Biogeochemistry (BGC)

This page provides information on biogeochemistry (BGC) modelling effort at COSIMA.

List of model experiments that include BGC

  • OFAM3
    • ofam3-his JRA55 1979-2014
    • ofam3-pro
    • ofam3-con 1979
    • ofam3-spi 1979 x 20 years
  • OMIP using ACCESS-OM2 (1 degree)
    • omip2 r1i1p1f1 (default)
      • initial alk, adic, dic fields multiplied by 1.025 kg m-3 for unit conversion
      • initial T fields are potential temperature.
      • new bathymetry.
      • Raw output available on Gadi (you need to be a member of v45): /scratch/v45/hh0162/access-om2/control/1deg_jra55_iaf_omip2-fixed/archive/ (output000-365)
      • Output put to be post-processed for submission to the CMIP6-OMIP archive.
    • omip2spunup r1i2p2f1
      • Initial conditions and bathymetry are different from r1i1p1f1
        • initial alk, adic, dic fields multiplied by 1.024 kg m-3 for unit conversion
        • initial BGC fields contain zero values in some ocean grid cells.
        • initial T fields are conservative temperature.
        • old bathymetry (as in Kiss et al., 2020).
      • omip2spunup was initialised from a 2013-year spun-up state.
      • 2013 years = 6 cycles of JRA55-do v1.4.0 (i.e. omip2 r1i2p2f1) + 27 additional cycles.
      • Raw output available on Gadi (you need to be a member of v45): /scratch/v45/hh0162/access-om2/control/1deg_jra55_iaf_omip2/archive/ (output2013-2378)
      • Output put to be post-processed for submission to the CMIP6-OMIP archive.
    • IAMIP2 using ACCESS-OM2
      • Historical based on JRA55-do v1.4.0: 1958-2018
      • Projection based on CMIP6-SSP585: 2015-2100
      • Exclusion: 2015-2100 (simulation without sea-ice BGC)
      • Control based on RYF of JRA55-do v1.4.0: 1958-2100

List of BGC projects

Project title
Model
Experiment
Need
Contact/Reference
Marine heatwave impacts on BGC
OFAM3
 ofam3-his/pro/con
Surface, daily, near-global
Hayashida et al. (2020)
Eddy impacts on nutrients in the Southern Ocean
OFAM3
Whole depth, daily
Ram Patel
Global carbon and heat budget
OFAM3
 ofam3
Eric Mortenson
Global ocean acidification
OFAM3
Paula Conde Pardo
Ocean Model Intercomparison Project-BGC (OMIP-BGC)
ACCESS-OM2
omip2
Follow the OMIP protocol
Hakase Hayashida
Ice Algae Model Intercomparison Project phase 2 (IAMIP2)
ACCESS-OM2
iamip2-his, iamip2-pro, iamip2-exc, iamip2-con
Follow the IAMIP2 protocol
Hayashida et al. (submitted)
Community Production in eddies in the Southern Ocean
ACCESS-OM2
daily, upper 375m, 1999-present
Jiaoyang Su
Climate change impacts on the bloom initiation in the Southern Ocean
CanNEMO?
iamip2-pro
daily
Clara R. Vives
Understanding the impacts of fine-scale sea ice and ocean dynamics on Southern Ocean ecosystems
ACCESS-OM2
iamip2-his-0p1 and iamip2-pro-0p1
daily
Denisse Fierro Arcos
Linking the iron and carbonate systems in ice-free and ice-covered Southern Ocean environments
NEMO?
PhD project (primary supervisor: Delphine Lannuzel)
 Projected changes of iron pathways in the tropical Pacific  OFAM3, ACCESS-OM2 ofam3-pro, iamip2-pro-01 daily, upper 1000 m, fe, u, v, w, o2  Annette Stellema

WOMBAT

WOMBAT is the default BGC model for ACCESS-OM2. WOMBAT consists of 10 state variables: adic, dic, alk, o2, no3, fe, phy, zoo, det, caco3.

 

WOMBAT diagnostics are as follows:

  • adic, anthropogenic+pre-industrial DIC*, mmol m-3
  • dic, pre-industrial DIC*, mmol m-3
  • alk, total alkalinity, mmol m-3
  • o2, dissolved oxygen, mmol m-3
  • no3, nitrate, mmol m-3
  • fe, dissolved iron, umol m-3
  • phy, phytoplankton biomass, mmol N m-3
  • zoo, zooplankton biomass, mml N m-3
  • det, detritus, mmol N m-3
  • caco3, calcium carbonate, mmol m-3
  • stf09, anthropogenic+pre-industrial DIC flux into ocean, mmol m-2 s-1
  • stf07, pre-industrial DIC flux into ocean, mmol m-2 s-1
  • stf03, dissolved oxygen flux into ocean, mmol m-2 s-1
  • paco2, anthropogenic+pre-industrial pCO2
  • pco2, pre-industrial pCO2
  • pprod_gross_2d, vertically integrated gross primary production, mmol N m-2 s-1
  • surface_, tracer concentration in the surface layer, (e.g. surface_phy).

*The only difference between adic and dic is that air-sea CO2 flux is calculated using the actual atmospheric CO2 in the former after Year 1850, whereas the latter is fixed to a pre-industrial atmospheric CO2. So taking the difference between adic and dic gives the anthropogenic CO2 absorbed by the model ocean.

Contact

If you are interested in our model products, please contact:

  • Xuebin Zhang or Richard Matear for OFAM3
  • Hakase Hayashida or Richard Matear for ACCESS-OM2
  • Reference

References

  • Hayashida, H., Matear, R. J., & Strutton, P. G. (2020): Background nutrient concentration determines phytoplankton bloom response to marine heatwaves, Global Change Biology.
  • Hayashida, H., Jin, M., Steiner, N. S., Swart, N. C., Watanabe, E., Fiedler, R., Hogg, A. McC., Kiss, A. E., Matear, R. J., and Strutton, P. G.: Ice Algae Model Intercomparison Project phase 2 (IAMIP2), Geosci. Model Dev. Discuss. [preprint], https://doi.org/10.5194/gmd-2020-305, in review, 2020.