Výsledky vyhledávání - "Stewart A. Freeman"

Ice-free valleys in the Neptune Range of the Pensacola Mountains, Antarctica: glacial geomorphology, geochronology and potential as palaeoenvironmental archives

Autor: David J.A. Evans, Stewart P.H.T. Freeman, Michael J. Bentley, David Small, Andrew S. Hein

Publikováno v: Antarctic Science, 2021, Vol.33(4), pp.428-455 [Peer Reviewed Journal]

We describe the glacial geomorphology and initial geochronology of two ice-free valley systems within the Neptune Range of the Pensacola Mountains, Antarctica. These valleys are characterized by landforms associated with formerly more expanded ice sh

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b321251c5c8410b655d2e5e5d47fd8e
http://dro.dur.ac.uk/33660/1/33660.pdf

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14C wiggle-matching of short tree-ring sequences from post-medieval buildings in England

Autor: Cathy Tyers, Gordon Cook, T. Doğan, S. Farid, Alex Bayliss, E. İlkmen, Timothy D J Knowles, Stewart P.H.T. Freeman, C. Bronk Ramsey, Peter Marshall

Publikováno v: Marshall, P, Bayliss, A, Farid, S, Tyers, C, Bronk Ramsey, C, Cook, G, Doğan, T, Freeman, S P H T, İlkmen, E & Knowles, T 2019, ' 14 C wiggle-matching of short tree-ring sequences from post-medieval buildings in England ', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 438, pp. 218-226 . https://doi.org/10.1016/j.nimb.2018.03.018

This study tests whether accurate dating by AMS radiocarbon wiggle-matching short tree-ring series (c. 30 annual rings) in the period after AD 1510 can be achieved routinely. Such an approach has proved problematic for some intervals in the period AD

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c1ba12d8449007c9e93d7eab0eec1dc
https://doi.org/10.1016/j.nimb.2018.03.018

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The origins and implications of paleochannels in hyperarid, tectonically active regions: The northern Atacama Desert, Chile

Autor: Finlay M. Stuart, Stefan Heinze, C. Lenting, Tibor J. Dunai, K. Niemann, Klaus Reicherter, Stewart P.H.T. Freeman, Steven A. Binnie, P. Victor, A. Binnie, Gabriel González

Publikováno v: Global and Planetary Change

Preserved remnants of fluvial activity in deserts constitute evidence for changing boundary conditions. The Atacama Desert of northern Chile is the global end-member for aridity, so the history of relict stream networks in this region is a record of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed5e6644c60c2bd6ff6523dfcbf6cb53
https://gfzpublic.gfz-potsdam.de/pubman/item/item_4801910

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Late Pleistocene glaciations at Lake Donggi Cona, eastern Kunlun Shan (NE Tibet): early maxima and a diminishing trend of glaciation during the last glacial cycle

Autor: David Loibl, Henrik Rother, Georg Stauch, Frank Lehmkuhl, Stewart P.H.T. Freeman

Publikováno v: Boreas. 46:503-524

The Burhan Budai Shan in NE Tibet represents a key location for examining the variable influence of the mid-latitude westerly and monsoonal circulations on late Quaternary glaciations in this sector of the Tibetan Plateau. Our study investigates the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f13295757d8ec1c0aaa9a92eb605086c
https://doi.org/10.1111/bor.12227

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Analysis of 129I and 127I in soils of the Chernobyl Exclusion Zone, 29 years after the deposition of 129I

Autor: Stewart P.H.T. Freeman, Maria Izquierdo, Xiaolin Hou, Scott D. Young, L.P. Field, Claire M. Wells, Sergey P. Gaschak, Sheng Xu, Neil M.J. Crout, Elizabeth H. Bailey, George Shaw

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
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Shaw, G, Bailey, E, Crout, N, Field, L, Freeman, S, Gaschak, S, Hou, X, Izquierdo, M, Wells, C, Xu, S & Young, S 2019, ' Analysis of 129 I and 127 I in soils of the Chernobyl Exclusion Zone, 29 years after the deposition of 129 I ', Science of the Total Environment, vol. 692, pp. 966-974 . https://doi.org/10.1016/j.scitotenv.2019.07.319

The Chernobyl Exclusion Zone (CEZ) represents a unique natural laboratory that received significant 129I contamination across a range of soils and land-use types in a short time period in 1986. Data are presented on 129I and 127I in soil samples coll

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc8d2e4545e1c9ad0bad13817d24183b

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Identification of 129I interferences in accelerator mass spectrometry

Autor: Stewart P.H.T. Freeman, Sheng Xu

The identification of interferences to 129In+ (n = 3–6) was conducted with a 5 MV tandem accelerator mass spectrometer at SUERC. In addition to 128Te, the detectable interferences to 12 MeV 129I3+ ions include 43Ca1+ and 86Sr2+ which are likely inj

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae0c616a439021694f5a61df87a8ef74
https://eprints.gla.ac.uk/165761/13/165761.pdf

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Preliminary results of CoQtz-N: A quartz reference material for terrestrial in-situ cosmogenic 10Be and 26Al measurements

Publikováno v: Nuclear Instruments and Methods in Physics Research / B
Binnie, S A, Dewald, A, Heinze, S, Voronina, E, Hein, A, Wittmann, H, Von Blanckenburg, F, Hetzel, R, Christl, M, Schaller, M, Léanni, L, Aster Team, Hippe, K, Vockenhuber, C, Ivy-ochs, S, Maden, C, Fülöp, R, Fink, D, Wilcken, K M, Fujioka, T, Fabel, D, Freeman, S P H T, Xu, S, Fifield, L K, Akçar, N, Spiegel, C & Dunai, T J 2019, ' Preliminary results of CoQtz-N: A quartz reference material for terrestrial in-situ cosmogenic 10Be and 26Al measurements ', Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms . https://doi.org/10.1016/j.nimb.2019.04.073

There is growing interest in geochronological applications of terrestrial in situ-produced cosmogenic nuclides, with the most commonly measured being 10Be and 26Al in quartz. To extract and then separate these radionuclides from quartz and prepare th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7422e7bc7e559a9ac67c98c960818752
https://gfzpublic.gfz-potsdam.de/pubman/item/item_4444888

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Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic 10 Be

Autor: Colleen L. Linari, Stewart P.H.T. Freeman, Robert C. Finkel, Eric W. Portenga, Milan J. Pavich, Paul R. Bierman

Publikováno v: Earth Surface Processes and Landforms. 42:928-940

The Blue Ridge escarpment, located within the southern Appalachian Mountains of Virginia and North Carolina, forms a distinct, steep boundary between the lower-elevation Piedmont and higher-elevation Blue Ridge physiographic provinces. To understand

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2f4c7d1be2cba2831153e150b05daf1
https://doi.org/10.1002/esp.4051

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Informing Conservation: Towards 14C Wiggle-Matching of Short Tree-Ring Sequences from Medieval Buildings in England

Autor: Alex Bayliss, Seren Griffiths, Cathy Tyers, P. Marshall, Stewart P.H.T. Freeman, C. Bronk Ramsey, Gordon Cook

Publikováno v: Radiocarbon. 59:985-1007

This study tested whether accurate dating by accelerator mass spectrometry (AMS) radiocarbon wiggle-matching of short tree-ring series (~30 annual rings) in the Medieval period could be achieved. Scientific dating plays a central role in the conserva

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b426352dfc24273be26c8bf65e13d1c7
https://doi.org/10.1017/rdc.2016.61

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