MIT vane measurements from R/V Oceanus cruise OC449-03 in the Coastal transect between Cape Verde and Mauritanian coast in 2008 (SIRENA project)

Website: https://www.bco-dmo.org/dataset/3479
Version: 11 May 2011
Version Date: 2011-05-11

Project
» Sources of Iron to the EasterN tropical Atlantic (SIRENA)

Program
» Ocean Carbon and Biogeochemistry (OCB)
ContributorsAffiliationRole
Lam, Phoebe J.Woods Hole Oceanographic Institution (WHOI)Principal Investigator, Contact
Gegg, Stephen R.Woods Hole Oceanographic Institution (WHOI)BCO-DMO Data Manager


Dataset Description

MIT Vane Sample Log
Note: These data collected only on cruise OC449-03
 

Data Processing Description

BCO-DMO Processing Notes
Generated from original spreadsheet file: "MITVane_OC449-3_samplelog.xls" contributed by Phoebe Lam
BCO-DMO Edits
- Parameter names modified to conform to BCO-DMO convention
- cruise_ids added to the data
- date reformatted to date as YYYYMMDD
- time reformatted to time as HHMM
- Lat/Lon inserted from station log

[ table of contents | back to top ]

Data Files

File
MIT_Vane.csv
(Comma Separated Values (.csv), 1.27 KB)
MD5:05c0ffb3c0a3dbb038adf1310e0188bb
Primary data file for dataset ID 3479

[ table of contents | back to top ]

Parameters

ParameterDescriptionUnits
cruise_id

SERENA Cruise Id

text
station

Station Number

integer
cast

Cast 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
Vane

Vane Number

integer
goal_depth

Goal depth

meters
wire_out

Wire out

meters
actual_depth

Actual depth determined using Vemco pressure sensor (usually on Vane 1)

meters


[ table of contents | back to top ]

Instruments

Dataset-specific Instrument Name
MIT Vane
Generic Instrument Name
MIT Vane


[ table of contents | back to top ]

Deployments

OC449-03

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.


[ table of contents | back to top ]

Project Information

Sources of Iron to the EasterN tropical Atlantic (SIRENA)


Coverage: Tropical North Atlantic, focusing on a Cape Verde to Mauritanian Coast transect


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

TENATSO Home

TENATSO/SIRENA at Cafe Thorium/WHOI



[ table of contents | back to top ]

Program Information

Ocean Carbon and Biogeochemistry (OCB)


Coverage: Global


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.



[ table of contents | back to top ]

Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

[ table of contents | back to top ]