# Polar Ice Core 42-77ka Excess Methane Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/27610 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/lee2020ch4.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Ice Core # # Dataset DOI: # # Parameter_Keywords: atmospheric gas, instrumental data #-------------------- # Contribution_Date # Date: 2020-01-02 #-------------------- # File_Last_Modified_Date # Date: 2020-01-02 #-------------------- # Title # Study_Name: Polar Ice Core 42-77ka Excess Methane Data #-------------------- # Investigators # Investigators: Lee, J.E.; Edwards, J.S.; Schmitt, J.; Fischer, H.; Bock, M.; Brook, E.J. #-------------------- # Description_Notes_and_Keywords # Description: Excess CH4 data from the NEEM, GISP2, WAIS Divide, RICE, and SPICE polar ice cores for 42.7-77 ka, # plus updated and previously unpublished CH4 measurements of samples from the GISP2 ice core (file lee2020ch4-gisp2.txt). # North Greenland Eemian (NEEM) and Greenland Ice Sheet Project II (GISP2) Greenland ice cores, and the WAIS Divide (WD), # Roosevelt Island Climate Evolution (RICE), and South Pole Ice Core project (SPICE) ice cores, Antarctica. # Data include ice core CH4 concentration following successive melt-extraction steps, the change in concentration # after successive melt-extraction steps, and the inferred release/production of CH4 in the sample. # Ice samples are from the GISP2 and NEEM ice cores from Greenland, the WD, RICE, and SPICE ice cores from Antarctica, # and bubble-free ice samples manufactured at Oregon State University. #-------------------- # Publication # Authors: James E. Lee, Jon S. Edwards, Jochen Schmitt, Hubertus Fischer, Michael Bock, Edward J. Brook # Published_Date_or_Year: 2020-02-01 # Published_Title: Excess methane in Greenland ice cores associated with high dust concentrations # Journal_Name: Geochemica et Cosmochemica Acta # Volume: 270 # Edition: # Issue: # Pages: 409-430 # Report_Number: # DOI: 10.1016/j.gca.2019.11.020 # Online_Resource: https://www.sciencedirect.com/science/article/pii/S0016703719307288 # Full_Citation: # Abstract: Ice core records of atmospheric methane (CH4) and its isotopic composition provide important information about biogeochemical cycles in the past. Interpreting these data requires that they faithfully record the composition of the atmosphere. In this study, we describe anomalies of up to 30-40 ppb CH4 that are only observed in dust-rich (>~60 ng Ca/g ice), glacial-period ice measured with standard melt-refreeze methods. The stable isotopic composition of CH4 is also significantly affected. Results from the GISP2 and NEEM ice cores from Greenland show that excess CH4 is either released or produced in the presence of liquid water in amounts which are highly correlated with the abundance of Ca2+ and mineral dust in the sample. Additional experiments show that excess CH4 is unaffected by the addition of HgCl2 (a microbial inhibitor) and is not related to ice core storage