Documentation

Processing

The NAAMES Bio-Argo floats send their profiles to the UMaine server. The data is processed and rendered in near real-time. The different level of data are available on our ftp and are described below:

  • RAW: all msg and log received from Navis BGCi including incomplete files due to early end of transmission.
  • RAW_EOT: only complete msg and log are kept.
  • L0: hexadecimal data stored in msg is decoded in decimal numbers and cnverted to csv files.
  • L1: calibrate level 0 data using manufacturer calibration.
  • L2: adjust and correct the data and compute additional product.
    • fchl is corrected for non-photochemical quenching (Xing et al. 2012)
    • bbp is computed from beta (Zhang et al, 2009, Sullivan et al. 2013)
    • POC is computed from bbp
    • C_phyto is computed from bbp
Calibration parameters used are available here.

Table 1. List of parameters.

Variable Description Units
profileprofile number-
dtdate and timeyyyy/mm/dd hh:mm
latlatitudedecimal degree North
lonlongitudedecimal degree East
ppressuredbar
tin-situ temperature ITS-90deg C
sppratical salinity PSS-78no units
o2oxygen concentrationmL/L
turbturbidityNTU
fchlchlorophyll a fluorescencemg m-3
betaangular scatterance at 700 nm with a scattering angle of 124m-1 sr-1
fdomfluorescent colored dissolved organic matter (CDOM)mg m-3
ed###downwelling irradiance at ### nmW m-2 nm-1
parphotosynthetically available radiationμmol photons m-2 s-1
cattenuationm-1
bbpparticulate backscatter at 700 nmm-1
C_phytophytoplnakton carbonmg m-3
POCparticulate organic carbonmg m-3

References

Sullivan, J. M., M. S. Twardowski, J. Ronald, V. Zaneveld, and C. C. Moore (2013), Measuring optical backscattering in water, in Light Scattering Reviews 7, Springer Praxis Books, edited by A. A. Kokhanovsky, pp. 189–224, Springer, Berlin, doi:10.1007/978-3-642-21907-8_6.

Zhang, X., L. Hu, and M.-X. He (2009), Scattering by pure seawater: Effect of salinity, Opt. Express, 17(7), 5698–5710, doi:10.1364/OE.17.012685.

Xing, X., H. Claustre, S. Blain, F. D’Ortenzio, D. Antoine, J. Ras, and C. Guinet (2012), Quenching correction for in vivo chlorophyll fluorescence acquired by autonomous platforms: A case study with instrumented elephant seals in the Kerguelen region (Southern Ocean), Limnol. Oceanogr. Methods, 10(7), 483–495, doi:10.4319/lom.2012.10.483.