Sampling Plans

Chlorophylls

Size Fractionated Chlorophyll Methodology (.pdf) (Twiss)

Chlorophyll Log Sheets (.doc)

Sediment Traps

Measurements

• Hawley: mass flux
• Nalepa: OC & nutrient fluxes (food for benthos)
• Carrick: plankton & microbial composition
• Paytan: OC&N isotopes (quantitative C&N are redundant with Nalepa); probably get them as part of the isotope analysis. We need to discuss carbonate removal procedure.

All of the trap samples will be dried and weighed to determine the mass, except for the paired traps at stations 7 and 13 (1 and 10m) which are for Carrick and Nalepa. For the duplicate traps, one will be poisoned with CHCl3, the other with HgCl2 (plankton counts)

Stations

distance measured from bottom, bottles spiked w/chloroform unless otherwise noted)

• Station 7: - depth 24 m, middle of central basin (north of Cleveland), will go hypoxic - 2 traps at 1 m (one spiked with HgCl2, one with CHCl3), 2 traps at 10 m (one spiked with HgCl2, one with CHCl3)
• Station 13: depth 21 m, eastern end of central basin (north of Ashtabula), will probably not go hypoxic - 2 traps at 1 m, 2 at 10 m
• Station 12: eastern basin, 55 m - traps at 1, 10, 30m
• Stations 4 and 5: passages between western and central basins - 1 trap at 1 m