Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current

We present the first transect of dissolved 10Be depth profiles across the Antarctic Circumpolar Current (ACC) in the Atlantic sector. North of the Polar Front the 10Be concentrations increase continuously from very low values at the surface to values of up to 1600 atoms/g at depth. Deep water 10Be c...

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Main Authors: M. Frank A B, Peter W. Kubik D, Augusto Mangini B
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2002
Subjects:
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.6811
http://www.geomar.de/fileadmin/personal/fb1/p-oz/mfrank/Frank_et_al_2002_Be.pdf
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spelling ftciteseerx:oai:CiteSeerX.psu:10.1.1.501.6811 2023-05-15T13:47:29+02:00 Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current M. Frank A B Peter W. Kubik D Augusto Mangini B The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.6811 http://www.geomar.de/fileadmin/personal/fb1/p-oz/mfrank/Frank_et_al_2002_Be.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.6811 http://www.geomar.de/fileadmin/personal/fb1/p-oz/mfrank/Frank_et_al_2002_Be.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geomar.de/fileadmin/personal/fb1/p-oz/mfrank/Frank_et_al_2002_Be.pdf text 2002 ftciteseerx 2016-01-08T09:10:02Z We present the first transect of dissolved 10Be depth profiles across the Antarctic Circumpolar Current (ACC) in the Atlantic sector. North of the Polar Front the 10Be concentrations increase continuously from very low values at the surface to values of up to 1600 atoms/g at depth. Deep water 10Be concentrations of particular water masses are consistent with earlier results obtained further north. South of the Polar Front and in the Weddell Sea the distribution of 10Be is also characterised by low surface concentrations but below 1000 m depth the concentrations are relatively constant and significantly higher (up to 2000 atoms/g) than further north, probably as a result of mixing and advection of water masses of Pacific origin. Overall the deep water 10Be distribution is obviously not significantly affected by scavenging processes or ice melt and comparison with the density distribution suggests that 10Be can be viewed as a quasi-conservative tracer. This provides a tool for an improved understanding of the behaviour of other more particle reactive trace metals in the Southern Ocean such as 230Th: in deep waters north of the ACC/Weddell Gyre boundary (AWB) 10Be/230Th has a relatively constant value (1.7 9 0.3U109 atoms/dpm) over a wide density range whereas south of the AWB the ratio is significantly lower (1.1 9 0.2U109 atoms/dpm). This normalisation to 10Be corroborates that 230Th is enriched by 50 % due to accumulation south of the AWB as a consequence of minimal particulate fluxes. The quasi-conservative behaviour deduced from our results also implies that 10Be can only be used Text Antarc* Antarctic Southern Ocean Weddell Sea Unknown Antarctic Pacific Southern Ocean The Antarctic Weddell Weddell Sea
institution Open Polar
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language English
description We present the first transect of dissolved 10Be depth profiles across the Antarctic Circumpolar Current (ACC) in the Atlantic sector. North of the Polar Front the 10Be concentrations increase continuously from very low values at the surface to values of up to 1600 atoms/g at depth. Deep water 10Be concentrations of particular water masses are consistent with earlier results obtained further north. South of the Polar Front and in the Weddell Sea the distribution of 10Be is also characterised by low surface concentrations but below 1000 m depth the concentrations are relatively constant and significantly higher (up to 2000 atoms/g) than further north, probably as a result of mixing and advection of water masses of Pacific origin. Overall the deep water 10Be distribution is obviously not significantly affected by scavenging processes or ice melt and comparison with the density distribution suggests that 10Be can be viewed as a quasi-conservative tracer. This provides a tool for an improved understanding of the behaviour of other more particle reactive trace metals in the Southern Ocean such as 230Th: in deep waters north of the ACC/Weddell Gyre boundary (AWB) 10Be/230Th has a relatively constant value (1.7 9 0.3U109 atoms/dpm) over a wide density range whereas south of the AWB the ratio is significantly lower (1.1 9 0.2U109 atoms/dpm). This normalisation to 10Be corroborates that 230Th is enriched by 50 % due to accumulation south of the AWB as a consequence of minimal particulate fluxes. The quasi-conservative behaviour deduced from our results also implies that 10Be can only be used
author2 The Pennsylvania State University CiteSeerX Archives
format Text
author M. Frank A B
Peter W. Kubik D
Augusto Mangini B
spellingShingle M. Frank A B
Peter W. Kubik D
Augusto Mangini B
Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current
author_facet M. Frank A B
Peter W. Kubik D
Augusto Mangini B
author_sort M. Frank A B
title Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current
title_short Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current
title_full Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current
title_fullStr Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current
title_full_unstemmed Quasi-conservative behaviour of 10Be in deep waters of the Weddell Sea and the Atlantic sector of the Antarctic Circumpolar Current
title_sort quasi-conservative behaviour of 10be in deep waters of the weddell sea and the atlantic sector of the antarctic circumpolar current
publishDate 2002
url http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.6811
http://www.geomar.de/fileadmin/personal/fb1/p-oz/mfrank/Frank_et_al_2002_Be.pdf
geographic Antarctic
Pacific
Southern Ocean
The Antarctic
Weddell
Weddell Sea
geographic_facet Antarctic
Pacific
Southern Ocean
The Antarctic
Weddell
Weddell Sea
genre Antarc*
Antarctic
Southern Ocean
Weddell Sea
genre_facet Antarc*
Antarctic
Southern Ocean
Weddell Sea
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op_relation http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.501.6811
http://www.geomar.de/fileadmin/personal/fb1/p-oz/mfrank/Frank_et_al_2002_Be.pdf
op_rights Metadata may be used without restrictions as long as the oai identifier remains attached to it.
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