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Trapping efficiencies of sediment traps from the deep eastern North Atlantic: the 230Th calibration

Record type: Article

Bottom-tethered sediment traps deployed in the deep eastern North Atlantic between 54°N 20°W and 33°N 20°W (L1, L2, L3), at the European continental margin at 49°N (OMEX) and off the Canary Islands (ESTOC) were investigated for the determination of 230Th trapping efficiencies. The ratios of 230Th flux measured in the traps (Fa) to the expected 230Th flux from the production rate of 230Th in the overlying water column (Fp) ranged between 0.09 and 1.26. For the traps with deployment periods >300 days the interannual variation of Fa/Fp ratios (different years but same location and water depth) were up to 10%, suggesting that the average 230Th flux to the sediment traps did not vary significantly. The influence of lateral advection on the 230Th flux was taken into account either by applying a mass balance of 230Th and 231Pa or by assuming a constant removal rate of 230Th from the water column, an assumption based on similar 230Th concentration-depth profiles observed at most locations investigated. 230Th trapping efficiencies were between 9 and 143%, showing a trend of increasing efficiencies with increasing water depth. No relation was found between current velocities and 230Th trapping efficiencies. Our investigations suggest that the observation of constant or even increasing particle flux rates with increasing water depths in several sediment trap arrays investigated may be a result of sediment trap biases. The correction for the trapping biases is important for the understanding of the regional differences in the particle flux in the eastern North Atlantic.

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Citation

Scholten, J.C., Fietzke, J., Vogler, S., Rutgers Van Der Loeff, M.M., Mangini, A., Koeve, W., Waniek, J., Stoffers, P., Antia, A. and Kuss, J. (2001) Trapping efficiencies of sediment traps from the deep eastern North Atlantic: the 230Th calibration Deep Sea Research Part II: Topical Studies in Oceanography, 48, (10), pp. 2383-2408. (doi:10.1016/S0967-0645(00)00176-4).

More information

Published date: 2001
Keywords: SEDIMENT TRAPS, OMEX, CANARY ISLAND WATERS

Identifiers

Local EPrints ID: 8014
URI: http://eprints.soton.ac.uk/id/eprint/8014
ISSN: 0967-0645
PURE UUID: 88fe871a-1e1a-4b68-ae4d-60fa1dc0207d

Catalogue record

Date deposited: 19 Aug 2004
Last modified: 17 Jul 2017 17:13

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Contributors

Author: J.C. Scholten
Author: J. Fietzke
Author: S. Vogler
Author: M.M. Rutgers Van Der Loeff
Author: A. Mangini
Author: W. Koeve
Author: J. Waniek
Author: P. Stoffers
Author: A. Antia
Author: J. Kuss

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