RICE_Final_CH4.txt

Citation: James E. Lee, Edward J. Brook, Jeffrey P. 
Severinghaus, Thomas Blunier, Christo Buizert, T.J. Fudge, 
Howard Conway, Ed D. Waddington, Frdric Parrenin, Dorthe 
Dahl-Jensen, Mai Winstrup, Paul Vallelonga, V. Gabriela 
Ciobanu, and Nancy Bertler: An 83,000 year old ice core from 
Roosevelt Island, Ross Sea, Antarctica, Climate of 
the Past.

Notes:
Measurements of CH4 follow methods described in Mitchell et al. 
(2011, 2012) with updates described in the manuscript. SD is 
given as the standard deviation between replicates if a 
replicate sample was measured. Otherwise, SD is based on the 
relative standard deviation of replicates.

References:
-Mitchell, L. E., Brook, E. J., Sowers, T., McConnell, J. R., and Taylor, K.: Multidecadal variability of 
atmospheric methane, 1000-1800 C.E, Journal of Geophysical Research, 116, G02 007, 2011.

-Mitchell, L. E., Buizert, C., Brook, E. J., Breton, D. J., Fegyveresi, J., Baggenstos, D., Orsi, A., 
Severinghaus, J., Alley, R. B., Albert, M., et al.: Observing and modeling the influence of layering on 
bubble trapping in polar firn, Journal of Geophysical Research: Atmospheres, 120, 25582574, 2015.
 
Column 1: Sample Depth (mean depth of typically 10 cm long 
samples)
Column 2: RICE17 gas age, years before 1950
Column 3: CH4 (ppb)
Column 4: SD (ppb)
Column 5: N (#)
 
For questions on the use or construction of this chronology, please contact:
<jlee@coas.oregonstate.edu>     James E. Lee
<Brooke@geo.oregonstate.edu> 	Ed Brook


depth    age    mean  [CH4] SD n                              
60.05    -21  1214.8  12.5 2
  65.05     -2  1117.4  12.0 2
  70.05     17   964.0  11.2 2
  75.05     37   875.8  10.7 2
  80.05     57   825.9  10.4 2
  85.05     78   788.5  10.2 2
  90.05     99   764.3  10.0 2
  95.05    128   739.4   9.9 2
 100.05    157   752.6   9.9 1
 105.04    186   717.5   9.7 1
 105.05    186   712.9   9.7 1
 110.05    216   691.4   9.5 2
 115.05    246   693.0   9.6 2
 120.05    273   698.9   9.6 2
 125.05    297   688.4   9.5 2
 130.05    321   686.7   9.5 2
 135.05    346   690.2   9.5 2
 140.05    370   719.8   9.7 2
 145.05    399   712.1   9.7 2
 150.05    441   703.7   9.6 2
 155.05    483   678.8   9.5 2
 160.05    525   683.3   9.5 2
 165.05    568   682.2   9.5 2
 170.05    608   682.3   9.5 2
 173.05    626   677.9   9.4 2
 176.05    643   687.1   9.5 2
 179.05    661   690.2   9.5 2
 182.05    678   680.0   9.5 2
 185.04    696   676.6   9.4 2
 188.05    714   671.7   9.4 2
 191.05    732   675.4   9.4 2
 194.04    750   689.5   9.5 2
 197.05    771   693.6   9.6 2
 200.05    791   695.7   9.6 2
 203.05    812   686.0   9.5 2
 206.05    832   688.0   9.5 2
 209.05    853   683.2   9.5 2
 212.05    874   678.0   9.4 2
 215.05    895   685.5   9.5 2
 218.05    920   672.4   9.4 2
 221.05    952   664.0   9.4 2
 224.05    984   659.2   9.3 1
 227.05   1015   654.8   9.3 2
 230.05   1047   653.5   9.3 2
 233.05   1080   656.6   9.3 2
 236.05   1112   644.6   9.2 2
 239.05   1144   649.9   9.3 2
 242.05   1168   631.3   9.1 2
