First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • N. Casacuberta
  • P. Masqué
  • G. Henderson
  • M. Rutgers van-der-Loeff
  • D. Bauch
  • Christof Vockenhuber
  • Abdelouahed Daraoui
  • Clemens Walther
  • Hans Arno Synal
  • Marcus Christl

Externe Organisationen

  • ETH Zürich
  • Universidad Autónoma de Barcelona (UAB)
  • University of Western Australia
  • Edith Cowan University
  • University of Oxford
  • Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
  • GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)127-134
Seitenumfang8
FachzeitschriftEarth and Planetary Science Letters
Jahrgang440
Frühes Online-Datum23 Feb. 2016
PublikationsstatusVeröffentlicht - 15 Apr. 2016

Abstract

The first dataset of 236U/238U in the water column of the Arctic Ocean (AO) is presented and shows the widest range of ratios reported so far in the open ocean, from (5±5) to (3840±260)×10-12. Surface samples and depth profiles were collected during two GEOTRACES expeditions in 2011-2012 and analyzed for the concentrations of 236U and 129I, with the aim of investigating whether the combination of 236U/238U and 129I/236U can be used as a new oceanographic tool in the AO. Results show that the distributions of the 236U/238U and 129I/236U atomic ratios are consistent with the different water masses in the AO. High 236U/238U and 129I/236U ratios in the upper water column (>2000×10-12 and >200, respectively) illustrate the penetration of Atlantic waters (AW) into the AO. Lower values were found in Pacific waters (PW) and deep waters of the AO. Rivers seem to represent a temporally and spatially-constrained third anthropogenic source of 236U but more data are needed to confirm this. In a simple mixing model, the combination of 236U/238U and 129I/236U reveals a high contribution (>99%) of natural background waters (pre-nuclear era) in the deep and bottom waters of the Amerasian basin, indicating an apparent water mass renewal time of >1000 years. Despite the relatively high apparent age of the Amerasian Basin deep waters, this work shows the potential of using the dual-tracer approach as a new oceanographic tool in the Arctic Ocean.

ASJC Scopus Sachgebiete

Zitieren

First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer. / Casacuberta, N.; Masqué, P.; Henderson, G. et al.
in: Earth and Planetary Science Letters, Jahrgang 440, 15.04.2016, S. 127-134.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Casacuberta, N, Masqué, P, Henderson, G, Rutgers van-der-Loeff, M, Bauch, D, Vockenhuber, C, Daraoui, A, Walther, C, Synal, HA & Christl, M 2016, 'First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer', Earth and Planetary Science Letters, Jg. 440, S. 127-134. https://doi.org/10.1016/j.epsl.2016.02.020
Casacuberta, N., Masqué, P., Henderson, G., Rutgers van-der-Loeff, M., Bauch, D., Vockenhuber, C., Daraoui, A., Walther, C., Synal, H. A., & Christl, M. (2016). First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer. Earth and Planetary Science Letters, 440, 127-134. https://doi.org/10.1016/j.epsl.2016.02.020
Casacuberta N, Masqué P, Henderson G, Rutgers van-der-Loeff M, Bauch D, Vockenhuber C et al. First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer. Earth and Planetary Science Letters. 2016 Apr 15;440:127-134. Epub 2016 Feb 23. doi: 10.1016/j.epsl.2016.02.020
Casacuberta, N. ; Masqué, P. ; Henderson, G. et al. / First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer. in: Earth and Planetary Science Letters. 2016 ; Jahrgang 440. S. 127-134.
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title = "First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer",
abstract = "The first dataset of 236U/238U in the water column of the Arctic Ocean (AO) is presented and shows the widest range of ratios reported so far in the open ocean, from (5±5) to (3840±260)×10-12. Surface samples and depth profiles were collected during two GEOTRACES expeditions in 2011-2012 and analyzed for the concentrations of 236U and 129I, with the aim of investigating whether the combination of 236U/238U and 129I/236U can be used as a new oceanographic tool in the AO. Results show that the distributions of the 236U/238U and 129I/236U atomic ratios are consistent with the different water masses in the AO. High 236U/238U and 129I/236U ratios in the upper water column (>2000×10-12 and >200, respectively) illustrate the penetration of Atlantic waters (AW) into the AO. Lower values were found in Pacific waters (PW) and deep waters of the AO. Rivers seem to represent a temporally and spatially-constrained third anthropogenic source of 236U but more data are needed to confirm this. In a simple mixing model, the combination of 236U/238U and 129I/236U reveals a high contribution (>99%) of natural background waters (pre-nuclear era) in the deep and bottom waters of the Amerasian basin, indicating an apparent water mass renewal time of >1000 years. Despite the relatively high apparent age of the Amerasian Basin deep waters, this work shows the potential of using the dual-tracer approach as a new oceanographic tool in the Arctic Ocean.",
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note = "Funding information: The authors acknowledge the chief scientists, colleagues, captain and crew members involved in sampling activities during the two expeditions of the Polarstern, in 2011/2012, and Anton Vaks for the Lena River sampling in 2014. NC research was supported by the ETH Z{\"u}rich Postdoctoral Fellowship Program and currently by the Swiss National Science Foundation (AMBIZIONE PZ00P2_154805 ). PM was supported in part by a Gledden Visiting Fellowship awarded by the Institute of Advanced Studies at The University of Western Australia and by the Generalitat de Catalunya through MERS ( 2014 SGR 1356 ). DB acknowledges funding by the German Research Funding Agency DFG (project BA1689 ). The ETH Zurich Laboratory of Ion Beam Physics is partially funded by its consortium partners EAWAG , EMPA , and PSI .",
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TY - JOUR

