Dataset: Fe - Surface

SOIREE Surface Fe Data

Comments preserved from the original file:
SOIREE Surface Fe underway data

Author: Andrew R. Bowie (University of Plymouth and Plymouth Marine Laboratory)
Dept. of Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom
Tel. +44 1752 233128, Fax +44 1752 233035, E-mail abowie@plymouth.ac.uk

SOIREE Fe data used in the preparation of the manuscript:
Bowie et al. (2001), The Fate of Added Iron during a Mesoscale Fertilisation Experiment in the Southern Ocean

This data was prepared by Andrew Bowie, whom the ownership rests with.
The data is for use for SOIREE participants only for research purposes.
Before using this data in any presentation or printed publication, please
contact the author and include full acknowledgements. All enquiries regarding
the sampling, analysis and data preparation can be directed to the address above.

Notes
1. Dissolved iron (DFe) underway data (nM).
2. All surface Fe analyses were performed using a flow injection - chemiluminescence (FI-CL) technique based on the luminol reaction using dissolved oxygen as the oxidant (Bowie et al., 1998).
3. All underway samples taken torpedo fish towed at 0.5-1 m below the surface.
4. The detection limit of the FI-CL method was 0.04 nM.
5. The analytical blank varied between 0.09 and 0.24 nM over 13 d with a mean standard deviation of 0.013 nM.
6. Contamination (suspected to be from the ship itself) resulted in a practical limit of detection for the underway mapping of 0.10-0.20 nM, which was monitored daily.
7. Out-of-patch locations determined by absence of SF6 signal. Nevertheless, continuous tracking between high Fe within patch and almost two orders lower Fe out of patch may lead to memory effect contamination of the low values for out of patch. Therefore rejections of 61 suspect out of patch "contaminated" samples
8. A '<' symbol indicates that the concentration was below the practical limit of detection.
9. The timing of samples collected from the underway system were adjusted for lag time delays due to surface water pumping and analysis (4.0-6.5 min).
10. Decimal time is given as days in February 1999 (GMT), with 1 February 1999 0:00 = 1.0000.
11. Latitudes and longitudes are taken from the DAS on RV Tangaroa (no Lagrangian correction).
12. Each worksheet corresponds to one mapping session.

References:
Bowie, A.R., Achterberg, E.P., Mantoura, R.F.C., Worsfold, P.J., 1998.
Determination of sub-nanomolar levels of iron in seawater using flow injection
with chemiluminescence detection. Analytica Chimica Acta 361, 189-200.

Bowie, A.R., Maldonado, M.T., Frew, R.D., Croot P.L., Achterberg, E.A., Mantoura,
R.F.C., Worsfold, P.J., Law, C.S., Boyd P.W., The Fate of Added Iron during a
Mesoscale Fertilisation Experiment in the Southern Ocean, Deep-Sea Research II (2001),
SOIREE special issue, in the press.

Note
Values in brackets ('[ ]') were suspected to be contaminated

Data from original Pre-release Site Survey Notes columns below

			
date		time	Notes
19990208	0021	Ship moving slowly
19990208	0202	nd
19990208	0330	nd
19990208	0414	nd
19990208	0500	Ship moving slowly
19990208	0530	nd
19990208	0907	nd
19990208	0955	nd
19990208	1000	nd
19990209	1235	Below LOD
19990209	1243	Below LOD
19990209	1308	nd			
			
Mean		0.08		
Std. Dev.	0.03		
n		10		
2 		rejections