and deglacial methane variability # Journal_Name: Nature Geoscience # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: # Online_Resource: # Full_Citation: # Abstract: Constraining the causes of past atmospheric methane variability is important for understanding links between methane and climate. Abrupt methane changes during the last deglaciation have been intensely studied for this purpose, but the relative importance of high-latitude and tropical sources remains poorly constrained. The methane interpolar concentration difference reflects past geographic emission variability, but existing records suffered from subtle but significant methane production during analysis. Here, we report an ice-core derived interpolar difference record covering the last glacial maximum and deglaciation, with substantially improved temporal resolution, chronology, and a critical correction for methane production in samples from Greenland. Using box-models to infer latitudinal source changes, we show that tropical sources dominated abrupt methane variability of the deglaciation, highlighting their sensitivity to abrupt climate change and rapidly shifting tropical rainfall patterns. Northern extratropical emissions began increasing at ~16 thousand years ago, likely through wetland expansion and/or permafrost degradation induced by high-latitude warming, and contributed at most 25 Tg yr-1 (45% of the total emission increase) to the abrupt methane rise that coincided with rapid northern warming at the onset of the Bølling-Allerød interval. These constraints on deglacial climate-methane cycle interactions can improve the understanding of possible present and future feedbacks. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 1745078 #--------------------------------------- # Site_Information # Site_Name: GISP2 and NEEM Ice Cores # Location: Greenland # Northernmost_Latitude: 77.45 # Southernmost_Latitude: 72.583333 # Easternmost_Longitude: -38.466667 # Westernmost_Longitude: -51.066667 # Elevation_m: #--------------------------------------- # Data_Collection # Collection_Name: GISP2 and NEEM CH4xs Riddell-Young2023 # First_Year: 48100 # Last_Year: 11500 # Time_Unit: calendar year before present # Core_Length_m: # Parameter_Keywords: atmospheric gas # Notes: Gas Age chronologies are not inccluded in this dataset. The most recently updated chronologies should be used for each ice core. #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # 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) # ## GISP2_Depth depth,,,meter,,ice cores,,,N,Mean Depth of sample in GISP2 ice core; Sample depth range is typically ~8cm ## GISP2_CH4xs methane,,,picomole,,ice cores,,Gas Chromatography,N,Measured Excess methane for GISP2 samples ## GISP2_Ca2+ calcium,,,micromole ,,ice cores,,,N,Calculated Ca2+ content for GISP2 samples ## GISP2_meas_year collection date,,,year,,ice cores,,,N,Year of GISP2 sample measurement ## NEEM_Depth depth,,,meter,,ice cores,,,N,Mean Depth of sample in NEEM ice core; Sample depth range is typically ~8cm ## NEEM_CH4xs methane,,,picomole,,ice cores,,Gas Chromatography,N,Measured Excess methane