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C. Buizert; J. P. Severinghaus (2016)
Publisher: Copernicus Publications
Journal: The Cryosphere
Languages: English
Types: Article
Subjects: GE1-350, QE1-996.5, Environmental sciences, Geology
Commonly, three mechanisms of firn air transport are distinguished: molecular diffusion, advection, and near-surface convective mixing. Here we identify and describe a fourth mechanism, namely dispersion driven by synoptic-scale surface pressure variability (or barometric pumping). We use published gas chromatography experiments on firn samples to derive the along-flow dispersivity of firn, and combine this dispersivity with a dynamical air pressure propagation model forced by surface air pressure time series to estimate the magnitude of dispersive mixing in the firn. We show that dispersion dominates mixing within the firn lock-in zone. Trace gas concentrations measured in firn air samples from various polar sites confirm that dispersive mixing occurs. Including dispersive mixing in a firn air transport model suggests that our theoretical estimates have the correct order of magnitude, yet may overestimate the true dispersion. We further show that strong barometric pumping, such as at the Law Dome site, may reduce the gravitational enrichment of δ15N–N2 and other tracers below gravitational equilibrium, questioning the traditional definition of the lock-in depth as the depth where δ15N enrichment ceases. Last, we propose that 86Kr excess may act as a proxy for past synoptic activity (or paleo-storminess) at the site.
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    • Adolph, A. C. and Albert, M. R.: Gas diffusivity and permeability through the firn column at Summit, Greenland: measurements and comparison to microstructural properties, The Cryosphere, 8, 319-328, doi:10.5194/tc-8-319-2014, 2014.
    • Barnes, P. R. F., Wolff, E. W., and Mulvaney, R.: A 44 kyr paleoroughness record of the Antarctic surface, J. Geophys. Res.- Atmos., 111, D03102, doi:10.1029/2005JD006349, 2006.
    • Battle, M., Bender, M., Sowers, T., Tans, P. P., Butler, J. H., Elkins, J. W., Ellis, J. T., Conway, T., Zhang, N., Lang, P., and Clarket, A. D.: Atmospheric gas concentrations over the past century measured in air from firn at the South Pole, Nature, 383, 231- 235, 1996.
    • Battle, M. O., Severinghaus, J. P., Sofen, E. D., Plotkin, D., Orsi, A. J., Aydin, M., Montzka, S. A., Sowers, T., and Tans, P. P.: Controls on the movement and composition of firn air at the West Antarctic Ice Sheet Divide, Atmos. Chem. Phys., 11, 11007- 11021, doi:10.5194/acp-11-11007-2011, 2011.
    • Bay, R., Rohde, R., Price, P., and Bramall, N.: South Pole paleowind from automated synthesis of ice core records, J. Geophys. Res.- Atmos., 115, D14126, doi:10.1029/2009JD013741, 2010.
    • Bendel, V., Ueltzhöffer, K. J., Freitag, J., Kipfstuhl, S., Kuhs, W. F., Garbe, C. S., and Faria, S. H.: High-resolution variations in size, number and arrangement of air bubbles in the EPICA DML (Antarctica) ice core, J. Glaciol., 59, 972-980, doi:10.3189/2013JoG12J245, 2013.
    • Bender, M. L.: Orbital tuning chronology for the Vostok climate record supported by trapped gas composition, Earth Planet. Sc. Lett., 204, 275-289, doi:10.1016/S0012-821X(02)00980-9, 2002.
    • Buizert, C.: ICE CORE METHODS/Studies of Firn Air, in: Encyclopedia of Quaternary Science (2nd Edn.), edited by: Elias, S. A. and Mock, C. J., 361-372, Elsevier, Amsterdam, doi:10.1016/B978-0-444-53643-3.00330-7, 2013.
    • Buizert, C., Martinerie, P., Petrenko, V. V., Severinghaus, J. P., Trudinger, C. M., Witrant, E., Rosen, J. L., Orsi, A. J., Rubino, M., Etheridge, D. M., Steele, L. P., Hogan, C., Laube, J. C., Sturges, W. T., Levchenko, V. A., Smith, A. M., Levin, I., Conway, T. J., Dlugokencky, E. J., Lang, P. M., Kawamura, K., Jenk, T. M., White, J. W. C., Sowers, T., Schwander, J., and Blunier, T.: Gas transport in firn: multiple-tracer characterisation and model intercomparison for NEEM, Northern Greenland, Atmos. Chem. Phys., 12, 4259-4277, doi:10.5194/acp-12-4259-2012, 2012.
