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McConnell, Chelsea A.
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Buizert, Christo
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- Creator:
- Rhodes, Rachael H., Faïn, Xavier, Brook, Edward J., McConnell, Joseph R., Maselli, Olivia J., Sigl, Michael, Edwards, Jon, Buizert, Christo, Blunier, Thomas, Chappellaz, Jérôme, and Freitag, Johannes
- Abstract:
- Advances in trace gas analysis allow localised, non-atmospheric features to be resolved in ice cores, superimposed on the coherent atmospheric signal. These high-frequency signals could not have survived the low-pass filter effect that gas diffusion in the firn exerts on the atmospheric history and therefore do not result from changes...
- Resource Type:
- Article
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- Creator:
- Rhodes, Rachael H., Faïn, Xavier, Brook, Edward J., McConnell, Joseph R., Maselli, Olivia J., Sigl, Michael, Edwards, Jon, Buizert, Christo, Blunier, Thomas, Chappellaz, Jérôme, and Freitag, Johannes
- Abstract:
- Advances in trace gas analysis allow localised, non-atmospheric features to be resolved in ice cores, superimposed on the coherent atmospheric signal. These high-frequency signals could not have survived the low-pass filter effect that gas diffusion in the firn exerts on the atmospheric history and therefore do not result from changes...
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- Creator:
- Rhodes, Rachael H., Faïn, Xavier, Brook, Edward J., McConnell, Joseph R., Maselli, Olivia J., Sigl, Michael, Edwards, Jon, Buizert, Christo, Blunier, Thomas, Chappellaz, Jérôme, and Freitag, Johannes
- Abstract:
- Advances in trace gas analysis allow localised, non-atmospheric features to be resolved in ice cores, superimposed on the coherent atmospheric signal. These high-frequency signals could not have survived the low-pass filter effect that gas diffusion in the firn exerts on the atmospheric history and therefore do not result from changes...
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- Creator:
- Mitchell, Logan E., Buizert, Christo, Brook, Edward J., Breton, Daniel J., Fegyveresi, John, Baggenstos, Daniel, Orsi, Anais, Severinghaus, Jeffrey, Alley, Richard B., Albert, Mary, Rhodes, Rachael H., McConnell, Joseph R., Sigl, Michael, Maselli, Olivia, Gregory, Stephanie, and Ahn, Jinho
- Abstract:
- Interpretation of ice core trace gas records depends on an accurate understanding of the processes that smooth the atmospheric signal in the firn. Much work has been done to understand the processes affecting air transport in the open pores of the firn, but a paucity of data from air trapped...
- Resource Type:
- Article
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- Creator:
- Sigl, Michael, Fudge, Tyler J., Winstrup, Mai, Cole-Dai, Jihong, Ferris, David, McConnell, Joseph R., Taylor, Ken C., Welten, Kees C., Woodruff, Thomas E., Adolphi, Florian, Bisiaux, Marion, Brook, Edward J., Buizert, Christo, Caffee, Marc W., Dunbar, Nelia W., Edwards, Ross, Geng, Lei, Iverson, Nels, Koffman, Bess, Layman, Lawrence, Maselli, Olivia J., McGwire, Kenneth, Muscheler, Raimund, Nishiizumi, Kunihiko, Pasteris, Daniel R., Rhodes, Rachael H., and Sowers, Todd A
- Abstract:
- We present the WD2014 chronology for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes...
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- . Fudge3, Mai Winstrup3,a, Jihong Cole-Dai4, David Ferris5, Joseph R. McConnell1, Ken C. Taylor1, Kees C
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- Creator:
- Sigl, Michael, Fudge, Tyler J., Winstrup, Mai, Cole-Dai, Jihong, Ferris, David, McConnell, Joseph R., Taylor, Ken C., Welten, Kees C., Woodruff, Thomas E., Adolphi, Florian, Bisiaux, Marion, Brook, Edward J., Buizert, Christo, Caffee, Marc W., Dunbar, Nelia W., Edwards, Ross, Geng, Lei, Iverson, Nels, Koffman, Bess, Layman, Lawrence, Maselli, Olivia J., McGwire, Kenneth, Muscheler, Raimund, Nishiizumi, Kunihiko, Pasteris, Daniel R., Rhodes, Rachael H., and Sowers, Todd A
- Abstract:
- We present the WD2014 chronology for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes...
