R. Beaudette
University of California, San Diego
11 Papers
15 Citations
R. Beaudette is an academic researcher from University of California, San Diego. The author has contributed to research in topics: Ice core & Geology. The author has an hindex of 5, co-authored 7 publications. Previous affiliations of R. Beaudette include Scripps Institution of Oceanography.
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Papers
Preindustrial 14CH4 indicates greater anthropogenic fossil CH4 emissions.
B. Hmiel,Vasilii V. Petrenko,M. Dyonisius,Christo Buizert,Andrew Smith,P. Place,C. M. Harth,R. Beaudette,Quan Hua,B. Yang,I. Vimont,S. E. Michel,Jeffrey P. Severinghaus,David Etheridge,T. Bromley,Jochen Schmitt,Xavier Faïn,Ray F. Weiss,Edward J. Dlugokencky +18 more
TL;DR: Preindustrial-era ice core 14CH4 measurements are used to show that natural geological methane emissions to the atmosphere were about 1.6 teragrams CH4 per year, with a maximum of 5.4 teragramed per year (95% confidence limit)—an order of magnitude lower than the currently used estimates.
Antarctic surface temperature and elevation during the Last Glacial Maximum
Christo Buizert,Tyler J. Fudge,William H. G. Roberts,Eric J. Steig,Sam Sherriff-Tadano,Catherine Ritz,Eric Lefebvre,J. S. Edwards,Kenji Kawamura,Kenji Kawamura,Kenji Kawamura,Ikumi Oyabu,Hideaki Motoyama,Emma C. Kahle,Tyler R. Jones,Ayako Abe-Ouchi,Takashi Obase,Carlos Martín,Hugh F. J. Corr,Jeffrey P. Severinghaus,R. Beaudette,Jenna Epifanio,Edward J. Brook,Kaden Martin,Jérôme Chappellaz,Shuji Aoki,Takakiyo Nakazawa,Todd A Sowers,Richard B. Alley,Jinho Ahn,Michael Sigl,Mirko Severi,Nelia Dunbar,Anders Svensson,John M. Fegyveresi,Chengfei He,Zhengyu Liu,Jiang Zhu,Bette L. Otto-Bliesner,Vladimir Ya. Lipenkov,Masa Kageyama,Jakob Schwander +41 more
TL;DR: In this paper, the authors reconstruct the magnitude and spatial pattern of Last Glacial Maximum surface cooling in Antarctica using borehole thermometry and firn properties in seven ice cores, and show that East Antarctic sites show a range from 4° to 7°C cooling, consistent with the results of global climate models when the effects of topographic changes indicated with ice core air-content data are included, but less than those indicated with the use of water-stable isotopes calibrated against modern spatial gradients.
Old carbon reservoirs were not important in the deglacial methane budget
M. Dyonisius,Vasilii V. Petrenko,Andrew Smith,Quan Hua,B. Yang,Jochen Schmitt,Jonas Beck,Barbara Seth,Michael Bock,B. Hmiel,I. Vimont,J. A. Menking,S. Shackleton,Daniel Baggenstos,Daniel Baggenstos,T. K. Bauska,T. K. Bauska,Rachael H. Rhodes,Rachael H. Rhodes,Peter Sperlich,R. Beaudette,C. M. Harth,M. Kalk,Edward J. Brook,Hubertus Fischer,Jeffrey P. Severinghaus,Ray F. Weiss +26 more
TL;DR: Ice core isotopic measurements of methane from the last deglaciation are presented, which is a partial analog for modern warming and show that methane emissions from old carbon reservoirs in response to deglacial warming were small and argue against similar methane emissions in responseto future warming.
The SP19 chronology for the South Pole Ice Core – Part 1: volcanic matching and annual layer counting
D. Winski,Tyler J. Fudge,David G. Ferris,Erich C. Osterberg,John M. Fegyveresi,Jihong Cole-Dai,Z. R. Thundercloud,Thomas S. Cox,Karl J. Kreutz,Nikolas Ortman,Christo Buizert,Jenna Epifanio,Edward J. Brook,R. Beaudette,Jeffrey P. Severinghaus,Todd Sowers,Eric J. Steig,Emma C. Kahle,Tyler R. Jones,Valerie Morris,Murat Aydin,M. R. Nicewonger,Kimberly A. Casey,Kimberly A. Casey,Richard B. Alley,Edwin D. Waddington,Nels Iverson,Nelia W. Dunbar,R. C. Bay,Joseph M. Souney,Michael Sigl,Joseph R. McConnell +31 more
TL;DR: The South Pole Ice Core (SPICEcore) was used to provide a detailed multi-proxy archive of paleoclimate conditions in East Antarctica during the Holocene and late Pleistocene.
New technique for high-precision, simultaneous measurements of CH 4 , N 2 O and CO 2 concentrations; isotopic and elemental ratios of N 2 , O 2 and Ar; and total air content in ice cores by wet extraction
Ikumi Oyabu,Kenji Kawamura,Kenji Kawamura,Kenji Kawamura,Kyotaro Kitamura,Remi Dallmayr,Akihiro Kitamura,Chikako Sawada,Jeffrey P. Severinghaus,R. Beaudette,Anais Orsi,Satoshi Sugawara,Shigeyuki Ishidoya,Dorthe Dahl-Jensen,Dorthe Dahl-Jensen,Kumiko Goto-Azuma,Kumiko Goto-Azuma,Shuji Aoki,Takakiyo Nakazawa +18 more
TL;DR: In this article, a new method combining wet extraction, gas chromatography and mass spectrometry was developed for high-precision, simultaneous measurements of eight air components (CH4, N2O and CO2 concentrations, δ15N, N 2O, O 2, δO2/N2, O 3, O 4, O 2 and O 4 ) from an ice core sample of ~60'g.