Zobrazeno 1 - 10
of 45
pro vyhledávání: '"J. P. Severinghaus"'
Autor:
B. Hmiel, V. V. Petrenko, C. Buizert, A. M. Smith, M. N. Dyonisius, P. Place, B. Yang, Q. Hua, R. Beaudette, J. P. Severinghaus, C. Harth, R. F. Weiss, L. Davidge, M. Diaz, M. Pacicco, J. A. Menking, M. Kalk, X. Faïn, A. Adolph, I. Vimont, L. T. Murray
Publikováno v:
The Cryosphere, Vol 18, Pp 3363-3382 (2024)
Measurements of carbon-14-containing carbon monoxide (14CO) in glacial ice are useful for studies of the past oxidative capacity of the atmosphere as well as for reconstructing the past cosmic ray flux. The 14CO abundance in glacial ice represents th
Externí odkaz:
https://doaj.org/article/71cf927c464e490191c66579b882b0c2
Autor:
J. D. Patterson, M. Aydin, A. M. Crotwell, G. Pétron, J. P. Severinghaus, P. B. Krummel, R. L. Langenfelds, V. V. Petrenko, E. S. Saltzman
Publikováno v:
Climate of the Past, Vol 19, Pp 2535-2550 (2023)
Historical atmospheric H2 levels were reconstructed using firn air measurements from two sites in Greenland (NEEM and Summit) and two sites in Antarctica (South Pole and Megadunes). A joint reconstruction based on the two Antarctic sites yields H2 le
Externí odkaz:
https://doaj.org/article/6568c9917d674c8d836d20332c20b191
Autor:
J. A. Epifanio, E. J. Brook, C. Buizert, E. C. Pettit, J. S. Edwards, J. M. Fegyveresi, T. A. Sowers, J. P. Severinghaus, E. C. Kahle
Publikováno v:
The Cryosphere, Vol 17, Pp 4837-4851 (2023)
The total air content (TAC) of polar ice cores has long been considered a potential proxy for past ice sheet elevation. Recent work, however, has shown that a variety of other factors also influence this parameter. In this paper we present a high-res
Externí odkaz:
https://doaj.org/article/7134deed9aa94af9a8683c94ce1e6d57
Autor:
C. Buizert, S. Shackleton, J. P. Severinghaus, W. H. G. Roberts, A. Seltzer, B. Bereiter, K. Kawamura, D. Baggenstos, A. J. Orsi, I. Oyabu, B. Birner, J. D. Morgan, E. J. Brook, D. M. Etheridge, D. Thornton, N. Bertler, R. L. Pyne, R. Mulvaney, E. Mosley-Thompson, P. D. Neff, V. V. Petrenko
Publikováno v:
Climate of the Past, Vol 19, Pp 579-606 (2023)
Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure changes weakly disrupt gravitational isotopic settling in t
Externí odkaz:
https://doaj.org/article/51b9134e3ba344ee9899a487aecf1ada
Autor:
M. N. Dyonisius, V. V. Petrenko, A. M. Smith, B. Hmiel, P. D. Neff, B. Yang, Q. Hua, J. Schmitt, S. A. Shackleton, C. Buizert, P. F. Place, J. A. Menking, R. Beaudette, C. Harth, M. Kalk, H. A. Roop, B. Bereiter, C. Armanetti, I. Vimont, S. Englund Michel, E. J. Brook, J. P. Severinghaus, R. F. Weiss, J. R. McConnell
Publikováno v:
The Cryosphere, Vol 17, Pp 843-863 (2023)
Cosmic rays entering the Earth's atmosphere produce showers of secondary particles such as protons, neutrons, and muons. The interaction of these particles with oxygen-16 (16O) in minerals such as ice and quartz can produce carbon-14 (14C). In glacia
Externí odkaz:
https://doaj.org/article/07c7e30c42454b0aa85d33a5ab319094
Publikováno v:
The Cryosphere, Vol 16, Pp 2947-2966 (2022)
Gas isotope thermometry using the isotopes of molecular nitrogen and argon has been used extensively to reconstruct past surface temperature change from Greenland ice cores. The gas isotope ratios δ15N and δ40Ar in the ice core are each set by the
Externí odkaz:
https://doaj.org/article/bdaef5e5e2634fdc97006d6eac08b603
Autor:
I. Oyabu, K. Kawamura, T. Uchida, S. Fujita, K. Kitamura, M. Hirabayashi, S. Aoki, S. Morimoto, T. Nakazawa, J. P. Severinghaus, J. D. Morgan
Publikováno v:
The Cryosphere, Vol 15, Pp 5529-5555 (2021)
The variations of δO2/N2 and δAr/N2 in the Dome Fuji ice core were measured from 112 m (bubbly ice) to 2001 m (clathrate hydrate ice). Our method, combined with the low storage temperature of the samples (−50 ∘C), successfully excludes post-cor
Externí odkaz:
https://doaj.org/article/d0059c1a940546db8ff04f38ad24d920
Autor:
S. Shackleton, J. A. Menking, E. Brook, C. Buizert, M. N. Dyonisius, V. V. Petrenko, D. Baggenstos, J. P. Severinghaus
Publikováno v:
Climate of the Past, Vol 17, Pp 2273-2289 (2021)
Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution of ice she
Externí odkaz:
https://doaj.org/article/d11481853d1f4bbdbc4cd1631af426c0
Autor:
J. A. Epifanio, E. J. Brook, C. Buizert, J. S. Edwards, T. A. Sowers, E. C. Kahle, J. P. Severinghaus, E. J. Steig, D. A. Winski, E. C. Osterberg, T. J. Fudge, M. Aydin, E. Hood, M. Kalk, K. J. Kreutz, D. G. Ferris, J. A. Kennedy
Publikováno v:
Climate of the Past, Vol 16, Pp 2431-2444 (2020)
A new ice core drilled at the South Pole provides a 54 000-year paleoenvironmental record including the composition of the past atmosphere. This paper describes the SP19 chronology for the South Pole atmospheric gas record and complements a previou
Externí odkaz:
https://doaj.org/article/0c0612043472464eab5a0f65e13fb549
Autor:
I. Oyabu, K. Kawamura, K. Kitamura, R. Dallmayr, A. Kitamura, C. Sawada, J. P. Severinghaus, R. Beaudette, A. Orsi, S. Sugawara, S. Ishidoya, D. Dahl-Jensen, K. Goto-Azuma, S. Aoki, T. Nakazawa
Publikováno v:
Atmospheric Measurement Techniques, Vol 13, Pp 6703-6731 (2020)
Air in polar ice cores provides unique information on past climatic and atmospheric changes. We developed a new method combining wet extraction, gas chromatography and mass spectrometry for high-precision, simultaneous measurements of eight air compo
Externí odkaz:
https://doaj.org/article/1245e4bff01c47058f49d1749e5ad518