time. Dust concentrations in Antarctic ice cores are an order of magnitude lower than in Greenlandic ice cores and no excess CH4 was observed in samples from the Antarctic WAIS Divide (WD) and South Pole (SPICE) ice cores. While the overall structure of the ice core atmospheric methane history is minimally impacted by excess CH4, the impacts on the isotopic record and on inverse models used to reconstruct CH4 sources are greater. We propose three potential mechanisms to explain the presence of excess CH4: (1) that CH4 is adsorbed on dust particles prior to deposition on the ice sheet and is slowly desorbed during the melt-extraction step of sample analysis; (2) that dust acts as a micro-environment within the ice sheet for methanogenic extremophiles; or (3) that excess CH4 is a product of abiotic degradation of organic compounds during the melt-extraction step of sample analysis. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation PIRE # Grant: 0968391 #------------------ # Funding_Agency # Funding_Agency_Name: European Research Council (ERC) # Grant: 226172 #------------------ # Funding_Agency # Funding_Agency_Name: Swiss National Science Foundation # Grant: #------------------ # Site_Information # Site_Name: West Antarctic Ice Sheet (WAIS) Divide Ice Core # Location: Antarctica # Country: # Northernmost_Latitude: -79.4676 # Southernmost_Latitude: -79.4676 # Easternmost_Longitude: 112.0865 # Westernmost_Longitude: 112.0865 # Elevation: 1766 m #------------------ # Site_Information # Site_Name: South Pole Ice Core (SPICEcore) # Location: Antarctica # Country: # Northernmost_Latitude: -89.99 # Southernmost_Latitude: -89.99 # Easternmost_Longitude: -99.16 # Westernmost_Longitude: -99.16 # Elevation: 2835 m #--------------------------------------- # Site Information # Site_Name: NEEM # Location: North America>Greenland # Country: # Northernmost_Latitude: 77.75 # Southernmost_Latitude: 77.75 # Easternmost_Longitude: -51.1 # Westernmost_Longitude: -51.1 # Elevation: 2484 m #--------------------------------------- # Site Information # Site_Name: GISP2 # Location: North America>Greenland # Country: # Northernmost_Latitude: 72.6 # Southernmost_Latitude: 72.6 # Easternmost_Longitude: -38.5 # Westernmost_Longitude: -38.5 # Elevation: 3200 m #--------------------------------------- # Data_Collection # Collection_Name: Lee2020CH4 # Earliest_Year: 76829 # Most_Recent_Year: 22365 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: Gas ages for samples are provided on the respective age scales. # - NEEM - GICC05 Age Scale (Rasmussen et al. (2013), "A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice corei." Clim. Past.) # - GISP2 - GICC05 Age Scale (Rasmussen et al. (2014), "A stratigraphic framework for abrupt climatic changes during the Last Glacial period based on three synchronized Greenland ice-core records: refining and extending the INTIMATE event stratigraphy." Quaternary Science Reviews 106, 14-28.; Seierstad et al. (2014), "Greenland