Articles | Volume 15, issue 23
https://doi.org/10.5194/bg-15-7299-2018
https://doi.org/10.5194/bg-15-7299-2018
Research article
 | 
10 Dec 2018
Research article |  | 10 Dec 2018

Evolution of 231Pa and 230Th in overflow waters of the North Atlantic

Feifei Deng, Gideon M. Henderson, Maxi Castrillejo, Fiz F. Perez, and Reiner Steinfeldt

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Cited articles

Anderson, R. F., Bacon, M. P. and Brewer, P. G.: Removal of 230Th and 231Pa at ocean margins, Earth Planet. Sc. Lett., 66, 73–90, https://doi.org/10.1016/0012-821X(83)90127-9, 1983a. 
Anderson, R. F., Bacon, M. P. and Brewer, P. G.: Removal of 230Th and 231Pa from the open ocean, Earth Planet. Sc. Lett., 62, 7–23, https://doi.org/10.1016/0012-821X(83)90067-5, 1983b. 
Anderson, R. F., Fleisher, M. Q., Biscaye, P. E., Kumar, N., Dittrich, B., Kubik, P., and Suter, M.: Anomalous boundary scavenging in the Middle Atlantic Bight: evidence from 230Th, 231Pa, 10Be and 210Pb, Deep-Sea Res. Pt. II, 41, 537–561, https://doi.org/10.1016/0967-0645(94)90034-5, 1994. 
Anderson, R. F., Fleisher, M. Q., Robinson, L. F., Edwards, R. L., Hoff, J. A., Moran, S. B., Rutgers van der Loeff, M. R., Thomas, A. L., Roy-Barman, M., and Francois, R.: GEOTRACES intercalibration of 230Th, 232Th, 231Pa, and prospects: For 10Be, Limnol. Oceanogr.-Meth., 10, 179–213, https://doi.org/10.4319/lom.2012.10.179, 2012. 
Bacon, M. P. and Anderson, R. F.: Distribution of thorium isotopes between dissolved and particulate forms in the deep sea, J. Geophys. Res., 87, 2045, https://doi.org/10.1029/JC087iC03p02045, 1982. 
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To better use Pa / Th to reconstruct deep water ventilation rate, we assessed controls on 230Th and 231Pa in the northern North Atlantic. With extended optimum multi-parameter analysis and CFC-based water-mass age, we found the imprint of young overflow water on Th and Pa and enhanced scavenging near the seafloor. A significantly higher advective loss of Pa to the south relative to Th in the Atlantic was estimated, supporting the use of Pa / Th for assessing basin-scale meridional transport.
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