Preprints
https://doi.org/10.5194/egusphere-2025-1107
https://doi.org/10.5194/egusphere-2025-1107
15 Apr 2025
 | 15 Apr 2025

Brief communication: Intercomparison study reveals pathways for improving the representation of sea-ice biogeochemistry in models

Letizia Tedesco, Giulia Castellani, Pedro Duarte, Meibing Jin, Sebastien Moreau, Eric Mortenson, Benjamin Tobey Saenz, Nadja Steiner, and Martin Vancoppenolle

Abstract. Sea-ice biogeochemical models are key to understanding polar marine ecosystems. We present an intercomparison of six one-dimensional sea-ice biogeochemical models, assessing their ability to simulate algal phenology and nutrient dynamics by comparing them with sea-ice physical-biogeochemical data collected during the N-ICE2015 expedition. While no model fully captured observed bloom dynamics without tuning, adjustments improved biomass simulations but had a limited impact on nutrient representation. Variability in tuning strategies underscores key knowledge gaps and the need for further model development in more harmonised ways. Our findings can inform future efforts to enhance the reliability and predictive capacity of sea-ice biogeochemical models.

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Letizia Tedesco, Giulia Castellani, Pedro Duarte, Meibing Jin, Sebastien Moreau, Eric Mortenson, Benjamin Tobey Saenz, Nadja Steiner, and Martin Vancoppenolle

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-1107', Anonymous Referee #1, 12 May 2025
    • AC1: 'Reply on RC1', Letizia Tedesco, 03 Jul 2025
  • RC2: 'Comment on egusphere-2025-1107', Anonymous Referee #2, 22 May 2025
    • AC2: 'Reply on RC2', Letizia Tedesco, 03 Jul 2025
Letizia Tedesco, Giulia Castellani, Pedro Duarte, Meibing Jin, Sebastien Moreau, Eric Mortenson, Benjamin Tobey Saenz, Nadja Steiner, and Martin Vancoppenolle
Letizia Tedesco, Giulia Castellani, Pedro Duarte, Meibing Jin, Sebastien Moreau, Eric Mortenson, Benjamin Tobey Saenz, Nadja Steiner, and Martin Vancoppenolle

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Short summary
Sea ice is home to tiny algae that support polar marine life, but understanding how they grow and interact with their environment remains challenging. We compared six computer models that simulate these algae and nutrients in sea ice, testing them against real-world data from Arctic sea ice. Our results show that while models can capture algal growth, they struggle to represent nutrient changes. Improving these models will help in understanding how climate change affects polar marine ecosystems.
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