冰盖风化壳演化的建模
Modelling the evolution of an ice sheet's weathering crust
AI总结：
本文通过数值焓法求解冰盖风化壳的热力学连续模型，研究其在理想化强迫下的增长与衰减动力学，揭示表面热通量的相对重要性，为理解其对气候变化的响应提供工具。
摘要：
风化壳是一层可在冰盖表面形成的多孔冰。它随着天气和气候条件的变化而增长和衰减，影响反照率、融化速率以及融水在表面的输送。为了理解这种行为，我们寻求一个连续介质热力学模型的时间相关解，该模型描述风化壳的孔隙度、温度和厚度，以及内部和表面融化速率。我们使用本研究中提出的数值焓法求解。我们利用理想化的“切换”和正弦强迫来探索增长和衰减过程中表现出的不同动力学、所涉及的时间尺度，以及日变化与年变化的影响。结果与观测结果定性一致，并深入揭示了在风化壳增长和衰减过程中不同表面热通量的相对重要性。因此，该模型为探索风化壳对气候变化的响应提供了一个有用的工具。
英文摘要：
The weathering crust is a layer of porous ice that can form at the surface of an ice sheet. It grows and decays in response changing weather and climate conditions, affecting the albedo, the melt rate, and the transport of meltwater across the surface. To understand this behaviour, we seek time-dependent solutions to a continuum, thermodynamic model for the porosity, temperature and thickness of the weathering crust, and the internal and surface melt rates. We find solutions using a numerical enthalpy method, presented in this study. We use idealised `switching' and sinusoidal forcings to explore the different dynamics exhibited during growth and decay, the timescales involved, and the impact of diurnal vs. annual variations. The results demonstrate qualitative agreement with observations, and provide insight into the relative importance of different surface heat fluxes during the growth and decay of the crust. The model therefore provides a useful tool for exploring the response of the weathering crust to climate change.
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