GRIP, GISP2 and NGRIP ice cores for the past 104 ka reveal regional millennial-scale d18Ogradients with possible Heinrich event imprint." Quaternary Science Reviews 106, 29-46.) # - WD - WD2014 Age Scale (Buizert et al. (2015), "The WAIS-Divide deep ice core WD2014 chronology - Part 2: Methane synchronization (68-31 ka BP) and the gas age-ice age difference." Clim. Past) # - RICE - RICE17 Age Scale (Lee et al. (2019), "An 83,000 year old ice core from Roosevelt Island, Ross Sea, Antarctica." Clim. Past Disc.) # - SPICE - As of this publication, no official age scale exists for the SPICE. # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # # Core Core Name,,,,,,,,C, # Top_Depth Sample Top Depth,,,meter,,,,,N,mean depth below surface of typically 10 cm long samples # Gas_Age Age,gas,,year Before Present,,,,,N,Gas Age of Top Depth before 1950 CE # CH4_primary methane,,,parts per billion,,ice core,,,N,mean [CH4] value of first measurement set # CH4_secondary methane,,,parts per billion,,ice core,,,N,mean [CH4] value of second measurement set # Delta_CH4 Delta [CH4],,,parts per billion,,ice core,,,N, # n_xs n*_xs,,,picomoles,,ice core,,,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # Core Top_Depth Gas_Age CH4_primary CH4_secondary Delta_CH4 n_xs Blank 0 NaN 502.58 517.58 15 1.146 Blank 0 NaN 502.69 514.71 12.03 0.592 Blank 0 NaN 504.18 508.42 4.24 -0.011 Blank 0 NaN 498.85 505.11 6.26 0.343 Blank 0 NaN 501.77 503.31 1.54 0.14 Blank 0 NaN 500.81 499.98 -0.83 -0.107 Blank 0 NaN 501.29 508.07 6.79 0.13 Blank 0 NaN 501.34 503.92 2.59 0.152 Blank 0 NaN 500.29 501.61 1.32 0.032 Blank 0 NaN 499.14 508.35 9.2 0.269 Blank 0 NaN 500.54 504.38 3.84 0.015 Blank 0 NaN 498.81 499.08 0.26 -0.204 Blank 0 NaN 500.25 500.59 0.34 -0.074 Blank 0 NaN 500.29 510.37 10.08 0.366 Blank 0 NaN 501.43 503.17 1.75 -0.068 Blank 0 NaN 499.33 498.71 -0.62 -0.374 Blank 0 NaN 500.75 500.41 -0.34 -0.316 Blank 0 NaN 502.26 508.96 6.7 0.212 Blank 0 NaN 499.12 500.64 1.52 0.059 Blank 0 NaN 500.34 506.86 6.53 0.067 Blank 0 NaN 498.03 500.24 2.2 -0.251 Blank 0 NaN 498.36 500.51 2.14 -0.269 Blank 0 NaN 500.2 504.45 4.25 0.139 Blank 0 NaN 500.13 503.26 3.13 -0.042 Blank 0 NaN 503.04 504.74 1.7 -0.083 Blank 0 NaN 497.7 506.43 8.73 0.054 Blank 0 NaN 499.71 507.08 7.37 0.062 Blank 0 NaN 500.57 498.4 -2.17 -0.197 Blank 0 NaN 500.12 502.91 2.79 0 Blank 0 NaN 500.98 503.66 2.68 0.09 Blank 0 NaN 500.59 506.16 5.57 0.282 Blank 0 NaN 499.91 506.72 6.82 0.288 Blank 0 NaN 500.18 501.6 1.42 -0.223 Blank 0 NaN 502.01 515.5 13.49 0.347 Blank 0 NaN 504.62 516.18 11.56 0.308 Blank 0 NaN 500.91 503.17 2.26 -0.267 Blank 0 NaN 500.5 504.34 3.84 -0.11 Blank 0 NaN 500.51 501.41 0.89 -0.172 Blank 0 NaN 499.56 510.29 10.73 0.224 Blank 0 NaN 502.18 505.52 3.34 -0.07 Blank 0 NaN 499.93 502.41 2.48 -0.031 Blank 0 NaN 499.88 503.67 3.78 -0.089 Blank 0 NaN 499.85 499.2 -0.64 -0.226 Blank 0 NaN 501.1 504.42 3.31 -0.155 Blank 0 NaN 503.04 509.6 6.56 -0.139 Blank 0 NaN 500.08 503.36 3.27 -0.256 