High-Precision Measurement of N2O Concentration in Ice Cores

2018 ◽  
Vol 52 (2) ◽  
pp. 731-738 ◽  
Author(s):  
Yeongjun Ryu ◽  
Jinho Ahn ◽  
Ji-Woong Yang
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Ice Cores ◽  
High Precision Measurement

CSIRO High-precision Measurement of Atmospheric CO2 Concentration in Australia. Part 1: Initial Motivation, Techniques and Aircraft Sampling

2017 ◽  
Vol 28 (2) ◽  
pp. 111 ◽  
Author(s):  
Graeme I. Pearman ◽  
John R. Garratt ◽  
Paul J. Fraser
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Measurement Techniques ◽  
Ice Cores ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
High Precision Measurement ◽  
Concentration Data ◽  
Atmospheric Co2 Concentration ◽  
The Impact

The potential for carbon dioxide (CO2) in the atmosphere to influence global surface temperatures was first recognized in the mid-nineteenth century. Even so, high-precision measurements of atmospheric CO2 concentration were not commenced until the International Geophysical Year (1957–8), following concerns of the climatic impact of increased use of fossil fuels and the concomitant release of CO2 into the atmosphere. In Australia, an early (1960s–70s) interest in the high-precision measurement of CO2 concentration was stimulated by a study of the photosynthesis and respiration of awheat crop. This study conducted in north-easternVictoria during 19717–2 led two young CSIRO scientists, J. R. Garratt and G. I. Pearman, encouraged by their Chief, C. H. B. Priestley, to extend micro-environment CO2 studies to larger-scale measurements of CO2 concentration in the background atmosphere. The significant extension of the observation programme required refined measurement techniques to improve both the precision and absolute comparability with observations made by laboratories overseas. Joined in 1974 by P. J. Fraser, they identified the impact of pressure broadening on calibration techniques used in the non-dispersive infrared absorption method of CO2 concentration measurement. This, in turn, led to improved inter-comparability of CO2 concentration data collected around the globe. Acomprehensive aircraft-based air sampling programmewas established in the early 1970s, leading to increased understanding of the time and space variability of CO2 concentration throughout the depth of the troposphere and lower stratosphere in the mid-latitudes of the Southern Hemisphere. In turn this led to: (i) the establishment of a permanent ground-based observatory at Cape Grim, north-western Tasmania; (ii) the development of carbon cycle models; and (iii) measurements of 12CO2, 13CO2 and 14CO2 relative abundances in current and past atmospheres, the last from air samples trapped in ice cores (described in Part 2, the companion paper). The accumulated data from these studies, together with those collected by international colleagues, form the basis of our understanding of the changes of CO2 concentration over thousands of years. In addition, the data have contributed to our understanding of the mechanisms of past and present biogeochemical cycling of CO2 that provides the predictive basis for future changes in CO2 concentration.

High precision measurement of the SOS surface thickness in the rough phase

1991 ◽  
Vol 1 (12) ◽  
pp. 1669-1673 ◽  
Author(s):  
Hans Gerd Evertz ◽  
Martin Hasenbusch ◽  
Mihail Marcu ◽  
Klaus Pinn ◽  
Sorin Solomon
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
High Precision Measurement ◽  
Surface Thickness

scholarly journals BATCH PROCESSING OF TREE-RING SAMPLES FOR RADIOCARBON ANALYSIS

Radiocarbon ◽  
2020 ◽  
pp. 1-13
Author(s):  
Alexandra Fogtmann-Schulz ◽  
Sabrina G K Kudsk ◽  
Florian Adolphi ◽  
Christoffer Karoff ◽  
Mads F Knudsen ◽  
...  
Keyword(s):  
High Precision ◽  
Tree Rings ◽  
Precision Measurement ◽  
Radiocarbon Dating ◽  
The Other ◽  
High Precision Measurement ◽  
Machine Performance ◽  
High Throughput Method ◽  
Ca 50 ◽  
Low Activity

ABSTRACT We here present a comparison of methods for the pretreatment of a batch of tree rings for high-precision measurement of radiocarbon at the Aarhus AMS Centre (AARAMS), Aarhus University, Denmark. The aim was to develop an efficient and high-throughput method able to pretreat ca. 50 samples at a time. We tested two methods for extracting α-cellulose from wood to find the most optimal for our use. One method used acetic acid, the other used HCl acid for the delignification. The testing was conducted on background 14C samples, in order to assess the effect of the different pretreatment methods on low-activity samples. Furthermore, the extracted wood and cellulose fractions were analyzed using Fourier transform infrared (FTIR) spectroscopy, which showed a successful extraction of α-cellulose from the samples. Cellulose samples were pretreated at AARAMS, and the graphitization and radiocarbon analysis of these samples were done at both AARAMS and the radiocarbon dating laboratory at Lund University to compare the graphitization and AMS machine performance. No significant offset was found between the two sets of measurements. Based on these tests, the pretreatment of tree rings for high-precision radiocarbon analysis at AARAMS will henceforth use HCI for the delignification.

The high precision measurement of 208Pb+208Pb Mott scattering at energies under the Coulomb barrier: the observation of new atomic effects

1995 ◽  
Vol 583 ◽  
pp. 263-267 ◽  
Author(s):  
A. Lépine-Szily ◽  
J.M. Casandjian ◽  
W. Mittig ◽  
A.C.C. Villari ◽  
R. Lichtenthäler Filho ◽  
...  
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Coulomb Barrier ◽  
High Precision Measurement ◽  
Mott Scattering

scholarly journals Acrylic target vessels for a high-precision measurement of θ13with the Daya Bay antineutrino detectors

2012 ◽  
Vol 7 (06) ◽  
pp. P06004-P06004 ◽  
Author(s):  
H R Band ◽  
R L Brown ◽  
J Cherwinka ◽  
J Cao ◽  
Y Chang ◽  
...  
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Daya Bay ◽  
High Precision Measurement

High precision measurement of silicon in naphthas by ICP-OES using isooctane as diluent

Talanta ◽  
2017 ◽  
Vol 164 ◽  
pp. 563-569 ◽  
Author(s):  
M.F. Gazulla ◽  
M. Rodrigo ◽  
M. Orduña ◽  
M.J. Ventura ◽  
C. Andreu
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
Icp Oes ◽  
High Precision Measurement
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