 245.05   1191   639.2   9.2 2
 248.05   1215   657.5   9.3 2
 251.05   1239   647.3   9.3 2
 254.05   1269   639.7   9.2 2
 257.05   1302   632.1   9.1 2
 260.05   1335   654.0   9.3 2
 262.05   1357   660.8   9.3 2
 264.05   1379   656.1   9.3 2
 266.05   1405   653.8   9.3 2
 268.05   1432   640.3   9.2 2
 270.05   1460   642.9   9.2 2
 272.05   1487   633.2   9.2 2
 274.05   1514   633.6   9.2 2
 276.05   1542   623.9   9.1 2
 278.05   1567   633.3   9.2 2
 280.05   1591   639.4   9.2 2
 282.05   1615   642.4   9.2 2
 284.05   1640   640.8   9.2 1
 286.05   1665   644.1   9.2 2
 288.05   1690   645.4   9.2 2
 290.05   1713   645.7   9.2 1
 292.05   1737   634.2   9.2 2
 294.05   1761   636.3   9.2 2
 296.05   1784   634.4   9.2 2
 298.05   1808   648.6   9.3 2
 300.05   1832   635.8   9.2 2
 302.05   1861   624.0   9.1 2
 304.05   1890   620.0   9.1 2
 306.05   1919   607.0   9.0 2
 308.05   1949   629.5   9.1 2
 310.05   1978   621.4   9.1 2
 312.05   2007   615.3   9.0 2
 314.05   2035   609.6   9.0 2
 316.05   2063   619.8   9.1 2
 318.05   2092   604.3   8.9 2
 320.05   2120   606.0   9.0 2
 322.05   2149   607.7   9.0 2
 324.05   2182   630.4   9.1 2
 326.05   2217   625.7   9.1 2
 328.05   2251   603.7   8.9 2
 330.05   2286   611.1   9.0 2
 332.05   2321   617.9   9.0 2
 334.05   2352   621.0   9.1 2
 336.05   2378   611.8   9.0 2
 338.05   2404   599.2   8.9 2
 340.05   2431   599.8   8.9 2
 342.05   2457   605.5   9.0 1
 344.05   2486   589.0   8.8 2
 346.05   2524   591.8   8.9 2
 348.05   2562   601.1   8.9 2
 350.05   2600   606.3   9.0 2
 352.05   2639   590.6   8.8 2
 354.05   2678   592.9   8.9 2
 356.05   2725   610.5   9.0 2
 358.05   2773   596.5   8.9 2
 360.65   2836   592.4   8.9 2
 362.65   2884   582.2   8.8 2
 364.05   2917   587.2   8.8 2
 366.05   2945   595.0   8.9 2
 368.05   2974   588.8   8.8 2
 370.05   3002   590.2   8.8 2
 372.05   3031   585.7   8.8 2
 374.05   3063   587.3   8.8 1
 376.05   3109   597.7   8.9 2
 378.05   3155   592.5   8.9 2
 380.05   3201   596.0   8.9 2
 382.05   3247   584.9   8.8 2
 384.05   3284   582.0   8.8 2
 386.05   3309   595.8   8.9 2
 388.05   3335   596.1   8.9 2
 390.05   3360   589.0   8.8 2
 392.05   3385   582.4   8.8 2
 394.05   3422   578.6   8.8 2
 396.05   3461   603.3   8.9 2
 398.05   3501   586.9   8.8 2
 400.05   3541   572.5   8.7 2
 402.05   3581   572.8   8.7 2
 404.05   3620   601.6   8.9 1
 406.05   3659   591.7   8.9 2
 407.05   3679   589.9   8.9 1
 408.05   3698   583.9   8.8 1
 409.05   3718   582.6   8.8 1
 410.05   3738   579.4   8.8 1
 411.05   3755   589.0   8.8 1
 412.05   3771   598.8   8.9 1
 413.05   3786   594.9   8.9 1
 414.05   3802   595.4   8.9 1
 415.05   3818   606.0   9.0 1
 416.42   3839   609.8   9.0 1
 417.05   3849   607.9   9.0 1
 418.05   3865   602.2   8.9 1
 419.05   3881   602.0   8.9 1
 420.05   3895   602.5   8.9 1
 421.05   3910   591.5   8.9 1
 422.05   3925   600.3   8.9 1
 423.05   3940   576.5   8.8 1
 424.05   3954   579.0   8.8 1
 425.05   3969   581.6   8.8 1
 426.05   3984   571.1   8.7 1
