|Saito, Mak A.||Woods Hole Oceanographic Institution (WHOI)||Principal Investigator|
|Rauch, Shannon||Woods Hole Oceanographic Institution (WHOI BCO-DMO)||BCO-DMO Data Manager|
Hydrography data from Metzyme cruise (KM1128) collected using the Trace Metal Rosette (TMR).
Data were collected using the Trace Metal Rosette ((TMR), Sea-Bird SEACAT 19+).
Note that the ship's CTD package (Sea-Bird SBE 911+) was also used for sampling at some stations. See the CTD dataset for these related data.
- modified parameter names to conform with BCO-DMO naming conventions (removed spaces, replaced "/" with underscores);
- replaced blanks (missing data) with "nd";
- corrected all years of "0011" to "2011".
|Latitude||Latitude of TMR deep cast at each station; positive values = North||decimal degrees|
|Longitude||Longitude of TMR deep cast at each station; 0-360||decimal degrees|
|Type||Type of cast. T = TMR.||unitless|
|Date_Time||Date and time of TMR cast at each station; formatted as yyyy-mm-ddThh:mm:ss.sss||unitless|
|DEPTH||Sample depth||meters (m)|
|SALINITY||Salinity (PSS78)||practical salinity units (PSU)|
|Oxygen||Oxygen||micromoles per kilogram (umol/kg)|
|TbdCh||Turbidity; measured at stations 4-13. Turbidity on Upoly1 for TMR21-22 and Upoly0 for TMR23-53.||?|
|FluoroCh||Chlorophyll fluorescence; CTD deep cast stations 1-2 (Upoly0). TMR deep cast stations 4-13 -- Wetlabs ECO fluorometer on Upoly0 for TMR21-22 and Upoly1 for TMR23-53||?|
|C0mS_cm||Conductivity||milliSiemens per centimeter (mS/cm)|
|Sigma_00||Sigma theta density||?|
|ISUS||CTD cast 4 for station 1 and CTD deep cast (5) for station 2 (Upoly1) - not qc'd at all, use for relative data only!!||?|
|TMR_Cast||Trace metal rosette cast number (1-53)||unitless|
|CTD_Cast_ISUS||4 for station 1, 5 for station 2||?|
|CTD_Cast_FluoroCh_and_Xmiss||1 for station 1, 5 for station 2||?|
|Dataset-specific Instrument Name|
|Generic Instrument Name|| |
CTD Sea-Bird SBE SEACAT 19plus
|Generic Instrument Description|| |
Self contained self powered CTD profiler. Measures conductivity, temperature and pressure in both profiling (samples at 4 scans/sec) and moored (sample rates of once every 5 seconds to once every 9 hours) mode. Available in plastic or titanium housing with depth ranges of 600m and 7000m respectively. Minature submersible pump provides water to conductivity cell.
R/V Kilo Moana
|Start Date|| |
|End Date|| |
This is a MetZyme project cruise. The original cruise data are available from the NSF R2R data catalog.
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.
GEOTRACES gained momentum following a special symposium, S02: Biogeochemical cycling of trace elements and isotopes in the ocean and applications to constrain contemporary marine processes (GEOSECS II), at a 2003 Goldschmidt meeting convened in Japan. The GEOSECS II acronym referred to the Geochemical Ocean Section Studies To determine full water column distributions of selected trace elements and isotopes, including their concentration, chemical speciation, and physical form, along a sufficient number of sections in each ocean basin to establish the principal relationships between these distributions and with more traditional hydrographic parameters;
* To evaluate the sources, sinks, and internal cycling of these species and thereby characterize more completely the physical, chemical and biological processes regulating their distributions, and the sensitivity of these processes to global change; and
* To understand the processes that control the concentrations of geochemical species used for proxies of the past environment, both in the water column and in the substrates that reflect the water column.
GEOTRACES will be global in scope, consisting of ocean sections complemented by regional process studies. Sections and process studies will combine fieldwork, laboratory experiments and modelling. Beyond realizing the scientific objectives identified above, a natural outcome of this work will be to build a community of marine scientists who understand the processes regulating trace element cycles sufficiently well to exploit this knowledge reliably in future interdisciplinary studies.
Expand "Projects" below for information about and data resulting from individual US GEOTRACES research projects.