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Intercalibration studies of short-lived thorium-234 in the water column and marine particles

Intercalibration studies of short-lived thorium-234 in the water column and marine particles
Intercalibration studies of short-lived thorium-234 in the water column and marine particles
Intercomparision of 234Th measurements in both water and particulate samples was carried out between 15 laboratories worldwide, as a part of GEOTRACES inter-calibration program. Particulate samples from four different stations namely BATS (both shallow and deep) and shelf station (shallow) in Atlantic and SAFE (both shallow and deep) and Santa Barbara station (shallow) in Pacific were used in the effort. Particulate intercalibration results indicate good agreement between all the participating labs with data from all labs falling within the 95% confidence interval around the mean for most instances. Filter type experiments indicate no significant differences in 234Th activities between filter types and pore sizes (0.2–0.8 ?m). The only exception are the quartz filters, which are associated with 10% to 20% higher 234Th activities attributed to sorption of dissolved 234Th. Flow rate experiments showed a trend of decreasing 234Th activities with increasing flow rates (2-9 L min–1) for > 51 ?m size particles, indicating particle loss during the pumping process. No change in 234Th activities on small particles was observed with increasing flow-rates. 234Th intercalibration results from deep water samples at SAFe station indicate a variability of < 3% amongst labs while dissolved 234Th data from surface water at Santa Barbara Station show a less robust agreement, possibly due to the loss of 234Th from decay and large in-growth corrections as a result of long gap between sample collection and processing.
1541-5856
631-644
Maiti, Kanchan
129a3bfd-a81e-40fe-90a9-9c05adcb9fb8
Buesseler, Ken O.
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Pike, Steven M.
d4a9eb3a-af1e-4ff9-8339-0cd57f666703
Benitez-Nelson, Claudia
ddb4b000-d423-4bc4-a2b2-d25b15ce0420
Cai, Pinghe
463c703c-9a4f-4fae-bafe-faff087a9508
Chen, Weifang
99c50bcd-7758-46fe-8ac5-95aaa7229949
Cochran, Kirk
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Dai, Minhan
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Dehairs, Frank
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Gasser, Beat
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Kelly, Roger P.
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Masque, Pere
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Miller, Lisa A.
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Miguel, Juan Carlos
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Moran, Bradley
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Morris, Paul J.
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Peine, Florian
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Planchon, Frederic
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Renfro, Alisha A.
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Rutgers van der Loeff, Michiel
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Santschi, Peter H.
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Turnewitsch, Robert
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Waples, James T.
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Xu, Chen
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Maiti, Kanchan
129a3bfd-a81e-40fe-90a9-9c05adcb9fb8
Buesseler, Ken O.
8462cb4d-f7e0-4a8f-96f3-3e58f6163226
Pike, Steven M.
d4a9eb3a-af1e-4ff9-8339-0cd57f666703
Benitez-Nelson, Claudia
ddb4b000-d423-4bc4-a2b2-d25b15ce0420
Cai, Pinghe
463c703c-9a4f-4fae-bafe-faff087a9508
Chen, Weifang
99c50bcd-7758-46fe-8ac5-95aaa7229949
Cochran, Kirk
66a8f2f6-d740-414a-ac70-f30008d71c45
Dai, Minhan
45b39f60-fc8a-47cf-9318-258374f389fc
Dehairs, Frank
b18f8cce-9c05-42b7-967a-401a30f89e44
Gasser, Beat
274fa5cc-36a3-4ec8-a282-8eb2699bbef9
Kelly, Roger P.
4a25ceae-6b30-4e8b-8122-38bc687761a4
Masque, Pere
b8cd25a1-6622-4443-813c-4c851f030e49
Miller, Lisa A.
6b516603-a109-48e2-bc4b-2d60d57d3540
Miguel, Juan Carlos
9f50f8c0-a18e-4a4c-b71d-90c1040eca17
Moran, Bradley
30e33dc9-c484-47e4-84d8-7db649e9d752
Morris, Paul J.
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Peine, Florian
d8b9873d-9fd6-450f-a037-207f5dc8dbc2
Planchon, Frederic
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Renfro, Alisha A.
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Rutgers van der Loeff, Michiel
ab60e44f-fcd8-489e-8bf3-856571d5b414
Santschi, Peter H.
5bfd4eb5-5c99-4139-8f68-e0c60eac50ff
Turnewitsch, Robert
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Waples, James T.
c1c80d1d-5bf7-4a75-889c-4fe8885495f0
Xu, Chen
b53e92d4-e474-420b-a662-4af9a1c8750b

