Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Rodger Sparks"'
Publikováno v:
Radiocarbon. 64:435-443
Direct atmospheric14CO2measurements began in New Zealand in 1954, initially to improve14C as a dating tool, but quickly evolving into a method for understanding the carbon cycle. These early14CO2measurements immediately demonstrated the existence of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b289028e75658bff392a39001e42294e
https://doi.org/10.1017/rdc.2021.88
https://doi.org/10.1017/rdc.2021.88
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 294:1-4
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0c5bf12fb8f1d7a71792becc94db92e9
https://doi.org/10.1016/j.nimb.2012.11.008
https://doi.org/10.1016/j.nimb.2012.11.008
Autor:
Katja Riedel, Kim I. Currie, Rodger Sparks, K. R. Lassey, Gordon Brailsford, Sylvia Nichol, Antony J. Gomez
Publikováno v:
Biogeochemistry. 104:5-22
Measurements of near-sea-level tropospheric Δ14CO2 have been made at Wellington, New Zealand since December 1954; these measurements comprise the longest such record available. The Δ14C rose from −10‰ in 1955 peaking at 695‰ in 1965 as a resu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31b210ad029af200e8725254b61133d0
https://doi.org/10.1007/s10533-009-9352-6
https://doi.org/10.1007/s10533-009-9352-6
Publikováno v:
Scopus-Elsevier
We have developed sample pretreatments for silk for radiocarbon dating. Characteristics of silk under different types of pretreatment were investigated, as well as the behavior of dye and possible contaminants. We found that dye could be removed comp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3290c6c612f861803c993bdb6ecfd417
https://doi.org/10.1017/s0033822200043411
https://doi.org/10.1017/s0033822200043411
Publikováno v:
New Zealand Journal of Geology and Geophysics. 47:549-565
The last 100 000 yr record of volcaniclastic sedimentation in the Rotoaira Basin reflects the critical role played by tectonic and eruptive activity that led to: (1) the catastrophic emplacement of Te Whaiau Formation (60–55 ka); (2) major episodes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d1348b7598941fd6b123c8dc7f1b0f7c
https://doi.org/10.1080/00288306.2004.9515075
https://doi.org/10.1080/00288306.2004.9515075
Testing the effectiveness of AMS radiocarbon pretreatment and preparation on archaeological textiles
Publikováno v:
Scopus-Elsevier
Archaeological textiles are prepared and radiocarbon dated by two different methods and the results compared to demonstrate the effective removal of contaminating carbon. The distributions of ages of textiles measured at the Rafter Radiocarbon Lab fa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06f0a9e423a8b7b069600e71ea89addd
https://doi.org/10.1016/s0168-583x(00)00095-1
https://doi.org/10.1016/s0168-583x(00)00095-1
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 259:47-49
This facility report discusses progress and outcomes of three major upgrade projects on the AMS facility at GNS Science, New Zealand. Converting the EN-tandem accelerator from a belt-driven charging system to a Pelletron has reduced the fluctuations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89414694a6a53c2bf1794726f9473975
https://doi.org/10.1016/j.nimb.2007.01.146
https://doi.org/10.1016/j.nimb.2007.01.146
Autor:
Albert Zondervan, Rodger Sparks
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 123:79-83
An overview is given of the past, present and near-future status of and research with the AMS facility in New Zealand. Key elements of technological improvement are the new MC-SNICS source, Pelletron conversion of the EN tandem accelerator and modifi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc1551d6c71f24b748074091b8bd21d2
https://doi.org/10.1016/s0168-583x(96)00406-5
https://doi.org/10.1016/s0168-583x(96)00406-5
Autor:
John Southon, John B. Miller, Rodger Sparks, Pieter P. Tans, Jocelyn Turnbull, Scott J. Lehman
Publikováno v:
Journal of Geophysical Research. 112
We develop a high precision Δ 14 CO 2 measurement capability in 2-5 L samples of whole air for implementation within existing greenhouse gas flask sampling networks. The long-term repeatability of the measurement is 1.8%o (1-sigma), as determined fr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f2f00d5e7921e601e47074daaab86b4a
https://doi.org/10.1029/2006jd008184
https://doi.org/10.1029/2006jd008184
Autor:
John Southon, Jocelyn Turnbull, John B. Miller, Rodger Sparks, Scott J. Lehman, Pieter P. Tans
Publikováno v:
Geophysical Research Letters. 33
[1] We use the nearly ideal tracer 14CO2 to estimate the fossil fuel CO2 enhancement in boundary layer air at two sites in New England and Colorado. Improved Δ14C measurement precision of 1.6–2.6‰ provides fossil fuel CO2 detection capability of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e331c5a2f3aeff22f68f9eb7650177b3
https://doi.org/10.1029/2005gl024213
https://doi.org/10.1029/2005gl024213