New Analytical Methods

N2 fixation

  • Cassar, N., Tang, W., Gabathuler, H., Huang, K. 2018. Method for high frequency underway N2 fixation measurements: Flow-through incubation Acetylene Reduction Assays by Cavity ring down laser Absorption Spectroscopy (FARACAS). Analytical Chemistry, DOI: 10.1021/acs.analchem.7b04977.
    • US Patent Application # 62/619,303
  • Cassar, N., Bellenger, J.-P., Jackson, R. B., Karr, J., Barnett, B. A. 2012. N2 fixation in real-time by cavity ring-down laser absorption spectroscopy.  Oecologia: doi:10.1007/s00442-011-2105-y.

Biological O2 and pCO2

  • Cassar et al. A second generation equilibrator inlet mass spectrometer. In prep.
  • Cassar, N., Barnett, B. A., Bender, M. L., Kaiser, J., Hamme, R. C., Tilbrook, B. 2009. Continuous high-frequency dissolved O2/Ar measurements by Equilibrator Inlet Mass Spectrometry (EIMS). Analytical Chemistry 81(5): 1855-1864.

Dissolved Inorganic Carbon (DIC)

Carbon Stable & Radio-Isotope Disequilibrium & Fractionation

  • Cassar, N., Laws, E. A., Popp, B. N., Bidigare, R. R. 2002. Isotope disequilibrium Experiments: Sources of inorganic carbon for photosynthesis in a strain of Phaeodactylum tricornutum. Limnology and Oceanography 47: 1192-1197.

Matlab Scripts & Functions

Satellite NCP algorithms

Global Ocean

Genetic Programming NCP (Li & Cassar 2016)

This section provides access to our oceanic satellite NCP estimates for the world’s oceans based on genetic programming and support vector machine.  These products are based on:

  • Sensor: SeaWiFS and MODISA
  • Spatial resolution: 4 and 9 km
  • Temporal resolution: daily, 8-day, monthly and climatology
  • NCP_metadata.

Further description of the algorithms is provided in:

Li, Z. & Cassar, N. 2016. Satellite estimates of net community production based on O2/Ar observations and comparison to other estimates. Global Biogeochemical Cycles, doi: 10.1002/2015GB005314.

Data access methods

Access estimates based on specific algorithms:

Southern Ocean

This section provides access to our oceanic satellite NCP estimates for the Southern Ocean based on self-organizing maps/artificial neural networks.

Further description of the algorithms is provided in:

Chang, C.-H., Johnson, N. C., Cassar, N. 2014. Neural network-based estimates of Southern Ocean net community production from in-situ O2/Ar and satellite observations: A methodological study. Biogeosciences, 11: 3279-3297.

Data access method: Access Southern Ocean NCP estimates here: Chang et al. (2014) : Southern Ocean SOM NCP

Western Antarctic Peninsula

This section provides access to our oceanic satellite NCP estimates for the Western Antarctic Peninsula based on a Bayesian hierarchical model.

  • Antarctic Peninsula NCP_metadata

Further description of the algorithms is provided in:

Li, Z., Cassar, N., Huang, K.,  Ducklow, H., Schofield, O. 2016. Interannual variability in net community production at the Western Antarctic Peninsula region (1997-2014). Journal of Geophysical Research, doi: 10.1002/2015JC011378.

Data access method: Access WAP NCP estimates here:  SeaWiFS and MODISA

Data Products

  1. O2/Ar-NCP observations

  2. N2 fixation estimates (in prep.)

  3. High-resolution DIC estimates

  4. Link to sequencing reads (in prep.)

Family recipes

ZE KIF (a collection of family [and others’] recipes)

“Cette cuisine est un monde dont la cheminée est le soleil.”      V. Hugo