Version: 03 January 2013 PI: Cutter KN204-01,A/B surface transects from tow-fish for arsenic speciation and alkaline phosphatase activity Please note that data may not be final, pending intercalibration results and further analysis. If you are interested in following changes to US GEOTRACES NAT data, there is an RSS feed available via the BCO-DMO US GEOTRACES project page.