 427.05   3999   571.7   8.7 1
 428.05   4017   579.7   8.8 1
 429.05   4036   576.0   8.8 1
 430.05   4056   573.7   8.7 1
 431.05   4075   574.3   8.8 1
 432.05   4095   575.3   8.8 1
 433.05   4114   571.3   8.7 1
 434.05   4134   586.4   8.8 1
 435.05   4154   576.9   8.8 1
 436.05   4176   577.4   8.8 1
 437.05   4202   586.2   8.8 1
 438.31   4234   589.9   8.9 1
 439.05   4253   586.4   8.8 1
 440.15   4282   582.2   8.8 1
 441.05   4305   585.0   8.8 1
 442.15   4334   573.2   8.7 1
 443.05   4358   582.4   8.8 1
 444.15   4382   594.4   8.9 1
 445.24   4400   585.9   8.8 1
 446.17   4416   592.4   8.9 1
 447.11   4431   591.2   8.9 1
 448.11   4448   579.0   8.8 1
 449.05   4464   566.7   8.7 1
 450.26   4485   577.7   8.8 1
 451.05   4498   580.4   8.8 1
 452.05   4518   584.5   8.8 1
 453.05   4541   581.2   8.8 1
 454.05   4563   581.5   8.8 1
 455.05   4585   572.7   8.7 1
 456.08   4608   572.8   8.7 1
 457.05   4630   584.4   8.8 1
 458.05   4652   585.5   8.8 1
 459.05   4675   577.6   8.8 1
 460.60   4714   557.0   8.6 1
 461.05   4725   555.0   8.6 1
 462.23   4755   558.9   8.6 1
 463.05   4775   575.2   8.8 1
 464.05   4801   578.0   8.8 1
 465.05   4826   569.1   8.7 1
 466.23   4856   559.7   8.6 1
 467.05   4872   571.1   8.7 1
 468.05   4887   586.0   8.8 1
 469.13   4903   584.1   8.8 1
 470.19   4920   576.9   8.8 1
 471.05   4933   585.6   8.8 1
 472.20   4951   577.1   8.8 1
 473.09   4965   590.5   8.9 1
 474.05   4980   587.9   8.8 1
 475.05   4996   578.5   8.8 1
 476.05   5012   575.4   8.8 1
 477.05   5028   571.9   8.7 1
 478.38   5050   568.5   8.7 1
 479.05   5061   573.3   8.8 1
 480.05   5077   578.1   8.8 1
 481.05   5094   570.1   8.7 1
 482.13   5115   562.5   8.7 1
 483.05   5132   568.3   8.7 1
 484.05   5151   559.5   8.6 1
 485.05   5169   573.3   8.7 1
 486.05   5188   566.9   8.7 1
 487.05   5207   557.7   8.6 1
 488.05   5229   549.5   8.6 1
 489.05   5254   554.1   8.6 1
 490.05   5279   568.8   8.7 1
 491.05   5305   568.1   8.7 1
 492.34   5338   567.3   8.7 1
 493.43   5366   560.9   8.7 1
 494.05   5382   559.7   8.6 1
 495.05   5402   560.5   8.7 1
 496.05   5418   559.8   8.6 1
 497.05   5434   552.4   8.6 1
 498.05   5450   565.4   8.7 1
 499.06   5466   582.3   8.8 1
 500.06   5483   577.3   8.8 1
 501.05   5499   575.0   8.8 1
 502.05   5519   581.7   8.8 1
 503.22   5542   572.7   8.7 1
 504.05   5559   569.6   8.7 1
 505.05   5580   562.9   8.7 1
 506.05   5600   576.5   8.8 1
 507.20   5624   608.8   9.0 1
 508.05   5651   580.6   8.8 1
 509.05   5687   589.5   8.9 1
 510.05   5723   585.0   8.8 1
 511.09   5760   609.8   9.0 1
 512.05   5795   579.0   8.8 1
 513.05   5832   584.9   8.8 1
 514.05   5865   574.6   8.8 1
 515.05   5893   591.9   8.9 1
 516.05   5921   579.8   8.8 1
 517.05   5949   582.6   8.8 1
 518.05   5977   548.6   8.6 1
 519.05   6006   560.2   8.6 1
 520.05   6034   584.0   8.8 1
 521.34   6070   589.1   8.8 1
 522.05   6091   606.8   9.0 1
 523.18   6123   610.5   9.0 1
 524.48   6160   589.9   8.9 1
 525.15   6179   573.1   8.7 1
 526.05   6205   595.0   8.9 1
 527.05   6235   599.3   8.9 1
 528.57   6280   600.5   8.9 1
 529.34   6303   612.0   9.0 1
 530.05   6325   618.4   9.1 1
 531.22   6360   610.6   9.0 1
 532.15   6380   609.8   9.0 1
 533.05   6395   596.2   8.9 1
 534.05   6412   588.3   8.8 1
 535.06   6430   602.4   8.9 1
 536.05   6447   601.6   8.9 1
 537.27   6469   579.5   8.8 1
 538.05   6491   591.3   8.9 1
 539.35   6528   604.3   9.0 1
 540.05   6547   603.1   8.9 1
 541.18   6580   612.1   9.0 1
 542.05   6605   611.9   9.0 1
 543.23   6639   589.8   8.9 1
 544.05   6663   594.5   8.9 1
 545.05   6693   593.2   8.9 1
 546.05   6723   614.2   9.0 1
 547.13   6755   595.1   8.9 1
 548.05   6783   605.5   9.0 1
 549.29   6819   599.6   8.9 1
 550.05   6841   618.8   9.1 1
 551.05   6871   612.5   9.0 1
 552.05   6900   625.4   9.1 1
 553.05   6930   616.3   9.0 1
 554.05   6951   612.0   9.0 1
 555.05   6970   620.4   9.1 1
 556.77   7002   635.6   9.2 1
 557.05   7007   631.9   9.2 1
 558.05   7026   622.9   9.1 1
 559.05   7044   634.1   9.2 1
 560.05   7060   633.2   9.2 1
 561.05   7077   624.7   9.1 1
 562.05   7094   612.8   9.0 2
 563.05   7111   618.5   9.1 1
 564.05   7130   631.2   9.2 1
 565.05   7151   623.4   9.1 1
 566.05   7172   607.1   9.0 1
 567.05   7193   619.9   9.1 1
 568.05   7214   613.8   9.0 1
 569.05   7247   631.8   9.2 1
 570.05   7284   628.6   9.1 1
 570.55   7303   627.8   9.1 1
 571.05   7322   622.9   9.1 1
 571.55   7341   615.6   9.0 1
 572.05   7360   634.9   9.2 1
 572.55   7379   642.1   9.2 1
 573.05   7398   636.0   9.2 1
 573.55   7412   622.7   9.1 1
 574.05   7426   614.5   9.0 1
 574.55   7440   620.6   9.1 1
 575.05   7453   624.4   9.1 1
 575.55   7467   623.3   9.1 1
 576.05   7481   617.5   9.1 1
 576.55   7495   615.8   9.0 1
 577.05   7509   617.7   9.1 1
 577.55   7523   623.4   9.1 1
 578.05   7541   621.8   9.1 1
 578.55   7561   624.7   9.1 1
 579.04   7582   620.5   9.1 1
 579.55   7603   615.5   9.0 1
 580.05   7624   612.4   9.0 1
 580.55   7645   615.3   9.0 1
 581.05   7666   621.6   9.1 1
 581.55   7687   619.9   9.1 1
 582.05   7708   620.7   9.1 1
 582.55   7732   623.7   9.1 1
 583.05   7758   631.6   9.2 1
 583.55   7784   630.1   9.1 1
 584.05   7811   630.4   9.2 1
 584.55   7837   630.1   9.2 1
 585.39   7882   634.8   9.2 1
 586.15   7922   633.7   9.2 1
 587.05   7967   631.4   9.2 1
 588.05   8010   632.5   9.2 1
 589.05   8054   613.0   9.0 1
 590.05   8099   583.0   8.8 1
 591.42   8152   566.9   8.7 1
 592.05   8169   613.1   9.0 1
 593.05   8197   630.2   9.1 1
 594.05   8224   641.1   9.2 1
 595.05   8252   630.3   9.1 1
 596.05   8282   638.4   9.2 1
 597.12   8320   642.1   9.2 1
 598.05   8352   637.5   9.2 1
 599.05   8388   636.8   9.2 1
 600.05   8423   651.0   9.3 1
 601.05   8449   651.3   9.3 1
 602.05   8473   651.0   9.3 1
 603.39   8506   664.4   9.4 1
 604.05   8523   647.4   9.3 1
 605.05   8550   676.3   9.4 1
 606.05   8581   644.9   9.2 1
 607.05   8612   664.2   9.4 1
 608.46   8657   677.1   9.5 1
 609.07   8675   672.6   9.4 1
 610.05   8697   658.6   9.3 1
