Details
Originalsprache | Englisch |
---|---|
Seiten (von - bis) | 127-134 |
Seitenumfang | 8 |
Fachzeitschrift | Earth and Planetary Science Letters |
Jahrgang | 440 |
Frühes Online-Datum | 23 Feb. 2016 |
Publikationsstatus | Veröffentlicht - 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
- Erdkunde und Planetologie (insg.)
- Geophysik
- Erdkunde und Planetologie (insg.)
- Geochemie und Petrologie
- Erdkunde und Planetologie (insg.)
- Erdkunde und Planetologie (sonstige)
- Erdkunde und Planetologie (insg.)
- Astronomie und Planetologie
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Earth and Planetary Science Letters, Jahrgang 440, 15.04.2016, S. 127-134.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
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.
KW - I
KW - U
KW - Arctic Ocean
KW - GEOTRACES
KW - Tracers
UR - http://www.scopus.com/inward/record.url?scp=84960502569&partnerID=8YFLogxK
U2 - 10.1016/j.epsl.2016.02.020
DO - 10.1016/j.epsl.2016.02.020
M3 - Article
AN - SCOPUS:84960502569
VL - 440
SP - 127
EP - 134
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
SN - 0012-821X
ER -