Blank 0 NaN 500.85 510.37 9.52 0.075 Blank 0 NaN 499.77 511.28 11.52 0.16 Blank 0 NaN 501.63 507.21 5.58 -0.148 Blank 0 NaN 502.94 509.37 6.43 0.13 Blank 0 NaN 502.44 508.62 6.18 0.062 Blank 0 NaN 480.02 481.82 1.8 0.096 Blank 0 NaN 486.45 494.42 7.97 0.582 Blank 0 NaN 477.21 479.64 2.43 -0.076 Blank 0 NaN 477.06 476.27 -0.8 0.024 Blank 0 NaN 478.2 476.42 -1.78 -0.404 Blank 0 NaN 478.89 476.91 -1.98 -0.645 Blank 0 NaN 476.59 475.04 -1.56 -0.236 Blank 0 NaN 477.29 478.71 1.41 0.013 Blank 0 NaN 477.96 478.31 0.35 0.462 Blank 0 NaN 477.56 478.83 1.27 -0.003 Blank 0 NaN 476.5 482.32 5.82 0.311 blank 0 NaN 477.65 480.35 2.7 0.007 Blank 0 NaN 479.96 478.45 -1.51 -0.46 Blank 0 NaN 479.72 483.7 3.98 -0.088 Blank 0 NaN 477.32 483.87 6.56 -0.444 Blank 0 NaN 477.99 486.27 8.28 -0.493 GISP2 2301.9 42702 494.53 510.24 15.72 0.853 GISP2 2302.4 42729 501.59 513.25 11.66 0.093 GISP2 2303.4 42787 520.78 531.95 11.16 0.062 GISP2 2304.41 42851 509.84 531.99 22.14 1.339 GISP2 2306.51 42948 503.34 542.23 38.89 3.062 GISP2 2307.1 42973 506.7 544.73 38.04 2.772 GISP2 2307.9 43003 505.35 545.88 40.54 2.237 GISP2 2308.51 43027 511.25 544.42 33.17 2.327 GISP2 2309.1 43054 508.84 535.44 26.6 1.781 GISP2 2309.6 43076 511.08 549.26 38.18 2.332 GISP2 2311.9 43186 510.9 543.09 32.19 2.262 GISP2 2312 43191 514.25 540.31 26.06 2.111 GISP2 2312.91 43244 515.09 540.27 25.19 1.478 GISP2 2313.41 43270 511.28 525.79 14.51 0.119 GISP2 2313.81 43292 501.59 514.8 13.21 0.79 GISP2 2354.41 46245 516.41 526.8 10.39 0.952 GISP2 2355.81 46310 529.29 541.04 11.75 0.836 GISP2 2356.41 46339 529.35 536.54 7.19 0.333 GISP2 2356.91 46362 525.97 539.69 13.73 0.913 GISP2 2357.81 46405 527.66 536.08 8.42 0.109 GISP2 2358.48 46439 529.04 534.55 5.51 0.534 GISP2 2358.48 46439 528.54 534.83 6.29 0.103 GISP2 2358.91 46461 524.37 533.1 8.72 0.689 GISP2 2358.91 46461 522.35 533.06 10.71 0.66 GISP2 2359.41 46482 545.46 572.6 27.14 2.617 GISP2 2359.41 46482 543.4 564.36 20.96 1.586 GISP2 2359.81 46496 541.87 569.56 27.69 2.749 GISP2 2359.81 46496 534.35 555.65 21.31 1.727 GISP2 2360.41 46514 537.48 569.44 31.95 2.748 GISP2 2360.41 46514 533.21 567.29 34.08 2.88 GISP2 2360.8 46525 544.36 604.52 60.16 5.136 GISP2 2360.8 46525 548.65 609.21 60.56 5.297 GISP2 2361.51 46547 539.1 571.93 32.84 2.979 GISP2 2361.51 46547 539.83 567.87 28.04 2.063 GISP2 2361.81 46556 543.31 582.05 38.74 3.495 GISP2 2361.81 46556 545.3 579.14 33.84 2.576 GISP2 2362.41 46574 549.69 583.97 34.28 2.184 GISP2 2362.41 46574 549.76 585.7 35.94 2.799 GISP2 2362.9 46587 549.18 558.73 9.55 0.532 GISP2 2362.9 46587 548.09 565.06 16.97 1.15 GISP2 2363.4 46602 548.13 585.81 37.69 2.405 GISP2 2363.4 46602 547.25 583.4 36.14 2.325 GISP2 2363.81 46615 546.34 560.98 14.63 0.26 GISP2 2363.81 46615 547.56 578.32 30.76 1.862 GISP2 2364.41 46636 549.66 589.07 39.4 2.735 GISP2 2364.41 46636 552.92 590.01 37.09 2.777 GISP2 2364.91 46657 545.89 572.77 26.88 1.692 GISP2 2364.91 46657 548.78 587.43 38.65 2.725 GISP2 2366.26 46722 557.42 594.51 37.09 