    • Buizert, C., Sowers, T., and Blunier, T.: Assessment of diffusive isotopic fractionation in polar firn, and application to ice core trace gas records, Earth Planet. Sc. Lett., 361, 110-119, doi:10.1016/j.epsl.2012.11.039, 2013.
    • Buizert, C., Cuffey, K. M., Severinghaus, J. P., Baggenstos, D., Fudge, T. J., Steig, E. J., Markle, B. R., Winstrup, M., Rhodes, R. H., Brook, E. J., Sowers, T. A., Clow, G. D., Cheng, H., Edwards, R. L., Sigl, M., McConnell, J. R., and Taylor, K. C.: The WAIS Divide deep ice core WD2014 chronology - Part 1: Methane synchronization (68-31 ka BP) and the gas age-ice age difference, Clim. Past, 11, 153-173, doi:10.5194/cp-11-153-2015, 2015.
    • Capron, E., Landais, A., Buiron, D., Cauquoin, A., Chappellaz, J., Debret, M., Jouzel, J., Leuenberger, M., Martinerie, P., MassonDelmotte, V., Mulvaney, R., Parrenin, F., and Prié, F.: Glacialinterglacial dynamics of Antarctic firn columns: comparison between simulations and ice core air- 15N measurements, Clim. Past, 9, 983-999, doi:10.5194/cp-9-983-2013, 2013.
    • Ceppi, P., Hwang, Y.-T., Liu, X., Frierson, D. M. W., and Hartmann, D. L.: The relationship between the ITCZ and the Southern Hemispheric eddy-driven jet, J. Geophys. Res.-Atmos., 118, 5136-5146, doi:10.1002/jgrd.50461, 2013.
    • Colbeck, S. C.: Air Movement in Snow Due to Windpumping, J. Glaciol., 35, 209-213, 1989.
    • Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P., Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P., Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N., Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy, S. B., Hersbach, H., Hólm, E. V., Isaksen, L., Kållberg, P., Köhler, M., Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J., Park, B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and Vitart, F.: The ERA-Interim reanalysis: configuration and performance of the data assimilation system, Q. J. Roy. Meteor. Soc., 137, 553-597, doi:10.1002/qj.828, 2011.
    • Ding, Q., Steig, E. J., Battisti, D. S., and Wallace, J. M.: Influence of the tropics on the Southern Annular Mode, J. Climate, 25, 6330- 6348, doi:10.1175/JCLI-D-11-00523.1, 2012.
    • Drake, S. A., Huwald, H., Parlange, M. B., Selker, J. S., Nolin, A. W., and Higgins, C. W.: Attenuation of windinduced pressure perturbations in alpine snow, J. Glaciol., doi:10.1017/jog.2016.53, online first, 2016.
    • Etheridge, D. M., Pearman, G. I., and Fraser, P. J.: Changes in tropospheric methane between 1841 and 1978 from a high accumulation-rate Antarctic ice core, Tellus B, 44, 282-294, doi:10.1034/j.1600-0889.1992.t01-3-00006.x, 1992.
    • Etheridge, D. M., Steele, L. P., Langenfelds, R. L., Francey, R. J., Barnola, J. M., and Morgan, V. I.: Natural and anthropogenic changes in atmospheric CO2 over the last 1000 years from air in Antarctic ice and firn, J. Geophys. Res., 101, 4115-4128, doi:10.1029/95jd03410, 1996.
    • Fabre, A., Barnola, J. M., Arnaud, L., and Chappellaz, J.: Determination of gas diffusivity in polar firn: Comparison between experimental measurements and inverse modeling, Geophys. Res. Lett., 27, 557-560, doi:10.1029/1999GL010780, 2000.
    • Ghanbarian, B. and Hunt, A. G.: Universal scaling of gas diffusion in porous media, Water Resour. Res., 50, 2242-2256, doi:10.1002/2013WR014790, 2014.
    • Goujon, C., Barnola, J. M., and Ritz, C.: Modeling the densification of polar firn including heat diffusion: Application to closeoff characteristics and gas isotopic fractionation for Antarctica and Greenland sites, J. Geophys. Res.-Atmos., 108, 4792, doi:10.1029/2002jd003319, 2003.
