Introduction

This website provides the information regarding the input and output data of IAMIP2. For a full description, please refer to the protocol paper (Hayashida et al., 2021). For questions, email Hakase Hayashida (JAMSTEC).

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., 14, 6847–6861, https://doi.org/10.5194/gmd-14-6847-2021, 2021.

The IAMIP2 modellers and collaborators meet online once a month to discuss the progress and plans. If you are interested in joining our meetings, please contact Hakase Hayashida.

Input data for conducting IAMIP2 experiments

Historical (1958-2018)

The historical experiment is done by prescribing the following initial and boundary conditions. Click on the links below to download the data.

• Initial conditions
  • Temperature
  • Salinity
  • Oxygen
  • Dissolved inorganic carbon
  • Total alkalinity
  • Nutrients
    • Phosphate
    • Silicate
    • Nitrate
• Boundary conditions
  • Atmospheric forcing (JRA55-do)
    • Go to https://esgf-node.llnl.gov/search/input4mips/
    • On the left tab, select “OMIP” under “Target MIP”
    • Hit “Search”
    • On the left tab, select “tas, huss, uas, vas, psl, rsds, rlds, prra, prsn, friver, licalvf” under “Variable”
    • Hit “Search”
    • There should be 11 results. Download the data either individually (select “List files”) or in bulk (select “WGET Script”).
  • Atmospheric CO2 (global monthly mean under CMIP6-historical)
    • Note the above link provides data until 2014. From 2015 to 2018, no specific protocol is given, but you may prescribe the NOAA GML data (https://gml.noaa.gov/ccgg/trends/data.html) prescribe the data for CMIP6-SSP585 (the link below under “Projection (2015-2100)”.)

Projections (2015-2100)

There are four projections driven by the atmospheric outputs of two CMIP6 models (CMCC-ESM2, EC-Earth3) under two SSP scenarios (ssp126 and ssp585). These datasets are interpolated onto the JRA55-do grid and are available from the NCI Data Collection:

• EC-Earth3 ssp585: https://researchdata.edu.au/ec-earth3-ssp585-experiment-v10/1696905
• EC-Earth3 ssp126, CMCC-ESM2 ssp126, CMCC-ESM2 ssp585: https://researchdata.edu.au/atmospheric-forcing-datasets-experiments-v10/1731909
  • NOTE: prra in both EC-Earth3 ssp126 and CMCC-ESM2 ssp126 was not chunked properly. If your model has difficulty in working with these forcing datasets, use this script to change the chunk size: https://github.com/hakaseh/prep_iamip2_forcing/commit/0392545cf97dd20e9e0229217b6f6b5f0b2698cf

Atmospheric CO2 concentrations should be prescribed to the global and monthly mean values described by Meinshausen et al. (2017). These are available from the following website:

• ssp126: https://greenhousegases.science.unimelb.edu.au/data/future/CMIP6GHGConcentrationProjections_1_2_1/mole-fraction-of-carbon-dioxide-in-air_input4MIPs_GHGConcentrations_ScenarioMIP_UoM-IMAGE-ssp126-1-2-1_gr1-GMNHSH_201501-250012.csv
• ssp585: https://greenhousegases.science.unimelb.edu.au/data/future/CMIP6GHGConcentrationProjections_1_2_1/mole-fraction-of-carbon-dioxide-in-air_input4MIPs_GHGConcentrations_ScenarioMIP_UoM-REMIND-MAGPIE-ssp585-1-2-1_gr1-GMNHSH_201501-250012.csv

Exclusion (2015-2100)

The exclusion experiment is done in the identical setup as the historical experiment except that the sea-ice ecosystem component is excluded from the model.

Control (1958-2100)

The control run is done by applying the repeat-year forcing of JRA55-do v1.4.0 over 01/May/1990 – 30/April/1991. Please contact Hakase if you wish to obtain this data.

Links for more details

• OMIP-BGC website (initial conditions)
• UniMelb website (Atmospheric CO2)

Output

Changes to the diagnostics in Table 1 of Hayashida et al. (2021):

1. Replace sithick by sivol (the grid cell average ice thickness)

2. Replace sisnthick by snvol (the grid cell average snow thickness)

3. All bottom-ice quantities should be provided as grid cell averages.

The links to the IAMIP2 product will be available here when it is ready!

WARM buoys

Arctic buoys data for model evaluation/comparison:

• buoys 1-4: https://arcticdata.io/catalog/view/doi:10.18739/A2HQ3RZ96
• buoys 5,6: https://arcticdata.io/catalog/view/urn%3Auuid%3A3c6cbfb7-9b8e-4087-bf5a-2ea64aa1baa4
• buoys 7-9: please request to Victoria Hill.

References:

• https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2017JC013617
• https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JC017848