GRIP N2O and CH4 Data for Dansgaard-Oeschger Events 19 and 20 ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: GRIP N2O and CH4 Data for Dansgaard-Oeschger Events 19 and 20 LAST UPDATE: 02/2004 (Original Receipt by WDC Paleo) CONTRIBUTORS: Jacqueline Flückiger, Renato Spahni, Thomas Blunier, Bernhard Stauffer, Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2004-005 SUGGESTED DATA CITATION: Flückiger, J., et al., 2004, GRIP N2O and CH4 Data for Dansgaard-Oeschger Events 19 and 20, IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2004-005. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Flückiger, J., T. Blunier, B. Stauffer, J. Chappellaz, R. Spahni, K. Kawamura, J. Schwander, T.F. Stocker, and D. Dahl-Jensen. 2004. N2O and CH4 variations during the last glacial epoch: Insight into global processes, Glob. Biogeochem. Cycles, Vol. 18, GB1020, doi:10-1029/2003GB002122. ABSTRACT: Greenhouse gas measurements along polar ice cores provide important insight into the former composition of the atmosphere, its natural variations, and the responses to fast climatic changes in the past. We present high-resolution nitrous oxide (N2O) and methane (CH4) records measured along two ice cores from central Greenland covering part of Marine Isotope Stages 3 and 4 in the last glacial epoch. The N2O data confirm the hypothesis that N2O shows variations in phase to fast climatic changes observed in the Northern Hemisphere, the so-called Dansgaard-Oeschger (D-O) events. Variations exist not only for events with a long duration (1500 years and more) but also for the shorter ones. The comparison with CH4 unveils interesting differences between the response of CH4 and N2O to D-O events. While the average amplitudes of CH4 oscillations associated with D-O events are similar to those of the Northern Hemisphere summer insolation, the magnitude of the N2O concentration change instead correlates with the duration of the D-O events. The records give further insight into the timing of concentration changes at the beginning of D-O events. They show that for long-lasting events the N2O concentration starts to increase before both the sharp increase in the CH4 concentration and the temperature reconstructed for Greenland. GEOGRAPHIC REGION: Greenland PERIOD OF RECORD: 66 - 76 kyr BP DESCRIPTION: N2O and CH4 records from the GRIP ice core (Greenland) covering Dansgaard-Oeschger Events 19 and 20. (Please also see file ngrip_n2o-ch4_2004.txt for N2O and CH4 records from the NGRIP ice core). Measurements were performed along the Greenland Ice Core Project (GRIP) ice core (72°34'N, 37°37'W). Ninety-six and 107 samples from different depth levels were measured for N2O and CH4, respectively, covering the time period of D-O events 19 and 20. The GRIP record achieves a mean time resolution of 97 years and 77 years for N2O and CH4, respectively, reaching a resolution of about 30 years at the beginning of D-O event 19. FUNDING SOURCES: This work, as part of the NorthGRIP project, was supported by the University of Bern and the Swiss National Science Foundation. The NorthGRIP project is directed and organized by the Department of Geophysics at the Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen. It is being supported by Funding Agencies in Denmark (SNF), Belgium (FNRS-CFB), France (IFRTP and INSU/CNRS), Germany (AWI), Iceland (RannIs), Japan (MEXT), Sweden (SPRS), Switzerland (SNF), and the United States of America (NSF). Partial support through contract EVK2-2000-22067 (POP) by the Swiss Federal Office of Science and Education is acknowledged. DATA: Column 1: depth [m] Column 2: age (GRIP SS09) [yr BP] Column 3: N2O concentration [ppbv] Column 4: N2O artifacts [ppbv] Column 5: 1-sigma uncertainty N2O [ppbv] Column 6: CH4 concentration [ppbv] Column 7: 1-simgma uncertainty CH4 [ppbv] depth gas age N2O N2O artif. N2O err. CH4 CH4 