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基于物理的参数化框架,用于冰洋边界层在动态稳定的火山岩上基础融化
T Jayasankar1,2, A Jenkins1
1University of Northumbria, Newcastle upon Tyne, UK.
概括
在海洋模型中,由于抑制的热传递,基本融化被高估了. 一个新的基于物理的框架改善了对冰盖稳定性和海平面上升的预测.
科学领域:
- 海洋学 海洋学 海洋学
- 冰川学的冰川学
- 气候科学 气候科学
背景情况:
- 准确的基底融化预测对于评估冰盖稳定性和海平面上升至关重要.
- 在Thwaites冰川的观测显示,尽管海洋水温暖,但融化速度很低,这归因于垂直混合和密度分层较弱.
- 海洋模型中的当前基底融化参数化在这种条件下高估了融化速率.
研究的目的:
- 在海洋模型中重新审视和改进基底融化参数化.
- 为了研究火烯分层对冰洋热量转移的影响.
- 开发一个更准确的基于物理的参数化框架.
主要方法:
- 将冰-海洋边界电流模型应用于水平冰基.
- 模拟了一个在动态稳定的pycnocline上边界层.
- 分析了不同电流速度下的热传递和融化速率预测.
主要成果:
- 烟素的低扩散性限制了热传输,导致模型中的融过度预测,特别是在较弱的电流下.
- 降低边界层深度可以减轻过度预测,但高速极限对于较慢的电流是一个更有效的解决方案.
- 拟议的基于物理的框架更好地模拟了观察到的冰洋相互作用.
结论:
- 标准的基底融化参数化需要根据分层海洋条件进行调整.
- 对于缓慢电流的场景,建议规定一个上速度极限.
- 开发的基于物理的框架为模拟基底融化及其对冰盖的影响提供了更准确的方法.
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