Results 41 to 50 of about 740,577 (309)
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
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 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
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
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
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
Observational evidence for the convective transport of dust over the central United States [PDF]
, 2016 Bulk aerosol composition and aerosol size distributions measured aboard the DC-8 aircraft during the Deep Convective Clouds and Chemistry Experiment mission in May/June 2012 were used to investigate the transport of mineral dust through nine storms ...
Anderson, B. E. +15 more
core +3 more sources
Beyond the pseudo-time-dependent approach: chemical models of dense core precursors
, 2010 Context: Chemical models of dense cloud cores often utilize the so-called pseudo-time-dependent approximation, in which the physical conditions are held fixed and uniform as the chemistry occurs.
Bergin +48 more
core +1 more source
Frontiers in Astronomy and Space Sciences, 2022 Heterogeneous radical processes on ice surfaces play a vital role in the formation of building blocks of the biologically relevant molecules in space. Therefore, quantitative mechanistic details of the radical binding and radical reactions on ices are ...
W. M. C. Sameera +9 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