| Contributors | Affiliation | Role |
|---|---|---|
| Lam, Phoebe J. | Woods Hole Oceanographic Institution (WHOI) | Principal Investigator, Contact |
| Gegg, Stephen R. | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
CTD profile data for OC449-03 Up/Down Casts
| File |
|---|
CTDprf_OC449_03.csv (Comma Separated Values (.csv), 7.94 MB) MD5:9e010a0fe5eb69d389e96e9663c65357 Primary data file for dataset ID 3469 |
| Parameter | Description | Units |
| CTD_DataSet_Id | CTD Dataset Id | text |
| date | Station date | YYYYMMDD |
| time | Station time | HHMMSS |
| lat | Station latitude (South is negative) | decimal degrees |
| lon | Station longitude (West is negative) | decimal degrees |
| timeS | Time Elapsed | seconds |
| prDM | Pressure Digiquartz | decibars |
| depSM | Depth salt water | meters |
| t090C | Temperature ITS-90 | deg C |
| t190C | Temperature 2 ITS-90 | deg C |
| sal00 | Salinity | PSU |
| sal11 | Salinity 2 | PSU |
| c0S_m | Conductivity | S/m |
| c1S_m | Conductivity 2 | S/m |
| sbeox0V | Oxygen Voltage SBE 43 | volts |
| sbeox0ML_L | Oxygen SBE 43 | ml/l |
| xmiss | Beam Transmission Chelsea/Seatech/Wetlab CStar | percentage |
| density00 | Density | Kg/m^3 |
| potemp090C | Potential Temperature ITS-90 | deg C |
| flECO_AFL | Fluorescence Wetlab ECO-AFL/FL | mg/m^3 |
| upoly0 | Upoly 0 WetLabs Turbidity | tbd |
| altM | Altimeter | meters |
| density01 | Density | Kg/m^3 |
| n2satML_L | Nitrogen Saturation | ml/l |
| oxsatML_L | Oxygen Saturation | ml/l |
| sbeox1ML_L | Oxygen SBE 43 WS 2 | ml/l |
| potemp190C | Potential Temperature ITS-90 | deg C |
| pta090C | Potential Temperature Anomaly ITS-90; a0_0; a1_0; salinity | deg C |
| sal00_0 | Salinity | PSU |
| specc | Specific Conductance | uS/cm |
| sva | Specific Volume Anomaly | 10^-8 * m^3/Kg |
| tsa | Thermosteric Anomaly | 10^-8 * m^3/Kg |
| flag | flag | nd |
| cast | cast id/number | integer |
| station | station id/number | integer |
| Dataset-specific Instrument Name | CTD Sea-Bird SBE 911plus |
| Generic Instrument Name | CTD Sea-Bird SBE 911plus |
| Generic Instrument Description | The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). The SBE 9 plus CTD can be configured with up to eight auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorescence, light (PAR), light transmission, etc.). more information from Sea-Bird Electronics |
| Website | |
| Platform | R/V Oceanus |
| Start Date | 2008-09-08 |
| End Date | 2008-09-18 |
| Description | R/V Oceanus Voyage #449, Leg III was a Coastal transect between Cape Verde and the Mauritanian coast (17N/24.5W to 20N/17.3W). The main scientific objective was to test the hypothesis that the continental margin of northwest Africa provides a significant subsurface supply of iron to the open eastern tropical Atlantic.
The planned scientific activities include CTD casts, In Situ Water Pump casts for large volume water collection, Gravity Coring, and Aerosol sampling.
