Landfast Ice and Coastal Wave Exposure in Northern Alaska
Landfast Ice and Coastal Wave Exposure in Northern Alaska
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DOI：
10.1029/2021gl095103
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发表时间：
2021-11-28
影响因子：
5.2
通讯作者：
Thomson, Jim
中科院分区：
文献类型：
--
作者：
Hosekova, Lucia;Eidam, Emily;Thomson, Jim
在阿拉斯加北方海岸沿着的三个地点观测的海洋表面波显示出与季节性海冰模式的强相关性。在冬季，冰层覆盖完整，没有波浪。在春季和初夏，海冰区域性消退，但海岸附近的陆地坚冰持续存在。陆固冰完全减弱了在开阔水域形成的波浪，导致海岸附近波浪的发生延迟长达两个月。在秋季，陆固冰开始改革，虽然波衰减只是部分由于较低的冰厚度相比，春季。ERA5再分析产品再现了观测中的年循环，但该产品不能解决陆固冰。由此产生的ERA5偏差沿海波曝光可以通过应用更高分辨率的冰掩模进行校正，这对ERA5推断的长期趋势有显着的影响。
Observations of ocean surface waves at three sites along the northern coast of Alaska show a strong correlation with seasonal sea ice patterns. In the winter, ice cover is complete, and waves are absent. In the spring and early summer, sea ice retreats regionally, but landfast ice persists near the coast. The landfast ice completely attenuates waves formed farther offshore in the open water, causing up to a two-month delay in the onset of waves near shore. In autumn, landfast ice begins to reform, though the wave attenuation is only partial due to lower ice thickness compared to spring. The annual cycle in the observations is reproduced by the ERA5 reanalysis product, but the product does not resolve landfast ice. The resulting ERA5 bias in coastal wave exposure can be corrected by applying a higher-resolution ice mask, and this has a significant effect on the long-term trends inferred from ERA5.