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RV Kilo Moana KM1128 (GPc03, METZYME)
Cruise plan
| Cruise Info. | |
| Ship name (ship code) | RV Kilo Moana (33KB) |
| Cruise identifier | KM1128 (GPc03, METZYME) |
| Cruise period | 2011-10-01 — 2011-10-25 |
| Status | Completed |
| Port of departure | Honolulu, United States |
| Port of return | Apia, Samoa |
| Purpose | Research |
| Objectives | MetZyme project researchers will determine the role of enzymatic activity in the cycling of trace metals. Specifically the research will address the following questions: (1) degradation of sinking particulate organic material in the Tropical North Pacific can be influenced by the ability of microbes to synthesize zinc proteases, which in turn is controlled by the abundance or availability of zinc, and (2) methylation of mercury is controlled, in part, by the activity of cobalt-containing enzymes, and therefore the supply of labile cobalt to the corrinoid-containing enzymes or co-factors responsible for methylation. To attain their goal, they will collect dissolved and particulate samples for trace metals and metalloenzymes from three stations along a biogeochemical gradient in the Tropical North Pacific (along 150 degrees West from 18 degrees North to the equator). Sinking particles from metal clean sediment traps will also be obtained. The samples will also be used to carry out shipboard incubation experiments using amendments of metals, metal-chelators, B12, and proteases to examine the sensitivity and metal limitation of heterotrophic, enzymatic degradation of organic matter within the oceanic "Twilight Zone" (100-500 m). This study will result in a novel metaproteomic/metalloenzyme datasets that should provide insights into the biogeochemical cycling of metals, as well as co-limitation of primary productivity and controls on the export of carbon from the photic zone. In addition to the final data being contributed to BCO-DMO, an online metaproteomic data server will be created so the community has access to the raw data files generated by this research. |
| Chief scientist | Carl H Lamborg (Woods Hole Oceanographic Institution Department of Marine Chemistry and Geochemistry) |
| Ocean/sea areas | |
| General | North East Pacific Ocean (limit 180W) |
| Specific | Equatorial and Central Pacific, Tongan Plateau |
| Data held at BODC | |
| Discrete samples | |
| 8 CTD frame plus rosette sampler | Carotenoid and flavenoid pigment concentrations in water bodies Chlorophyll pigment concentrations in water bodies |
| 11 Stand-alone pumps | Concentration of proteins in the water column |
| 31 | Nitrite concentration parameters in the water column Carotenoid and flavenoid pigment concentrations in water bodies Dissolved oxygen parameters in the water column Phosphate concentration parameters in the water column Salinity of the water column Temperature of the water column Silicate concentration parameters in the water column Ammonium and ammonia concentration parameters in water bodies Nitrate concentration parameters in the water column Chlorophyll pigment concentrations in water bodies Dissolved metal concentrations in the water column |