    • Grachev, A. M. and Severinghaus, J. P.: Determining the thermal diffusion factor for 40Ar = 36Ar in air to aid paleoreconstruction of abrupt climate change, J. Phys. Chem. A, 107, 4636-4642, doi:10.1021/jp027817u, 2003a.
    • Grachev, A. M. and Severinghaus, J. P.: Laboratory determination of thermal diffusion constants for 29N2 = 28N2 in air at temperatures from 60 to 0 degrees C for reconstruction of magnitudes of abrupt climate changes using the ice core fossilair paleothermometer, Geochim. Cosmochim. Ac., 67, 345-360, doi:10.1016/s0016-7037(02)01115-8, 2003b.
    • Hörhold, M. W., Kipfstuhl, S., Wilhelms, F., Freitag, J., and Frenzel, A.: The densification of layered polar firn, J. Geophys. Res., 116, F01001, doi:10.1029/2009jf001630, 2011.
    • Johnsen, S. J.: Stable isotope homogenization of polar firn and ice, Proc. Symp. on Isotopes and Impurities in Snow and Ice, I.U.G.G. XVI, General Assembly, Grenoble, 210-219, Washington D.C., 1977.
    • Kageyama, M., Valdes, P. J., Ramstein, G., Hewitt, C., and Wyputta, U.: Northern Hemisphere Storm Tracks in Present Day and Last Glacial Maximum Climate Simulations: A Comparison of the European PMIP Models, J. Climate, 12, 742-760, doi:10.1175/1520-0442(1999)012<0742:NHSTIP>2.0.CO;2, 1999.
    • Kawamura, K., Severinghaus, J. P., Ishidoya, S., Sugawara, S., Hashida, G., Motoyama, H., Fujii, Y., Aoki, S., and Nakazawa, T.: Convective mixing of air in firn at four polar sites, Earth Planet. Sc. Lett., 244, 672-682, doi:10.1016/j.epsl.2006.02.017, 2006.
    • Kawamura, K., Parrenin, F., Lisiecki, L., Uemura, R., Vimeux, F., Severinghaus, J. P., Hutterli, M. A., Nakazawa, T., Aoki, S., Jouzel, J., Raymo, M. E., Matsumoto, K., Nakata, H., Motoyama, H., Fujita, S., Goto-Azuma, K., Fujii, Y., and Watanabe, O.: Northern Hemisphere forcing of climatic cycles in Antarctica over the past 360,000 years, Nature, 448, 912-916, doi:10.1038/nature06015, 2007.
    • Kawamura, K., Severinghaus, J. P., Albert, M. R., Courville, Z. R., Fahnestock, M. A., Scambos, T., Shields, E., and Shuman, C. A.: Kinetic fractionation of gases by deep air convection in polar firn, Atmos. Chem. Phys., 13, 11141-11155, doi:10.5194/acp13-11141-2013, 2013.
    • Landais, A., Barnola, J. M., Kawamura, K., Caillon, N., Delmotte, M., Van Ommen, T., Dreyfus, G., Jouzel, J., Masson-Delmotte, V., Minster, B., Freitag, J., Leuenberger, M., Schwander, J., Huber, C., Etheridge, D., and Morgan, V.: Firn-air 15N in modern polar sites and glacial-interglacial ice: a model-data mismatch during glacial periods in Antarctica?, Quaternary Sci. Rev., 25, 49-62, doi:10.1016/j.quascirev.2005.06.007, 2006.
    • Lazzara, M. A., Weidner, G. A., Keller, L. M., Thom, J. E., and Cassano, J. J.: Antarctic Automatic Weather Station Program: 30 Years of Polar Observation, B. Am. Meteorol. Soc., 93, 1519- 1537, doi:10.1175/BAMS-D-11-00015.1, 2012.
    • Leuenberger, M. C., Lang, C., and Schwander, J.: Delta15N measurements as a calibration tool for the paleothermometer and gas-ice age differences: A case study for the 8200 BP event on GRIP ice, J. Geophys. Res.-Atmos., 104, 22163-22170, doi:10.1029/1999JD900436, 1999.
    • Loulergue, L., Schilt, A., Spahni, R., Masson-Delmotte, V., Blunier, T., Lemieux, B., Barnola, J.-M., Raynaud, D., Stocker, T. F., and Chappellaz, J.: Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years, Nature, 453, 383-386, doi:10.1038/nature06950, 2008.