2.502 GISP2 2366.5 46735 560.73 602.81 42.08 2.945 GISP2 2367.1 46770 559.21 592.09 32.87 2.168 GISP2 2367.73 46810 555.42 594.46 39.03 2.781 GISP2 2368.5 46869 500.41 540.18 39.77 3.157 GISP2 2368.57 46876 485.58 518.66 33.08 2.704 GISP2 2368.75 46892 467.34 511.85 44.51 3.385 GISP2 2369.9 47030 466.39 510.48 44.09 3.296 GISP2 2369.9 47030 470.32 510.05 39.73 3.036 GISP2 2370.35 47085 465.23 495.29 30.06 2.18 GISP2 2370.43 47094 472.63 522.22 49.59 4.246 GISP2 2371 47164 472.99 520.79 47.8 4.073 GISP2 2371 47164 473.6 537 63.39 5.154 GISP2 2371.46 47220 471.95 523.22 51.26 4.338 GISP2 2371.53 47228 476.05 526.02 49.98 3.872 GISP2 2371.9 47271 471.04 513.03 41.98 3.513 GISP2 2371.9 47271 468.5 514.15 45.65 3.657 GISP2 2372.5 47334 463.4 491.39 27.98 1.653 GISP2 2372.58 47342 465.19 493.84 28.65 2.121 GISP2 2372.86 47371 461.8 489.61 27.81 2.097 GISP2 2372.93 47378 461.44 479.6 18.16 1.239 GISP2 2373.35 47419 457.3 480.03 22.73 1.463 GISP2 2373.43 47427 459.84 481.21 21.38 1.436 GISP2 2374 47494 454.46 472.17 17.71 1.024 GISP2 2374.07 47503 458.08 469.97 11.9 0.427 GISP2 2374.54 47560 453.45 463.13 9.68 0.352 GISP2 2374.54 47560 457.29 464.18 6.89 0.112 GISP2 2374.88 47597 451.65 457.8 6.14 0.11 GISP2 2374.88 47597 454.89 463.37 8.48 0.202 GISP2 2374.96 47606 451.7 466.17 14.47 0.769 GISP2 2375.41 47658 457.61 462.98 5.37 0.141 GISP2 2375.41 47658 454.57 461.05 6.48 0.03 GISP2 2375.9 47722 455.84 465.66 9.81 -0.015 GISP2 2375.9 47722 454.14 468.96 14.82 0.257 GISP2 2376.41 47786 453.67 464.27 10.6 0.363 GISP2 2376.41 47786 454.75 467.05 12.3 0.459 GISP2 2376.91 47856 454.8 471.17 16.38 0.976 GISP2 2377.41 47921 458.34 470.38 12.04 1.01 GISP2 2377.41 47921 457.99 464.41 6.42 0.087 GISP2 2377.81 47972 460.22 473.06 12.84 0.242 GISP2 2377.81 47972 457.33 465.03 7.7 0.026 GISP2 2378.41 48048 463.57 477.47 13.9 0.647 GISP2 2378.91 48113 469.85 477.47 7.62 0.725 GISP2 2378.91 48113 469.23 471.77 2.53 -0.018 GISP2 2379.41 48173 444.29 454.74 10.45 0.769 GISP2 2379.41 48173 444.43 445.83 1.39 -0.297 GISP2 2379.9 48228 424.87 433.38 8.51 0.242 GISP2 2379.9 48228 424.46 438.35 13.88 0.62 GISP2 2380.44 48287 415.33 421.58 6.25 0.01 GISP2 2380.91 48334 417.32 425.23 7.91 0.076 GISP2 2381.51 48391 423.42 427.39 3.97 0.067 GISP2 2381.9 48424 419.19 429.92 10.73 0.263 GISP2 2382.41 48462 428.61 437.49 8.88 0.308 GISP2 2382.41 48462 428.64 436.87 8.23 0.068 GISP2 2382.91 48501 444.36 452.86 8.5 0.249 GISP2 2382.91 48501 441.29 450.03 8.74 0.219 GISP2 2383.41 48541 454.53 469.97 15.45 0.893 GISP2 2383.41 48541 454.52 466.82 12.31 0.202 GISP2 2383.81 48570 454.32 464.08 9.76 0.134 GISP2 2383.81 48570 450.31 461.76 11.45 0.434 GISP2 2384.41 48617 446.89 453.55 6.67 0.022 GISP2 2384.41 48617 446.34 450.15 3.81 0.041 GISP2 2384.91 48660 445.7 456.68 10.99 0.323 GISP2 2384.91 48660 444.24 448.15 3.91 -0.073 GISP2 2385.41 48702 450.79 464.47 13.68 0.711 GISP2 2385.41 48702 447.47 458.35 10.88 0.316 GISP2 2385.9 48738 456.26 476.35 20.09 1.263 GISP2 2385.9 48738 