- Full Text:
- , T. A., Clow, G. D., Cheng, H., Edwards, R. L., Sigl, M., McConnell, J. R., and Taylor, K. C.: The
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- Creator:
- Sigl, Michael, Fudge, Tyler J., Winstrup, Mai, Cole-Dai, Jihong, Ferris, David, McConnell, Joseph R., Taylor, Ken C., Welten, Kees C., Woodruff, Thomas E., Adolphi, Florian, Bisiaux, Marion, Brook, Edward J., Buizert, Christo, Caffee, Marc W., Dunbar, Nelia W., Edwards, Ross, Geng, Lei, Iverson, Nels, Koffman, Bess, Layman, Lawrence, Maselli, Olivia J., McGwire, Kenneth, Muscheler, Raimund, Nishiizumi, Kunihiko, Pasteris, Daniel R., Rhodes, Rachael H., and Sowers, Todd A
- Abstract:
- We present the WD2014 chronology for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes...
- Resource Type:
- Article
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- Creator:
- Buizert, Christo, Adrian, Betty, Ahn, Jinho, Albert, Mary, Alley, Richard B., Baggenstos, Daniel, Bauska, Thomas K., Bay, Ryan C., Bencivengo, Brian B., Bentley, Charles R., Brook, Edward J., Chellman, Nathan J., Clow, Gary D., Cole-Dai, Jihong, Conway, Howard, Cravens, Eric, Cuffey, Kurt M., Dunbar, Nelia W., Edwards, Jon S., Fegyveresi, John M., Ferris, Dave G., Fitzpatrick, Joan J., Fudge, T. J., Gibson, Chris J., Gkinis, Vasileios, Goetz, Joshua J., Gregory, Stephanie, Hargreaves, Geoffrey M., Iverson, Nels, Johnson, Jay A., Jones, Tyler R., Kalk, Michael L., Kippenhan, Matthew J., Koffman, Bess G., Kreutz, Karl, Kuhl, Tanner W., Lebar, Donald A., Lee, James E., Marcott, Shaun A., Markle, Bradley R., Maselli, Olivia J., McConnell, Joseph R., McGwire, Kenneth C., Mitchell, Logan E., Mortensen, Nicolai B., Neff, Peter D., Nishiizumi, Kunihiko, Nunn, Richard M., Orsi, Anais J., Pasteris, Daniel R., Pedro, Joel B., Pettit, Erin C., Price, P. Buford, Priscu, John C., Rhodes, Rachael H., Rosen, Julia L., Schauer, Andrew J., Schoenemann, Spruce W., Sendelbach, Paul J., Severinghaus, Jeffrey P., Shturmakov, Alexander J., Sigl, Michael, Slawny, Kristina R., Souney, Joseph M., Sowers, Todd A., Spencer, Matthew K., Steig, Eric J., Taylor, Kendrick C., Twickler, Mark S., Vaughn, Bruce H., Voigt, Donald E., Waddington, Edwin D., Welten, Kees C., Wendricks, Anthony W., White, James W. C., Winstrup, Mai, Wong, Gifford J., and Woodruff, Thomas E.
- Abstract:
- The last glacial period exhibited abrupt Dansgaard–Oeschger climatic oscillations, evidence of which is preserved in a variety of Northern Hemisphere palaeoclimate archives¹. Ice cores show that Antarctica cooled during the warm phases of the Greenland Dansgaard–Oeschger cycle and vice versa[superscript 2,3], suggesting an interhemispheric redistribution of heat through a mechanism...
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- Article
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- oscillations, evidence of which is preserved in a variety of Northern Hemisphere palaeoclimate archives1. Ice
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- Creator:
- Rasmussen, S. O., Abbott, P. M., Blunier, T., Bourne, A. J., Brook, Edward J., Buchardt, S. L., Buizert, Christo, Chappellaz, J., Clausen, H. B., Cook, E., Dahl-Jensen, D., Davies, S. M., Guillevic, M., Kipfstuhl, S., Laepple, T., Seierstad, I. K., Severinghaus, J. P., Steffensen, J. P., Stowasser, C., Svensson, A., Vallelonga, P., Vinther, B. M., Wilhelms, F., and Winstrup, M.
