Actinium-227 as a tracer for diapycnal mixing and deep upwelling
227Ac is a naturally occuring radioactive tracer (half-life 21.8 years) that is continuously released into the overlying water by deep-sea sediments. Since the pioneering work of Nozaki (1984), it has been recognizedthat 227Ac in excess of its progenitor231Pa (227Acex) has a huge potential as a trac...
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ftawi:oai:epic.awi.de:9102 2023-09-05T13:23:30+02:00 Actinium-227 as a tracer for diapycnal mixing and deep upwelling Geibert, W. Usbeck, Regina Rutgers v. d. Loeff, Michiel 2003 application/pdf https://epic.awi.de/id/eprint/9102/ https://epic.awi.de/id/eprint/9102/1/Gei2003e.pdf https://hdl.handle.net/10013/epic.19618 https://hdl.handle.net/10013/epic.19618.d001 unknown https://epic.awi.de/id/eprint/9102/1/Gei2003e.pdf https://hdl.handle.net/10013/epic.19618.d001 Geibert, W. orcid:0000-0001-8646-2334 , Usbeck, R. and Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 (2003) Actinium-227 as a tracer for diapycnal mixing and deep upwelling , Keynote Lecture, 13th Annual Goldschmidt Conference, Kurashiki, Japan, Sept. 7-12 . hdl:10013/epic.19618 EPIC3Keynote Lecture, 13th Annual Goldschmidt Conference, Kurashiki, Japan, Sept. 7-12, 2003 p. Conference notRev 2003 ftawi 2023-08-22T19:47:51Z 227Ac is a naturally occuring radioactive tracer (half-life 21.8 years) that is continuously released into the overlying water by deep-sea sediments. Since the pioneering work of Nozaki (1984), it has been recognizedthat 227Ac in excess of its progenitor231Pa (227Acex) has a huge potential as a tracer for diapycnal mixing in the deep sea. However, data on the distribution of 227Ac are still scarce due to the difficult sampling and measurement.Recently, some additional information on the global distribution of227Ac has become available (Geibert et al. 2002), confirming the results of Nozaki, and adding new insights to the role of deep upwelling for its distribution in the Southern Ocean. There, 227Acex has been shown to bedetectable throughout the water column up to the sea surface as a consequence of intense and rapid verticalexchange of water masses.Here, we give an overview about the distribution of 227Ac in the ocean, including new results from inversemodelling. The obtained maps of the modelled global distribution of227Acex confirm that this tracer closelyreflects the underlying patterns of circulation and mixing.Additionally, we give an introduction to the available measurement techniques (different a-spectrometric techniques, delayed coincidence counting of its daughter nuclides), and present the potential applications of 227Ac inthe near future. Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Southern Ocean |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
227Ac is a naturally occuring radioactive tracer (half-life 21.8 years) that is continuously released into the overlying water by deep-sea sediments. Since the pioneering work of Nozaki (1984), it has been recognizedthat 227Ac in excess of its progenitor231Pa (227Acex) has a huge potential as a tracer for diapycnal mixing in the deep sea. However, data on the distribution of 227Ac are still scarce due to the difficult sampling and measurement.Recently, some additional information on the global distribution of227Ac has become available (Geibert et al. 2002), confirming the results of Nozaki, and adding new insights to the role of deep upwelling for its distribution in the Southern Ocean. There, 227Acex has been shown to bedetectable throughout the water column up to the sea surface as a consequence of intense and rapid verticalexchange of water masses.Here, we give an overview about the distribution of 227Ac in the ocean, including new results from inversemodelling. The obtained maps of the modelled global distribution of227Acex confirm that this tracer closelyreflects the underlying patterns of circulation and mixing.Additionally, we give an introduction to the available measurement techniques (different a-spectrometric techniques, delayed coincidence counting of its daughter nuclides), and present the potential applications of 227Ac inthe near future. |
format |
Conference Object |
author |
Geibert, W. Usbeck, Regina Rutgers v. d. Loeff, Michiel |
spellingShingle |
Geibert, W. Usbeck, Regina Rutgers v. d. Loeff, Michiel Actinium-227 as a tracer for diapycnal mixing and deep upwelling |
author_facet |
Geibert, W. Usbeck, Regina Rutgers v. d. Loeff, Michiel |
author_sort |
Geibert, W. |
title |
Actinium-227 as a tracer for diapycnal mixing and deep upwelling |
title_short |
Actinium-227 as a tracer for diapycnal mixing and deep upwelling |
title_full |
Actinium-227 as a tracer for diapycnal mixing and deep upwelling |
title_fullStr |
Actinium-227 as a tracer for diapycnal mixing and deep upwelling |
title_full_unstemmed |
Actinium-227 as a tracer for diapycnal mixing and deep upwelling |
title_sort |
actinium-227 as a tracer for diapycnal mixing and deep upwelling |
publishDate |
2003 |
url |
https://epic.awi.de/id/eprint/9102/ https://epic.awi.de/id/eprint/9102/1/Gei2003e.pdf https://hdl.handle.net/10013/epic.19618 https://hdl.handle.net/10013/epic.19618.d001 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3Keynote Lecture, 13th Annual Goldschmidt Conference, Kurashiki, Japan, Sept. 7-12, 2003 p. |
op_relation |
https://epic.awi.de/id/eprint/9102/1/Gei2003e.pdf https://hdl.handle.net/10013/epic.19618.d001 Geibert, W. orcid:0000-0001-8646-2334 , Usbeck, R. and Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 (2003) Actinium-227 as a tracer for diapycnal mixing and deep upwelling , Keynote Lecture, 13th Annual Goldschmidt Conference, Kurashiki, Japan, Sept. 7-12 . hdl:10013/epic.19618 |
_version_ |
1776204093158588416 |