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Sediment 231Pa/230Th as a Recorder of the Rate of the Atlantic Meridional Overturning Circulation: Insights from a 2-d Model : Volume 6, Issue 3 (24/11/2009)

By Luo, Y.

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Book Id: WPLBN0004021093
Format Type: PDF Article :
File Size: Pages 75
Reproduction Date: 2015

Title: Sediment 231Pa/230Th as a Recorder of the Rate of the Atlantic Meridional Overturning Circulation: Insights from a 2-d Model : Volume 6, Issue 3 (24/11/2009)  
Author: Luo, Y.
Volume: Vol. 6, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Allen, S. E., Francois, R., & Luo, Y. (2009). Sediment 231Pa/230Th as a Recorder of the Rate of the Atlantic Meridional Overturning Circulation: Insights from a 2-d Model : Volume 6, Issue 3 (24/11/2009). Retrieved from http://worldlibrary.net/


Description
Description: Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC, V6T 1Z4, Canada. A two dimensional scavenging-circulation 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sections of dissolved 230Th and 231Pa consistent with published water column profiles and an additional 12 previously unpublished profiles measured in the North and Equatorial Atlantic.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.

Summary
Sediment 231Pa/230Th as a recorder of the rate of the Atlantic meridional overturning circulation: insights from a 2-D model

Excerpt
Chase, Z., Anderson, R. F., Fleisher, M. Q., and Kubik, P. W.: The influence of particle composition and particle flux on scavenging of Th, Pa and Be in the ocean, Earth Planet. Sci. Lett., 204, 215–219, 2002.; Chase, Z., Anderson, R. F., Fleisher, M. Q., and Kubik, P. W.: Scavenging of 230Th, 231Pa and 10Be in the Southern Ocean (SW Pacific sector): the importance of particle flux, particle composition and advection, Deep-Sea Res. II, 50, 739–768, 2003.; Clark, P. U., Pisias, N. G., Stocker, T. F., and Weaver, A. J.: The role of the thermohaline circulation in abrupt climate change, Nature, 415, 863–869, 2002.; Clegg, S. L. and Whitfield, M.: A generalized model for scavenging of trace metals in the open ocean, II. Thorium scavenging, Deep-Sea Res. A, 38, 91–120, 1991.; Clegg, S. L., Bacon, M. P., and Whitfield, M.: Application of a generalized scavenging model to thorium isotope and particle data at equatorial and high-latitude sites in the Pacific-Ocean, J. Geophys. Res.-Ocean., 96, 20655–20670, 1991.; Delanghe, D., Bard, E., and Hamelin, B.: New TIMS constraints on the uranium-238 and uranium-234 in seawaters from the main ocean basins and the Mediterranean Sea, Mar. Chem., 80, 79–93, 2002.; Francois, R.: Paleoflux and paleocirculation from sediment 230Th and 231Pa/230Th, in: Proxies in Late Cenozoic Paleoceanography, edited by: Hillaire-Marcel, C. and de Vernal, A., Elsevier, 681–716, 2007.; Francois, R., Frank, M., van der Loeff, M. M. R., and Bacon, M. P.: Th-230 normalization: An essential tool for interpreting sedimentary fluxes during the late Quaternary, Paleoceanography, 19, PA1018, doi:10.1029/2003PA000939, 2004.; Friedrichs, M. A. and Hall, M. M.: Deep circulation in the tropical North Atlantic, J. Mar. Res., 51, 697–736, 1993.; Ganachaud, A. and Wunsch, C.: Improved estimates of global ocean circulation, heat transport and mixing from hydrographic data, Nature, 408, 453–457, 2000.; Geibert, W. and Usbeck, R.: Adsorption of thorium and protactinium onto different particle types: Experimental findings, Geochim. Cosmochim. Acta, 68, 1489–1501, 2004.; Gherardi, J.-M., Labeyrie, L., Francois, R., McManus, J. F., Skinner, L. C., and Cortijo, E.: Evidence from the Northeastern Atlantic basin for variability in the rate of the meridional overturning circulation through the last deglaciation, Earth Planet. Sci. Lett., 240, 710–723, 2005.; Gherardi, J.-M., Labeyrie, L., Nave, S., Francois, R., McManus, J. F., and Cortijo, E.: Glacial-interglacial circulation changes inferred from 231Pa/230Th sedimentary record in the North Atlantic region, Paleoceanography, 24, PA2204, doi:10.1029/2008PA001696, 2009.; Guo, L. D., Chen, M., and Gueguen, C.: Control of Pa/Th ratio by particulate chemical composition in the ocean, Geophys. Res. Lett., 29, 1961, doi:10.1029/2002GL015666, 2002.; Hall, I. R., Moran, S. B., Zahn, R., Knutz, P. C., Shen, C.-C., and Edwards, R. L.: Accelerated drawdown of meridional overturning in the late-glacial Atlantic triggered by transient pre-H event freshwater perturbation, Geophys. Res. Lett., 33

 

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