Maiti, Kanchan, Buesseler, Ken O., Pike, Steven M., Benitez-Nelson, Claudia, Cai, Pinghe, Chen, Weifang, Cochran, Kirk, Dai, Minhan, Dehairs, Frank, Gasser, Beat, Kelly, Roger P., Masque, Pere, Miller, Lisa A., Miguel, Juan Carlos, Moran, Bradley, Morris, Paul J., Peine, Florian, Planchon, Frederic, Renfro, Alisha A., Rutgers van der Loeff, Michiel, Santschi, Peter H., Turnewitsch, Robert, Waples, James T. and Xu, Chen (2012) Intercalibration studies of short-lived thorium-234 in the water column and marine particles. Limnology and Oceanography: Methods, 10, 631-644. (doi:10.4319/lom.2012.10.631).

Record type: Article

Abstract

Intercomparision of 234Th measurements in both water and particulate samples was carried out between 15 laboratories worldwide, as a part of GEOTRACES inter-calibration program. Particulate samples from four different stations namely BATS (both shallow and deep) and shelf station (shallow) in Atlantic and SAFE (both shallow and deep) and Santa Barbara station (shallow) in Pacific were used in the effort. Particulate intercalibration results indicate good agreement between all the participating labs with data from all labs falling within the 95% confidence interval around the mean for most instances. Filter type experiments indicate no significant differences in 234Th activities between filter types and pore sizes (0.2–0.8 ?m). The only exception are the quartz filters, which are associated with 10% to 20% higher 234Th activities attributed to sorption of dissolved 234Th. Flow rate experiments showed a trend of decreasing 234Th activities with increasing flow rates (2-9 L min–1) for > 51 ?m size particles, indicating particle loss during the pumping process. No change in 234Th activities on small particles was observed with increasing flow-rates. 234Th intercalibration results from deep water samples at SAFe station indicate a variability of < 3% amongst labs while dissolved 234Th data from surface water at Santa Barbara Station show a less robust agreement, possibly due to the loss of 234Th from decay and large in-growth corrections as a result of long gap between sample collection and processing.

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More information

Published date: 2012
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 347091
URI: http://eprints.soton.ac.uk/id/eprint/347091
ISSN: 1541-5856
PURE UUID: 39a12f1e-f389-4db0-8b98-4fdaaabf57d3

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Date deposited: 16 Jan 2013 10:56
Last modified: 08 Jan 2022 15:01

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Contributors

Author: Kanchan Maiti
Author: Ken O. Buesseler
Author: Steven M. Pike
Author: Claudia Benitez-Nelson
Author: Pinghe Cai
Author: Weifang Chen
Author: Kirk Cochran
Author: Minhan Dai
Author: Frank Dehairs
Author: Beat Gasser
Author: Roger P. Kelly
Author: Pere Masque
Author: Lisa A. Miller
Author: Juan Carlos Miguel
Author: Bradley Moran
Author: Paul J. Morris
Author: Florian Peine
Author: Frederic Planchon
Author: Alisha A. Renfro
Author: Michiel Rutgers van der Loeff
Author: Peter H. Santschi
Author: Robert Turnewitsch
Author: James T. Waples
Author: Chen Xu

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