The Sapporo Glacier: a conceptual framework for urban cryosphere engineering and climate-responsive design

Urban snow management systems are typically treated as logistical operations to remove and dispose of excess snow. However, the Sapporo Glacier concept reframes municipal snow management within a cryospheric systems framework, transforming urban snow accumulation into a controlled cryospheric process that interacts with climate and urban energy systems. This paper presents a hypothesis-driven scoping concept, the Sapporo Glacier, as a conceptual framework for Urban Cryosphere Engineering, which seeks to design and control the long-term storage, insulation, and metamorphism of urban snow using bounded, first-order physical reasoning rather than site-calibrated performance prediction to create a glacier possessing glacier ice (as classically defined) and measurable flow. Using Sapporo City’s existing snow-depot infrastructure as a reference model, the framework integrates physical modeling (degree-day method and simplified energy-balance considerations), surface control through organic mulch, and seasonal monitoring to delineate feasible design regimes for optimizing the thermal state of accumulated snow. Beyond technical feasibility, it emphasizes socio-environmental integration, envisioning snow storage as both a climate-adaptive infrastructure and a cultural landscape that connects citizens to seasonal cycles. Importantly, meltwater released from such an urban glacier during summer may generate a localized, testable nearshore thermal signal, enabling empirical evaluation of coastal cryosphere–ocean interactions. This hypothesis-driven, conceptual approach aims to establish an interdisciplinary foundation for future empirical studies and design experiments, rather than to deliver predictive site-specific outcomes, toward the realization of urban glaciers as sustainable and ecological elements of city life.