for NEEM samples ## NEEM_Ca2+ calcium,,,micromole ,,ice cores,,,N,Calculated Ca2+ content for NEEMN samples #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NaN GISP2_Depth GISP2_CH4xs GISP2_Ca2+ GISP2_meas_year NEEM_Depth NEEM_CH4xs NEEM_Ca2+ 1768.29 -0.48 0.03 2018 1425.66 0.39 0.12 1768.29 -1.08 0.03 2018 1428.4 5.68 0.06 1772.27 -0.58 0.03 2018 1430.6 -0.31 0.15 1776.19 0.52 0.03 2018 1431.7 3.09 0.14 1776.19 -0.35 0.03 2018 1441.13 3.54 0.17 1780.18 0.20 0.04 2018 1445.535 0.88 0.03 1784.18 -0.57 0.03 2018 1453.7 2.16 0.03 1788.32 1.74 0.03 2018 1491.1 1.52 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2016 NaN NaN NaN 2371.5675 4.71 0.67 2016 NaN NaN NaN 2371.95 3.78 0.56 2016 NaN NaN NaN 2371.95 4.75 0.57 2016 NaN NaN NaN 2372.535 2.03 0.40 2016 NaN NaN NaN 2372.615 1.88 0.31 2016 NaN NaN NaN 2372.895 2.59 0.33 2016 NaN NaN NaN 2372.965 1.10 0.33 2016 NaN NaN NaN 2373.385 1.88 0.22 2016 NaN NaN NaN 2373.465 2.02 0.20 2016 NaN NaN NaN 2374.0375 1.14 0.18 2016 NaN NaN NaN 2374.1125 0.71 0.18 2016 NaN NaN NaN 2374.585 0.54 0.14 2016 NaN NaN NaN 2374.585 0.13 0.14 2016 NaN NaN NaN 2374.92 0.14 0.10 2016 NaN NaN NaN 2374.94 -0.15 0.08 2016 NaN NaN NaN 2374.98 1.30 0.09 2016 NaN NaN NaN 2375.455 0.15 0.12 2016 NaN NaN NaN 2375.455 0.09 0.12 2016 NaN NaN NaN 2375.95 0.00 0.14 2016 NaN NaN NaN 2375.95 0.29 0.14 2016 NaN NaN NaN 2376.455 0.59 0.15 2016 NaN NaN NaN 2376.455 0.60 0.15 2016 NaN NaN NaN 2376.955 1.13 0.14 2016 NaN NaN NaN 2377.455 1.34 0.12 2016 NaN NaN NaN 2377.455 0.16 0.13 2016 NaN NaN NaN 2377.7 0.55 0.14 2018 NaN NaN NaN 2377.855 0.39 0.12 2016 NaN NaN NaN 2377.855 0.01 0.11 2016 NaN NaN NaN 2378.455 0.67 0.10 2016 NaN NaN NaN 2378.955 1.37 0.07 2016 NaN NaN NaN 2378.955 0.06 0.07 2016 NaN NaN NaN 2379.28 -0.02 0.06 2018 NaN NaN NaN 2379.455 1.08 0.08 2016 NaN NaN NaN 2379.455 -0.43 0.08 2016 NaN NaN NaN 2379.78 0.38 0.07 2018 NaN NaN NaN 2379.86 -0.01 0.07 2018 NaN NaN NaN 2379.95 0.39 0.08 2016 NaN NaN NaN 2379.95 0.99 0.08 2016 NaN NaN NaN 2380.485 0.06 0.06 2016 NaN NaN NaN 2380.955 0.20 0.06 2016 NaN NaN NaN 2381.555 0.18 0.05 2016 NaN NaN NaN 2381.95 0.62 0.10 2016 NaN NaN NaN 2382.455 0.39 0.11 2016 NaN NaN NaN 2382.455 0.36 0.12 2016 NaN NaN NaN 2382.955 0.03 0.08 2016 NaN NaN NaN 2382.955 0.73 0.09 2016 NaN NaN NaN 2383.455 1.56 0.07 2016 NaN NaN NaN 2383.455 0.32 0.07 2016 NaN NaN NaN 2383.855 0.24 0.07 2016 NaN NaN NaN 2383.855 0.48 0.07 2016 NaN NaN NaN 2384.455 0.22 0.06 2016 NaN NaN NaN 2384.455 -0.05 0.06 2016 NaN NaN NaN 2384.955 0.90 0.07 2016 NaN NaN NaN 2384.955 -0.36 0.07 2016 NaN NaN NaN 2385.28 0.94 NaN 2016 NaN NaN NaN 2385.455 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2394.955 -0.07 0.09 2016 NaN NaN NaN 2395.455 1.27 0.09 2016 NaN NaN NaN 2395.95 -0.04 0.09 2016 NaN NaN NaN 2396.455 -0.26 0.08 2016 NaN NaN NaN 2396.955 -0.02 0.07 2016 NaN NaN NaN 2397.545 1.02 0.09 2016 NaN NaN NaN 2397.545 0.02 0.09 2016 NaN NaN NaN 2397.95 0.48 0.11 2016 NaN NaN NaN 2397.95 0.23 0.11 2016 NaN NaN NaN 2398.29 0.53 0.09 2016 NaN NaN NaN 2398.29 0.12 0.08 2018 NaN NaN NaN 2399.045 -0.06 0.09 2016 NaN NaN NaN 2399.455 0.47 0.11 2016 NaN NaN NaN