Search Results - "van Ommen, T. D."

Repeated large-scale retreat and advance of Totten Glacier indicated by inland bed erosion by Aitken, A. R. A., Roberts, J. L., Ommen, T. D. van, Young, D. A., Golledge, N. R., Greenbaum, J. S., Blankenship, D. D., Siegert, M. J.

“…The stability of the East Antarctic Ice Sheet and its contribution to past sea-level rise are not well defined; in this paper, airborne geophysical data and…”
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Ocean access to a cavity beneath Totten Glacier in East Antarctica by Greenbaum, J. S., Blankenship, D. D., Young, D. A., Richter, T. G., Roberts, J. L., Aitken, A. R. A., Legresy, B., Schroeder, D. M., Warner, R. C., van Ommen, T. D., Siegert, M. J.

“…Totten Glacier has the largest thinning rate in East Antarctica. A derivation of the sea floor bathymetry reveals entrances to the ice cavity beneath the…”
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Trends and seasonal cycles in the isotopic composition of nitrous oxide since 1940 by Park, S., Croteau, P., Boering, K. A., Etheridge, D. M., Ferretti, D., Fraser, P. J., Kim, K-R., Krummel, P. B., Langenfelds, R. L., van Ommen, T. D., Steele, L. P., Trudinger, C. M.

“…The atmospheric nitrous oxide concentration has increased by 20% since 1750. Analyses of Antarctic firn and archived air samples reveal seasonal cycles in the…”
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Changes in black carbon deposition to Antarctica from two high-resolution ice core records, 1850–2000 AD by Bisiaux, M. M, Edwards, R, McConnell, J. R, Curran, M. A. J, Van Ommen, T. D, Smith, A. M, Neumann, T. A, Pasteris, D. R, Penner, J. E, Taylor, K

“…Refractory black carbon aerosols (rBC) emitted by biomass burning (fires) and fossil fuel combustion, affect global climate and atmospheric chemistry. In the…”
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An independently dated 2000-yr volcanic record from Law Dome, East Antarctica, including a new perspective on the dating of the 1450s CE eruption of Kuwae, Vanuatu by Plummer, C. T, Curran, M. A. J, van Ommen, T D, Rasmussen, S. O, Moy, A. D, Vance, T. R, Clausen, H. B, Vinther, B. M, Mayewski, P. A

“…Volcanic eruptions are an important cause of natural climate variability. In order to improve the accuracy of climate models, precise dating and magnitude of…”
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Unexpected Changes to the Global Methane Budget over the Past 2000 Years by Ferretti, D. F, Miller, J. B, White, J. W. C, Etheridge, D. M, Lassey, K. R, Lowe, D. C, Meure, C. M. MacFarling, Dreier, M. F, Trudinger, C. M, van Ommen, T. D, Langenfelds, R. L

“…We report a 2000-year Antarctic ice-core record of stable carbon isotope measurements in atmospheric methane ([delta]¹³CH₄). Large [delta]¹³CH₄ variations…”
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Evidence of a hydrological connection between the ice divide and ice sheet margin in the Aurora Subglacial Basin, East Antarctica by Wright, A. P., Young, D. A., Roberts, J. L., Schroeder, D. M., Bamber, J. L., Dowdeswell, J. A., Young, N. W., Le Brocq, A. M., Warner, R. C., Payne, A. J., Blankenship, D. D., van Ommen, T. D., Siegert, M. J.

“…Subglacial hydrology in East Antarctica is poorly understood, yet may be critical to the manner in which ice flows. Data from a new regional airborne…”
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Interdecadal Pacific variability and eastern Australian megadroughts over the last millennium by Vance, T. R., Roberts, J. L., Plummer, C. T., Kiem, A. S., van Ommen, T. D.

“…The Interdecadal Pacific Oscillation (IPO) influences multidecadal drought risk across the Pacific, but there are no millennial‐length, high‐resolution IPO…”
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Beryllium-10 transport to Antarctica: Results from seasonally resolved observations and modeling by Pedro, J. B., Heikkilä, U. E., Klekociuk, A., Smith, A. M., van Ommen, T. D., Curran, M. A. J.

