Niskin bottle measurements from CTD casts from R/V Cape Hatteras CH0508 in the Sargasso Sea, Bermuda Atlantic Time Series (BATS) area, and Hydrostation "S" in 2008 (ON DEQUE project)

Version: 22 August 2011
Version Date: 2011-08-22

» Optical and Nutrient Dependence of Quantum Efficiency (ON DEQUE)

» Ocean Carbon and Biogeochemistry (OCB)
Vaillancourt, Robert D.Millersville UniversityPrincipal Investigator, Contact
Marra, John F.Brooklyn College (CUNY Brooklyn)Co-Principal Investigator
Gegg, Stephen R.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Dataset Description

OnDeque - CH0508 CTD Bottle F iles

Methods & Sampling


Data Processing Description

BCO-DMO Processing Notes
Generated from original .xlsx file "CH0508_CTD data.xlsx", Sheet: "OnDeque3 CTD Bottle Files" contributed by Robert Vallancourt


 - Date_UTC formed from Year, Gregorian Month and Day of Gregorian Month
 - "nd" (no data) value inserted in blank cells
 - Parameter names modified to conform to BCO-DMO convention  

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Data Files

(Comma Separated Values (.csv), 162.48 KB)
Primary data file for dataset ID 3534

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ProjectIdON DEQUE Project Id text
CruiseIdON DEQUE Cruise Id text
StationIdON DEQUE Station Id text
Cast_IdON DEQUE Cast Id text
YearYear YYYY
Date_LocalDate Local YYYYMMDD
Time_LocalTime Local HHMM
LonStation longitude (West is negative) decimal degrees
LatStation latitude (South is negative) decimal degrees
Bottle_PositionBottle Position integer
Potemp090CPotential Temperature degrees celsius
PrDMPressure deibars
DepSMDepth meters
T090CTemperature degrees celsius
Sal00Salinity psu
Density00Density Kg m-3
Sigma_t00Density sigmat Kg m-3
C0S_per_m(tbd) (tbd)
BatBeam Attenuation m-1
XmissBeam Transmissivity percentage
FlCFIC (tbd)
Wet_Labs_FlFluorescence Wet Labs mg m-3
SbeOx0Oxygen SBE43 Mm/Kg
PARPAR/Irradiance uEm-2sec-1 (??)
Time_ElapsedTime Elapsed minutes
ScanScan integer
NoteNote/Comment text

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Dataset-specific Instrument Name
CTD profiler
Generic Instrument Name
CTD - profiler
Generic Instrument Description
The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This term applies to profiling CTDs. For fixed CTDs, see

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R/V Cape Hatteras
Start Date
End Date

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Project Information

Optical and Nutrient Dependence of Quantum Efficiency (ON DEQUE)

Coverage: Western North Atlantic Ocean. Sargasso Sea, Gulf stream, slope waters, shelfbreak front, continental shelf, mid-Atlantic bight

The control of photosynthetic quantum yield of phytoplankton
by light intensity and diapycnal nutrient flux

Primary production in the ocean is probably the least known part of the ocean's
carbon cycle. One reason that primary production is little known is the lack of
understanding of the geographical and temporal variability in phytoplankton physiology.
For example it is only recently that the importance has been revealed, of the
so-called photoprotectant pigments, pigments that, in effect, shield the photosynthetic
apparatus from too much sunlight. This project will investigate the geographic and
temporal variability of a fundamental property of oceanic photosynthesis: the quantum
yield, or the ratio of the available light to the amount of carbon fixed in photosynthesis.
The PIs propose an hypothesis based on earlier measurements, that in the lower parts
of the euphotic zone in the stratified ocean, the upward flux of nutrients regulates
the value of the quantum yield, while in the upper parts, irradiance governs its value,
through the pigment composition of the phytoplankton. This hypothesis will be tested
by making estimates of the quantum yield's maximum value through very careful and
comprehensive measurements of the bio-optical properties and species composition of
the phytoplankton, as well as the submarine light environment, hydrography, and nutrients.
These measurements will be along both temporal and spatial gradients in the ocean to
create the basis for environmental regulation of quantum yield. These measurements will
be used to establish precisely how the maximum value of the quantum yield is regulated
by solar flux and plant nutrients. This research provides a mechanism to understand
how the processes of nutrient supply and light affect the physiology of natural populations
of phytoplankton, a long-standing problem in biological oceanography. It also provides a
means for improving the modeling primary productivity, including estimating productivity
in the global ocean from space.

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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.

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Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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