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Wilson, D.
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Wilson, D.
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- PublicationRestrictedAstrochronology of the Mediterranean Langhian between 15.29 and 14.17 Ma(2010-02)
; ; ; ; ; ; ; ;Hüsing, S. K.; Paleomagnetic Laboratory “Fort Hoofddijk”, Department of Earth Sciences, Budapestlaan 17, 3584 CD Utrecht, The Netherlands ;Cascella, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Hilgen, F. J.; Stratigraphy/Paleontology, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands ;Krijgsman, W.; Paleomagnetic Laboratory “Fort Hoofddijk”, Department of Earth Sciences, Budapestlaan 17, 3584 CD Utrecht, The Netherlands ;Kuiper, K. F.; Department of Isotope Geochemistry, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands ;Turco, E.; Dip. di Scienze della Terra, Universita di Parma, Parco Area della Scienze 157/A, 43100 Parma, Italy ;Wilson, D.; Department of Geological Sciences, University of California, Santa Barbara, CA 93106, USA ;; ; ; ; ; An integrated high-resolution magnetobiocyclostratigraphy including radioisotopic dating and astronomical tuning is presented for the interval between 15.29 and 14.17 Ma in the marine La Vedova section in northern Italy. The natural remanent magnetization is carried by the iron sulphide greigite and the resultant magnetostratigraphy can be correlated straightforwardly to the interval ranging from C5Bn.2n to C5ADn in the Astronomically Tuned Neogene Time Scale (ATNTS2004). Spectral analysis on high-resolution magnetic susceptibility and geochemical proxy records in the depth domain and, using our magnetobiostratigraphic age model, in the time domain demonstrate that the various scales of cyclicity in the section are related to astronomical climate forcing. Starting from our initial age model, larger-scale cycles were first tuned to eccentricity. This first-order tuning was followed by tuning the basic cycle to precession and boreal summer insolation using inferred phase relations between maxima in Ca/Al, redox-sensitive elements and Ba, and minima in magnetic susceptibility, and maxima in precession and minima in obliquity and boreal summer insolation. Our astronomical ages for reversal boundaries are supported by analysis of sea floor spreading rates and should replace the existing ages in the ATNTS2004 lacking direct astronomical control. Two major steps in the geochemical proxy records, astronomically dated at 15.074 and 14.489 Ma, coincide with abrupt changes in sedimentation rate, and are the result of the combined effect of the ∼400-kyr eccentricity cycle superimposed upon a longer-term climatic or tectonic induced trend.285 24 - PublicationOpen AccessBedmap2: improved ice bed, surface and thickness datasets for Antarctica(2013)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Fretwell, P.; British Antarctic Survey, Cambridge, UK ;Pritchard, H. D.; British Antarctic Survey, Cambridge, UK ;Vaughan, D. G.; British Antarctic Survey, Cambridge, UK ;Bamber, J. L.; School of Geographical Sciences, University of Bristol, UK ;Barrand, N. E.; British Antarctic Survey, Cambridge, UK ;Bell, R.; Lamont-Doherty Earth Observatory of Columbia University, Palisades, USA ;Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bingham, R. G.; School of Geosciences, University of Aberdeen, UK ;Blankenship, D. D.; Institute for Geophysics, University of Texas at Austin, USA ;Casassa, G.; Centro de Estudios Cientificos, Santiago, Chile ;Catania, G.; Institute for Geophysics, University of Texas at Austin, USA ;Callens, D.; Laboratoire de Glaciologie, Universit´e Libre de Bruxelles, Brussels, Belgium ;Conway, H.; Earth and Space Sciences, University of Washington, Seattle, USA ;Cook, A. J.; Department of Geography, Swansea University, Swansea, UK ;Corr, H. F. J.; British Antarctic Survey, Cambridge, UK ;Damaske, D.; Federal Institute for Geosciences and Natural Resources, Hannover, Germany ;Damm, V.; Federal Institute for Geosciences and Natural Resources, Hannover, Germany ;Ferraccioli, F.; British Antarctic Survey, Cambridge, UK ;Forsberg, R.; National Space Institute, Technical University of Denmark, Denmark ;Fujita, S.; National Institute of Polar Research, Tokyo, Japan ;Gim, Y.; Jet Propulsion Laboratory. California Institute of Technology, Pasadena, USA ;Gogineni, P.; Electrical Engineering & Computer Science, University of Kansas, Lawrence, USA ;Griggs, J. A.; School of Geographical Sciences, University of Bristol, UK ;Hindmarsh, R. C. A.; British Antarctic Survey, Cambridge, UK ;Holmlund, P.; Stockholm University, Stockholm, Sweden ;Holt, J. W.; Institute for Geophysics, University of Texas at Austin, USA ;Jacobel, R. W.; St. Olaf College, Northfield, MN 55057, USA ;Jenkins, A.; British Antarctic Survey, Cambridge, UK ;Jokat, W.; Alfred Wegener Institute, Bremerhaven, Germany ;Jordan, T.; British Antarctic Survey, Cambridge, UK ;King, E. C.; British Antarctic Survey, Cambridge, UK ;Kohler, J.; Norwegian Polar Institute, Fram Centre, Tromsø, Norway ;Krabill, W.; NASA Wallops Flight Facility, Virginia, USA ;Riger-Kusk, M.; College of Science, University of Canterbury, Christchurch, New Zealand ;Langley, K. A.; Department of Geosciences, University of Oslo, Norway ;Leitchenkov, G.; Institute for Geology and Mineral Resources of the World Ocean, St.-Petersburg, Russia ;Leuschen, C.; Electrical Engineering & Computer Science, University of Kansas, Lawrence, USA ;Luyendyk, B. P.; Earth Research Institute, University of California in Santa Barbara, USA ;Matsuoka, K.; Norwegian Polar Institute, Tromso, Norway ;Mouginot, J.; Department of Earth System Science, University of California, Irvine, USA ;Nitsche, F. O.; Lamont-Doherty Earth Observatory of Columbia University, Palisades, USA ;Nogi, Y.; National Institute of Polar Research, Tokyo, Japan ;Nost, O. A.; Norwegian Polar Institute, Tromso, Norway ;Popov, S. V.; Polar Marine Geosurvey Expedition, St.-Petersburg, Russia ;Rignot, E.; School of Physical Sciences, University of California, Irvine, USA ;Rippin, D. M.; Environment Department, University of York, Heslington, York, YO10 5DD, UK ;Rivera, A.; Centro de Estudios Cientificos, Santiago, Chile ;Roberts, J.; Department of Sustainability, Environment, Water, Population and Communities, Australian Antarctic Division, Hobart, Tasmania, Australia ;Ross, N.; School of Geography, Politics and Sociology, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK ;Siegert, M. J.; School of Geographical Sciences, University of Bristol, UK ;Smith, A. M.; British Antarctic Survey, Cambridge, UK ;Steinhage, D.; Alfred Wegener Institute, Bremerhaven, Germany ;Studinger, M.; NASA Goddard Space Flight Center, Greenbelt, USA ;Sun, B.; Polar Research Institute of China, Shanghai, China ;Tinto, B. K.; Lamont-Doherty Earth Observatory of Columbia University, Palisades, USA ;Welch, B. C.; Alfred Wegener Institute, Bremerhaven, Germany ;Wilson, D.; Institute for Crustal Studies, University of California in Santa Barbara, USA ;Young, D. A.; Institute for Geophysics, University of Texas at Austin, USA ;Xiangbin, C.; Polar Research Institute of China, Shanghai, China ;Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; We present Bedmap2, a new suite of gridded products describing surface elevation, ice-thickness and the seafloor and subglacial bed elevation of the Antarctic south of 60 S. We derived these products using data from a variety of sources, including many substantial surveys completed since the original Bedmap compilation (Bedmap1) in 2001. In particular, the Bedmap2 ice thickness grid is made from 25 million measurements, over two orders of magnitude more than were used in Bedmap1. In most parts of Antarctica the subglacial landscape is visible in much greater detail than was previously available and the improved datacoverage has in many areas revealed the full scale of mountain ranges, valleys, basins and troughs, only fragments of which were previously indicated in local surveys. The derived statistics for Bedmap2 show that the volume of ice contained in the Antarctic ice sheet (27 million km3) and its potential contribution to sea-level rise (58 m) are similar to those of Bedmap1, but the mean thickness of the ice sheet is 4.6% greater, the mean depth of the bed beneath the grounded ice sheet is 72m lower and the area of ice sheet grounded on bed below sea level is increased by 10 %. The Bedmap2 compilation highlights several areas beneath the ice sheet where the bed elevation is substantially lower than the deepest bed indicated by Bedmap1. These products, along with grids of data coverage and uncertainty, provide new opportunities for detailed modelling of the past and future evolution of the Antarctic ice sheets.1028 456