457.37 476.97 19.6 1.203 GISP2 2386.34 48770 461.27 490.53 29.26 2.222 GISP2 2386.34 48770 461.02 483.57 22.54 1.554 GISP2 2386.9 48808 477.34 494.6 17.26 0.91 GISP2 2386.91 48809 479.86 505.14 25.28 1.88 GISP2 2387.41 48844 483.84 519.61 35.77 2.661 GISP2 2387.41 48844 483.07 507.4 24.33 1.868 GISP2 2387.9 48873 485.68 501.17 15.49 0.773 GISP2 2387.9 48873 482.51 496.75 14.24 0.688 GISP2 2388.91 48935 490.47 497.17 6.7 0.074 GISP2 2388.91 48935 491.41 507.52 16.11 0.894 GISP2 2389.41 48971 475.83 482.09 6.26 -0.051 GISP2 2389.41 48971 477.45 484.59 7.14 0.051 GISP2 2389.81 49001 465.39 476.11 10.73 0.376 GISP2 2389.81 49001 462.86 476.17 13.3 0.6 GISP2 2390.41 49050 457.5 461.54 4.04 0.01 GISP2 2390.41 49050 460.74 477.9 17.16 1.12 GISP2 2390.91 49087 452.08 459.94 7.86 0.064 GISP2 2391.41 49123 463.35 471 7.65 -0.016 GISP2 2391.9 49156 482.19 498.9 16.71 1.154 GISP2 2392.41 49190 497.17 500.99 3.82 -0.127 GISP2 2392.91 49224 502.63 507.42 4.79 0.06 GISP2 2393.41 49261 478.97 492.89 13.91 0.462 GISP2 2393.81 49294 454.76 459.88 5.11 -0.039 GISP2 2393.81 49294 453.05 467.13 14.09 0.819 GISP2 2394.41 49348 442.7 454.71 12.01 0.046 GISP2 2394.91 49398 445.02 450.81 5.79 0.08 GISP2 2395.41 49445 434.69 452.16 17.46 0.803 GISP2 2395.9 49486 432.17 436.74 4.57 -0.109 GISP2 2396.41 49527 445.22 451.46 6.24 -0.12 GISP2 2396.91 49562 454.63 460.42 5.78 -0.038 GISP2 2397.5 49605 459.82 470.64 10.83 0.246 GISP2 2397.5 49605 459.42 466.26 6.84 0.023 GISP2 2397.9 49633 461.02 468.26 7.24 0.17 GISP2 2397.9 49633 464.83 474.74 9.91 0.669 GISP2 2398.24 49657 463.16 474.9 11.74 0.205 GISP2 2398.24 49657 464.34 470.44 6.1 0.128 GISP2 2399 49719 475.83 478.77 2.94 -0.104 GISP2 2399.41 49752 479.84 488.62 8.78 0.196 GISP2 2359.75 46494 555.45 590.45 35 2.783 GISP2 2365.25 46672 560.72 626.44 65.72 4.476 GISP2 2368.75 46892 481.12 529.21 48.09 3.89 GISP2 2370.25 47074 485.32 535.14 49.81 3.785 GISP2 2588.1 72290 546.16 587.86 41.7 3.537 GISP2 2588.1 72290 553.69 588.55 34.86 3.016 GISP2 2588.75 72422 469.6 500.06 30.46 2.538 GISP2 2588.75 72422 472.55 500.46 27.9 2.168 GISP2 2595.01 74088 475.84 485.13 9.29 0.285 GISP2 2595.01 74088 473.58 480.35 6.77 0.188 GISP2 2595.47 74157 525.11 533.77 8.65 0.196 GISP2 2595.47 74157 520.18 529.05 8.87 0.304 GISP2 2597.9 74464 474.81 485.31 10.5 0.381 GISP2 2597.9 74464 475.11 485.49 10.38 0.724 NEEM 1829.85 44584 477.7 481.62 3.93 0.208 NEEM 1830.3 44645 481.47 484.34 2.86 0.166 NEEM 1830.95 44729 491.09 493.23 2.14 0.188 NEEM 1831.4 44792 486.23 492.57 6.34 0.509 NEEM 1832.05 44880 485.1 487.98 2.88 0.185 NEEM 1832.5 44936 488.25 491.24 2.99 0.532 NEEM 1837.55 45478 523.3 532.51 9.22 0.869 NEEM 1838 45518 515.12 520.46 5.34 0.345 NEEM 1839.84 45673 522.87 520.85 -2.02 0.064 NEEM 1840.2 45702 530.63 534.05 3.42 0.622 NEEM 1840.85 45757 530.18 538.64 8.46 0.798 NEEM 1841.3 45800 528.22 533.77 5.55 0.509 NEEM 1842 45859 534.66 534.38 -0.28 0.291 NEEM 1842.4 45893 536.86 550.62 13.76 1.573 NEEM 1843.05 45944 536.52 538.34 