Canadian arctic buoy program

加拿大北极浮标计划

• 批准号: 331408-2008
• 负责人: Tremblay, Bruno
• 金额: $ 1.09万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Northern Research Supplement
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=515080
• 关键词: Canadian; arctic; buoy; program

The Canadian Arctic Archipelago (CAA) is expected to become navigable in the near future. Current estimates are based on simulation results from General Circulation Models (GCMs). The spatial resolution of GCMs, however, only allows for a coarse representation of the CAA. Higher resolution models are needed to better predict the future evolution of the sea ice in the CAA. Until now, sea-ice dynamic models have been calibrated against buoy drift data in the Arctic Ocean from the International Arctic Buoy Program (IABP), but no data is present for the CAA in IABP. Whether the calibration of these models (and the continuum assumption upon which they are based), are still valid at high resolution remain an open question. To address this, we make in-situ measurements within the narrow passages of the CAA. In particular, we monitor the temporal evolution of sea-ice deformations, internal stresses and thicknesses in the CAA. These measurements are used to calibrate/validate a high resolution sea-ice model that was recently developed in our group. The dynamical part of this model is solved using the Generalized Minimum Residual method (GMRES), with a line Successive Over-Relaxation preconditioner to allow for efficient long term integrations. This new implementation constitutes a significant improvement in numerical efficiency and allows for the integration of the model at high resolution over a domain including both the CAA and the Arctic Ocean. The first deployment took place successfully last October (2007) north of the M'Clintock Channel using ArcticNet logistics aboard the Amundsen ice breaker.

加拿大北极群岛（CAA）预计将在不久的将来成为通航。目前的估计数是根据大气环流模式的模拟结果作出的。然而，GCM的空间分辨率仅允许粗略表示CAA。需要更高分辨率的模式来更好地预测CAA中海冰的未来演变。到目前为止，海冰动力学模型已校准的浮标漂移数据在北冰洋从国际北极浮标计划（IABP），但没有数据的CAA在IABP。这些模型的校准（以及它们所基于的连续假设）在高分辨率下是否仍然有效仍然是一个悬而未决的问题。 为了解决这个问题，我们在CAA的狭窄通道内进行原位测量。特别是，我们监测海冰变形，内应力和厚度在CAA的时间演变。 这些测量用于校准/验证我们小组最近开发的高分辨率海冰模型。该模型的动力学部分使用广义最小残差法（GMRES）求解，并使用线性连续超松弛预条件子进行有效的长期积分。这一新的实现构成了数值效率的显着提高，并允许在包括CAA和北冰洋在内的域上以高分辨率集成模型。第一次部署于去年10月（2007年）在麦克林托克海峡以北成功进行，使用阿蒙森破冰船上的北极网物流。