Results 31 to 40 of about 737,718 (307)
Automated ice-core layer-counting with strong univariate signals [PDF]
, 2012 We present an automated process for determining the annual layer chronology of an ice-core with a strong annual signal, utilising the hydrogen peroxide record from an Antarctic Peninsula ice-core as a test signal on which to count annual cycles and ...
Abram, N.J. +5 more
core +2 more sources
The Chernobyl Reference Horizon (?) in the Greenland Ice Sheet [PDF]
, 1989 Published reports of the presence of radioactive debris from the Chernobyl reactor accident in snow on the Greenland ice sheet raised the strong prospect that such debris might constitute a valuable time stratigraphic marker all over the ice sheet. Large
Dibb, Jack E.
core +2 more sources
Methanol Formation via Oxygen Insertion Chemistry in Ices [PDF]
The Astrophysical Journal, 2017 Abstract We present experimental constraints on the insertion of oxygen atoms into methane to form methanol in astrophysical ice analogs. In gas-phase and theoretical studies this process has previously been demonstrated to have a very low or nonexistent energy barrier, but the energetics and mechanisms have not yet been characterized in
Jennifer B. Bergner +2 more
openaire +3 more sources
Journal of Glaciology, 2018 Past atmospheric pollution can be reconstructed from ice core trace element records retrieved from mountain glaciers. However, the current global temperature increase can result in post-depositional melt processes, significantly altering the originally ...
SVEN ERIK AVAK +2 more
doaj +1 more source
Parameterization of atmosphere–surface exchange of CO2 over sea ice [PDF]
The Cryosphere, 2014 We suggest the application of a flux parameterization commonly used over terrestrial areas for calculation of CO2 fluxes over sea ice surfaces. The parameterization is based on resistance analogy.
L. L. Sørensen +8 more
doaj +1 more source
Journal of Glaciology, 2018 The stable oxygen isotope composition, major ions and isotopic compositions of strontium (Sr), neodymium (Nd) and lead (Pb) in insoluble dust from recent surface snow samples along the transect from the Zhongshan and Progress stations (located on the ...
ZHIHENG DU +3 more
doaj +1 more source
, 2012 The observed gas-phase molecular inventory of hot cores is believed to be significantly impacted by the products of chemistry in interstellar ices. In this study, we report the construction of a full macroscopic Monte Carlo model of both the gas-phase ...
Herbst, E., Vasyunin, A. I.
core +1 more source
Beryllium-7 and Lead-210 in the atmosphere and surface snow over the Greenland ice sheet in the summer of 1989 [PDF]
, 1990 The concentrations of 7Be and 210Pb were measured in surface air and fresh and aging snow samples from Summit (72°20′N, 38°45′W) and Dye 3 (65°10′N, 44°45′W) Greenland, during June and July 1989.
Dibb, Jack E.
core +2 more sources
The effects of Ca++ on the strength of polycrystalline ice
Journal of Glaciology, 2016 Recent studies have suggested a physical link between Ca++ ions and an increase in the ductility or ‘softening’ of polycrystalline ice. In order to investigate the potential effects of Ca++ on deformation, we created sets of both undoped and CaSO4-doped ...
KEVIN HAMMONDS, IAN BAKER
doaj +1 more source
Astrochemistry of dust, ice and gas: introduction and overview
, 2014 A brief introduction and overview of the astrochemistry of dust, ice and gas and their interplay is presented, aimed at non-specialists. The importance of basic chemical physics studies of critical reactions is illustrated through a number of recent ...
van Dishoeck, Ewine F.
core +1 more source