1.82 0.113 NEEM 1843.5 45978 532.12 541.9 9.78 0.658 NEEM 1844.15 46031 528.28 530.78 2.5 -0.079 NEEM 1844.6 46069 538.19 541.12 2.93 -0.042 NEEM 1845.7 46162 532.69 538.85 6.16 0.152 NEEM 1846.35 46221 536.1 554.44 18.34 1.699 NEEM 1846.8 46261 543.96 562.09 18.13 1.83 NEEM 1847.5 46318 543.09 572.4 29.31 3.004 NEEM 1847.72 46333 540.36 563.6 23.24 2.284 NEEM 1848.64 46397 542.86 566.37 23.51 2.141 NEEM 1848.9 46413 547.67 570.88 23.21 2.515 NEEM 1849 46419 548.56 566.48 17.92 1.93 NEEM 1850 46482 539.19 560.48 21.29 1.487 NEEM 1850.75 46535 554.48 577.11 22.63 1.937 NEEM 1851.2 46569 554.97 579.87 24.9 1.991 NEEM 1852.95 46701 558.72 585.03 26.31 2.146 NEEM 1853.27 46723 558.11 582.02 23.91 2.659 NEEM 1853.37 46730 560.53 589.73 29.21 2.738 NEEM 1854.05 46788 559.93 601.54 41.61 4.076 NEEM 1854.5 46837 512.34 541.19 28.85 2.48 NEEM 1855.15 46929 491.8 556.85 65.05 6.21 NEEM 1855.6 46998 490.47 532.87 42.4 3.901 NEEM 1856.25 47088 473.15 484.96 11.82 1.007 NEEM 1856.7 47143 467.29 481.78 14.49 1.241 NEEM 1857.35 47233 465.49 477.6 12.11 1.055 NEEM 1857.8 47296 471.43 475.85 4.42 0.324 RICE 706.5 22365 371.1 392.2 21.1 2.288 RICE 709.48 23898 390.88 411.97 21.1 2.268 RICE 725.1 39185 437.08 461.17 24.08 2.11 RICE 726.07 39922 428.07 449.58 21.51 1.955 RICE 730 47414 461.14 485.68 24.54 2.021 RICE 735.6 50672 484.05 510.3 26.25 2.422 RICE 742 58146 587.52 623.86 36.34 4.004 RICE 746 64600 481.86 512.25 30.4 3.164 RICE 747.6 76829 605.4 620.32 14.93 0.973 RICE 748 75493 482.44 498.31 15.87 0.926 RICE 754.4 NaN 613.42 638.37 24.95 1.865 SPICE 1273.06 NaN 372.77 380.95 8.18 0.775 SPICE 1275.09 NaN 371.75 378.55 6.8 0.056 SPICE 1279.08 NaN 384.41 391.52 7.12 0.282 SPICE 1281.09 NaN 392.18 397.05 4.87 0.281 SPICE 1283.07 NaN 399.52 413.48 13.96 1.197 SPICE 1287.05 NaN 447.94 453.06 5.12 -0.313 SPICE 1290.97 NaN 435.88 446.28 10.4 0.856 SPICE 1299.06 NaN 380.75 389.1 8.35 0.605 SPICE 1301.11 NaN 384.34 396 11.66 0.894 SPICE 1303.12 NaN 387.72 418.47 30.75 2.508 SPICE 1305.09 NaN 387.61 403.86 16.25 1.796 SPICE 1315.07 NaN 398.01 413.07 15.06 1.15 SPICE 1318.12 NaN 387.49 399.69 12.2 0.459 SPICE 1321.1 NaN 395.53 405.01 9.48 0.222 SPICE 1323.1 NaN 409.21 418.23 9.02 0.168 SPICE 1331.06 NaN 403.63 429.98 26.35 2.596 SPICE 1347.04 NaN 458.98 480.83 21.86 1.888 SPICE 1357.11 NaN 395.76 406.18 10.42 0.735 SPICE 1359.14 NaN 396 399.11 3.11 -0.015 WAIS 3116.68 42812 460.59 469.43 8.84 0.496 WAIS 3118.67 42923 473.04 487.93 14.9 0.967 WAIS 3120.67 43035 491.68 495.21 3.53 0.309 WAIS 3124.67 43251 479.51 484.44 4.93 0.427 WAIS 3142.65 44157 411.73 417.16 5.44 0.21 WAIS 3146.65 44383 411.05 417.01 5.96 0.599 WAIS 3160.63 45165 463.47 467.3 3.82 0.553 WAIS 3163.63 45340 469.24 476.58 7.33 1.015 WAIS 3164.63 45397 472.79 473.9 1.11 0.373 WAIS 3170.62 45741 486.1 491.5 5.4 0.358 WAIS 3173.61 45912 499.89 505.9 6.01 0.411 WAIS 3173.62 45912 498.1 507.64 9.54 1.344 WAIS 3175.61 46024 503.93 505.04 1.12 -0.043 WAIS 3177.67 46137 512.02 525.3 13.28 1.958 WAIS 