Instrument: Trace Metal Pump - Towed

Instrument Short Name: GeoFish
(http://vocab.nerc.ac.uk/collection/L05/current/31/)
Instrument Description:

The GeoFish towed sampler is a custom designed near surface (<2m) sampling system for the collection of trace metal clean seawater. It consists of a PVC encapsulated lead weighted torpedo and separate PVC depressor vane supporting the intake utilizing all PFA Teflon tubing connected to a deck mounted, air-driven, PFA Teflon dual-diaphragm pump which provides trace-metal clean seawater at up to 3.7L/min. The GeoFish is towed at up to 13kts off to the side of the vessel outside of the ship's wake to avoid possible contamination from the ship's hull. It was developed by Geoffrey Smith and Ken Bruland (University of California, Santa Cruz).

PI supplied instrument name: UCSC designed "GeoFish" towed sampling system
Dataset-specific description

Surface seawater samples were collected from ~2-5 meters depth outside of ship's influence using the UCSC designed "GeoFish" towed sampling system.

All surface samples were filtered and then homogenized in one or two of the 500 L SAFe tanks

GeoFish/SAFe tank system consists of PFA TeflonTM tubing, an all PFA TeflonTM diaphragm pump, sequential filtration through 0.45 µm then 0.2 µm pore size polycarbonate, track etched (PCTE) pleated filter cartridges and two 500 L fluorinated low density polyethylene tanks connected with all TeflonTM tubing, valves and fittings. All filtrations, acidifications and bottling of the SAFe and GEOTRACES samples were performed inside of Class-100 clean benches in a portable clean van.