“…Cosmogenic 10Be measured in polar ice cores has important application in the reconstruction of past solar activity. However, the processes controlling its…”
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Characterizing black carbon in rain and ice cores using coupled tangential flow filtration and transmission electron microscopy by Ellis, A, Edwards, R, Saunders, M, Chakrabarty, R. K, Subramanian, R, van Riessen, A, Smith, A. M, Lambrinidis, D, Nunes, L. J, Vallelonga, P, Goodwin, I. D, Moy, A. D, Curran, M. A. J, van Ommen, T. D

“…Antarctic ice cores have been used to study the history of black carbon (BC), but little is known with regards to the physical and chemical characteristics of…”
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Tropical and mid-latitude forcing of continental Antarctic temperatures by Turney, C. S. M, Fogwill, C. J, Klekociuk, A. R, van Ommen, T. D, Curran, M. A. J, Moy, A. D, Palmer, J. G

“…Future changes in atmospheric circulation and associated modes of variability are a major source of uncertainty in climate projections. Nowhere is this issue…”
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Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades by Roberts, J. L, Moy, A. D, van Ommen, T. D, Curran, M. A. J, Worby, A. P, Goodwin, I. D, Inoue, M

“…A borehole temperature record from the Mill Island (East Antarctica) icecap reveals a large surface warming signal manifested as a 0.75 K temperature…”
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Mid latitude winter climate variability in the South Indian and southwest Pacific regions since 1300 AD by GOODWIN, I. D, VAN OMMEN, T. D, CURRAN, M. A. J, MAYEWSKI, P. A

“…Mid-latitude winter atmospheric variability in the South Indian Ocean and southwest Pacific Ocean regions of the circum-Antarctic are reconstructed using…”
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Tightened constraints on the time-lag between Antarctic temperature and CO2 during the last deglaciation by Pedro, J B, Rasmussen, S O, van Ommen, T D

“…Antarctic ice cores provide clear evidence of a close coupling between variations in Antarctic temperature and the atmospheric concentration of CO2 during the…”
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The last deglaciation: timing the bipolar seesaw by Pedro, J. B., van Ommen, T. D., Rasmussen, S. O., Morgan, V. I., Chappellaz, J., Moy, A. D., Masson-Delmotte, V., Delmotte, M.

“…Precise information on the relative timing of north-south climate variations is a key to resolving questions concerning the mechanisms that force and couple…”
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Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination by Fogwill, C. J., Turney, C. S. M., Golledge, N. R., Etheridge, D. M., Rubino, M., Thornton, D. P., Baker, A., Woodward, J., Winter, K., van Ommen, T. D., Moy, A. D., Curran, M. A. J., Davies, S. M., Weber, M. E., Bird, M. I., Munksgaard, N. C., Menviel, L., Rootes, C. M., Ellis, B., Millman, H., Vohra, J., Rivera, A., Cooper, A.

“…Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,000–11,650 yrs ago) allows us to…”
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Refined broad-scale sub-glacial morphology of Aurora Subglacial Basin, East Antarctica derived by an ice-dynamics-based interpolation scheme by Roberts, J. L., Warner, R. C., Young, D., Wright, A., van Ommen, T. D., Blankenship, D. D., Siegert, M., Young, N. W., Tabacco, I. E., Forieri, A., Passerini, A., Zirizzotti, A., Frezzotti, M.

“…Ice thickness data over much of East Antarctica are sparse and irregularly distributed. This poses difficulties for reconstructing the homogeneous coverage…”
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Southern Ocean carbon sink enhanced by sea-ice feedbacks at the Antarctic Cold Reversal by Fogwill, C. J., Turney, C. S. M., Menviel, L., Baker, A., Weber, M. E., Ellis, B., Thomas, Z. A., Golledge, N. R., Etheridge, D., Rubino, M., Thornton, D. P., van Ommen, T. D., Moy, A. D., Curran, M. A. J., Davies, S., Bird, M. I., Munksgaard, N. C., Rootes, C. M., Millman, H., Vohra, J., Rivera, A., Mackintosh, A., Pike, J., Hall, I. R., Bagshaw, E. A., Rainsley, E., Bronk-Ramsey, C., Montenari, M., Cage, A. G., Harris, M. R. P., Jones, R., Power, A., Love, J., Young, J., Weyrich, L. S., Cooper, A.

“…The Southern Ocean occupies 14% of the Earth’s surface and plays a fundamental role in the global carbon cycle and climate. It provides a direct connection to…”
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VLBI Observations of Gamma-Ray-quiet Active Galactic Nuclei: Comparing Radio-Core Brightness Temperatures by Tingay, S. J, Murphy, D. W, Lovell, J. E. J, Costa, M. E, McCulloch, P, Edwards, P. G, Jauncey, D. L, Reynolds, J. E, Tzioumis, A. K, King, E. A, Jones, D. L, Preston, R. A, Meier, D. L, van Ommen, T. D, Nicolson, G. D, Quick, J. F. H

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Reconciling Unevenly Sampled Paleoclimate Proxies: a Gaussian Kernel Correlation Multiproxy Reconstruction by Roberts, J. L., Tozer, C. R., Ho, M., Kiem, A. S., Vance, T. R., Jong, L. M., McCormack, F. S., van Ommen, T. D.

“…Reconstructing past hydroclimatic variability using climate-sensitive paleoclimate proxies provides context to our relatively short instrumental climate…”
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