POPPS buoy data (POPPS; Project on Ocean Productivity Profiling System)
These are POPPS buoy data deployed at Stations K2 and S1.
Now all data are available to authorized users only.
Directory | Period | Location | Vessel and cruise ID (Installation-Recovery) | Cruise report |
---|---|---|---|---|
PB1001_K2 | 2010/01/27-2010/02/15 | K2 | Mirai (MR10-01)-Mirai (MR10-06) | |
PB1001_S1 | 2010/02/03-2010/05/10 | S1 | Mirai (MR10-01)-Hakuho-Maru (KH10-01) | |
PB1011_S1 | 2010/11/10-2011/01/18 | S1 | Mirai (MR10-06)-Mirai(MR11-02) | |
PB1102_S1 | 2011/02/19-2011/03/25 | S1 | Mirai (MR11-02)-Mirai (MR11-05) | |
PB1107_S1 | 2011/08/2-2011/11/27 | S1 | Mirai (MR11-05)-Mirai (MR12-02) |
For details concerning the POPPS buoy, see Fujiki et al. (2008) [Mar Ecol Prog Ser 353: 81-88] and preliminary cruise reports.
Data stored in each directory:
ADCP: ADCP (Acoustic Doppler Current Profiler) data binary file for WinADCP
CTD : CTD (Conductivity, Temperature, and Depth) & DO (Dissolved Oxygen) data (explanation of file format)
FRRF: FRRF (Fast Repetition Rate Fluorometer) data (explanation of file format)
Description of POPPS data
CTD & DO data (explanation of file format)
CTD and DO data are stored in MS Excel format.
(Definition of filename)
Observation ID_Date_Time_Station.csv
Observation ID: PB**** PB stands for POPPS Buoy; **** is the installation date (the last two digits of the year + the two digits of the month)
Date: day of observation (the four digits of the year + the two digits of the month + the two digits of the day)
Time: starting time of observation (local time) (the two digits of the hour + the two digits of the minute)
Station: station name
Example: PB1001_20100203_1200_K2.xlsx; representing “POPPS buoy, Jan 2010, 3 Jan 2010, starting at 1200 hours, station K2”
(Contents of file)
Column: Content (Unit/Format)
A: Date (yyyy/mm/dd)
B: Time (hh:mm:ss)
C: Conductivity
D: Temperature (oC)
E: Depth (m)
F: Salinity
G: Oxygen saturation (Oxygen optode) (%)
FRRF data (explanation of file format)
FRRF data are stored in MS Excel format.
(Definition of filename)
FRRF_Observation ID_Station_Date.xlsx
Observation ID:FRRF data measured during the MIRAI cruises (MR****) [MR **** is cruise ID]
FRRF data measured with the POPPS buoy (PB****) [PB stands for POPPS Buoy, **** is installation date (the last two digits of the year + the two digits of the month)]
Station: station name
Date: observational day and starting time (local time) (the two digits of the month + the two digits of the day + the two digits of the hour + the two digits of the minute)
Example: FRRF_MR10-06_K2_10260455.xlsx or FRRF_PB1001_S1_02031200.xlsx
(Contents of file)
The file consists of three pages (Raw、Selected、Figure).
・Sheet [Raw]
Photosystem II (PSII) parameters were derived from a single-turnover-type fluorescence induction curve by using custom-written software (calc2.exe) in accordance with the procedure described by Kolber et al. (1998) [Biochim Biophys Acta 1367: 88-106].
・Sheet [Selected]
Primary production rates were calculated according to the equation described by Kolber and Falkowski (1993) [Limnol Oceanogr 38: 1646-1665].
Column and Content
A1-B5: Date of observation (UTC), station
A7-C9: Data quality control
V6-V10: Conversion factor (from FmD to Chl a concentration)
AA5-AG9: Equations and parameters for calculating primary productivity
Header and Content
Time: hh:mm:ss
Depth: Meters
PAR: Photosynthetically active radiation (μmolquanta m-2 s-1)
FOL: Minimum fluorescence yield under actinic light
FmL: Maximum fluorescence yield under actinic light
R2L: Correlation coefficient under actinic light measurement
SigL: Effective absorption cross section of PSII under actinic light (Å2 quanta–1)
pL: Connectivity between PSII reaction centers under actinic light
TauL: Turnover time for oxidation of Qa- under actinic light (μs)
FOD: Minimum fluorescence yield in darkness
FmD: Maximum fluorescence yield in darkness
R2D: Correlation coefficient in darkness measurement
SigD: Effective absorption cross section of PSII in darkness (Å2 quanta–1)
pD: Connectivity between PSII reaction centers in darkness
TauD: Turnover time for oxidation of Qa- in darkness (μs)
FvL: Variable fluorescence under actinic light (FmL-FOL)
FvL/FmL: Photochemical efficiency under actinic light
FvD: Variable fluorescence in darkness (FmD-FOD)
FvD/FmD: Maximum photochemical efficiency
Chl-a(FmD): Chlorophyll a concentration estimated from FmD (mg m-3)
PAR: Photosynthetically active radiation (quanta m-2 s-1)
σpsii: Effective absorption cross section of PSII under actinic light (m2 quanta–1)
τqa:Turnover time for oxidation of Qa- under actinic light (s)
C(E):Fraction of reaction centers closed
F':Fluorescence yield under actinic light
Qp:Photochemical quenching coefficient under actinic light
1/τp:Rate of electron transfer from PSII to PSI (s-1)
Φe:Quantum yield of electron transport for O2 evolution in PSII (O2 quanta-1)
PbO:Rate of O2 evolution (O2 Chla-1 s-1)
PbC:Rate of carbon fixation (mgC mgChla-1 h-1)
Equations for calculating primary productivity (Kolber and Falkowski (1993) Limnol Oceanogr 38: 1646-1665)
Rate of O2 evolution (PbO) can be determined by substituting the parameters into the following equation:
PbO = PAR・σpsii・ Qp・Φe・nPSII・(FvD/FmD/0.65)
where
Qp = (FmD-F')/(FmD-FOD)
F' = FOD+(FmD-FOD)・C(E)
C(E) = PAR・σpsii /(PAR・σpsii+1/TauL)
Φe can be expressed as
Φe = 0.250 if PAR・σpsii・Qp ≦ 1/τp
Φe = 0.250/(PAR・σpsii・Qp・τp) if PAR・σpsii・Qp > 1/τp
where
τp = 1/(Ek・σpsii)
Ek = 1.20×1020 [quanta m-2 s-1] (Ek: Light saturation constant of P-E response curve)
nPSII = 0.002 [molRCII molChla–1] (nPSII: Photosynthetic unit size of PSII)
Rate of carbon fixation (PbC) can be determined as
PbC = 3600・(PbO/R)・(MC/MChla)
where
R: Ratio of evolved O2 to fixed CO2 (= 1 molO2 molC–1)
MC: Atomic weight of carbon (= 12.01)
MChla: Molecular weight of chlorophyll a (= 893.5)
・Sheet [Figure]
Vertical profiles of PAR (μmolquanta m-2 s-1), PbC (mgC mgChla-1 h-1), chl-a (mg m-3), R2, Fv/Fm, σpsii (Å2 quanta–1), τ (μs) and Qp are shown in figures.
Red lines are the data measured in the light chamber. Blue lines are the data measured in the dark chamber.