Profile data products from R/V Atlantic Explorer and R/V Cape Hatteras multiple cruises in the Sargasso Sea, Bermuda Atlantic Time Series (BATS) area, and Hydrostation "S" from 2007 to 2008 (ON DEQUE project)

Version: 22 August 2011
Version Date: 2011-07-22

» 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

Database Profile Data Products

Acquisition Description


Processing Description

BCO-DMO Processing Notes
Generated from original .xlsx file "ONDEQUE Database_v1.0.xlsx", Sheet: "Profile Data Products" contributed by Robert Vallancourt


 - Column inserted for Date_UTC to go along with Time_UTC
 - "nd" (no data) value inserted in blank cells
 - Parameter names modified to conform to BCO-DMO convention  

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ProjectIdID Info; Project text
CruiseIdID Info; Cruise Name text
StationIdID Info; On Deque station ID integer
CastIdID Info; CAST ID text
Location_DescriptionID Info; Location Description text
YearID Info; Year YYYY
MonthID Info; Gregorian Month text
Day_of_MonthID Info; Day of Gregorian Month DD
Day_of_YearID Info; Sequential Day of Year (whole days 1 = 1 Jan) DDD
Time_UTCID Info; UTC Time HHMM
Date_LocalID Info; Local Date YYYYMMDD
Time_LocalID Info; Local Time HHMM
LonID Info; Longitude (deg E) decimal degrees
LatID Info; Latitude (deg N) decimal degrees
DepthID Info; Depth (meters) meters
Optical_DepthOptical Depth [lnPAR0-/PARz) [lnPAR0-/PARz)
PressureCTD Info; Pressure [db] decibars
Depth_CTD_aCTD Info; Depth [m] meters
Potential_TempCTD Info; Potential Temperature (T090) [deg C] degrees C
TemperatureCTD Info; Temperature (T090) [deg C] degrees C
ConductivityCTD Info; Conductivity [S m-1] S m-1
SalinityCTD Info; Salinity [psu] psu
DensityCTD Info; Density [Kg m-3] Kg m-3
Density_sigma_tCTD Info; Density sigma t [Kg m-3] Kg m-3
Beam_AttenuationCTD Info; Beam Attenuation [m-1] [m-1
Beam_TransmissivityCTD Info; Beam Transmissivity [%] percentage
Fluorescence_ChelseaCTD Info; Fluorescence; Chelsea [mg m-3] mg m-3
PAR_IrradianceCTD Info; PAR/Irradiance; mol quanta/m^2(??)
Fluorometric_Chl_extractedFl-Chl; Fluorometric Chl (extracted) (mg m-3) mg m-3
Depth_NominalNuts; Nominal Depth (m) meters
Depth_CTD_bCTD Info; Depth [m] meters
PO4_minus_PNuts; PO4-P (ug at P L-1) ug at P L-1
NO2_plus_NO3_minus_NNuts; NO2+NO3-N (ug at N L-1) ug at N L-1
Silicate_minus_SiNuts; Silicate-Si (ug at Si L-1) ALL BELOW DETECTION LIMITS OF 2.86 ug at Si L-1
Depth_Nominal_PPIS PP; Nominal PP Depth [m] meters
PP_Sample_NumberIS PP; PP Sample # integer
Primary_Productivity_12hourIS PP; Primary PRoductivity by 12hour In-situ Incubation [mg C m-3 12h-1] mg C m-3 12h-1
Primary_Productivity_24hourIS PP; Primary PRoductivity by 24hour In-situ Incubation [mg C m-3 12h-1] mg C m-3 12h-1
Daily_PAR_Irradiance_SurfaceDaily Surface PAR Irradiance (Hargreave's LiCor) [mol quanta/m^2] mol quanta/m^2
Daily_PAR_Irradiance_Depth_ZDaily PAR Irradiance at depth z (Hargreave's LiCor) [mol quanta/m^2] mol quanta/m^2
Ap_440Ap; Ap-440 [m-1] m-1
Ap_675Ap; Ap-675 [m-1] m-1
mean_ApAp; mean Ap [m-1] m-1
Ad_440Ap; Ad-440 [m-1] m-1
Ad_675Ap; Ad-675 [m-1] m-1
mean_AdAp; mean Ad [m-1] m-1