    • Martinerie, P., Raynaud, D., Etheridge, D. M., Barnola, J. M., and Mazaudier, D.: Physical and Climatic Parameters which Influence the Air Content in Polar Ice, Earth Planet. Sc. Lett., 112, 1-13, doi:10.1016/0012-821X(92)90002-D, 1992.
    • Mitchell, L. E., Buizert, C., Brook, E. J., Breton, D. J., Fegyveresi, J., Baggenstos, D., Orsi, A., Severinghaus, J., Alley, R. B., Albert, M., Rhodes, R. H., McConnell, J. R., Sigl, M., Maselli, O., Gregory, S., and Ahn, J.: Observing and modeling the influence of layering on bubble trapping in polar firn, J. Geophys. Res.- Atmos., 120, 2558-2574, doi:10.1002/2014JD022766, 2015.
    • Nilson, R. H., Peterson, E. W., Lie, K. H., Burkhard, N. R., and Hearst, J. R.: Atmospheric pumping: A mechanism causing vertical transport of contaminated gases through fractured permeable media, J. Geophys. Res.-Sol. Ea., 96, 21933-21948, doi:10.1029/91JB01836, 1991.
    • Orsi, A., Severinghaus, J. P., Buizert, C., Baggenstos, D., Kawamura, K., and Beaudette, R.: The inert gas isotope record at WAIS Divide, in: WAIS Divide Ice Core 2014 Science Meeting, La Jolla, CA, USA, 2014.
    • Parrenin, F., Barker, S., Blunier, T., Chappellaz, J., Jouzel, J., Landais, A., Masson-Delmotte, V., Schwander, J., and Veres, D.: On the gas-ice depth difference (1depth) along the EPICA Dome C ice core, Clim. Past, 8, 1239-1255, doi:10.5194/cp-8-1239- 2012, 2012.
    • Powers, D., O'Neill, K., and Colbeck, S.: Theory of natural convection in snow, J. Geophys. Res.-Atmos., 90, 10641-10649, 1985.
    • Raynaud, D. and Lorius, C.: Climatic implications of total gas content in ice at Camp Century, Nature, 243, 283-284, doi:10.1038/243283a0, 1973.
    • Rhodes, R. H., Faïn, X., Brook, E. J., McConnell, J. R., Maselli, O. J., Sigl, M., Edwards, J., Buizert, C., Blunier, T., Chappellaz, J., and Freitag, J.: Local artifacts in ice core methane records caused by layered bubble trapping and in situ production: a multi-site investigation, Clim. Past, 12, 1061-1077, doi:10.5194/cp-12-1061- 2016, 2016.
    • Rojas, M., Moreno, P., Kageyama, M., Crucifix, M., Hewitt, C., Abe-Ouchi, A., Ohgaito, R., Brady, E. C., and Hope, P.: The Southern Westerlies during the last glacial maximum in PMIP2 simulations, Clim. Dynam., 32, 525-548, doi:10.1007/s00382- 008-0421-7, 2009.
    • Rommelaere, V., Arnaud, L., and Barnola, J. M.: Reconstructing recent atmospheric trace gas concentrations from polar firn and bubbly ice data by inverse methods, J. Geophys. Res.-Atmos., 102, 30069-30083, doi:10.1029/97JD02653, 1997.
    • Sahimi, M., Davis, H. T., and Scriven, L.: Dispersion in disordered porous media, Chem. Eng. Commun., 23, 329-341, doi:10.1080/00986448308940483, 1983.
    • Scheidegger, A.: General theory of dispersion in porous media, J. Geophys. Res., 66, 3273-3278, 1961.
    • Scheidegger, A. E.: Statistical hydrodynamics in porous media, J. Appl. Phys., 25, 994-1001, 1954.
    • Schwander, J. and Stauffer, B.: Age difference between polar ice and the air trapped in its bubbles, Nature, 311, 45-47, doi:10.1038/311045a0, 1984.
    • Schwander, J., Stauffer, B., and Sigg, A.: Air mixing in firn and the age of the air at pore close-off, Ann. Glaciol., 10, 141-145, 1988.
    • Schwander, J., Barnola, J. M., Andrie, C., Leuenberger, M., Ludin, A., Raynaud, D., and Stauffer, B.: The Age of the Air in the Firn and the Ice at Summit, Greenland, J. Geophys. Res.-Atmos., 98, 2831-2838, doi:10.1029/92JD02383, 1993.
