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| Titel |
Sediment 231Pa/230Th as a recorder of the rate of the Atlantic meridional overturning circulation: insights from a 2-D model |
| VerfasserIn |
Y. Luo, R. Francois, S. E. Allen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 6, no. 1 ; Nr. 6, no. 1 (2010-03-19), S.381-400 |
| Datensatznummer |
250003367
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| Publikation (Nr.) |
 copernicus.org/os-6-381-2010.pdf |
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| Zusammenfassung |
| A two dimensional scavenging model is used to investigate the patterns of
sediment 231Pa/230Th generated by the Atlantic Meridional
Overturning Circulation (AMOC) and further advance the application of this
proxy for ocean paleocirculation studies. The scavenging parameters and the
geometry of the overturning circulation cell have been chosen so that the
model generates meridional sections of dissolved 230Th and 231Pa
consistent with published water column profiles and an additional 12
previously unpublished profiles measured in the North and Equatorial
Atlantic. The processes that generate the meridional sections of dissolved
and particulate 230Th, dissolved and particulate 231Pa, dissolved
and particulate 231Pa/230Th, and sediment 231Pa/230Th
are discussed in detail. The results indicate that the relationship between
sediment 231Pa/230Th at any given site and the overturning
circulation is very complex. They clearly show that constraining past
changes in the strength and geometry of the AMOC requires an extensive data
set and they suggest strategies to maximize information from a limited
number of samples. |
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