 611.05   8719   653.1   9.3 1
 612.05   8742   664.7   9.4 1
 613.05   8764   661.0   9.3 1
 614.05   8785   684.6   9.5 1
 615.14   8808   673.5   9.4 1
 616.05   8828   672.4   9.4 1
 617.05   8849   671.5   9.4 1
 618.13   8890   667.4   9.4 1
 619.23   8934   656.1   9.3 1
 620.14   8971   657.8   9.3 1
 621.28   9018   673.5   9.4 1
 622.15   9061   663.6   9.4 1
 623.05   9106   675.8   9.4 1
 624.16   9161   674.3   9.4 1
 625.52   9248   668.7   9.4 1
 626.14   9301   687.8   9.5 1
 627.05   9379   676.0   9.4 1
 628.55   9509   690.2   9.6 1
 629.05   9546   685.9   9.5 1
 630.05   9612   697.7   9.6 1
 631.05   9678   693.2   9.6 1
 632.05   9744   688.6   9.5 1
 633.52   9806   685.2   9.5 1
 634.06   9826   694.2   9.6 1
 635.16   9865   697.6   9.6 1
 636.44   9904   695.7   9.6 1
 637.36   9924   703.5   9.6 1
 638.30   9945   702.5   9.6 1
 639.42   9971   705.7   9.7 1
 640.39  10006   690.3   9.6 1
 641.05  10031   684.0   9.5 1
 642.15  10071   691.2   9.6 1
 643.05  10113   674.3   9.4 1
 644.05  10177   711.8   9.7 1
 645.05  10242   718.8   9.7 1
 646.35  10322   706.3   9.7 1
 647.05  10359   707.9   9.7 1
 648.16  10418   714.2   9.7 1
 649.15  10471   698.4   9.6 1
 650.12  10502   715.6   9.7 1
 651.05  10532   693.4   9.6 1
 652.39  10577   709.9   9.7 1
 653.12  10616   702.9   9.6 1
 654.05  10666   690.7   9.6 1
 655.05  10720   681.4   9.5 1
 656.15  10766   685.1   9.5 1
 657.05  10802   679.4   9.5 1
 658.15  10845   687.4   9.5 1
 659.19  10903   683.8   9.5 1
 660.25  10964   693.0   9.6 1
 661.05  11011   688.6   9.5 1
 662.05  11074   693.1   9.6 1
 663.11  11141   721.2   9.8 1
 664.05  11201   695.6   9.6 1
 665.05  11267   637.5   9.2 1
 666.05  11334   692.0   9.6 1
 667.45  11445   752.4   9.9 1
 668.16  11506   702.8   9.6 1
 669.18  11595   527.8   8.4 1
 669.75  11656   479.1   8.0 1
 670.05  11693   487.3   8.1 1
 670.55  11764   475.7   8.0 1
 671.05  11835   493.4   8.2 1
 671.76  11936   483.6   8.1 1
 672.05  11978   481.7   8.1 1
 672.75  12079   482.8   8.1 1
 673.30  12159   476.9   8.0 1
 673.61  12204   461.2   7.9 1
 674.05  12269   493.3   8.2 1
 674.65  12357   470.1   8.0 1
 675.05  12417   467.4   8.0 1
 675.65  12506   478.1   8.0 1
 676.05  12566   468.2   8.0 1
 676.74  12671   468.1   8.0 1
 677.25  12748   538.2   8.5 1
 677.55  12832   620.4   9.1 1
 678.18  13026   648.5   9.3 1
 678.72  13192   663.7   9.4 1
 679.23  13351   679.5   9.5 1
 679.68  13500   633.4   9.2 1
 680.14  13684   679.2   9.5 1
 680.55  13849   662.6   9.4 1
 681.05  14051   625.5   9.1 1
 681.55  14255   636.8   9.2 1
 682.05  14412   625.0   9.1 1
 682.52  14518   597.7   8.9 1
 683.13  14657   482.2   8.1 1
 683.55  14752   480.8   8.1 1
 684.05  14865   477.9   8.0 1
 684.66  14989   467.8   8.0 1
 685.05  15069   459.7   7.9 1
 685.58  15179   458.4   7.9 1
 686.05  15277   469.5   8.0 1
 686.58  15420   471.1   8.0 1
 687.05  15549   453.5   7.8 1
 687.45  15660   450.4   7.8 1
 688.05  15826   458.1   7.9 1
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