    • Schwander, J., Sowers, T., Barnola, J. M., Blunier, T., Fuchs, A., and Malaize, B.: Age scale of the air in the summit ice: Implication for glacial-interglacial temperature change, J. Geophys. Res.-Atmos., 102, 19483-19493, doi:10.1029/97JD01309, 1997.
    • Severinghaus, J. P., Sowers, T., Brook, E. J., Alley, R. B., and Bender, M. L.: Timing of abrupt climate change at the end of the Younger Dryas interval from thermally fractionated gases in polar ice, Nature, 391, 141-146, doi:10.1038/34346, 1998.
    • Severinghaus, J. P., Grachev, A., and Battle, M.: Thermal fractionation of air in polar firn by seasonal temperature gradients, Geochem. Geophys. Geosy., 2, 2000GC000146, doi:10.1029/2000GC000146, 2001.
    • Severinghaus, J. P., Grachev, A., Luz, B., and Caillon, N.: A method for precise measurement of argon 40/36 and krypton = argon ratios in trapped air in polar ice with applications to past firn thickness and abrupt climate change in Greenland and at Siple Dome, Antarctica, Geochim. Cosmochim. Ac., 67, 325-343, doi:10.1016/S0016-7037(02)00965-1, 2003.
    • Severinghaus, J. P., Albert, M. R., Courville, Z. R., Fahnestock, M. A., Kawamura, K., Montzka, S. A., Muhle, J., Scambos, T. A., Shields, E., Shuman, C. A., Suwa, M., Tans, P., and Weiss, R. F.: Deep air convection in the firn at a zero-accumulation site, central Antarctica, Earth Planet. Sc. Lett., 293, 359-367, doi:10.1016/j.epsl.2010.03.003, 2010.
    • Sowers, T., Bender, M., Raynaud, D., and Korotkevich, Y. S.: 15N of N2 in air trapped in polar ice: A tracer of gas transport in the firn and a possible constraint on ice age-gas age differences, J. Geophys. Res.-Atmos., 97, 15683-15697, doi:10.1029/92JD01297, 1992.
    • Sturrock, G. A., Etheridge, D. M., Trudinger, C. M., Fraser, P. J., and Smith, A. M.: Atmospheric histories of halocarbons from analysis of Antarctic firn air: Major Montreal Protocol species, J. Geophys. Res.-Atmos., 107, 4765, doi:10.1029/2002jd002548, 2002.
    • Trudinger, C. M., Enting, I. G., Etheridge, D. M., Francey, R. J., Levchenko, V. A., Steele, L. P., Raynaud, D., and Arnaud, L.: Modeling air movement and bubble trapping in firn, J. Geophys. Res.-Atmos., 102, 6747-6763, doi:10.1029/96JD03382, 1997.
    • Trudinger, C. M., Etheridge, D. M., Rayner, P. J., Enting, I. G., Sturrock, G. A., and Langenfelds, R. L.: Reconstructing atmospheric histories from measurements of air composition in firn, J. Geophys. Res.-Atmos., 107, 4780, doi:10.1029/2002jd002545, 2002.
    • Trudinger, C. M., Enting, I. G., Rayner, P. J., Etheridge, D. M., Buizert, C., Rubino, M., Krummel, P. B., and Blunier, T.: How well do different tracers constrain the firn diffusivity profile?, Atmos. Chem. Phys., 13, 1485-1510, doi:10.5194/acp-13-1485- 2013, 2013.
    • Turner, J., Phillips, T., Hosking, J. S., Marshall, G. J., and Orr, A.: The Amundsen Sea low, Int. J. Climatol., 33, 1818-1829, doi:10.1002/joc.3558, 2013.
    • WAIS Divide Project Members: Onset of deglacial warming in West Antarctica driven by local orbital forcing, Nature, 500, 440-444, doi:10.1038/nature12376, 2013.
    • WAIS Divide Project Members: Precise interpolar phasing of abrupt climate change during the last ice age, Nature, 520, 661-665, doi:10.1038/nature14401, 2015.
    • Witrant, E., Martinerie, P., Hogan, C., Laube, J. C., Kawamura, K., Capron, E., Montzka, S. A., Dlugokencky, E. J., Etheridge, D., Blunier, T., and Sturges, W. T.: A new multi-gas constrained model of trace gas non-homogeneous transport in firn: evaluation and behaviour at eleven polar sites, Atmos. Chem. Phys., 12, 11465-11483, doi:10.5194/acp-12-11465-2012, 2012.
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