Aph_440Ap; Aph-440 [m-1] m-1
Aph_675Ap; Aph-675 [m-1] m-1
mean_AphAp; mean Aph [m-1] m-1
spec_wtd_aph_rt_tronAp; spec-wtd aph [1/m] (spec-wtd to spectrum of rp-tron bulb) 1/m
spec_wtd_aph_in_situAp; spec-wtd aph [1/m] (spec-wtd to in-situ spectrum) 1/m
spec_wtd_appcspec-wtd appc [1/m] (spec-wtd to in-situ spectrum) 1/m
appc_to_aphappc/aph (%) percentage
spec_wtd_apspspec-wtd apsp [1/m] (spec-wtd to in-situ spectrum) 1/m
ProchlorococcusFCM; Prochlorococcus (cells ml-1 SW) cells ml-1 SW
SynechococcusFCM; Synechococcus (cells ml-1 SW) cells ml-1 SW
Picoeukaryotes_totalFCM; Picoeukaryotes (total) (cells ml-1 SW) cells ml-1 SW
NanoeukaryotesFCM; Nanoeukaryotes (cells ml-1 SW) cells ml-1 SW
TChl_aHPLC; [TChl a] (mg/m^3) mg/m^3
Tchl_bHPLC; [TChl b](mg/m^3) mg/m^3
TChl_cHPLC; [TChl c] (mg/m^3) mg/m^3
CaroHPLC; [Caro] (mg/m^3) mg/m^3
But_fucoHPLC; [But fuco] (mg/m^3) mg/m^3
Hex_fucoHPLC; [Hex fuco] (mg/m^3) mg/m^3
AlloHPLC; [Allo] (mg/m^3) mg/m^3
DiadHPLC; [Diad] (mg/m^3) mg/m^3
DiatoHPLC; [Diato] (mg/m^3) mg/m^3
FucoHPLC; [Fuco] (mg/m^3) mg/m^3
PeridHPLC; [Perid] (mg/m^3) mg/m^3
ZeaHPLC; [Zea] (mg/m^3) mg/m^3
Chl_aHPLC; [Chl a] (mg/m^3) mg/m^3
DVChl_aHPLC; [DVChl a] (mg/m^3) mg/m^3
Chlide_aHPLC; [Chlide a] (mg/m^3) mg/m^3
Chl_bHPLC; [Chl b] (mg/m^3) mg/m^3
DVChl_bHPLC; [DVChl b] (mg/m^3) mg/m^3
Chl_c1HPLC; Chl c1 (mg/m^3) mg/m^3
Chl_c2HPLC; Chl c2 (mg/m^3) mg/m^3
Chl_c12HPLC; [Chl c12] (mg/m^3) mg/m^3
Chl_c3HPLC; [Chl c3] (mg/m^3) mg/m^3
LutHPLC; [Lut] (mg/m^3) mg/m^3
NeoHPLC; [Neo] (mg/m^3) mg/m^3
ViolaHPLC; [Viola] (mg/m^3) mg/m^3
Phytin_aHPLC; [Phytin a] (mg/m^3) mg/m^3
Phide_aHPLC; [Phide a] (mg/m^3) mg/m^3
PrasHPLC; [Pras] (mg/m^3) mg/m^3
Gyr_diesterHPLC; [Gyr diester] (mg/m^3) mg/m^3
TChlHPLC; [TChl] (mg/m^3) mg/m^3
PPCHPLC; [PPC] (mg/m^3) mg/m^3
PSCHPLC; [PSC] (mg/m^3) mg/m^3
PSPHPLC; [PSP] (mg/m^3) mg/m^3
TCaroHPLC; [TCaro] (mg/m^3) mg/m^3
TAccHPLC; [TAcc] (mg/m^3) mg/m^3
TPigHPLC; [TPig] (mg/m^3) mg/m^3
DPHPLC; [DP] (mg/m^3) mg/m^3
PmaxPvsE Exps; Pmax [mgC m^-3 h^-1] mgC m^-3 h^-1
Pmax_ERRORPvsE Exps; Pmax ERROR [mgC m^-3 h^-1] mgC m^-3 h^-1
alphaPvsE Exps; alpha [mgC m^-3 h^-1 (uE/m^2s)^-1] mgC m^-3 h^-1 (uE/m^2s)^-1
alpha_ERRORPvsE Exps; alpha ERROR [mgC m^-3 h^-1 (uE/m^2s)^-1] mgC m^-3 h^-1 (uE/m^2s)^-1
Fo_particulateFRRF; Fo (particulate) (tbd)
Fo_standard_errorFRRF; fo_standard error (tbd)
Fm_particulateFRRF; Fm (particulate) (tbd)
Fm_standard_errorFRRF; Fm_standard error (tbd)
Fv_particulateFRRF; Fv (particulate) (tbd)
Fv_Standard_errorFRRF; Fv Standard error (tbd)
Fv_to_Fm_particulateFRRF; Fv/Fm (particulate) (tbd)
Fv_to_Fm_sterrFRRF; Fv/Fm_sterr (tbd)
SigmaPSII_particulateFRRF; SigmaPSII (particulate) [A^2/quanta] A^2/quanta
SigmaPSII_Standard_errorFRRF; SigmaPSII Standard error [A^2/quanta] A^2/quanta
p_valueFRRF; p-value (tbd)
p_value_standard_errorFRRF; p-value standard error (tbd)
tau_particulateFRRF; tau (particulate) (tbd)
tau_sterrFRRF; tau_sterr (tbd)

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R/V Atlantic Explorer
Start Date
End Date


R/V Atlantic Explorer
Start Date
End Date


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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