Assessing the Spurious Impacts of Ice-Constraining Methods on the Climate Response to Sea-Ice Loss using an Idealised Aquaplanet GCM ...

• Main Authors: Lewis, Neil T., England, Mark R., Screen, James A., Geen, Ruth, Mudhar, Regan, Seviour, William J. M., Thomson, Stephen I.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: arXiv 2024
• Subjects: Atmospheric and Oceanic Physics physics.ao-ph; FOS Physical sciences; albedo; Arctic; Sea ice
• Online Access: https://dx.doi.org/10.48550/arxiv.2403.14304; https://arxiv.org/abs/2403.14304

Coupled climate model simulations designed to isolate the effects of Arctic sea-ice loss often apply artificial heating, either directly to the ice or through modification of the surface albedo, to constrain sea-ice in the absence of other forcings. Recent work has shown that this approach may lead to an overestimation of the climate response to sea-ice loss. In this study, we assess the spurious impacts of ice-constraining methods on the climate of an idealised aquaplanet general circulation model (GCM) with thermodynamic sea-ice. The true effect of sea-ice loss in this model is isolated by inducing ice loss through reduction of the freezing point of water, which does not require additional energy input. We compare results from freezing point modification experiments with experiments where sea-ice loss is induced using traditional ice-constraining methods, and confirm the result of previous work that traditional methods induce spurious additional warming. Furthermore, additional warming leads to an ... : Submitted to Journal of Climate ...