Submitted as: model experiment description paper 17 Nov 2020

Submitted as: model experiment description paper | 17 Nov 2020

Review status: a revised version of this preprint is currently under review for the journal GMD.

Ice Algae Model Intercomparison Project phase 2 (IAMIP2)

Hakase Hayashida1,2, Meibing Jin3,4,5, Nadja S. Steiner6,7, Neil C. Swart7, Eiji Watanabe8, Russell Fiedler9, Andrew McC. Hogg2,10, Andrew E. Kiss2,10, Richard J. Matear2,9, and Peter G. Strutton1,2 Hakase Hayashida et al.
  • 1Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia
  • 2Australian Research Council Centre of Excellence for Climate Extremes, Australia
  • 3School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China
  • 4Southern Laboratory of Ocean Science and Engineering, Zhuhai, China
  • 5International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, USA
  • 6Fisheries and Oceans Canada, Institute of Ocean Sciences, Sidney, BC, Canada
  • 7Canadian Centre for Climate Modelling and Analysis, Environment and Climate Change Canada, Victoria, BC, Canada
  • 8Japan Agency for Marine‐Earth Science and Technology, Yokosuka, Kanagawa, Japan
  • 9CSIRO Oceans and Atmosphere, Hobart, TAS, Australia
  • 10Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia

Abstract. Ice algae play a fundamental role in shaping polar marine ecosystems and biogeochemistry. This role can be investigated by field observations, however the influence of ice algae at the regional and global scales remains unclear due to limited spatial and temporal coverage of observations, and because ice algae are typically not included in current Earth System Models. To address this knowledge gap, we introduce a new model intercomparison project (MIP), referred to here as the Ice Algae Model Intercomparison Project phase 2 (IAMIP2). IAMIP2 is built upon the experience from its previous phase, and expands its scope to global coverage (both Arctic and Antarctic) and centennial timescales (spanning the mid-twentieth century to the end of the twenty-first century). Participating models are three-dimensional regional and global coupled sea ice–ocean models that incorporate sea-ice ecosystem components. These models are driven by the same initial conditions and atmospheric forcing datasets by incorporating and expanding the protocols of the Ocean Model Intercomparison Project, an endorsed MIP of the Coupled Model Intercomparison Project phase 6 (CMIP6). Doing so provides more robust estimates of model bias and uncertainty, and consequently advances the science of polar marine ecosystems and biogeochemistry. A diagnostic protocol is designed to enhance the reusability of the model data products of IAMIP2. Lastly, the limitations and strengths of IAMIP2 are discussed in the context of prospective research outcomes.

Hakase Hayashida et al.

Status: final response (author comments only)
Status: final response (author comments only)
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Hakase Hayashida et al.

Hakase Hayashida et al.


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Short summary
Ice algae are tiny plants like phytoplankton but they grow within sea ice. In polar regions, both phytoplankton and ice algae are the foundation of marine ecosystems and play an important role in taking up carbon dioxide in the atmosphere. However, state-of-the-art climate models typically do not include ice algae, and therefore their role in the climate system remains unclear. This project aims to address this knowledge gap by coordinating a set of experiments using sea ice-ocean models.