Scientific personnel:
Dr. Phoebe Lam, Chief Scientist, Woods Hole Oceanographic Institution
Dr. Henrieta Dulaiova, Woods Hole Oceanographic Institution
Mr. Steven Pike, Woods Hole Oceanographic Institution
Mr. James Saenz, Woods Hole Oceanographic Institution
Dr. Aron Stubbins, Old Dominion University
Ms. Hongmei Chen, Old Dominion University
Dr. Edward Michael Perdue, Georgia Institute of Technology
Mr. Nelson Green, Georgia Institute of Technology
Mr. Péricles Silva, Instituto Nacional de Desenvolvimento das Pescas (INDP)
Dr. Anibal Medina, Instituto Nacional de Desenvolvimento das Pescas (INDP)
Mr. Alexander Dorsk, Woods Hole Oceanographic Institution
WHOI cruise planning synopsis>
Cruise information and original data are available from the NSF R2R data catalog. |
We will test the hypothesis that the continental margin of northwest Africa provides a significant subsurface supply of iron to the open eastern tropical Atlantic that supplements dust.
We will test our continental margin hypothesis with a wintertime visit to the new Tropical Eastern North Atlantic Time-Series Observatory (TENATSO) near Cape Verde, located in the eastern tropical Atlantic about 850 km downstream of Mauritanian coastal upwelling, and a summertime cross-shelf transect from the Mauritanian coast to TENATSO with Ed Boyle, who is already funded to study iron in the tropical Atlantic. Our cross-shelf transect will closely examine the potential lateral source of Fe, and evaluate it against an atmospheric source of Fe. Our proposal takes advantage of a novel combination of measurements to uniquely determine the importance of lateral transport vs. dust inputs and subsurface remineralization as Fe sources to the surface ocean. These measurements include:
1) synchrotron x-ray analysis of particulate iron "hotspots": micron-size particles of iron detected with a synchrotron x-ray fluorescence microprobe have been previously shown to exhibit maxima at depths of continental margin input in two ocean basins. Further, the Ti:Fe ratios and the mineralogy of these particles of iron can distinguish dust-derived vs. continental margin iron. This is a qualitative tracer for a dust vs continental margin source of Fe.
2) radium isotopes: the major source of 228Ra into the study area is by diffusion from 232Th-bearing near shore and continental shelf sediments. An open-ocean to coastal transect of 228Ra activities will allow us to determine horizontal mass transfer. 228Ra will be used to quantify the lateral flux of iron from the shelf.
3) 234Th profiles: high vertical resolution 234Th profiles can be used to determine the depth of particle remineralization. This will be used to determine whether or not putative subsurface Fe maxima are from remineralization of Fe-bearing particles.
TENATSO (Tropical Eastern North Atlantic Time-Series Observatory) time series station
16°N, 24°W, North-east of Mindelo, Sao Vicente, Cape Verde
The Ocean Carbon and Biogeochemistry (OCB) program focuses on the ocean's role as a component of the global Earth system, bringing together research in geochemistry, ocean physics, and ecology that inform on and advance our understanding of ocean biogeochemistry. The overall program goals are to promote, plan, and coordinate collaborative, multidisciplinary research opportunities within the U.S. research community and with international partners. Important OCB-related activities currently include: the Ocean Carbon and Climate Change (OCCC) and the North American Carbon Program (NACP); U.S. contributions to IMBER, SOLAS, CARBOOCEAN; and numerous U.S. single-investigator and medium-size research projects funded by U.S. federal agencies including NASA, NOAA, and NSF.
The scientific mission of OCB is to study the evolving role of the ocean in the global carbon cycle, in the face of environmental variability and change through studies of marine biogeochemical cycles and associated ecosystems.
The overarching OCB science themes include improved understanding and prediction of: 1) oceanic uptake and release of atmospheric CO2 and other greenhouse gases and 2) environmental sensitivities of biogeochemical cycles, marine ecosystems, and interactions between the two.
The OCB Research Priorities (updated January 2012) include: ocean acidification; terrestrial/coastal carbon fluxes and exchanges; climate sensitivities of and change in ecosystem structure and associated impacts on biogeochemical cycles; mesopelagic ecological and biogeochemical interactions; benthic-pelagic feedbacks on biogeochemical cycles; ocean carbon uptake and storage; and expanding low-oxygen conditions in the coastal and open oceans.
| Funding Source | Award |
|---|---|
| NSF Division of Ocean Sciences (NSF OCE) |