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Cruise Info
| Cruise ID | SP1215 |
| Vessel | R/V ROBERT GORDON SPROUL |
| Title | Dissolved organic carbon (DOC) transformations in deep sub-surface sediments and its role as a source of "old" DOC to the water column |
| Abstract | We propose to collect sediment cores from two locations: center of the Santa Barbara Basin (SBB) and center of the Santa Monica Basin (SMB) in July 2012 (Yr-1) and July 2013 (Yr-2). At both locations, we will collect surface sediments (0-50 cm) using a multi corer. We will also collect longer cores (up to 4 m) using a gravity corer (SBB) and a piston corer (SMB). The need for a piston corer for SMB arises from the fact that there is a ~1m thick sandy turbidite at this location which will be difficult to penetrate with a gravity corer. As the cores come on deck, they will be processed (extruded, sliced, then centrifuged or squeezed) right away to collect porewater samples and solid phase samples. Most of this work will be done in a refrigerated van. Gravity cores and piston cores will first be cut into shorter segments on deck prior to further processing. Most samples will be preserved for later analyses, but a subset of them will be analyzed on ship. We will also collect surface- and bottom-water samples using a Go-Flo bottle. Key analytes are as follows: dissolved organic carbon (DOC), methane, DIC, sulfate, nutrients, some major ions; natural 14C and 13C of DOC, methane, DIC. In Yr-1, our work will focus on sampling SBB (4 days on station). We will also conduct a reconnaissance survey and sampling of SMB (2 days) to try out the piston corer at our target station. If this does not work, we will explore coring towards the NE portion of the basin. In Yr-2, our work will focus on sampling SMB (4 days on station), with 2 more days in SBB for repeat sampling as needed. |
| Starting Port | San Diego, California, USA |
| Ending Port | San Diego, California, USA |
| Starting Date | 2012-08-19 |
| Ending Date | 2012-08-28 |
| Principal Investigator | Komada, Tomoko |