GDAC PRE CRUISE META DATA PLATFORM Description (To Submit to the IPO Prior to Cruises s4

GDAC Pre-Cruise Metadata form Return to GDAC, BODC, National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton, SO14 3ZH E-mail: [email protected]/ [email protected]

Cruise Name: [any identifier (acronyms) 64PE411 (Baltic Fe) including technical name] Platform Name and type: RV Pelagia [vessel, mooring, satellite, towed vehicle] Project: Response of the Iron Biogeochemical Cycle on Continental Shelves to Seawater Deoxygenation (Vici project granted to C.P. Slomp by the Netherlands Organisation for Scientific Research (NWO) [associated project or program name related to funding] Lead Nation: The Netherlands Chief Scientist (Lead Scientist / Principal Investigator) contact details Name (including title): Prof. dr. C.P. Slomp Email: Phone (including country (Caroline) [email protected] code):003130-2535514 Mailing Address:

Department of Earth Sciences - Geochemistry Utrecht University PO Box 80021 3508 TA Utrecht The Netherlands

Co-Chief Scientist contact details: [GEOTRACES point of contact if different from Chief Scientist] Name (including title): Email: Phone (including country code): Mailing Address:

Cruise Details Start Port and Country: Nynashamn, Sweden Start date: May 27, 2016 End Port and Country: Texel, the Netherlands End Date: June 15, 2016 Location: [general description of study area; map/ cruise track/ coordinates if possible]

The study area is the Baltic Sea (Baltic Proper, Gulf of Finland and Southern Baltic).

Cruise Overview: [proposal abstract] This aim of this cruise is to gain insight into the mechanisms and rates of iron release from sediments in the Baltic Sea and the lateral transport of iron (and other trace metals) over the shelf to the adjacent anoxic basin. We are specifically interested in (1) the relationship of sediment iron release with changes in bottom water oxygen concentrations (2) the role of bioirrigating fauna for iron release (3) the role of Fe-CH4 interactions

Inter-calibration efforts: Please provide details of how each element will be calibrated to meet the requirements of the GEOTRACES programme e.g. use of SaFe standards, collaborative sampling, cross-over stations (latitudes and longitudes of the cross over stations, the cruise which you are crossing with and the station numbers):

We will follow the GEOTRACES guidelines for cruises without crossover stations. We will sample at least 3 depths in replicate at 2 different stations. We have arranged for another laboratory (NIOZ; dr. M. Rijkenberg and P. Laan) to carry out the analysis of replicate samples. We also will use SaFE standards and will provide an intercalibration report.

Anticipated list of parameters to be submitted to GDAC: Key parameters listed - please list any other parameters measured and the PI’s contact information. Also include information in regards to the phase i.e. dissolved or particulate and how the samples were collected. i.e. Fe (dissolved)- CTD –Bottle or Fe (dissolved) – insitu pumps Contact for each element (PI); [full name, organisation and email] if known at this stage

C.P. Slomp, Utrecht University, [email protected] Trace elements: x Fe Al Note: if the Fe analysis is successful, we plan to also measure various Zn other trace metals such as Mn, Cu, Zn etc. Mn Cd Cu Other Other Other Radioactive isotopes: 230Th 231Pa Other Other Other Other Stable isotopes: S. Severmann, Rutgers University, [email protected]  C x Other: Fe, Cr, U Radiogenic isotopes: Nd isotopes Pb isotopes Other

NON TEI data set (add as required)

Other parameters:

NH4, NO3, NO2, PO4, H4SiO4, H2S, DIC (on board) salinity temperature oxygen

Particles/Aerosols: Suspended material filtered over 0.2 um both using in-situ filtration (McClane pumps) and on deck filtering using an Ultra Clean CTD System. Analyses: total composition, Fe and U isotopes, Fe, S and P speciation of solids.

Sediment-water exchange of solutes Porewater profiles of solutes

Other relevant information to note at this stage: