| Contributors | Affiliation | Role |
|---|---|---|
| Lam, Phoebe J. | Woods Hole Oceanographic Institution (WHOI) | Principal Investigator, Contact |
| Boyle, Edward A. | Massachusetts Institute of Technology (MIT) | Co-Principal Investigator |
| Gegg, Stephen R. | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
| File |
|---|
McLanePumps_Summary.csv (Comma Separated Values (.csv), 5.87 KB) MD5:d78d12c69fb1c4346d8e8a9b48a0e843 Primary data file for dataset ID 3483 |
| Parameter | Description | Units |
| cruise_id | SERENA Cruise Id | text |
| deployment_num | SIRENA McLane Pump Deployment Number | integer |
| station_num | SIRENA station number | integer |
| date | Station Date | YYYYMMDD |
| time | Station Time | HHMM |
| lat | Station Latitude (South is negative) | decimal degrees |
| lon | Station Longitude (West is negative) | decimal degrees |
| SIM_Number | SIM Number | integer |
| Actual_instrument_depth | Actual instrument depth: Used matlab to take the mean of depth while at depth to figure out total wire out; Then figured depth sensor is 1m below end of line and filter holder is 1m above depth marker; So deepest pump is delta wire out+2m away from CTD depth. | meters |
| Volume_filtered | Volume filtered | liters |
| Dataset-specific Instrument Name | McLane Pump |
| Generic Instrument Name | McLane Pump |
| Generic Instrument Description | McLane pumps sample large volumes of seawater at depth. They are attached to a wire and lowered to different depths in the ocean. As the water is pumped through the filter, particles suspended in the ocean are collected on the filters. The pumps are then retrieved and the contents of the filters are analyzed in a lab. |
| Website | |
| Platform | R/V Oceanus |
| Start Date | 2008-08-06 |
| End Date | 2008-09-04 |
| Description | R/V Oceanus Voyage #449, Leg II was a trans-Atlantic transect from Bridgetown, Barbados to Porto Grande, Cape Verde (5-20 degrees North, 20-58 degrees West). 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.
Measurements include: CTD profiles, U/W Tow Fish Water Sampler, Trace Metal Profiles mostly in upper 1000 meters and one cast to 6000 meters, SeaSoar SeaMac Winch to deploy eleven battery-operated in-situ pumps with sci-provided non-metallic wire off the 01 deck using the side A-frame and SSSG non-metallic block and Gravity Coring
WHOI cruise planning synopsis
Cruise information and original data are available from the NSF R2R data catalog. |
| 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) |