T1 - First 236U data from the Arctic Ocean and use of 236U/238U and 129I/236U as a new dual tracer

AU - Casacuberta, N.

AU - Masqué, P.

AU - Henderson, G.

AU - Rutgers van-der-Loeff, M.

AU - Bauch, D.

AU - Vockenhuber, Christof

AU - Daraoui, Abdelouahed

AU - Walther, Clemens

AU - Synal, Hans Arno

AU - Christl, Marcus

N1 - Funding information: The authors acknowledge the chief scientists, colleagues, captain and crew members involved in sampling activities during the two expeditions of the Polarstern, in 2011/2012, and Anton Vaks for the Lena River sampling in 2014. NC research was supported by the ETH Zürich Postdoctoral Fellowship Program and currently by the Swiss National Science Foundation (AMBIZIONE PZ00P2_154805 ). PM was supported in part by a Gledden Visiting Fellowship awarded by the Institute of Advanced Studies at The University of Western Australia and by the Generalitat de Catalunya through MERS ( 2014 SGR 1356 ). DB acknowledges funding by the German Research Funding Agency DFG (project BA1689 ). The ETH Zurich Laboratory of Ion Beam Physics is partially funded by its consortium partners EAWAG , EMPA , and PSI .

PY - 2016/4/15

Y1 - 2016/4/15

N2 - The first dataset of 236U/238U in the water column of the Arctic Ocean (AO) is presented and shows the widest range of ratios reported so far in the open ocean, from (5±5) to (3840±260)×10-12. Surface samples and depth profiles were collected during two GEOTRACES expeditions in 2011-2012 and analyzed for the concentrations of 236U and 129I, with the aim of investigating whether the combination of 236U/238U and 129I/236U can be used as a new oceanographic tool in the AO. Results show that the distributions of the 236U/238U and 129I/236U atomic ratios are consistent with the different water masses in the AO. High 236U/238U and 129I/236U ratios in the upper water column (>2000×10-12 and >200, respectively) illustrate the penetration of Atlantic waters (AW) into the AO. Lower values were found in Pacific waters (PW) and deep waters of the AO. Rivers seem to represent a temporally and spatially-constrained third anthropogenic source of 236U but more data are needed to confirm this. In a simple mixing model, the combination of 236U/238U and 129I/236U reveals a high contribution (>99%) of natural background waters (pre-nuclear era) in the deep and bottom waters of the Amerasian basin, indicating an apparent water mass renewal time of >1000 years. Despite the relatively high apparent age of the Amerasian Basin deep waters, this work shows the potential of using the dual-tracer approach as a new oceanographic tool in the Arctic Ocean.

AB - The first dataset of 236U/238U in the water column of the Arctic Ocean (AO) is presented and shows the widest range of ratios reported so far in the open ocean, from (5±5) to (3840±260)×10-12. Surface samples and depth profiles were collected during two GEOTRACES expeditions in 2011-2012 and analyzed for the concentrations of 236U and 129I, with the aim of investigating whether the combination of 236U/238U and 129I/236U can be used as a new oceanographic tool in the AO. Results show that the distributions of the 236U/238U and 129I/236U atomic ratios are consistent with the different water masses in the AO. High 236U/238U and 129I/236U ratios in the upper water column (>2000×10-12 and >200, respectively) illustrate the penetration of Atlantic waters (AW) into the AO. Lower values were found in Pacific waters (PW) and deep waters of the AO. Rivers seem to represent a temporally and spatially-constrained third anthropogenic source of 236U but more data are needed to confirm this. In a simple mixing model, the combination of 236U/238U and 129I/236U reveals a high contribution (>99%) of natural background waters (pre-nuclear era) in the deep and bottom waters of the Amerasian basin, indicating an apparent water mass renewal time of >1000 years. Despite the relatively high apparent age of the Amerasian Basin deep waters, this work shows the potential of using the dual-tracer approach as a new oceanographic tool in the Arctic Ocean.

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