3177.67 46137 508.94 516.5 7.56 1.547 WAIS 3179.61 46242 502.83 504.96 2.13 0.048 WAIS 3179.61 46242 505.49 511.98 6.5 0.737 WAIS 3185.1 46547 500.48 507.36 6.88 0.807 WAIS 3187.09 46658 511.08 514.81 3.72 0.514 WAIS 3189.09 46762 508.86 521.44 12.58 1.603 WAIS 3189.09 46762 512.17 516.01 3.84 0.321 WAIS 3189.09 46762 508.96 511.59 2.64 -0.036 WAIS 3189.09 46762 509.11 516.35 7.24 1.161 WAIS 3191.01 46858 520.52 524.01 3.48 -0.066 WAIS 3191.09 46862 520.26 529.83 9.58 1.293 WAIS 3191.09 46862 520.44 529.01 8.57 0.685 WAIS 3191.09 46862 520.25 525.14 4.89 0.51 WAIS 3193.03 46957 534.88 534.62 -0.26 0.276 WAIS 3193.03 46957 536.63 540.32 3.69 -0.057 WAIS 3193.03 46957 534.78 539.33 4.54 0.309 WAIS 3195.08 47056 510.38 513.17 2.78 -0.11 WAIS 3195.08 47056 513.06 522.32 9.26 0.662 WAIS 3195.08 47056 509.79 524.64 14.86 1.245 WAIS 3197.08 47149 440.35 441.35 1 -0.066 WAIS 3197.08 47149 442.67 447.51 4.83 0.134 WAIS 3197.08 47149 444.01 448.39 4.39 0.034 WAIS 3200.08 47294 447.28 450.54 3.26 -0.012 WAIS 3200.08 47294 447.31 451.91 4.6 0.341 WAIS 3200.08 47294 446.38 448.28 1.9 -0.005 WAIS 3201.08 47343 451.23 464.56 13.33 0.97 WAIS 3201.08 47343 452.6 457.33 4.74 0.343 WAIS 3201.08 47343 450.18 449.21 -0.98 -0.283 WAIS 3203.09 47441 450.79 455.27 4.48 0.394 WAIS 3203.1 47442 449.75 455.3 5.54 0.282 WAIS 3203.1 47442 450.46 449.73 -0.73 -0.114 WAIS 3205.19 47543 442.47 453.29 10.82 0.589 WAIS 3207.08 47636 447.84 451.45 3.61 0.133 WAIS 3207.08 47636 445.36 454.87 9.51 0.828 WAIS 3207.08 47636 447.25 447.17 -0.09 -0.152 WAIS 3207.09 47636 445.8 455.86 10.06 0.796 WAIS 3209.07 47733 444.98 439.93 -5.05 -0.308 WAIS 3221.05 48329 452.14 457.19 5.05 0.331 WAIS 3222.98 48450 405.76 411.83 6.07 0.4 WAIS 3224.05 48521 409.23 413.88 4.65 0.43 WAIS 3225.04 48589 409.05 413.01 3.96 0.097 WAIS 3225.04 48589 409.62 412.87 3.25 0.185 WAIS 3226.09 48664 408.14 417.53 9.39 0.702 WAIS 3226.09 48664 403.69 412.92 9.23 0.839 WAIS 3226.09 48664 408.51 406.74 -1.77 -0.187 WAIS 3227.04 48734 424.27 428.62 4.34 0.314 WAIS 3227.04 48734 421.63 429.53 7.91 0.506 WAIS 3228.04 48811 433.67 436.93 3.26 0.081 WAIS 3228.04 48811 434.99 439.96 4.97 0.364 WAIS 3229.09 48894 428.87 434.13 5.26 0.4 WAIS 3229.09 48894 432.64 445.79 13.15 1.286 WAIS 3231.04 49046 439.4 443.18 3.78 0.191 WAIS 3233.03 49196 471.89 479.89 8 0.389 WAIS 3233.03 49196 473.66 481.25 7.59 0.683 WAIS 3236.03 49403 478.31 481.45 3.15 -0.094 WAIS 3236.03 49403 473.8 476.59 2.79 -0.018 WAIS 3236.03 49403 476.41 483.26 6.85 0.473 WAIS 3237.34 49487 468.12 472.77 4.65 0.207 WAIS 3237.34 49487 468.41 473.38 4.97 -0.073 WAIS 3239.02 49592 427.97 429.3 1.33 -0.055 WAIS 3239.02 49592 428.97 435.91 6.93 -0.005 WAIS 3241.02 49717 420.23 423.63 3.4 -0.098 WAIS 3241.02 49717 417.75 422.71 4.96 -0.133 WAIS 3241.03 49717 421.2 428.67 7.47 0.617 WAIS 3243.03 49839 439.24 441.36 2.12 -0.266 WAIS 3245.01 49950 460.75 464.93 4.19 -0.002 WAIS 3245.02 49951 461.83 468.02 6.2 0.274 WAIS 3247.01 50065 451.33 453.95 2.62 -0.136