err. [m] [yr BP] [ppbv] [ppbv] [ppbv] [ppbv] [ppbv] 2536.05 66241 NaN NaN NaN 441 10 2540.47 66962 216 NaN 3.7 524.3 10 2540.74 66997 215.3 NaN 3.5 NaN NaN 2540.98 67029 NaN 234 3.4 501.3 10 2542.12 67321 222.3 NaN 3.8 473.7 10 2542.59 67474 215 NaN 3.7 477.7 10 2542.63 67487 204.3 NaN 3.5 473.3 10 2542.83 67546 221 NaN 3.7 465.7 10 2543.18 67648 218.3 NaN 3.5 464.7 10 2543.825 67788 216.3 NaN 3.8 464.7 10 2544.28 67872 220.3 NaN 3.8 468 10 2544.87 67977 220.7 NaN 3.8 466 10 2545.36 68057 230.3 NaN 3.5 458.7 10 2545.97 68150 241.7 NaN 3.5 494 10 2547.05 68294 NaN NaN NaN 467 10 2547.105 68300 250 NaN 3.7 486 10 2547.55 68350 246.7 NaN 3.5 482 10 2548.17 68423 257 NaN 3.4 507 10 2548.54 68465 246.3 NaN 3.5 481 10 2548.68 68480 NaN NaN NaN 499 10 2549.27 68548 258.3 NaN 3.5 509.7 10 2549.78 68612 249 NaN 3.7 502.7 10 2550.37 68674 NaN NaN NaN 494.7 10 2550.88 68734 249.3 NaN 3.5 518.3 10 2551.47 68799 258 NaN 3.7 479 10 2552.57 68918 253 NaN 3.4 489 10 2553.67 69024 258 NaN 3.7 476.3 10 2553.71 69028 NaN NaN NaN 500 10 2554.135 69073 249.7 NaN 4 516.3 10 2554.77 69140 264.3 NaN 3.5 494.7 10 2555.23 69185 249.7 NaN 3.5 499.3 10 2555.91 69247 255.7 NaN 3.5 502 10 2555.95 69251 NaN NaN NaN 498 10 2556.97 69341 259.7 NaN 3.8 476.7 10 2557.6 69388 255.7 NaN 3.5 467.7 10 2558.05 69415 NaN NaN NaN 494 10 2558.62 69454 265.7 NaN 4 511.7 10 2559.22 69491 263.7 NaN 3.8 497.7 10 2559.76 69521 NaN 322.3 4.4 514 10 2560.39 69555 259.7 NaN 3.5 532.3 10 2560.86 69581 261.3 NaN 3.5 537.3 10 2561.41 69614 254.7 NaN 3.5 554.3 10 2561.84 69641 244 NaN 3.7 536.7 10 2562 69653 244.7 NaN 3.5 528.3 10 2562.39 69687 242.7 NaN 3.5 499.7 10 2562.51 69701 245.3 NaN 3.5 470.7 10 2562.87 69750 238 NaN 3.7 450.7 10 2563.02 69773 231 NaN 3.7 451.3 10 2563.08 69788 228.7 NaN 3.5 440.3 10 2563.445 69880 233 NaN 3.4 448.7 10 2563.61 69924 232.7 NaN 4 442.3 10 2564.04 70050 225 NaN 4.3 432 10 2564.16 70087 223.7 NaN 3.5 442 10 2564.47 70191 NaN 246.3 3.5 446.3 10 2564.75 70285 NaN 430.3 4 437.3 10 2565.18 70432 NaN 236.7 3.8 438.3 10 2565.27 70466 215.3 NaN 3.5 440 10 2565.31 70480 222.3 NaN 3.8 438.7 10 2565.73 70645 NaN 232.3 3.5 445 10 2565.89 70704 218.3 NaN 3.5 442.7 10 2566.36 70880 218.7 NaN 3.5 453.3 10 2566.83 71082 220.7 NaN 3.8 457.3 10 2566.91 71117 NaN NaN NaN 458.7 10 2567.19 71241 232 NaN 3.4 467.5 10 2567.42 71342 226.7 NaN 3.5 474.7 10 2567.77 71476 226.3 NaN 3.5 480 10 2567.97 71550 230.3 NaN 3.5 487.7 10 2568.52 71663 232.7 NaN 3.8 499 10 2568.68 71688 232.7 NaN 3.5 499.7 10 2569.05 71745 NaN NaN NaN 444 10 2569.11 71754 240 NaN 3.7 451 10 2570.17 71903 240.3 NaN 3.5 460.3 10 2571.295 72069 256.3 NaN 3.8 475 10 2572.37 72217 NaN NaN NaN 486.3 10 2572.41 72222 261 NaN 3.7 481.3 10 2573.47 72359 263 NaN 3.4 494 10 2574.02 72429 NaN NaN NaN 475.3 10 2574.53 72492 256.7 NaN 3.5 484.3 10 2575.67 72630 264.3 NaN 3.5 483.7 10 2576.77 72769 259.3 NaN 3.5 480 10 2577.87 72901 265 NaN 3.4 488.7 10 2578.97 73031 271 NaN 3.7 513.7 10 2580.07 73149 260.3 NaN 3.5 476 10 2580.66 73216 NaN NaN NaN 490.3 10 2580.7 73221 255.7 NaN 3.5 492.3 10 2581.17 73272 262 NaN 3.4 495.7 10 2582.33 73400 255.3 NaN 3.8 497.7 10 2583.37 73512 268 NaN 3.7 514 10 2584.47 73629 271 NaN 3.7 519.7 10 2585.57 73717 261.7 NaN 3.8 522 10 2586.67 73811 257.3 NaN 3.8 531.3 10 2587.77 73889 260 NaN 3.7 530.3 10 2588.28 73928 NaN 271.7 3.4 543 10 2588.87 73981 247.7 NaN 3.5 554.3 10 2589.095 74014 243 NaN 3.7 512.3 10 2589.38 74056 241.7 NaN 3.5 450.7 10 2590 74195 NaN 336.3 4 440.7 10 2590.48 74320 NaN 250.7 3.5 441.3 10 2591.11 74503 225 NaN 3.7 431.7 10 2591.385 74600 219.7 NaN 3.8 431 10 2591.62 74682 226 NaN 3.4 437.3 10 2591.935 74791 227.7 NaN 3.5 431 10 2592.17 74872 206.7 NaN 3.5 425.7 10 2592.52 74999 240.7 NaN 3.5 440 10 2592.68 75057 245 NaN 3.7 441.7 10 2593.27 75264 244.3 NaN 3.5 426 10 2593.78 75391 245 NaN 3.7 448.5 10 2594.37 75511 239.3 NaN 3.8 440 10