- Abstract:
- A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified...
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- Article
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- A first chronology for the North Greenland Eemian
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- Creator:
- Mitchell, Logan E., Buizert, Christo, Brook, Edward J., Rhodes, Rachael H., and et al.
- Abstract:
- Interpretation of ice core trace gas records depends on an accurate understanding of the processes that smooth the atmospheric signal in the firn. Much work has been done to understand the processes affecting air transport in the open pores of the firn, but a paucity of data from air trapped...
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- with each other (r = -0.78, p < 0.01, after de-trending with a spline fit) and there are two
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- Creator:
- Mitchell, Logan E., Buizert, Christo, Brook, Edward J., Rhodes, Rachael H., and et al.
- Abstract:
- Interpretation of ice core trace gas records depends on an accurate understanding of the processes that smooth the atmospheric signal in the firn. Much work has been done to understand the processes affecting air transport in the open pores of the firn, but a paucity of data from air trapped...
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- other compounds [McConnell, 2002], and a laser-based atmospheric analyzer for measuring black carbon (BC
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- Creator:
- Mitchell, Logan, Brook, Edward J., Lee, James E., Buizert, Christo, and Sowers, Todd
- Abstract:
- The origin of the late pre-industrial Holocene (LPIH) increase in atmospheric methane concentrations has been much debated. Hypotheses invoking changes in solely anthropogenic sources or solely natural sources have been proposed to explain the increase in concentrations. Here two high-resolution, high-precision ice core methane concentration records from Greenland and Antarctica...
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- are used to construct a high-resolution record of the methane inter-polar difference (IPD). The IPD
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- Creator:
- Buizert, Christo, Baggenstos, Daniel, Jiang, Wei, Purtschert, Roland, Petrenko, Vasilii V., Lu, Zheng-Tian, Mueller, Peter, Lee, James, Severinghaus, Jeffrey P., and Brook, Edward J.
- Abstract:
- We present the first successful ⁸¹Kr-Kr radiometric dating of ancient polar ice. Krypton was extracted from the air bubbles in four ~350 kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The ⁸¹Kr radiometric ages agree with independent...
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- stratigraphic dating techniques with a mean absolute age offset of 6 ± 2.5 ka. Our experimental methods and
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- Creator:
- Ahn, Jinho, Brook, Edward J., and Buizert, Christo
- Abstract:
- Atmospheric CO₂ records for the centennial scale cooling event 8200 years ago (8.2 ka event) may help us understand climate-carbon cycle feedbacks under interglacial conditions, which are important for understanding future climate, but existing records do not provide enough detail. Here we present a new CO₂ record from the Siple...
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- . Here we present a new CO2 record from the Siple Dome ice core, Antarctica, that covers 7.4–9.0 kawith 8
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- Creator:
- Buizert, Christo, Sowers, Todd, and Blunier, Thomas
- Abstract:
- During rapid variations of the atmospheric mixing ratio of a trace gas, diffusive transport in the porous firn layer atop ice sheets and glaciers alters the isotopic composition of that gas relative to the overlying atmosphere. Records of past atmospheric trace gas isotopic composition from ice cores and firn need...
- Resource Type:
- Article
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- of the atmospheric mixing ratio of a trace gas, dif- fusive transport in the porous firn layer atop
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- Creator:
- Mitchell, Logan, Brook, Edward J., Lee, James E., Buizert, Christo, and Sowers, Todd
- Abstract:
- The origin of the late pre-industrial Holocene (LPIH) increase in atmospheric methane concentrations has been much debated. Hypotheses invoking changes in solely anthropogenic sources or solely natural sources have been proposed to explain the increase in concentrations. Here two high-resolution, high-precision ice core methane concentration records from Greenland and Antarctica...
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- .) Analytical Methods 1.1) Sample measurement Air was extracted from ice core samples using a wet extraction